CNM

SEC source: 0001209191-23-042506 · doc4.xml · nonDerivative · entry 3

Schaller John R · CIK 0001866571 · President

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 25,000

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

F4 · kind: On July 13, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 24,447 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock, on a one-for-one basis.

F5 · shares: On July 13, 2023, pursuant to the terms of the LLC Agreement, 24,447 vested Units held indirectly by the reporting person through the Trust were redeemed at the discretion of the Trust for 24,447 Paired Interests.

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

SEC source: 0001209191-23-042506 · doc4.xml · nonDerivative · entry 2

Schaller John R · CIK 0001866571 · President

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 553

F1 · shares: On July 13, 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"), 553 vested common units ("Units") held indirectly by the reporting person through the Schaller Family GST Trust DTD 06/12/2020 (the "Trust") were redeemed at the discretion of the Trust for 553 shares of Class A common stock of the Issuer ("Class A common stock").

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

SEC source: 0001209191-23-042506 · doc4.xml · nonDerivative · entry 1

Schaller John R · CIK 0001866571 · President

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 553

F1 · shares: On July 13, 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"), 553 vested common units ("Units") held indirectly by the reporting person through the Schaller Family GST Trust DTD 06/12/2020 (the "Trust") were redeemed at the discretion of the Trust for 553 shares of Class A common stock of the Issuer ("Class A common stock").

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

SEC source: 0001209191-23-040311 · doc4.xml · nonDerivative · entry 1

Gipson Dennis G · CIK 0001866536 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,320

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of stockholders to be held in 2024 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

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

SEC source: 0001209191-23-040308 · doc4.xml · nonDerivative · entry 1

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,320

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of stockholders to be held in 2024 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

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

SEC source: 0001209191-23-040314 · doc4.xml · nonDerivative · entry 1

MAZZARELLA KATHLEEN M · CIK 0001273233 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,320

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of stockholders to be held in 2024 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

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

SEC source: 0001209191-23-040315 · doc4.xml · nonDerivative · entry 1

NEWMAN MARGARET · CIK 0001579754 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,320

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of stockholders to be held in 2024 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

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

SEC source: 0001209191-23-040307 · doc4.xml · nonDerivative · entry 1

Buck Robert M · CIK 0001644960 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,412

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of stockholders to be held in 2024 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

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

SEC source: 0001209191-23-040306 · doc4.xml · nonDerivative · entry 1

Amirthalingam Bhavani · CIK 0001733097 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,518

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of stockholders to be held in 2024 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

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

SEC source: 0001209191-23-040312 · doc4.xml · nonDerivative · entry 1

Kimbrough Orvin T · CIK 0001867452 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,320

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of stockholders to be held in 2024 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

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

SEC source: 0001209191-23-040230 · doc4.xml · derivative · entry 5

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 49,904 shares

Expires not disclosed

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

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

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

F1 · kind: On June 27, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 49,904 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 June 27, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 49,904 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

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

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

SEC source: 0001209191-23-040230 · doc4.xml · derivative · entry 4

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 49,904

Underlying: Class A Common Stock · 49,904 shares

Expires not disclosed

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

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

F2 · shares: On June 27, 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"), 49,904 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 49,904 Paired Interests.

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

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

SEC source: 0001209191-23-040230 · doc4.xml · derivative · entry 3

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 718,928

Underlying: Class A Common Stock · 49,904 shares

Expires not disclosed

F6 · 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.

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

F6 · date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F7 · 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 June 27, 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"), 49,904 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 49,904 Paired Interests.

F6 · 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.

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

F6 · derivative.expiration_date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F7 · 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.

F6 · 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: 0001209191-23-040230 · doc4.xml · nonDerivative · entry 2

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 9,672

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 13, 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 $30.0000 to $30.0550 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 9,672 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest in two equal installments on March 11, 2024 and March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in 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: 0001209191-23-040230 · doc4.xml · nonDerivative · entry 1

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 59,576

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 June 27, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 49,904 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 June 27, 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"), 49,904 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 49,904 Paired Interests.

F3 · balance_after: Includes 9,672 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest in two equal installments on March 11, 2024 and March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in 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: 0001209191-23-036330 · doc4.xml · derivative · entry 10

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: No plan indicated

Ownership: Indirect · By Affiliate

Disclosed balance after: 45,656,051

Underlying: Class A Common Stock · 1,874,272 shares

Expires not disclosed

F9 · 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.

F10 · kind: Represents a redemption of Partnership Interests by Core & Main Holdings, LP at $28.215 per share, the same price per share of Class A common stock of the Issuer paid by the underwriter to the reporting person in the concurrent underwritten offering. In connection with the redemption, the Issuer repurchased a corresponding number of shares of Class B common stock of the Issuer from the reporting person for no additional consideration.

F9 · 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.

F9 · 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: 0001209191-23-036330 · doc4.xml · derivative · entry 9

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: No plan indicated

Ownership: Indirect · By Affiliate

Disclosed balance after: 47,530,323

Underlying: Class A Common Stock · 5,247,962 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, 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 June 12, 2023, 5,247,962 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").

F9 · 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.

F9 · 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: 0001209191-23-036330 · doc4.xml · nonDerivative · entry 8

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: No plan indicated

Ownership: Indirect · By Affiliate

Disclosed balance after: 6,246,751

F8 · kind: Represents a purchase of Class A common stock of the Issuer by the Issuer at $28.215 per share, the same price per share paid by the underwriter to the reporting person in the concurrent underwritten offering.

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 (as defined below) and Fund X-A B (as defined below) (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: 0001209191-23-036330 · doc4.xml · nonDerivative · entry 7

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: No plan indicated

Ownership: Indirect · By Affiliate

Disclosed balance after: 69,430,066

F8 · kind: Represents a purchase of Class A common stock of the Issuer by the Issuer at $28.215 per share, the same price per share paid by the underwriter to the reporting person in the concurrent underwritten offering.

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 (as defined below) and Fund X-A B (as defined below) (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: 0001209191-23-036330 · doc4.xml · nonDerivative · 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: No plan indicated

Ownership: Indirect · By Affiliate

Disclosed balance after: 463,876

F8 · kind: Represents a purchase of Class A common stock of the Issuer by the Issuer at $28.215 per share, the same price per share paid by the underwriter to the reporting person in the concurrent underwritten offering.

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 (as defined below) and Fund X-A B (as defined below) (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: 0001209191-23-036330 · 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: No plan indicated

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: 0001209191-23-036330 · 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: No plan indicated

Ownership: Indirect · By Affiliate

Disclosed balance after: 5,247,962

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 June 12, 2023, 5,247,962 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: 0001209191-23-036330 · 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: No plan indicated

Ownership: Indirect · By Affiliate

Disclosed balance after: 6,503,193

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 (as defined below) and Fund X-A B (as defined below) (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: 0001209191-23-036330 · 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: No plan indicated

Ownership: Indirect · By Affiliate

Disclosed balance after: 72,280,309

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 (as defined below) and Fund X-A B (as defined below) (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: 0001209191-23-036330 · 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: No plan indicated

Ownership: Indirect · By Affiliate

Disclosed balance after: 482,919

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 (as defined below) and Fund X-A B (as defined below) (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: 0001209191-23-035575 · doc4.xml · derivative · entry 11

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 35,712 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.

F11 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F6 · kind: On June 7, 2023, pursuant to the terms of the Exchange Agreement, 35,712 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F6 · shares: On June 7, 2023, pursuant to the terms of the Exchange Agreement, 35,712 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F11 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · derivative.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: 0001209191-23-035575 · doc4.xml · derivative · entry 10

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 35,712

Underlying: Class A Common Stock · 35,712 shares

Expires not disclosed

F11 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F7 · shares: On June 7, 2023, pursuant to the terms of the LLC Agreement, 35,712 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 35,712 Paired Interests.

F11 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · derivative.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: 0001209191-23-035575 · doc4.xml · derivative · entry 9

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

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 2,272,703

Underlying: Class A Common Stock · 35,712 shares

Expires not disclosed

F10 · 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.

F11 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · date: 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.

F11 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F7 · shares: On June 7, 2023, pursuant to the terms of the LLC Agreement, 35,712 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 35,712 Paired Interests.

F10 · 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.

F11 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · derivative.expiration_date: 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.

F11 · 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.

F10 · 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: 0001209191-23-035575 · doc4.xml · nonDerivative · entry 4

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 73,692

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 13, 2023.

F8 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $28.7500 to $28.8400 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 73,692 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest in two equal installments on March 11, 2024 and March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in 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: 0001209191-23-035575 · doc4.xml · nonDerivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 109,404

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

F6 · kind: On June 7, 2023, pursuant to the terms of the Exchange Agreement, 35,712 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F7 · shares: On June 7, 2023, pursuant to the terms of the LLC Agreement, 35,712 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 35,712 Paired Interests.

F3 · balance_after: Includes 73,692 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest in two equal installments on March 11, 2024 and March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in 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: 0001209191-23-035574 · doc4.xml · derivative · entry 5

Cowles Bradford A · CIK 0001866531 · President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 24,889 shares

Expires not disclosed

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

F7 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of 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: 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 June 6, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 24,889 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 June 6, 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"), 24,889 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 24,889 Paired Interests.

F7 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of 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: 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: 0001209191-23-035574 · doc4.xml · derivative · entry 4

Cowles Bradford A · CIK 0001866531 · President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 24,889

Underlying: Class A Common Stock · 24,889 shares

Expires not disclosed

F7 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of 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: 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 June 6, 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"), 24,889 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 24,889 Paired Interests.

F7 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of 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: 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: 0001209191-23-035574 · doc4.xml · derivative · entry 3

Cowles Bradford A · CIK 0001866531 · President

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 998,456

Underlying: Class A Common Stock · 24,889 shares

Expires not disclosed

F6 · 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.

F7 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of 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.

F6 · date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F7 · 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 June 6, 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"), 24,889 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 24,889 Paired Interests.

F6 · 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.

F7 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of 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.

F6 · derivative.expiration_date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F7 · 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.

F6 · 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: 0001209191-23-035574 · doc4.xml · nonDerivative · entry 2

Cowles Bradford A · CIK 0001866531 · President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 14,679

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 13, 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 $28.0000 to $28.3700 per share. The reporting person will provide to the Issuer, or the Securities and Exchange Commission staff, upon request, information regarding the number of shares sold at each price within the range.

F3 · balance_after: Includes 14,679 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest in two equal installments on March 11, 2024 and March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in 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: 0001209191-23-035574 · doc4.xml · nonDerivative · entry 1

Cowles Bradford A · CIK 0001866531 · President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 39,568

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 June 6, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 24,889 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 June 6, 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"), 24,889 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 24,889 Paired Interests.

F3 · balance_after: Includes 14,679 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest in two equal installments on March 11, 2024 and March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in 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: 0001209191-23-035576 · doc4.xml · derivative · entry 5

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 50,000 shares

Expires not disclosed

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

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

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

F1 · kind: On June 6, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 50,000 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F1 · shares: On June 6, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 50,000 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

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

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

SEC source: 0001209191-23-035576 · doc4.xml · derivative · entry 4

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Class A Common Stock · 50,000 shares

Expires not disclosed

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

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

F2 · shares: On June 6, 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"), 50,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 50,000 Paired Interests.

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

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

SEC source: 0001209191-23-035576 · doc4.xml · derivative · entry 3

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 768,832

Underlying: Class A Common Stock · 50,000 shares

Expires not disclosed

F6 · 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.

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

F6 · date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F7 · 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 June 6, 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"), 50,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 50,000 Paired Interests.

F6 · 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.

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

F6 · derivative.expiration_date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F7 · 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.

F6 · 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: 0001209191-23-035576 · doc4.xml · nonDerivative · entry 2

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 9,672

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 13, 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 $28.000 to $28.7400 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 9,672 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest in two equal installments on March 11, 2024 and March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in 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: 0001209191-23-035576 · doc4.xml · nonDerivative · entry 1

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 59,672

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 June 6, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 50,000 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F2 · shares: On June 6, 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"), 50,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 50,000 Paired Interests.

F3 · balance_after: Includes 9,672 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest in two equal installments on March 11, 2024 and March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in 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: 0001209191-23-035575 · doc4.xml · derivative · entry 8

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 4,288 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.

F11 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · 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 June 6, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 4,288 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 June 6, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 4,288 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.

F11 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · derivative.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: 0001209191-23-035575 · doc4.xml · derivative · entry 7

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 4,288

Underlying: Class A Common Stock · 4,288 shares

Expires not disclosed

F11 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · 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 June 6, 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"), 4,288 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 4,288 Paired Interests.

F11 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · derivative.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: 0001209191-23-035575 · doc4.xml · derivative · entry 6

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

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 2,308,415

Underlying: Class A Common Stock · 4,288 shares

Expires not disclosed

F10 · 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.

F11 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · date: 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.

F11 · 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 June 6, 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"), 4,288 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 4,288 Paired Interests.

F10 · 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.

F11 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F10 · derivative.expiration_date: 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.

F11 · 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.

F10 · 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: 0001209191-23-035575 · doc4.xml · nonDerivative · entry 2

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 73,692

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 13, 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 $28.7500 to $28.8000 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 73,692 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest in two equal installments on March 11, 2024 and March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in 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: 0001209191-23-035575 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 77,980

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 June 6, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 4,288 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 June 6, 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"), 4,288 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 4,288 Paired Interests.

F3 · balance_after: Includes 73,692 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest in two equal installments on March 11, 2024 and March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in 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: 0001209191-23-031609 · doc4.xml · derivative · entry 5

Cowles Bradford A · CIK 0001866531 · President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 25,000 shares

Expires not disclosed

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

F7 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of 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: 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 May 18, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 25,000 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F2 · shares: On May 18, 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"), 25,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 25,000 Paired Interests.

F7 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of 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: 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: 0001209191-23-031609 · doc4.xml · derivative · entry 4

Cowles Bradford A · CIK 0001866531 · President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 25,000

Underlying: Class A Common Stock · 25,000 shares

Expires not disclosed

F7 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of 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: 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 May 18, 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"), 25,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 25,000 Paired Interests.

F7 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of 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: 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: 0001209191-23-031609 · doc4.xml · derivative · entry 3

Cowles Bradford A · CIK 0001866531 · President

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 1,023,345

Underlying: Class A Common Stock · 25,000 shares

Expires not disclosed

F6 · 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.

F7 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of 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.

F6 · date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F7 · 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 May 18, 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"), 25,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 25,000 Paired Interests.

F6 · 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.

F7 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of 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.

F6 · derivative.expiration_date: Represents securities held by Management Feeder in respect of Units directly held by the reporting person. Pursuant to the LLC Agreement, such vested Units held by the reporting person are redeemable at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F7 · 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.

F6 · 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: 0001209191-23-031609 · doc4.xml · nonDerivative · entry 2

Cowles Bradford A · CIK 0001866531 · President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 14,679

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 13, 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 $26.9400 to $27.7000 per share. The reporting person will provide to the Issuer, or the Securities and Exchange Commission staff, upon request, information regarding the number of shares sold at each price within the range.

F3 · balance_after: Includes 14,679 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest in two equal installments on March 11, 2024 and March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in 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: 0001209191-23-031609 · doc4.xml · nonDerivative · entry 1

Cowles Bradford A · CIK 0001866531 · President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 39,679

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 May 18, 2023, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 25,000 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F2 · shares: On May 18, 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"), 25,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 25,000 Paired Interests.

F3 · balance_after: Includes 14,679 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest in two equal installments on March 11, 2024 and March 11, 2025, subject to the reporting person remaining employed with the Issuer through each vesting date. The RSUs granted on March 10, 2023 vest in 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.