LeClair Stephen O

SEC source: 0001104659-26-094201 · tm2622812-11_4seq1.xml · derivative · entry 1

LeClair Stephen O · CIK 0001659312 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,825

Underlying: Common Stock · 5,825 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of ADI Global Distribution Inc. (the "Issuer") common stock.

F2 · derivative.exercise_date: The RSUs will vest on August 7, 2027.

F2 · derivative.expiration_date: The RSUs will vest on August 7, 2027.

SEC source: 0001659312-26-000006 · primarydocument.xml · nonDerivative · entry 1

LeClair Stephen O · CIK 0001659312 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 797

F1 · balance_after: Includes unvested Restricted Stock Units ("RSUs").

SEC source: 0001659312-26-000004 · primarydocument.xml · nonDerivative · entry 1

LeClair Stephen O · CIK 0001659312 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 755

F1 · kind: Restricted Stock Units ("RSUs") granted by the Issuer to the Reporting Person. Each RSU represents a contingent right to acquire one (1) share of Dycom Industries, Inc. common stock par value $0.33 1/3 per share ("DY common stock") upon vesting.

F1 · shares: Restricted Stock Units ("RSUs") granted by the Issuer to the Reporting Person. Each RSU represents a contingent right to acquire one (1) share of Dycom Industries, Inc. common stock par value $0.33 1/3 per share ("DY common stock") upon vesting.

F2 · shares: The RSUs vest in one annual installment upon the earlier to occur of (i) May 28, 2027 or (ii) the date of the next annual meeting of shareholders of the Company.

F3 · price: No consideration was paid for the RSUs.

F4 · balance_after: Includes unvested RSUs.

SEC source: 0001659312-26-000003 · wk-form4_1778798938.xml · nonDerivative · entry 1

LeClair Stephen O · CIK 0001659312 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,566

F1 · shares: Restricted Stock Grant, vesting ratably on an annual basis over three years (the duration of the director's remaining term).

SEC source: 0001659312-26-000002 · primarydocument.xml · nonDerivative · entry 1

LeClair Stephen O · CIK 0001659312 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 424

SEC source: 0001856525-26-000004 · wk-form4_1773263431.xml · nonDerivative · entry 2

LeClair Stephen O · CIK 0001659312 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 66,136

F1 · shares: Represents shares withheld by the Issuer for tax withholding purposes upon the vesting of a portion of restricted stock units granted to the reporting person.

SEC source: 0001856525-26-000004 · wk-form4_1773263431.xml · nonDerivative · entry 1

LeClair Stephen O · CIK 0001659312 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 69,217

F1 · shares: Represents shares withheld by the Issuer for tax withholding purposes upon the vesting of a portion of restricted stock units granted to the reporting person.

SEC source: 0001659312-26-000001 · primarydocument.xml · nonDerivative · entry 1

LeClair Stephen O · CIK 0001659312 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 396

SEC source: 0001659312-25-000007 · primarydocument.xml · nonDerivative · entry 1

LeClair Stephen O · CIK 0001659312 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 337

F1 · security: Each restricted stock unit represents a contingent right to acquire one (1) share of Dycom Industries, Inc. common stock, par value $0.33 1/3 per share.

F2 · shares: The restricted stock units vest in one annual installment on November 7, 2026.

F3 · price: No consideration was paid for the restricted stock units.

SEC source: 0001856525-25-000145 · wk-form4_1752012355.xml · derivative · entry 6

LeClair Stephen O · CIK 0001659312 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 135,877

Underlying: Class A Common Stock · 44,972 shares

Expires 2032-03-10

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.

F3 · derivative.exercise_date: The options vest in three equal annual installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date.

SEC source: 0001856525-25-000145 · wk-form4_1752012355.xml · nonDerivative · entry 4

LeClair Stephen O · CIK 0001659312 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 70,736

F2 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $61.6300 to $62.2800 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.

SEC source: 0001856525-25-000145 · wk-form4_1752012355.xml · nonDerivative · entry 3

LeClair Stephen O · CIK 0001659312 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 115,708

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.

SEC source: 0001856525-25-000145 · wk-form4_1752012355.xml · derivative · entry 5

LeClair Stephen O · CIK 0001659312 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 180,849

Underlying: Class A Common Stock · 80,028 shares

Expires 2032-03-10

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.

F3 · derivative.exercise_date: The options vest in three equal annual installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date.

SEC source: 0001856525-25-000145 · wk-form4_1752012355.xml · nonDerivative · entry 2

LeClair Stephen O · CIK 0001659312 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 70,736

F1 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $62.1000 to $62.4650 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.

SEC source: 0001856525-25-000145 · wk-form4_1752012355.xml · nonDerivative · entry 1

LeClair Stephen O · CIK 0001659312 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 150,764

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.

SEC source: 0000824142-25-000155 · wk-form4a_1747339745.xml · nonDerivative · entry 1

LeClair Stephen O · CIK 0001659312 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,276

F1 · shares: Restricted Stock Grant, vesting one year from the date of the award (the duration of the director's remaining term).

F2 · shares: Amended FORM 4 filed to increase shares granted by 110 shares to 1,534 shares (originally filed as 1,424 shares). Amended FORM 4 filing (originally filed May 15, 2025) was timely filed within the 2 business days after the original transaction date.

SEC source: 0000824142-25-000138 · wk-form4_1747317910.xml · nonDerivative · entry 1

LeClair Stephen O · CIK 0001659312 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,166

F1 · shares: Restricted Stock Grant, vesting one year from the date of the award (the duration of the director's remaining term).

SEC source: 0001856525-25-000051 · wk-form4_1741900283.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 70,736

F1 · shares: Represents shares withheld by the Issuer for tax withholding purposes upon the vesting of a portion of restricted stock units ("RSUs") granted to the reporting person.

SEC source: 0001856525-25-000042 · wk-form4_1741733617.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,625

F1 · shares: Represents shares withheld by the Issuer for tax withholding purposes upon the vesting of a portion of restricted stock units ("RSUs") granted to the reporting person.

SEC source: 0001856525-25-000042 · wk-form4_1741733617.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,296

F1 · shares: Represents shares withheld by the Issuer for tax withholding purposes upon the vesting of a portion of restricted stock units ("RSUs") granted to the reporting person.

SEC source: 0001856525-25-000017 · wk-form4_1737151192.xml · derivative · entry 6

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By LLC

Disclosed balance after: 0

Underlying: Class A Common Stock · 250,000 shares

Expires not disclosed

F3 · derivative.exercise_price: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F6 · derivative.exercise_price: Represents securities held by Management Feeder in respect of 250,000 Units (the "Irrevocable Trust Transferred Units") transferred by the reporting person to an irrevocable trust for the benefit of the reporting person, his wife and descendants (the "Irrevocable Trust") on January 15, 2025 (the "Irrevocable Trust Effective Date"). The reporting person is not a trustee of the Irrevocable Trust. Pursuant to the LLC Agreement, such Irrevocable Trust Transferred Units held by the Irrevocable Trust following the transaction being reported herein are redeemable at the discretion of the Irrevocable Trust for shares of Class B Common Stock and Paired Interests, on a one-for-one basis.

F3 · date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F6 · date: Represents securities held by Management Feeder in respect of 250,000 Units (the "Irrevocable Trust Transferred Units") transferred by the reporting person to an irrevocable trust for the benefit of the reporting person, his wife and descendants (the "Irrevocable Trust") on January 15, 2025 (the "Irrevocable Trust Effective Date"). The reporting person is not a trustee of the Irrevocable Trust. Pursuant to the LLC Agreement, such Irrevocable Trust Transferred Units held by the Irrevocable Trust following the transaction being reported herein are redeemable at the discretion of the Irrevocable Trust for shares of Class B Common Stock and Paired Interests, on a one-for-one basis.

F7 · shares: On the Irrevocable Trust Effective Date, the reporting person transferred and assigned the Irrevocable Trust Transferred Units to the Irrevocable Trust.

F3 · derivative.exercise_date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F6 · derivative.exercise_date: Represents securities held by Management Feeder in respect of 250,000 Units (the "Irrevocable Trust Transferred Units") transferred by the reporting person to an irrevocable trust for the benefit of the reporting person, his wife and descendants (the "Irrevocable Trust") on January 15, 2025 (the "Irrevocable Trust Effective Date"). The reporting person is not a trustee of the Irrevocable Trust. Pursuant to the LLC Agreement, such Irrevocable Trust Transferred Units held by the Irrevocable Trust following the transaction being reported herein are redeemable at the discretion of the Irrevocable Trust for shares of Class B Common Stock and Paired Interests, on a one-for-one basis.

F3 · derivative.expiration_date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F6 · derivative.expiration_date: Represents securities held by Management Feeder in respect of 250,000 Units (the "Irrevocable Trust Transferred Units") transferred by the reporting person to an irrevocable trust for the benefit of the reporting person, his wife and descendants (the "Irrevocable Trust") on January 15, 2025 (the "Irrevocable Trust Effective Date"). The reporting person is not a trustee of the Irrevocable Trust. Pursuant to the LLC Agreement, such Irrevocable Trust Transferred Units held by the Irrevocable Trust following the transaction being reported herein are redeemable at the discretion of the Irrevocable Trust for shares of Class B Common Stock and Paired Interests, on a one-for-one basis.

F3 · ownership.direct: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

SEC source: 0001856525-25-000017 · wk-form4_1737151192.xml · derivative · entry 5

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 1,522,945

Underlying: Class A Common Stock · 1,522,945 shares

Expires not disclosed

F3 · derivative.exercise_price: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F4 · derivative.exercise_price: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 1,522,945 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on January 15, 2025 (the "Effective Date"). Pursuant to the Fourth Amended and Restated LLC Agreement of Management Feeder, dated as of February 13, 2024 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F3 · date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F4 · date: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 1,522,945 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on January 15, 2025 (the "Effective Date"). Pursuant to the Fourth Amended and Restated LLC Agreement of Management Feeder, dated as of February 13, 2024 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F5 · shares: On the Effective Date, the reporting person transferred and assigned the Transferred Units to the Trust.

F3 · derivative.exercise_date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F4 · derivative.exercise_date: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 1,522,945 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on January 15, 2025 (the "Effective Date"). Pursuant to the Fourth Amended and Restated LLC Agreement of Management Feeder, dated as of February 13, 2024 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F3 · derivative.expiration_date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F4 · derivative.expiration_date: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 1,522,945 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on January 15, 2025 (the "Effective Date"). Pursuant to the Fourth Amended and Restated LLC Agreement of Management Feeder, dated as of February 13, 2024 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F3 · ownership.direct: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

SEC source: 0001856525-25-000017 · wk-form4_1737151192.xml · derivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Indirect · By LLC

Disclosed balance after: 250,000

Underlying: Class A Common Stock · 1,522,945 shares

Expires not disclosed

F3 · derivative.exercise_price: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F4 · derivative.exercise_price: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 1,522,945 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on January 15, 2025 (the "Effective Date"). Pursuant to the Fourth Amended and Restated LLC Agreement of Management Feeder, dated as of February 13, 2024 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F3 · date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F4 · date: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 1,522,945 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on January 15, 2025 (the "Effective Date"). Pursuant to the Fourth Amended and Restated LLC Agreement of Management Feeder, dated as of February 13, 2024 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F5 · shares: On the Effective Date, the reporting person transferred and assigned the Transferred Units to the Trust.

F3 · derivative.exercise_date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F4 · derivative.exercise_date: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 1,522,945 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on January 15, 2025 (the "Effective Date"). Pursuant to the Fourth Amended and Restated LLC Agreement of Management Feeder, dated as of February 13, 2024 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F3 · derivative.expiration_date: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

F4 · derivative.expiration_date: Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") in respect of 1,522,945 Units (the "Transferred Units") transferred by the reporting person to a revocable trust for the benefit of the reporting person, his wife and descendants (the "Trust") on January 15, 2025 (the "Effective Date"). Pursuant to the Fourth Amended and Restated LLC Agreement of Management Feeder, dated as of February 13, 2024 (as amended, the "LLC Agreement"), such Transferred Units held by the Trust following the transaction being reported herein are redeemable at the discretion of the reporting person for shares of Class B Common Stock of the Issuer ("Class B Common Stock") and limited partnership interests of Core & Main Holdings, LP ("Limited Partnership Interests" and, together with Class B Common Stock, "Paired Interests"), on a one-for-one basis.

F3 · ownership.direct: Pursuant to the terms of an exchange agreement dated as of July 22, 2021 (as amended, the "Exchange Agreement"), Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A Common Stock of the Issuer ("Class A Common Stock") on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A Common Stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each Limited Partnership Interest exchanged, subject to certain exceptions, conditions and adjustments). The shares of Class B Common Stock and Limited Partnership Interests have no expiration date.

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

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 200,000 shares

Expires not disclosed

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

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

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

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

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

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

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

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

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 200,000

Underlying: Class A Common Stock · 200,000 shares

Expires not disclosed

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

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

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

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

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

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

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

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 1,772,945

Underlying: Class A Common Stock · 200,000 shares

Expires not disclosed

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

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

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

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

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

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

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

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

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

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

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

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 92,349

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

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

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

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

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 292,349

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

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

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

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

SEC source: 0000824142-24-000141 · wk-form4_1716474309.xml · nonDerivative · entry 1

LeClair Stephen O · CIK 0001659312 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,742

F1 · shares: Restricted Stock Grant, vesting ratably on an annual basis over two years (the duration of the director's remaining term).

F2 · balance_after: The number of securities beneficially owned for each stock award has been updated to reflect the August 16, 2023 stock split as disclosed in the Company's Form 8-K dated June 6, 2023.

SEC source: 0001856525-25-000017 · wk-form4_1737151192.xml · nonDerivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 81,137

F1 · kind: Represents prior share forfeitures to the Issuer for tax withholding purposes upon the vesting of a portion of restricted stock units ("RSUs") granted to the reporting person.

F2 · balance_after: Of the 92,349 RSUs originally granted an aggregate of 11,212 shares of Class A common stock have been forfeited to the Issuer for tax withholdings purposes and an aggregate of 25,266 shares of Class A common stock have vested with 55,871 RSUs remaining unvested, as of the date of this Form 4. Each RSU represents a contingent right to receive one share of Class A common stock. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest on March 11, 2025. The RSUs granted on March 10, 2023 vest in two equal installments on March 10, 2025 and March 10, 2026. The RSUs granted on March 7, 2024 vest in three equal installments on March 7, 2025, March 7, 2026 and March 7, 2027. All RSU vesting is subject to the terms of the associated Participant Restricted Stock Unit Agreement.

SEC source: 0001856525-25-000017 · wk-form4_1737151192.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 85,189

F1 · kind: Represents prior share forfeitures to the Issuer for tax withholding purposes upon the vesting of a portion of restricted stock units ("RSUs") granted to the reporting person.

F2 · balance_after: Of the 92,349 RSUs originally granted an aggregate of 11,212 shares of Class A common stock have been forfeited to the Issuer for tax withholdings purposes and an aggregate of 25,266 shares of Class A common stock have vested with 55,871 RSUs remaining unvested, as of the date of this Form 4. Each RSU represents a contingent right to receive one share of Class A common stock. Each RSU represents a contingent right to receive one share of Class A common stock. The unvested portion of the RSUs granted on March 11, 2022 vest on March 11, 2025. The RSUs granted on March 10, 2023 vest in two equal installments on March 10, 2025 and March 10, 2026. The RSUs granted on March 7, 2024 vest in three equal installments on March 7, 2025, March 7, 2026 and March 7, 2027. All RSU vesting is subject to the terms of the associated Participant Restricted Stock Unit Agreement.

SEC source: 0001856525-24-000025 · wk-form4_1710205865.xml · derivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 146,508

Underlying: Class A Common Stock · 146,508 shares

Expires 2034-03-07

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

SEC source: 0001856525-24-000025 · wk-form4_1710205865.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 92,349

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

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

SEC source: 0000950170-24-015555 · ownership.xml · derivative · entry 5

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 150,000 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 February 12, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 150,000 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 February 12, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 150,000 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: 0000950170-24-015555 · ownership.xml · derivative · entry 4

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 150,000

Underlying: Class A Common Stock · 150,000 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 February 12, 2024, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 150,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 150,000 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: 0000950170-24-015555 · ownership.xml · derivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 1,972,945

Underlying: Class A Common Stock · 150,000 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 February 12, 2024, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 150,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 150,000 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: 0000950170-24-015555 · ownership.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 October 11, 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 $43.6900 to $44.5100 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 terms of the associated Participant Restricted Stock Unit Agreement. 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 terms of the associated Participant Restricted Stock Unit Agreement.

SEC source: 0000950170-24-015555 · ownership.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 223,692

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

F1 · kind: On February 12, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 150,000 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 February 12, 2024, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 150,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 150,000 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 terms of the associated Participant Restricted Stock Unit Agreement. 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 terms of the associated Participant Restricted Stock Unit Agreement.

SEC source: 0001209191-24-001676 · doc4.xml · derivative · entry 7

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 · 149,758 shares

Expires not disclosed

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

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

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

F4 · kind: On January 11, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 149,758 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock, on a one-for-one basis.

F4 · shares: On January 11, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 149,758 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock, on a one-for-one basis.

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

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

SEC source: 0001209191-24-001676 · doc4.xml · derivative · entry 6

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 149,758

Underlying: Class A Common Stock · 149,758 shares

Expires not disclosed

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

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

F5 · shares: On January 11, 2024, pursuant to the terms of the LLC Agreement, 149,758 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 149,758 Paired Interests.

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

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

SEC source: 0001209191-24-001676 · doc4.xml · derivative · entry 5

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

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 2,122,945

Underlying: Class A Common Stock · 149,758 shares

Expires not disclosed

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

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

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

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

F5 · shares: On January 11, 2024, pursuant to the terms of the LLC Agreement, 149,758 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 149,758 Paired Interests.

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

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

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

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

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

SEC source: 0001209191-24-001676 · 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

F6 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 11, 2023.

F7 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $40.2500 to $41.1100 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: 0001209191-24-001676 · doc4.xml · nonDerivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 223,692

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 January 11, 2024, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 149,758 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 January 11, 2024, pursuant to the terms of the LLC Agreement, 149,758 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 149,758 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: 0001209191-24-001676 · doc4.xml · nonDerivative · entry 2

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 73,934

F1 · shares: On January 11, 2024, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 242 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 242 shares of Class A common stock of the Issuer ("Class A common stock").

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: 0001209191-24-001676 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Indirect · By LLC

Disclosed balance after: 0

F1 · shares: On January 11, 2024, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 242 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 242 shares of Class A common stock of the Issuer ("Class A common stock").

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

SEC source: 0001209191-23-035575 · 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.