X0206 3 2021-07-23 0 0001856525 Core & Main, Inc. CNM 0001759120 CD&R Investment Associates X, Ltd. C/O CLAYTON, DUBILIER & RICE, LLC 375 PARK AVENUE, 18TH FLOOR NEW YORK NY 10152 0 0 1 0 0001871836 CD&R Fund X Waterworks B1, L.P. C/O CLAYTON, DUBILIER & RICE, LLC 375 PARK AVENUE, 18TH FLOOR NEW YORK NY 10152 0 0 1 0 0001871835 CD&R Fund X-A Waterworks B, L.P. C/O CLAYTON, DUBILIER & RICE, LLC 375 PARK AVENUE, 18TH FLOOR NEW YORK NY 10152 0 0 1 0 0001871833 CD&R Waterworks Holdings, L.P. C/O CLAYTON, DUBILIER & RICE, LLC 375 PARK AVENUE, 18TH FLOOR NEW YORK NY 10152 0 0 1 0 0001728626 Core & Main Management Feeder, LLC 1830 CRAIG PARK COURT ST. LOUIS MO 63146 0 0 1 0 0001871834 CD&R Waterworks Holdings GP, Ltd. C/O CLAYTON, DUBILIER & RICE, LLC 375 PARK AVENUE, 18TH FLOOR NEW YORK NY 10152 0 0 1 0 0001871837 CD&R Fund X Advisor Waterworks B, L.P. C/O CLAYTON, DUBILIER & RICE, LLC 375 PARK AVENUE, 18TH FLOOR NEW YORK NY 10152 0 0 1 0 0001874292 CD&R Waterworks Holdings, LLC C/O CLAYTON, DUBILIER & RICE, LLC 375 PARK AVENUE, 18TH FLOOR NEW YORK NY 10152 0 0 1 0 Class A Common Stock 730478 I By Affiliate Class A Common Stock 110828476 I By Affiliate Class A Common Stock 8341928 I By Affiliate Class A Common Stock 41847 I By Affiliate Class A Common Stock 8153 I By Affiliate Class B Common Stock and Limited Partnership Interests Class A Common Stock 71854015 I By Affiliate Class B Common Stock and Limited Partnership Interests Class A Common Stock 13999368 I By Affiliate Represents securities held by CD&R Fund X Advisor Waterworks B, L.P. ("Fund X Advisor B"). CD&R Waterworks Holdings GP, Ltd. ("CD&R Waterworks Holdings GP"), as the general partner of each of Fund X Advisor B, Fund X B1 and Fund X-A B (collectively, the "CD&R Blocker Fund AIVs"), CD&R Associates X Waterworks, L.P. ("CD&R Associates X"), as the sole shareholder of CD&R Waterworks Holdings GP, and CD&R Investment Associates X, Ltd. ("CD&R Investment Associates"), as the general partner of CD&R Associates X, may be deemed to beneficially own the securities held by the CD&R Blocker Fund AIVs. Each of CD&R Waterworks Holdings GP, CD&R Associates X and CD&R Investment Associates expressly disclaims beneficial ownership of the securities held by the CD&R Blocker Fund AIVs, except to the extent of its pecuniary interest therein. Represents securities held by CD&R Fund X Waterworks B1, L.P. ("Fund X B1"). Represents securities held by CD&R Fund X-A Waterworks B, L.P. ("Fund X-A B"). Represents securities held by CD&R Waterworks Holdings, LLC ("Waterworks Holdings"). CD&R Waterworks Holdings, L.P. ("Waterworks Holdings, L.P."), as the sole member and manager of Waterworks Holdings, CD&R Waterworks Holdings GP, as the general partner of Waterworks Holdings, L.P., CD&R Associates X, as the sole shareholder of CD&R Waterworks Holdings GP, and CD&R Investment Associates, as the general partner of CD&R Associates X, may be deemed to beneficially own the securities held by Waterworks Holdings. Each of Waterworks Holdings, L.P., CD&R Waterworks Holdings GP, CD&R Associates X and CD&R Investment Associates expressly disclaims beneficial ownership of the securities held by Waterworks Holdings, except to the extent of its pecuniary interest therein. Represents securities held by Core & Main Management Feeder, LLC ("Management Feeder") on behalf of holders of common units of Management Feeder (the "Common Units"). Pursuant to the terms of, and subject to the restrictions and conditions set forth in, the Third Amended and Restated Limited Liability Company Agreement of Management Feeder, vested Common Units are redeemable at the discretion of the holder for limited partnership interests of Core & Main Holdings, LP and shares of Class B common stock of the Issuer on a one-for-one basis, and have no expiration date. Upon a redemption of Common Units, a holder will also receive a distribution of the Class A common stock allocated to those Common Units. CD&R Waterworks Holdings GP, as the manager of Management Feeder, CD&R Associates X, as the sole shareholder of CD&R Waterworks Holdings GP, and CD&R Investment Associates, as the general partner of CD&R Associates X, may be deemed to beneficially own the securities held by Management Feeder. Each of CD&R Waterworks Holdings GP, CD&R Associates X and CD&R Investment Associates expressly disclaims beneficial ownership of the securities held by Management Feeder, except to the extent of its pecuniary interest therein. Pursuant to the terms of an exchange agreement, dated as of July 22, 2021, limited partnership interests of Core & Main Holdings, LP, together with a corresponding number of shares of Class B common stock of the Issuer, held by the reporting persons are exchangeable at the discretion of the reporting person for shares of the Issuer's Class A common stock on a one-for-one basis, or, at the election of a majority of the disinterested members of the Issuer's board of directors, for cash from a substantially concurrent public offering or private sale (based on the price of the Issuer's Class A common stock sold in such public offering or private sale), net of any underwriting discounts and commissions, for each partnership interest exchanged, subject to certain exceptions, conditions and adjustments, and have no expiration date. CD&R Investment Associates X, Ltd.; by: /s/ Rima Simson, Vice President, Treasurer & Secretary 2021-07-23 CD&R Fund X Waterworks B1, L.P.; by: CD&R Waterworks Holdings GP, Ltd., the GP; by: /s/ Rima Simson, Vice President, Treasurer & Secretary 2021-07-23 CD&R Fund X-A Waterworks B, L.P.; by: CD&R Waterworks Holdings GP, Ltd., the GP; by: /s/ Rima Simson, Vice President, Treasurer & Secretary 2021-07-23 CD&R Waterworks Holdings, L.P.; by: CD&R Waterworks Holdings GP, Ltd., the GP; by: /s/ Rima Simson, Vice President, Treasurer & Secretary 2021-07-23 Core & Main Management Feeder, LLC; by: /s/ Mark Witkowski, Vice President 2021-07-23 CD&R Waterworks Holdings GP, Ltd.; by: /s/ Rima Simson, Vice President, Treasurer & Secretary 2021-07-23 CD&R Fund X Advisor Waterworks B, L.P.; by: CD&R Waterworks Holdings GP, Ltd., the GP; by: /s/ Rima Simson, Vice President, Treasurer & Secretary 2021-07-23 CD&R Waterworks Holdings, LLC; by CD&R Waterworks Holdings, L.P., the Manager; by CD&R Waterworks Holdings GP, Ltd., the GP; by: /s/ Rima Simson, Vice President, Treasurer & Secretary 2021-07-23