CNM

SEC source: 0001856525-24-000125 · wk-form4_1733439774.xml · nonDerivative · entry 1

Cowles Bradford A · CIK 0001866531 · President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 68,423

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: On December 3, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 50,000 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F2 · shares: On December 3, 2024, pursuant to the terms of the Fourth Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of February 13, 2024 (as amended, the "LLC Agreement"), 50,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 50,000 Paired Interests.

F3 · balance_after: Includes 18,423 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest on March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in two equal installments on March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 7, 2024 vest in three equal installments on March 7, 2025, March 7, 2026 and March 7, 2027, subject to the reporting person remaining employed with the Issuer through each vesting date.

SEC source: 0001856525-24-000126 · wk-form4_1733439785.xml · derivative · entry 7

Giles Jeffrey D · CIK 0001866555 · EVP, Corporate Department

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 22,259 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F8 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F8 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F4 · kind: On December 3, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 22,259 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock, on a one-for-one basis.

F4 · shares: On December 3, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 22,259 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock, on a one-for-one basis.

F8 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F8 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001856525-24-000126 · wk-form4_1733439785.xml · derivative · entry 6

Giles Jeffrey D · CIK 0001866555 · EVP, Corporate Department

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 22,259

Underlying: Class A Common Stock · 22,259 shares

Expires not disclosed

F8 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F8 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F5 · shares: On December 3, 2024, pursuant to the terms of the LLC Agreement, 22,259 Units held directly by the reporting person were redeemed at the discretion of the reporting person for 22,259 Paired Interests.

F8 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F8 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001856525-24-000126 · wk-form4_1733439785.xml · derivative · entry 5

Giles Jeffrey D · CIK 0001866555 · EVP, Corporate Department

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 0

Underlying: Class A Common Stock · 22,259 shares

Expires not disclosed

F8 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F9 · derivative.exercise_price: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F8 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F9 · date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F5 · shares: On December 3, 2024, pursuant to the terms of the LLC Agreement, 22,259 Units held directly by the reporting person were redeemed at the discretion of the reporting person for 22,259 Paired Interests.

F8 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F9 · derivative.exercise_date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F8 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F9 · derivative.expiration_date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F9 · ownership.direct: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

SEC source: 0001856525-24-000126 · wk-form4_1733439785.xml · nonDerivative · entry 4

Giles Jeffrey D · CIK 0001866555 · EVP, Corporate Department

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 11,615

F6 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 11, 2024.

F7 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $53.7900 to $55.6100 per share. The reporting person will provide to the Issuer, or the Securities and Exchange Commission staff, upon request, information regarding the number of shares sold at each price within the range.

F3 · balance_after: Includes 14,354 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest on March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in two equal installments on March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 7, 2024 vest in three equal installments on March 7, 2025, March 7, 2026 and March 7, 2027, subject to the reporting person remaining employed with the Issuer through each vesting date.

SEC source: 0001856525-24-000126 · wk-form4_1733439785.xml · nonDerivative · entry 3

Giles Jeffrey D · CIK 0001866555 · EVP, Corporate Department

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 36,615

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · kind: On December 3, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 22,259 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock, on a one-for-one basis.

F5 · shares: On December 3, 2024, pursuant to the terms of the LLC Agreement, 22,259 Units held directly by the reporting person were redeemed at the discretion of the reporting person for 22,259 Paired Interests.

F3 · balance_after: Includes 14,354 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest on March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in two equal installments on March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 7, 2024 vest in three equal installments on March 7, 2025, March 7, 2026 and March 7, 2027, subject to the reporting person remaining employed with the Issuer through each vesting date.

SEC source: 0001856525-24-000126 · wk-form4_1733439785.xml · nonDerivative · entry 2

Giles Jeffrey D · CIK 0001866555 · EVP, Corporate Department

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 14,356

F1 · shares: On December 3, 2024, pursuant to the terms of the Fourth Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of February 13, 2024 (as amended, the "LLC Agreement"), 2 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 2 shares of Class A common stock of the Issuer ("Class A common stock").

F3 · balance_after: Includes 14,354 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest on March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in two equal installments on March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 7, 2024 vest in three equal installments on March 7, 2025, March 7, 2026 and March 7, 2027, subject to the reporting person remaining employed with the Issuer through each vesting date.

SEC source: 0001856525-24-000126 · wk-form4_1733439785.xml · nonDerivative · entry 1

Giles Jeffrey D · CIK 0001866555 · EVP, Corporate Department

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 0

F1 · shares: On December 3, 2024, pursuant to the terms of the Fourth Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of February 13, 2024 (as amended, the "LLC Agreement"), 2 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 2 shares of Class A common stock of the Issuer ("Class A common stock").

F2 · ownership.direct: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for shares of Class A common stock, on a one-for-one basis.

SEC source: 0001856525-24-000124 · wk-form4_1733439763.xml · derivative · entry 7

NEWMAN MARGARET · CIK 0001579754 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 14,968 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F9 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F4 · shares: On December 3, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 14,968 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock, on a one-for-one basis.

F9 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F9 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001856525-24-000124 · wk-form4_1733439763.xml · derivative · entry 6

NEWMAN MARGARET · CIK 0001579754 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 14,968

Underlying: Class A Common Stock · 14,968 shares

Expires not disclosed

F9 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F5 · shares: On December 3, 2024, pursuant to the terms of the LLC Agreement, 14,968 Units held directly by the reporting person were redeemed at the discretion of the reporting person for 14,968 Paired Interests.

F9 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F9 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001856525-24-000124 · wk-form4_1733439763.xml · derivative · entry 5

NEWMAN MARGARET · CIK 0001579754 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 40,480

Underlying: Class A Common Stock · 14,968 shares

Expires not disclosed

F8 · derivative.exercise_price: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F9 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F5 · shares: On December 3, 2024, pursuant to the terms of the LLC Agreement, 14,968 Units held directly by the reporting person were redeemed at the discretion of the reporting person for 14,968 Paired Interests.

F8 · derivative.exercise_date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F9 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F8 · derivative.expiration_date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F9 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F8 · ownership.direct: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

SEC source: 0001856525-24-000124 · wk-form4_1733439763.xml · nonDerivative · entry 4

NEWMAN MARGARET · CIK 0001579754 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 11,769

F6 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 28, 2024.

F7 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $54.9600 to $55.6650 per share. The reporting person will provide to the Issuer, or the Securities and Exchange Commission staff, upon request, information regarding the number of shares sold at each price within the range.

F3 · balance_after: Includes 11,769 restricted stock units ("RSUs") granted to the reporting person as director compensation. 9,320 RSUs have vested as of the date of this Form 4. 2,449 RSUs will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of shareholders to be held in 2025 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

SEC source: 0001856525-24-000124 · wk-form4_1733439763.xml · nonDerivative · entry 3

NEWMAN MARGARET · CIK 0001579754 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 26,769

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · kind: On December 3, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 14,968 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock, on a one-for-one basis.

F5 · shares: On December 3, 2024, pursuant to the terms of the LLC Agreement, 14,968 Units held directly by the reporting person were redeemed at the discretion of the reporting person for 14,968 Paired Interests.

F3 · balance_after: Includes 11,769 restricted stock units ("RSUs") granted to the reporting person as director compensation. 9,320 RSUs have vested as of the date of this Form 4. 2,449 RSUs will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of shareholders to be held in 2025 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

SEC source: 0001856525-24-000124 · wk-form4_1733439763.xml · nonDerivative · entry 2

NEWMAN MARGARET · CIK 0001579754 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 11,801

F1 · shares: On December 3, 2024, pursuant to the terms of the Fourth Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of February 13, 2024 (as amended, the "LLC Agreement"), 32 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 32 shares of Class A common stock of the Issuer ("Class A common stock").

F3 · balance_after: Includes 11,769 restricted stock units ("RSUs") granted to the reporting person as director compensation. 9,320 RSUs have vested as of the date of this Form 4. 2,449 RSUs will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of shareholders to be held in 2025 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

SEC source: 0001856525-24-000124 · wk-form4_1733439763.xml · nonDerivative · entry 1

NEWMAN MARGARET · CIK 0001579754 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 0

F1 · shares: On December 3, 2024, pursuant to the terms of the Fourth Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of February 13, 2024 (as amended, the "LLC Agreement"), 32 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 32 shares of Class A common stock of the Issuer ("Class A common stock").

F2 · ownership.nature: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for shares of Class A common stock, on a one-for-one basis.

SEC source: 0001856525-24-000123 · wk-form4_1733439752.xml · derivative · entry 5

LeClair Stephen O · CIK 0001659312 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 200,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F6 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F6 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F1 · kind: On December 3, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 200,000 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F1 · shares: On December 3, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 200,000 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F6 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F6 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001856525-24-000123 · wk-form4_1733439752.xml · derivative · entry 4

LeClair Stephen O · CIK 0001659312 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 200,000

Underlying: Class A Common Stock · 200,000 shares

Expires not disclosed

F6 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F6 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F2 · shares: On December 3, 2024, pursuant to the terms of the Fourth Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of February 13, 2024 (as amended, the "LLC Agreement"), 200,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 200,000 Paired Interests.

F6 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F6 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001856525-24-000123 · wk-form4_1733439752.xml · derivative · entry 3

LeClair Stephen O · CIK 0001659312 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 1,772,945

Underlying: Class A Common Stock · 200,000 shares

Expires not disclosed

F6 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F7 · derivative.exercise_price: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F6 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F7 · date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F2 · shares: On December 3, 2024, pursuant to the terms of the Fourth Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of February 13, 2024 (as amended, the "LLC Agreement"), 200,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 200,000 Paired Interests.

F6 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F7 · derivative.exercise_date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F6 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F7 · derivative.expiration_date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F7 · ownership.direct: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

SEC source: 0001856525-24-000123 · wk-form4_1733439752.xml · nonDerivative · entry 2

LeClair Stephen O · CIK 0001659312 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 92,349

F4 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 11, 2024.

F5 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $53.2700 to $55.9600 per share. The reporting person will provide to the Issuer, or the Securities and Exchange Commission staff, upon request, information regarding the number of shares sold at each price within the range.

F3 · balance_after: Includes 92,349 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest on March 11, 2025, subject to the terms of the associated Participant Restricted Stock Unit Agreement. The RSUs granted on March 10, 2023 vest in two equal installments on March 10, 2025 and March 10, 2026, subject to the terms of the associated Participant Restricted Stock Unit Agreement. The RSUs granted on March 7, 2024 vest in three equal installments on March 7, 2025, March 7, 2026 and March 7, 2027, subject to the terms of the associated Participant Restricted Stock Unit Agreement.

SEC source: 0001856525-24-000123 · wk-form4_1733439752.xml · nonDerivative · entry 1

LeClair Stephen O · CIK 0001659312 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 292,349

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: On December 3, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 200,000 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F2 · shares: On December 3, 2024, pursuant to the terms of the Fourth Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of February 13, 2024 (as amended, the "LLC Agreement"), 200,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 200,000 Paired Interests.

F3 · balance_after: Includes 92,349 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest on March 11, 2025, subject to the terms of the associated Participant Restricted Stock Unit Agreement. The RSUs granted on March 10, 2023 vest in two equal installments on March 10, 2025 and March 10, 2026, subject to the terms of the associated Participant Restricted Stock Unit Agreement. The RSUs granted on March 7, 2024 vest in three equal installments on March 7, 2025, March 7, 2026 and March 7, 2027, subject to the terms of the associated Participant Restricted Stock Unit Agreement.

SEC source: 0001856525-24-000113 · wk-form4_1728603974.xml · derivative · entry 2

Giles Jeffrey D · CIK 0001866555 · EVP, Corporate Department

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 232,928

Underlying: Class A Common Stock · 232,928 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 232,928 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on October 8, 2024 (the "Effective Date"). Pursuant to the Third Amended and Restated LLC Agreement of Management Feeder, dated as of July 22, 2021 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F2 · derivative.exercise_price: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F1 · date: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 232,928 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on October 8, 2024 (the "Effective Date"). Pursuant to the Third Amended and Restated LLC Agreement of Management Feeder, dated as of July 22, 2021 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F2 · date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F3 · shares: On the Effective Date, the reporting person transferred and assigned the Transferred Units to the Trust.

F1 · derivative.exercise_date: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 232,928 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on October 8, 2024 (the "Effective Date"). Pursuant to the Third Amended and Restated LLC Agreement of Management Feeder, dated as of July 22, 2021 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F2 · derivative.exercise_date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F1 · derivative.expiration_date: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 232,928 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on October 8, 2024 (the "Effective Date"). Pursuant to the Third Amended and Restated LLC Agreement of Management Feeder, dated as of July 22, 2021 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F2 · derivative.expiration_date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F1 · ownership.direct: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 232,928 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on October 8, 2024 (the "Effective Date"). Pursuant to the Third Amended and Restated LLC Agreement of Management Feeder, dated as of July 22, 2021 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

SEC source: 0001856525-24-000113 · wk-form4_1728603974.xml · derivative · entry 1

Giles Jeffrey D · CIK 0001866555 · EVP, Corporate Department

10b5-1 filing: No plan indicated

Ownership: Indirect · By LLC

Disclosed balance after: 22,259

Underlying: Class A Common Stock · 232,928 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 232,928 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on October 8, 2024 (the "Effective Date"). Pursuant to the Third Amended and Restated LLC Agreement of Management Feeder, dated as of July 22, 2021 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F2 · derivative.exercise_price: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F1 · date: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 232,928 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on October 8, 2024 (the "Effective Date"). Pursuant to the Third Amended and Restated LLC Agreement of Management Feeder, dated as of July 22, 2021 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F2 · date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F3 · shares: On the Effective Date, the reporting person transferred and assigned the Transferred Units to the Trust.

F1 · derivative.exercise_date: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 232,928 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on October 8, 2024 (the "Effective Date"). Pursuant to the Third Amended and Restated LLC Agreement of Management Feeder, dated as of July 22, 2021 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F2 · derivative.exercise_date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F1 · derivative.expiration_date: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 232,928 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on October 8, 2024 (the "Effective Date"). Pursuant to the Third Amended and Restated LLC Agreement of Management Feeder, dated as of July 22, 2021 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F2 · derivative.expiration_date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F1 · ownership.direct: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 232,928 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on October 8, 2024 (the "Effective Date"). Pursuant to the Third Amended and Restated LLC Agreement of Management Feeder, dated as of July 22, 2021 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

SEC source: 0001856525-24-000105 · wk-form4_1721855683.xml · derivative · entry 4

HUEBERT MICHAEL G. · CIK 0001823429 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,100

Underlying: Class A Common Stock · 25,100 shares

Expires 2034-07-22

F4 · derivative.exercise_date: The options vest in two equal installments on July 22, 2025 and July 22, 2026, subject to the terms of the associated Participant Stock Option Agreement.

SEC source: 0001856525-24-000105 · wk-form4_1721855683.xml · derivative · entry 3

HUEBERT MICHAEL G. · CIK 0001823429 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,416

Underlying: Class A Common Stock · 25,416 shares

Expires 2034-03-07

F3 · derivative.exercise_date: The options vest in three equal installments on March 7, 2025, March 7, 2026 and March 7, 2027, subject to the terms of the associated Participant Stock Option Agreement.

SEC source: 0001856525-24-000105 · wk-form4_1721855683.xml · nonDerivative · entry 2

HUEBERT MICHAEL G. · CIK 0001823429 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,836

F2 · shares: Represents RSUs granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in two equal annual installments on July 22, 2025 and July 22, 2026, subject to the terms of the associated Participant Restricted Stock Unit Agreement.

SEC source: 0001856525-24-000105 · wk-form4_1721855683.xml · nonDerivative · entry 1

HUEBERT MICHAEL G. · CIK 0001823429 · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,240

F1 · shares: Represents restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock of the Issuer ("Class A common stock"). The RSUs vest in three equal annual installments on March 7, 2025, March 7, 2026 and March 7, 2027, subject to the terms of the associated Participant Restricted Stock Unit Agreement.

SEC source: 0001856525-24-000101 · wk-form4_1721335974.xml · derivative · entry 8

Gipson Dennis G · CIK 0001866536 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 0

Underlying: Class A Common Stock · 24,857 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F10 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuers board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuers board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F4 · kind: On July 16, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 24,857 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock, on a one-for-one basis.

F4 · shares: On July 16, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 24,857 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock, on a one-for-one basis.

F10 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuers board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuers board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F3 · ownership.direct: Represents securities held indirectly by the reporting person through the Trust.

SEC source: 0001856525-24-000101 · wk-form4_1721335974.xml · derivative · entry 7

Gipson Dennis G · CIK 0001866536 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 24,857

Underlying: Class A Common Stock · 24,857 shares

Expires not disclosed

F10 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuers board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuers board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F5 · shares: On July 16, 2024, pursuant to the terms of the LLC Agreement, 24,857 vested Units held indirectly by the reporting person through the Trust were redeemed at the discretion of the Trust for 24,857 Paired Interests.

F10 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuers board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuers board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F3 · ownership.direct: Represents securities held indirectly by the reporting person through the Trust.

SEC source: 0001856525-24-000101 · wk-form4_1721335974.xml · derivative · entry 6

Gipson Dennis G · CIK 0001866536 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 219,601

Underlying: Class A Common Stock · 24,857 shares

Expires not disclosed

F9 · derivative.exercise_price: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F10 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuers board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F9 · date: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F10 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuers board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F5 · shares: On July 16, 2024, pursuant to the terms of the LLC Agreement, 24,857 vested Units held indirectly by the reporting person through the Trust were redeemed at the discretion of the Trust for 24,857 Paired Interests.

F9 · derivative.exercise_date: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F10 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuers board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F9 · derivative.expiration_date: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F10 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuers board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F9 · ownership.direct: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

SEC source: 0001856525-24-000101 · wk-form4_1721335974.xml · nonDerivative · entry 4

Gipson Dennis G · CIK 0001866536 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 0

F6 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Trust on April 1, 2024.

F7 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $53.0000 to $53.3700 per share. The reporting person will provide to the Issuer, or the Securities and Exchange Commission staff, upon request, information regarding the number of shares sold at each price within the range.

F3 · ownership.direct: Represents securities held indirectly by the reporting person through the Trust.

SEC source: 0001856525-24-000101 · wk-form4_1721335974.xml · nonDerivative · entry 3

Gipson Dennis G · CIK 0001866536 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 25,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · kind: On July 16, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 24,857 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock, on a one-for-one basis.

F5 · shares: On July 16, 2024, pursuant to the terms of the LLC Agreement, 24,857 vested Units held indirectly by the reporting person through the Trust were redeemed at the discretion of the Trust for 24,857 Paired Interests.

F3 · ownership.direct: Represents securities held indirectly by the reporting person through the Trust.

SEC source: 0001856525-24-000101 · wk-form4_1721335974.xml · nonDerivative · entry 2

Gipson Dennis G · CIK 0001866536 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 143

F1 · shares: On July 16, 2024, pursuant to the terms of the Fourth Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of February 13, 2024 (as amended, the "LLC Agreement"), 143 vested common units ("Units") held indirectly by the reporting person through the Irrevocable Trust FBO D. G. Gipson (the "Trust") were redeemed at the discretion of the Trust for 143 shares of Class A common stock of the Issuer ("Class A common stock").

F3 · ownership.direct: Represents securities held indirectly by the reporting person through the Trust.

SEC source: 0001856525-24-000101 · wk-form4_1721335974.xml · nonDerivative · entry 1

Gipson Dennis G · CIK 0001866536 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 0

F1 · shares: On July 16, 2024, pursuant to the terms of the Fourth Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of February 13, 2024 (as amended, the "LLC Agreement"), 143 vested common units ("Units") held indirectly by the reporting person through the Irrevocable Trust FBO D. G. Gipson (the "Trust") were redeemed at the discretion of the Trust for 143 shares of Class A common stock of the Issuer ("Class A common stock").

F2 · ownership.direct: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for shares of Class A common stock, on a one-for-one basis.

SEC source: 0001856525-24-000099 · wk-form4_1721247499.xml · derivative · entry 6

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 0

Underlying: Class A Common Stock · 12,500 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F7 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F7 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F1 · kind: On July 15, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 12,500 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F1 · shares: On July 15, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 12,500 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F7 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F7 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001856525-24-000099 · wk-form4_1721247499.xml · derivative · entry 5

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 12,500

Underlying: Class A Common Stock · 12,500 shares

Expires not disclosed

F7 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F7 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F2 · shares: On July 15, 2024, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 12,500 vested common units ("Units") held indirectly by the reporting person through the James G. Castellano 2021 Family Trust (the "Trust") were redeemed at the discretion of the Trust for 12,500 Paired Interests.

F7 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F7 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001856525-24-000099 · wk-form4_1721247499.xml · derivative · entry 4

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 193,620

Underlying: Class A Common Stock · 12,500 shares

Expires not disclosed

F7 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F8 · derivative.exercise_price: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F7 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F8 · date: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F2 · shares: On July 15, 2024, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 12,500 vested common units ("Units") held indirectly by the reporting person through the James G. Castellano 2021 Family Trust (the "Trust") were redeemed at the discretion of the Trust for 12,500 Paired Interests.

F7 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F8 · derivative.exercise_date: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F7 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F8 · derivative.expiration_date: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F8 · ownership.direct: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

SEC source: 0001856525-24-000099 · wk-form4_1721247499.xml · nonDerivative · entry 2

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 0

F4 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Trust on March 28, 2024.

F5 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $52.0000 to $52.3500 per share. The reporting person will provide to the Issuer, or the Securities and Exchange Commission staff, upon request, information regarding the number of shares sold at each price within the range.

F3 · ownership.direct: Represents securities held indirectly by the reporting person through the Trust.

SEC source: 0001856525-24-000099 · wk-form4_1721247499.xml · nonDerivative · entry 1

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 12,500

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: On July 15, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 12,500 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F2 · shares: On July 15, 2024, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 12,500 vested common units ("Units") held indirectly by the reporting person through the James G. Castellano 2021 Family Trust (the "Trust") were redeemed at the discretion of the Trust for 12,500 Paired Interests.

F3 · ownership.direct: Represents securities held indirectly by the reporting person through the Trust.

SEC source: 0001856525-24-000097 · wk-form4_1720816669.xml · derivative · entry 11

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 0

Underlying: Class A Common Stock · 12,300 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F10 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F6 · kind: On July 11, 2024, pursuant to the terms of the Exchange Agreement, 12,300 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F6 · shares: On July 11, 2024, pursuant to the terms of the Exchange Agreement, 12,300 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F10 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001856525-24-000097 · wk-form4_1720816669.xml · derivative · entry 10

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 12,300

Underlying: Class A Common Stock · 12,300 shares

Expires not disclosed

F10 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F7 · shares: On July 11, 2024, pursuant to the terms of the LLC Agreement, 12,300 vested Units held indirectly by the reporting person through the Trust were redeemed at the discretion of the Trust for 12,300 Paired Interests.

F10 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001856525-24-000097 · wk-form4_1720816669.xml · derivative · entry 9

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 206,120

Underlying: Class A Common Stock · 12,300 shares

Expires not disclosed

F10 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · derivative.exercise_price: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F10 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · date: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F7 · shares: On July 11, 2024, pursuant to the terms of the LLC Agreement, 12,300 vested Units held indirectly by the reporting person through the Trust were redeemed at the discretion of the Trust for 12,300 Paired Interests.

F10 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · derivative.exercise_date: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F10 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · derivative.expiration_date: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F11 · ownership.direct: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

SEC source: 0001856525-24-000097 · wk-form4_1720816669.xml · nonDerivative · entry 4

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 0

F4 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Trust on March 28, 2024.

F8 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $50.0500 to $51.1600 per share. The reporting person will provide to the Issuer, or the Securities and Exchange Commission staff, upon request, information regarding the number of shares sold at each price within the range.

F3 · ownership.direct: Represents securities held indirectly by the reporting person through the Trust.

SEC source: 0001856525-24-000097 · wk-form4_1720816669.xml · nonDerivative · entry 3

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 12,300

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F6 · kind: On July 11, 2024, pursuant to the terms of the Exchange Agreement, 12,300 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F7 · shares: On July 11, 2024, pursuant to the terms of the LLC Agreement, 12,300 vested Units held indirectly by the reporting person through the Trust were redeemed at the discretion of the Trust for 12,300 Paired Interests.

F3 · ownership.direct: Represents securities held indirectly by the reporting person through the Trust.

SEC source: 0001856525-24-000097 · wk-form4_1720816669.xml · derivative · entry 8

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 0

Underlying: Class A Common Stock · 200 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F10 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F1 · kind: On July 10, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 200 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F1 · shares: On July 10, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 200 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F10 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001856525-24-000097 · wk-form4_1720816669.xml · derivative · entry 7

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 200

Underlying: Class A Common Stock · 200 shares

Expires not disclosed

F10 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F2 · shares: On July 10, 2024, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 200 vested common units ("Units") held indirectly by the reporting person through the James G. Castellano 2021 Family Trust (the "Trust") were redeemed at the discretion of the Trust for 200 Paired Interests.

F10 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001856525-24-000097 · wk-form4_1720816669.xml · derivative · entry 6

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 218,420

Underlying: Class A Common Stock · 200 shares

Expires not disclosed

F10 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · derivative.exercise_price: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F10 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · date: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F2 · shares: On July 10, 2024, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 200 vested common units ("Units") held indirectly by the reporting person through the James G. Castellano 2021 Family Trust (the "Trust") were redeemed at the discretion of the Trust for 200 Paired Interests.

F10 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · derivative.exercise_date: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F10 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · derivative.expiration_date: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

F11 · ownership.direct: Represents securities held by Management Feeder in respect of Units held indirectly by the reporting person through the Trust. Pursuant to the LLC Agreement, such vested Units held by the Trust are redeemable at the discretion of the Trust for Paired Interests, on a one-for-one basis.

SEC source: 0001856525-24-000097 · wk-form4_1720816669.xml · nonDerivative · entry 2

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 0

F4 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Trust on March 28, 2024.

F5 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $50.0000 to $50.0200 per share. The reporting person will provide to the Issuer, or the Securities and Exchange Commission staff, upon request, information regarding the number of shares sold at each price within the range.

F3 · ownership.direct: Represents securities held indirectly by the reporting person through the Trust.

SEC source: 0001856525-24-000097 · wk-form4_1720816669.xml · nonDerivative · entry 1

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 200

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: On July 10, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 200 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F2 · shares: On July 10, 2024, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 200 vested common units ("Units") held indirectly by the reporting person through the James G. Castellano 2021 Family Trust (the "Trust") were redeemed at the discretion of the Trust for 200 Paired Interests.

F3 · ownership.direct: Represents securities held indirectly by the reporting person through the Trust.

SEC source: 0001856525-24-000090 · wk-form4_1719609802.xml · nonDerivative · entry 1

Gipson Dennis G · CIK 0001866536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,769

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of shareholders to be held in 2025 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

F2 · balance_after: Includes RSUs previously granted to the reporting person.

SEC source: 0001856525-24-000085 · wk-form4_1719609748.xml · nonDerivative · entry 1

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,769

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of shareholders to be held in 2025 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

F2 · balance_after: Includes RSUs previously granted to the reporting person.