CNM

SEC source: 0001209191-22-047907 · doc4.xml · nonDerivative · entry 3

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,199

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 August 25, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 32,865 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "paired interest") were exchanged for shares of Class A common stock, on a one-for-one basis.

F5 · shares: On August 25, 2022, pursuant to the terms of the LLC Agreement, 32,865 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 32,865 Paired Interests.

F3 · balance_after: Includes 4,866 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-22-047907 · doc4.xml · nonDerivative · entry 2

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,334

F1 · shares: On August 25, 2022, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 468 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 468 shares of Class A common stock of the Issuer ("Class A common stock").

F3 · balance_after: Includes 4,866 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-22-047907 · doc4.xml · nonDerivative · entry 1

Schneider Laura K · CIK 0001866572 · Chief Human Resources Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 96

F1 · shares: On August 25, 2022, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 468 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 468 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: 0001209191-22-046790 · doc4.xml · derivative · entry 12

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 14,730 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.

F12 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F8 · kind: On August 18, 2022, pursuant to the terms of the Exchange Agreement, 14,730 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F8 · shares: On August 18, 2022, pursuant to the terms of the Exchange Agreement, 14,730 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F12 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001209191-22-046790 · doc4.xml · derivative · entry 11

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,730

Underlying: Class A Common Stock · 14,730 shares

Expires not disclosed

F12 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F9 · shares: On August 18, 2022, pursuant to the terms of the LLC Agreement, 14,730 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 14,730 Paired Interests.

F12 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001209191-22-046790 · doc4.xml · derivative · entry 10

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 2,352,703

Underlying: Class A Common Stock · 14,730 shares

Expires not disclosed

F11 · 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.

F12 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · 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.

F12 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F9 · shares: On August 18, 2022, pursuant to the terms of the LLC Agreement, 14,730 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 14,730 Paired Interests.

F11 · 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.

F12 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · 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.

F12 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

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

SEC source: 0001209191-22-046790 · doc4.xml · nonDerivative · entry 6

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,742

F6 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 11, 2022.

F10 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $24.50 to $24.59 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 35,742 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-22-046790 · doc4.xml · nonDerivative · entry 5

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,472

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

F8 · kind: On August 18, 2022, pursuant to the terms of the Exchange Agreement, 14,730 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F9 · shares: On August 18, 2022, pursuant to the terms of the LLC Agreement, 14,730 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 14,730 Paired Interests.

F3 · balance_after: Includes 35,742 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-22-046791 · doc4.xml · derivative · entry 12

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 5,296 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.

F12 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F8 · kind: On August 18, 2022, pursuant to the terms of the Exchange Agreement, 5,296 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F8 · shares: On August 18, 2022, pursuant to the terms of the Exchange Agreement, 5,296 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F12 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001209191-22-046791 · doc4.xml · derivative · entry 11

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,296

Underlying: Class A Common Stock · 5,296 shares

Expires not disclosed

F12 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F9 · shares: On August 18, 2022, pursuant to the terms of the LLC Agreement, 5,296 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 5,296 Paired Interests.

F12 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001209191-22-046791 · doc4.xml · derivative · entry 10

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 612,545

Underlying: Class A Common Stock · 5,296 shares

Expires not disclosed

F11 · 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.

F12 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · 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.

F12 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F9 · shares: On August 18, 2022, pursuant to the terms of the LLC Agreement, 5,296 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 5,296 Paired Interests.

F11 · 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.

F12 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · 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.

F12 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

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

SEC source: 0001209191-22-046791 · doc4.xml · nonDerivative · entry 6

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,286

F6 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 14, 2022.

F10 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $24.75 to $24.845 per share. The reporting person will provide to the Issuer, or the Securities and Exchange Commission staff, upon request, information regarding the number of shares sold at each price within the range.

F3 · balance_after: Includes 5,286 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-22-046791 · doc4.xml · nonDerivative · entry 5

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,582

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

F8 · kind: On August 18, 2022, pursuant to the terms of the Exchange Agreement, 5,296 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F9 · shares: On August 18, 2022, pursuant to the terms of the LLC Agreement, 5,296 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 5,296 Paired Interests.

F3 · balance_after: Includes 5,286 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-22-046790 · doc4.xml · derivative · entry 9

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 24,119 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.

F12 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F4 · kind: On August 16, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 24,119 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "paired interest") were exchanged for shares of Class A common stock, on a one-for-one basis.

F4 · shares: On August 16, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 24,119 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.

F12 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001209191-22-046790 · doc4.xml · derivative · entry 8

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,119

Underlying: Class A Common Stock · 24,119 shares

Expires not disclosed

F12 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F5 · shares: On August 16, 2022, pursuant to the terms of the LLC Agreement, 24,119 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 24,119 Paired Interests.

F12 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001209191-22-046790 · doc4.xml · derivative · entry 7

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 2,367,433

Underlying: Class A Common Stock · 24,119 shares

Expires not disclosed

F11 · 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.

F12 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · 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.

F12 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F5 · shares: On August 16, 2022, pursuant to the terms of the LLC Agreement, 24,119 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 24,119 Paired Interests.

F11 · 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.

F12 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · 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.

F12 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

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

SEC source: 0001209191-22-046790 · doc4.xml · nonDerivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,742

F6 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 11, 2022.

F7 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $24.50 to $24.85 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 35,742 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-22-046790 · doc4.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 61,012

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 August 16, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 24,119 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 August 16, 2022, pursuant to the terms of the LLC Agreement, 24,119 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 24,119 Paired Interests.

F3 · balance_after: Includes 35,742 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-22-046790 · doc4.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,893

F1 · shares: On August 16, 2022, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 1,151 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 1,151 shares of Class A common stock of the Issuer ("Class A common stock").

F3 · balance_after: Includes 35,742 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-22-046790 · doc4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 242

F1 · shares: On August 16, 2022, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 1,151 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 1,151 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: 0001209191-22-046791 · doc4.xml · derivative · entry 9

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 5,876 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.

F12 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F4 · kind: On August 16, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 5,876 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "paired interest") were exchanged for shares of Class A common stock, on a one-for-one basis.

F4 · shares: On August 16, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 5,876 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.

F12 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001209191-22-046791 · doc4.xml · derivative · entry 8

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,876

Underlying: Class A Common Stock · 5,876 shares

Expires not disclosed

F12 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F5 · shares: On August 16, 2022, pursuant to the terms of the LLC Agreement, 5,876 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 5,876 Paired Interests.

F12 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F12 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

SEC source: 0001209191-22-046791 · doc4.xml · derivative · entry 7

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 617,841

Underlying: Class A Common Stock · 5,876 shares

Expires not disclosed

F11 · 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.

F12 · derivative.exercise_price: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · 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.

F12 · date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F5 · shares: On August 16, 2022, pursuant to the terms of the LLC Agreement, 5,876 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 5,876 Paired Interests.

F11 · 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.

F12 · derivative.exercise_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

F11 · 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.

F12 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sales (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

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

SEC source: 0001209191-22-046791 · doc4.xml · nonDerivative · entry 4

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,286

F6 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 14, 2022.

F7 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $24.75 to $24.87 per share. The reporting person will provide to the Issuer, or the Securities and Exchange Commission staff, upon request, information regarding the number of shares sold at each price within the range.

F3 · balance_after: Includes 5,286 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-22-046791 · doc4.xml · nonDerivative · entry 3

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,465

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 August 16, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 5,876 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 August 16, 2022, pursuant to the terms of the LLC Agreement, 5,876 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 5,876 Paired Interests.

F3 · balance_after: Includes 5,286 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-22-046791 · doc4.xml · nonDerivative · entry 2

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,589

F1 · shares: On August 16, 2022, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 303 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 303 shares of Class A common stock of the Issuer ("Class A common stock").

F3 · balance_after: Includes 5,286 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the Issuer through each vesting date.

SEC source: 0001209191-22-046791 · doc4.xml · nonDerivative · entry 1

Whittenburg Mark G · CIK 0001866737 · General Counsel and Secretary

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 60

F1 · shares: On August 16, 2022, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 303 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 303 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: 0001209191-23-018946 · doc5.xml · nonDerivative · entry 1

Gipson Dennis G · CIK 0001866536 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,393

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of stockholders to be held in 2023 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

SEC source: 0001209191-23-018945 · doc5.xml · nonDerivative · entry 1

Castellano James G · CIK 0001866541 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,393

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of stockholders to be held in 2023 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

SEC source: 0001209191-23-018948 · doc5.xml · nonDerivative · entry 1

MAZZARELLA KATHLEEN M · CIK 0001273233 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,393

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of stockholders to be held in 2023 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

SEC source: 0001209191-23-018950 · doc5.xml · nonDerivative · entry 1

NEWMAN MARGARET · CIK 0001579754 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,393

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of stockholders to be held in 2023 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

SEC source: 0001209191-23-018943 · doc5.xml · nonDerivative · entry 1

Amirthalingam Bhavani · CIK 0001733097 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,591

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of stockholders to be held in 2023 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

SEC source: 0001209191-23-018947 · doc5.xml · nonDerivative · entry 1

Kimbrough Orvin T · CIK 0001867452 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,393

F1 · shares: Represents restricted stock units granted as director compensation. The restricted stock units will vest upon the earlier to occur of the one year anniversary of the grant date or the Issuer's next annual meeting of stockholders to be held in 2023 and be settled in shares of Class A common stock, subject to the reporting person's continued service as a director of the Issuer.

SEC source: 0001209191-22-033267 · doc4.xml · derivative · entry 6

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 30,000 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.

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

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

F1 · kind: On May 27, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 30,000 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 May 27, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 30,000 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.

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

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

SEC source: 0001209191-22-033267 · doc4.xml · derivative · entry 5

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,000

Underlying: Class A Common Stock · 30,000 shares

Expires not disclosed

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

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

F2 · shares: On May 27, 2022, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 30,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 30,000 Paired Interests.

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

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

SEC source: 0001209191-22-033267 · doc4.xml · derivative · entry 4

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 415,135

Underlying: Class A Common Stock · 30,000 shares

Expires not disclosed

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

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

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

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

F2 · shares: On May 27, 2022, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 30,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 30,000 Paired Interests.

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

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

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

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

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

SEC source: 0001209191-22-033267 · doc4.xml · nonDerivative · entry 2

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,146

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 April 11, 2022.

F5 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $25.00 to $25.18 per share. The reporting person will provide to the Issuer, or the Securities and Exchange Commission staff, upon request, information regarding the number of shares sold at each price within the range.

F3 · balance_after: Includes 4,146 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date.

SEC source: 0001209191-22-033267 · doc4.xml · nonDerivative · entry 1

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,146

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

F1 · kind: On May 27, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 30,000 shares of Class B common stock of the Issuer ("Class B common stock") and limited partnership interests of Core & Main Holdings, LP (together, a "Paired Interest") were exchanged for shares of Class A common stock of the Issuer ("Class A common stock"), on a one-for-one basis.

F2 · shares: On May 27, 2022, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 30,000 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 30,000 Paired Interests.

F3 · balance_after: Includes 4,146 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date.

SEC source: 0001209191-22-030109 · doc4.xml · derivative · entry 12

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 7,400 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.

F12 · 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.

F12 · 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 · kind: On May 17, 2022, pursuant to the terms of the Exchange Agreement, 7,400 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F8 · shares: On May 17, 2022, pursuant to the terms of the Exchange Agreement, 7,400 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F12 · 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.

F12 · 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: 0001209191-22-030109 · doc4.xml · derivative · entry 11

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,400

Underlying: Class A Common Stock · 7,400 shares

Expires not disclosed

F12 · 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.

F12 · 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 · shares: On May 17, 2022, pursuant to the terms of the LLC Agreement, 7,400 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F12 · 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.

F12 · 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: 0001209191-22-030109 · doc4.xml · derivative · entry 10

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 445,135

Underlying: Class A Common Stock · 7,400 shares

Expires not disclosed

F11 · 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.

F12 · 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: 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.

F12 · 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 · shares: On May 17, 2022, pursuant to the terms of the LLC Agreement, 7,400 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F11 · 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.

F12 · 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: 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.

F12 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

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

SEC source: 0001209191-22-030109 · doc4.xml · nonDerivative · entry 6

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,146

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 April 11, 2022.

F10 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $22.00 to $22.26 per share. The reporting person will provide to the Issuer, or the Securities and Exchange Commission staff, upon request, information regarding the number of shares sold at each price within the range.

F3 · balance_after: Includes 4,146 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date.

SEC source: 0001209191-22-030109 · doc4.xml · nonDerivative · entry 5

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,546

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

F8 · kind: On May 17, 2022, pursuant to the terms of the Exchange Agreement, 7,400 Paired Interests were exchanged for shares of Class A common stock, on a one-for-one basis.

F9 · shares: On May 17, 2022, pursuant to the terms of the LLC Agreement, 7,400 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for Paired Interests, on a one-for-one basis.

F3 · balance_after: Includes 4,146 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date.

SEC source: 0001209191-22-030109 · doc4.xml · derivative · entry 9

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 2,389 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.

F12 · 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.

F12 · 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 May 16, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 2,389 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 May 16, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 2,389 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.

F12 · 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.

F12 · 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: 0001209191-22-030109 · doc4.xml · derivative · entry 8

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,389

Underlying: Class A Common Stock · 2,389 shares

Expires not disclosed

F12 · 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.

F12 · 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 May 16, 2022, pursuant to the terms of the LLC Agreement, 2,389 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 2,389 Paired Interests.

F12 · 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.

F12 · 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: 0001209191-22-030109 · doc4.xml · derivative · entry 7

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 452,535

Underlying: Class A Common Stock · 2,389 shares

Expires not disclosed

F11 · 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.

F12 · 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: 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.

F12 · 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 May 16, 2022, pursuant to the terms of the LLC Agreement, 2,389 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 2,389 Paired Interests.

F11 · 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.

F12 · 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: 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.

F12 · derivative.expiration_date: Pursuant to the terms of the Exchange Agreement, Paired Interests are exchangeable at the discretion of the reporting person for shares of Class A common stock on a one-for-one basis or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of Class A common stock sold in such public offering or private sale, net of any underwriting discounts and commissions, for each limited partnership interest exchanged, subject to certain exceptions, conditions and adjustments). The Class B common stock and limited partnership interests have no expiration date.

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

SEC source: 0001209191-22-030109 · doc4.xml · nonDerivative · entry 4

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,146

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 April 11, 2022.

F7 · price: The price reported represents the weighted average price of shares of Class A common stock sold in multiple transactions at prices ranging from $22.00 to $22.74 per share. The reporting person will provide to the Issuer, or the Securities and Exchange Commission staff, upon request, information regarding the number of shares sold at each price within the range.

F3 · balance_after: Includes 4,146 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date.

SEC source: 0001209191-22-030109 · doc4.xml · nonDerivative · entry 3

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,746

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 May 16, 2022, pursuant to the terms of an exchange agreement, dated as of July 22, 2021 (as amended, the "Exchange Agreement"), 2,389 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 May 16, 2022, pursuant to the terms of the LLC Agreement, 2,389 vested Units held directly by the reporting person were redeemed at the discretion of the reporting person for 2,389 Paired Interests.

F3 · balance_after: Includes 4,146 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date.

SEC source: 0001209191-22-030109 · doc4.xml · nonDerivative · entry 2

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,357

F1 · shares: On May 16, 2022, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 211 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 211 shares of Class A common stock of the Issuer ("Class A common stock").

F3 · balance_after: Includes 4,146 restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of Class A common stock. The RSUs vest in three equal installments on March 11, 2023, March 11, 2024 and March 11, 2025, subject to the reporting person's remaining employed with the issuer through each vesting date.

SEC source: 0001209191-22-030109 · doc4.xml · nonDerivative · entry 1

Giles Jeffrey D · CIK 0001866555 · VP, Corporate Department

10b5-1 filing: Not disclosed

Ownership: Indirect · By LLC

Disclosed balance after: 54

F1 · shares: On May 16, 2022, pursuant to the terms of the Third Amended and Restated LLC Agreement of Core & Main Management Feeder, LLC ("Management Feeder"), dated as of July 22, 2021 (as amended, the "LLC Agreement"), 211 vested common units ("Units") held directly by the reporting person were redeemed at the discretion of the reporting person for 211 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.