CNM

SEC source: 0001209191-23-018662 · doc4.xml · derivative · entry 3

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 33,501

Underlying: Class A Common Stock · 33,501 shares

Expires 2033-03-10

F4 · derivative.exercise_date: The options vest in three equal installments on March 10, 2024, March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-23-018662 · doc4.xml · nonDerivative · entry 1

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,217

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 10, 2024, March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date.

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

SEC source: 0001209191-23-018665 · doc4.xml · derivative · entry 3

Schaller John R · CIK 0001866571 · President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 65,604

Underlying: Class A Common Stock · 65,604 shares

Expires 2033-03-10

F4 · derivative.exercise_date: The options vest in three equal installments on March 10, 2024, March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-23-018665 · doc4.xml · nonDerivative · entry 1

Schaller John R · CIK 0001866571 · President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,903

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 10, 2024, March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date.

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

SEC source: 0001209191-23-018667 · doc4.xml · derivative · entry 2

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 39,549

Underlying: Class A Common Stock · 39,549 shares

Expires 2033-03-10

F3 · derivative.exercise_date: The options vest in three equal installments on March 10, 2024, March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-23-018667 · doc4.xml · nonDerivative · entry 1

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,672

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 10, 2024, March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date.

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

SEC source: 0001209191-23-018663 · doc4.xml · derivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 312,309

Underlying: Class A Common Stock · 312,309 shares

Expires 2033-03-10

F4 · derivative.exercise_date: The options vest in three equal installments on March 10, 2024, March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-23-018663 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 73,692

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 10, 2024, March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date.

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

SEC source: 0001209191-23-018672 · doc4.xml · derivative · entry 3

Witkowski Mark R · CIK 0001866738 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 79,560

Underlying: Class A Common Stock · 79,560 shares

Expires 2033-03-10

F4 · derivative.exercise_date: The options vest in three equal installments on March 10, 2024, March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-23-018672 · doc4.xml · nonDerivative · entry 1

Witkowski Mark R · CIK 0001866738 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,221

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 10, 2024, March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date.

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

SEC source: 0001209191-23-018671 · doc4.xml · derivative · entry 3

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,993

Underlying: Class A Common Stock · 42,993 shares

Expires 2033-03-10

F4 · derivative.exercise_date: The options vest in three equal installments on March 10, 2024, March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-23-018671 · doc4.xml · nonDerivative · entry 1

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,512

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 10, 2024, March 10, 2025 and March 10, 2026, subject to the reporting person remaining employed with the Issuer through each vesting date.

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

SEC source: 0001209191-23-016938 · doc4.xml · derivative · entry 7

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 66,667 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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: 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 March 3, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 66,667 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 March 3, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 66,667 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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: 0001209191-23-016938 · doc4.xml · derivative · entry 6

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 66,667

Underlying: Class A Common Stock · 66,667 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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: 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 March 3, 2023, pursuant to the terms of the LLC Agreement, 66,667 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 66,667 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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: 0001209191-23-016938 · doc4.xml · derivative · entry 5

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 868,832

Underlying: Class A Common Stock · 66,667 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 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 · 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 March 3, 2023, pursuant to the terms of the LLC Agreement, 66,667 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 66,667 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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: 0001209191-23-016938 · doc4.xml · nonDerivative · entry 4

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,866

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 January 13, 2023.

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 $24.00 to $24.12 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 4,866 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 RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-23-016938 · doc4.xml · nonDerivative · entry 3

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 71,629

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 March 3, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 66,667 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 March 3, 2023, pursuant to the terms of the LLC Agreement, 66,667 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 66,667 Paired Interests.

F3 · balance_after: Includes 4,866 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 RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-23-016938 · doc4.xml · nonDerivative · entry 2

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,962

F1 · shares: On March 3, 2023, 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"), 96 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 96 shares of Class A common stock of the Issuer ("Class A common stock").

F3 · balance_after: Includes 4,866 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 RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-23-016938 · doc4.xml · nonDerivative · entry 1

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 0

F1 · shares: On March 3, 2023, 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"), 96 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 96 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: 0001209191-23-016939 · doc4.xml · derivative · entry 6

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 31,204 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.

F1 · kind: On March 3, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 31,204 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 March 3, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 31,204 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.

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: 0001209191-23-016939 · doc4.xml · derivative · entry 5

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,204

Underlying: Class A Common Stock · 31,204 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.

F2 · shares: On March 3, 2023, 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"), 31,204 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 31,204 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: 0001209191-23-016939 · doc4.xml · derivative · entry 4

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 530,408

Underlying: Class A Common Stock · 31,204 shares

Expires not disclosed

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.

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.

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.

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.

F2 · shares: On March 3, 2023, 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"), 31,204 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 31,204 Paired Interests.

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.

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.

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.

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.

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: 0001209191-23-016939 · doc4.xml · nonDerivative · entry 2

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,286

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 January 12, 2023.

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 $24.00 to $24.06 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 5,286 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 RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-23-016939 · doc4.xml · nonDerivative · entry 1

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,490

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 March 3, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 31,204 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 March 3, 2023, 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"), 31,204 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 31,204 Paired Interests.

F3 · balance_after: Includes 5,286 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 RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-23-013925 · doc4.xml · derivative · entry 6

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 24,793 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.

F1 · kind: On February 24, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 24,793 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 February 24, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 24,793 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.

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: 0001209191-23-013925 · doc4.xml · derivative · entry 5

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,793

Underlying: Class A Common Stock · 24,793 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.

F2 · shares: On February 24, 2023, 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"), 24,793 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 24,793 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: 0001209191-23-013925 · doc4.xml · derivative · entry 4

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 561,612

Underlying: Class A Common Stock · 24,793 shares

Expires not disclosed

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.

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.

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.

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.

F2 · shares: On February 24, 2023, 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"), 24,793 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 24,793 Paired Interests.

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.

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.

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.

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.

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: 0001209191-23-013925 · doc4.xml · nonDerivative · entry 2

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,286

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 January 12, 2023.

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 $23.00 to $23.12 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 5,286 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 RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date.

SEC source: 0001209191-23-013925 · doc4.xml · nonDerivative · entry 1

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,079

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 February 24, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 24,793 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 February 24, 2023, 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"), 24,793 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 24,793 Paired Interests.

F3 · balance_after: Includes 5,286 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 RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date.

SEC source: 0001209191-23-011885 · doc4.xml · derivative · entry 6

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 6,411 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.

F1 · kind: On February 17, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 6,411 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 February 17, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 6,411 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.

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: 0001209191-23-011885 · doc4.xml · derivative · entry 5

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,411

Underlying: Class A Common Stock · 6,411 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.

F2 · shares: On February 17, 2023, 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"), 6,411 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 6,411 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: 0001209191-23-011885 · doc4.xml · derivative · entry 4

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 586,405

Underlying: Class A Common Stock · 6,411 shares

Expires not disclosed

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.

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.

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.

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.

F2 · shares: On February 17, 2023, 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"), 6,411 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 6,411 Paired Interests.

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.

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.

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.

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.

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: 0001209191-23-011885 · doc4.xml · nonDerivative · entry 2

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,286

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 January 12, 2023.

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 $23.00 to $23.16. 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 5,286 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 RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date.

SEC source: 0001209191-23-011885 · doc4.xml · nonDerivative · entry 1

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,697

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 February 17, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 6,411 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 February 17, 2023, 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"), 6,411 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 6,411 Paired Interests.

F3 · balance_after: Includes 5,286 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 RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date.

SEC source: 0001209191-22-050942 · doc4.xml · derivative · entry 6

CD&R Investment Associates X, Ltd. · CIK 0001759120 · 10% owner

CD&R Fund X Waterworks B1, L.P. · CIK 0001871836 · 10% owner

CD&R Fund X-A Waterworks B, L.P. · CIK 0001871835 · 10% owner

CD&R Waterworks Holdings, L.P. · CIK 0001871833 · 10% owner

CD&R Waterworks Holdings GP, Ltd. · CIK 0001871834 · 10% owner

CD&R Fund X Advisor Waterworks B, L.P. · CIK 0001871837 · 10% owner

CD&R Waterworks Holdings, LLC · CIK 0001874292 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Affiliate

Disclosed balance after: 60,275,374

Underlying: Class A Common Stock · 4,123,399 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, Partnership Interests, together with the retirement of a corresponding number of shares of Class B common stock of the Issuer, held by the reporting person are exchangeable at the discretion of the reporting person for shares of the Issuer's 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 the Issuer's Class A common stock sold in such public offering or private sale), net of any underwriting discounts and commissions, for each partnership interest exchanged, subject to certain exceptions, conditions and adjustments, and have no expiration date.

F5 · kind: On September 19, 2022, 4,123,399 limited partner interests of Core & Main Holdings, LP ("Partnership Interests") held directly by the reporting person, together with the retirement of a corresponding number of shares of Class B common stock of the Issuer, were exchanged for shares of Class A common stock of the Issuer on a one-for-one basis pursuant to an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement").

F8 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Partnership Interests, together with the retirement of a corresponding number of shares of Class B common stock of the Issuer, held by the reporting person are exchangeable at the discretion of the reporting person for shares of the Issuer's 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 the Issuer's Class A common stock sold in such public offering or private sale), net of any underwriting discounts and commissions, for each partnership interest exchanged, subject to certain exceptions, conditions and adjustments, and have no expiration date.

F8 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Partnership Interests, together with the retirement of a corresponding number of shares of Class B common stock of the Issuer, held by the reporting person are exchangeable at the discretion of the reporting person for shares of the Issuer's 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 the Issuer's Class A common stock sold in such public offering or private sale), net of any underwriting discounts and commissions, for each partnership interest exchanged, subject to certain exceptions, conditions and adjustments, and have no expiration date.

F6 · ownership.direct: Represents securities held by CD&R Waterworks Holdings, LLC ("Waterworks Holdings").

F7 · ownership.direct: CD&R Waterworks Holdings, L.P. ("Waterworks Holdings, L.P."), as the sole member and manager of Waterworks Holdings, CD&R Waterworks Holdings GP, as the general partner of Waterworks Holdings, L.P., CD&R Associates X, as the sole shareholder of CD&R Waterworks Holdings GP, and CD&R Investment Associates, as the general partner of CD&R Associates X, may be deemed to beneficially own the securities held by Waterworks Holdings. Each of Waterworks Holdings, L.P., CD&R Waterworks Holdings GP, CD&R Associates X and CD&R Investment Associates expressly disclaims beneficial ownership of the securities held by Waterworks Holdings, except to the extent of its pecuniary interest therein.

SEC source: 0001209191-22-050942 · doc4.xml · nonDerivative · entry 5

CD&R Investment Associates X, Ltd. · CIK 0001759120 · 10% owner

CD&R Fund X Waterworks B1, L.P. · CIK 0001871836 · 10% owner

CD&R Fund X-A Waterworks B, L.P. · CIK 0001871835 · 10% owner

CD&R Waterworks Holdings, L.P. · CIK 0001871833 · 10% owner

CD&R Waterworks Holdings GP, Ltd. · CIK 0001871834 · 10% owner

CD&R Fund X Advisor Waterworks B, L.P. · CIK 0001871837 · 10% owner

CD&R Waterworks Holdings, LLC · CIK 0001874292 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Affiliate

Disclosed balance after: 0

F6 · ownership.direct: Represents securities held by CD&R Waterworks Holdings, LLC ("Waterworks Holdings").

F7 · ownership.direct: CD&R Waterworks Holdings, L.P. ("Waterworks Holdings, L.P."), as the sole member and manager of Waterworks Holdings, CD&R Waterworks Holdings GP, as the general partner of Waterworks Holdings, L.P., CD&R Associates X, as the sole shareholder of CD&R Waterworks Holdings GP, and CD&R Investment Associates, as the general partner of CD&R Associates X, may be deemed to beneficially own the securities held by Waterworks Holdings. Each of Waterworks Holdings, L.P., CD&R Waterworks Holdings GP, CD&R Associates X and CD&R Investment Associates expressly disclaims beneficial ownership of the securities held by Waterworks Holdings, except to the extent of its pecuniary interest therein.

SEC source: 0001209191-22-050942 · doc4.xml · nonDerivative · entry 4

CD&R Investment Associates X, Ltd. · CIK 0001759120 · 10% owner

CD&R Fund X Waterworks B1, L.P. · CIK 0001871836 · 10% owner

CD&R Fund X-A Waterworks B, L.P. · CIK 0001871835 · 10% owner

CD&R Waterworks Holdings, L.P. · CIK 0001871833 · 10% owner

CD&R Waterworks Holdings GP, Ltd. · CIK 0001871834 · 10% owner

CD&R Fund X Advisor Waterworks B, L.P. · CIK 0001871837 · 10% owner

CD&R Waterworks Holdings, LLC · CIK 0001874292 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Affiliate

Disclosed balance after: 4,123,399

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.

F5 · kind: On September 19, 2022, 4,123,399 limited partner interests of Core & Main Holdings, LP ("Partnership Interests") held directly by the reporting person, together with the retirement of a corresponding number of shares of Class B common stock of the Issuer, were exchanged for shares of Class A common stock of the Issuer on a one-for-one basis pursuant to an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement").

F6 · ownership.direct: Represents securities held by CD&R Waterworks Holdings, LLC ("Waterworks Holdings").

F7 · ownership.direct: CD&R Waterworks Holdings, L.P. ("Waterworks Holdings, L.P."), as the sole member and manager of Waterworks Holdings, CD&R Waterworks Holdings GP, as the general partner of Waterworks Holdings, L.P., CD&R Associates X, as the sole shareholder of CD&R Waterworks Holdings GP, and CD&R Investment Associates, as the general partner of CD&R Associates X, may be deemed to beneficially own the securities held by Waterworks Holdings. Each of Waterworks Holdings, L.P., CD&R Waterworks Holdings GP, CD&R Associates X and CD&R Investment Associates expressly disclaims beneficial ownership of the securities held by Waterworks Holdings, except to the extent of its pecuniary interest therein.

SEC source: 0001209191-22-050942 · doc4.xml · nonDerivative · entry 3

CD&R Investment Associates X, Ltd. · CIK 0001759120 · 10% owner

CD&R Fund X Waterworks B1, L.P. · CIK 0001871836 · 10% owner

CD&R Fund X-A Waterworks B, L.P. · CIK 0001871835 · 10% owner

CD&R Waterworks Holdings, L.P. · CIK 0001871833 · 10% owner

CD&R Waterworks Holdings GP, Ltd. · CIK 0001871834 · 10% owner

CD&R Fund X Advisor Waterworks B, L.P. · CIK 0001871837 · 10% owner

CD&R Waterworks Holdings, LLC · CIK 0001874292 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Affiliate

Disclosed balance after: 8,246,997

F2 · ownership.direct: CD&R Waterworks Holdings GP, Ltd. ("CD&R Waterworks Holdings GP"), as the general partner of each of Fund X Advisor B, Fund X B1 and Fund X-A B (collectively, the "CD&R Blocker Fund AIVs"), CD&R Associates X Waterworks, L.P. ("CD&R Associates X"), as the sole shareholder of CD&R Waterworks Holdings GP, and CD&R Investment Associates X, Ltd. ("CD&R Investment Associates"), as the general partner of CD&R Associates X, may be deemed to beneficially own the securities held by the CD&R Blocker Fund AIVs. Each of CD&R Waterworks Holdings GP, CD&R Associates X and CD&R Investment Associates expressly disclaims beneficial ownership of the securities held by the CD&R Blocker Fund AIVs, except to the extent of its pecuniary interest therein.

F4 · ownership.direct: Represents securities held by CD&R Fund X-A Waterworks B, L.P. ("Fund X-A B").

SEC source: 0001209191-22-050942 · doc4.xml · nonDerivative · entry 2

CD&R Investment Associates X, Ltd. · CIK 0001759120 · 10% owner

CD&R Fund X Waterworks B1, L.P. · CIK 0001871836 · 10% owner

CD&R Fund X-A Waterworks B, L.P. · CIK 0001871835 · 10% owner

CD&R Waterworks Holdings, L.P. · CIK 0001871833 · 10% owner

CD&R Waterworks Holdings GP, Ltd. · CIK 0001871834 · 10% owner

CD&R Fund X Advisor Waterworks B, L.P. · CIK 0001871837 · 10% owner

CD&R Waterworks Holdings, LLC · CIK 0001874292 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Affiliate

Disclosed balance after: 91,661,962

F2 · ownership.direct: CD&R Waterworks Holdings GP, Ltd. ("CD&R Waterworks Holdings GP"), as the general partner of each of Fund X Advisor B, Fund X B1 and Fund X-A B (collectively, the "CD&R Blocker Fund AIVs"), CD&R Associates X Waterworks, L.P. ("CD&R Associates X"), as the sole shareholder of CD&R Waterworks Holdings GP, and CD&R Investment Associates X, Ltd. ("CD&R Investment Associates"), as the general partner of CD&R Associates X, may be deemed to beneficially own the securities held by the CD&R Blocker Fund AIVs. Each of CD&R Waterworks Holdings GP, CD&R Associates X and CD&R Investment Associates expressly disclaims beneficial ownership of the securities held by the CD&R Blocker Fund AIVs, except to the extent of its pecuniary interest therein.

F3 · ownership.direct: Represents securities held by CD&R Fund X Waterworks B1, L.P. ("Fund X B1").

SEC source: 0001209191-22-050942 · doc4.xml · nonDerivative · entry 1

CD&R Investment Associates X, Ltd. · CIK 0001759120 · 10% owner

CD&R Fund X Waterworks B1, L.P. · CIK 0001871836 · 10% owner

CD&R Fund X-A Waterworks B, L.P. · CIK 0001871835 · 10% owner

CD&R Waterworks Holdings, L.P. · CIK 0001871833 · 10% owner

CD&R Waterworks Holdings GP, Ltd. · CIK 0001871834 · 10% owner

CD&R Fund X Advisor Waterworks B, L.P. · CIK 0001871837 · 10% owner

CD&R Waterworks Holdings, LLC · CIK 0001874292 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Affiliate

Disclosed balance after: 612,411

F1 · ownership.direct: Represents securities held by CD&R Fund X Advisor Waterworks B, L.P. ("Fund X Advisor B").

F2 · ownership.direct: CD&R Waterworks Holdings GP, Ltd. ("CD&R Waterworks Holdings GP"), as the general partner of each of Fund X Advisor B, Fund X B1 and Fund X-A B (collectively, the "CD&R Blocker Fund AIVs"), CD&R Associates X Waterworks, L.P. ("CD&R Associates X"), as the sole shareholder of CD&R Waterworks Holdings GP, and CD&R Investment Associates X, Ltd. ("CD&R Investment Associates"), as the general partner of CD&R Associates X, may be deemed to beneficially own the securities held by the CD&R Blocker Fund AIVs. Each of CD&R Waterworks Holdings GP, CD&R Associates X and CD&R Investment Associates expressly disclaims beneficial ownership of the securities held by the CD&R Blocker Fund AIVs, except to the extent of its pecuniary interest therein.

SEC source: 0001209191-22-049780 · doc4.xml · derivative · entry 6

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 19,729 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 September 9, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 19,729 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 September 9, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 19,729 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.

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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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: 0001209191-22-049780 · doc4.xml · derivative · entry 5

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,729

Underlying: Class A Common Stock · 19,729 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 September 9, 2022, 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"), 19,729 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 19,729 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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: 0001209191-22-049780 · doc4.xml · derivative · entry 4

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 592,816

Underlying: Class A Common Stock · 19,729 shares

Expires not disclosed

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.

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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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.

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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 September 9, 2022, 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"), 19,729 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 19,729 Paired Interests.

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.

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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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.

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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 · 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: 0001209191-22-049780 · doc4.xml · nonDerivative · entry 2

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,286

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 14, 2022.

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 $24.75 to $24.855 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 5,286 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 RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-22-049780 · doc4.xml · nonDerivative · entry 1

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,015

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 September 9, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 19,729 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 September 9, 2022, 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"), 19,729 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 19,729 Paired Interests.

F3 · balance_after: Includes 5,286 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 RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-22-049029 · doc4.xml · nonDerivative · entry 1

Buck Robert M · CIK 0001644960 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,485

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 annual meeting of stockholders to be held in 2023 and be settled in shares of Class A common stock.

SEC source: 0001209191-22-047907 · doc4.xml · derivative · entry 7

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 32,865 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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: 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 August 25, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 32,865 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 August 25, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 32,865 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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: 0001209191-22-047907 · doc4.xml · derivative · entry 6

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,865

Underlying: Class A Common Stock · 32,865 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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: 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 August 25, 2022, pursuant to the terms of the LLC Agreement, 32,865 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 32,865 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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: 0001209191-22-047907 · doc4.xml · derivative · entry 5

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 935,499

Underlying: Class A Common Stock · 32,865 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 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 · 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 August 25, 2022, pursuant to the terms of the LLC Agreement, 32,865 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 32,865 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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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 disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (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: 0001209191-22-047907 · doc4.xml · nonDerivative · entry 4

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,866

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 1, 2022.

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 $25.00 to $25.165 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 4,866 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 RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.