X0508 4 2025-12-09 0 0002079999 Cardinal Infrastructure Group Inc. CDNL 0002092830 Spivey Jeremy Simmons C/O CARDINAL INFRASTRUCTURE GROUP INC. 100 E. SIX FORKS ROAD, #300 RALEIGH NC 27609 1 1 1 0 Chief Executive Officer 0 Class B Common Stock 2025-12-09 4 A 0 13481984 A 13481984 D Class B Common Stock 2025-12-11 4 D 0 3302980 D 10179004 D Class B Common Stock 2025-12-09 4 A 0 2716320 A 2716320 I By Spivey Family 2024 Irrevocable Trust U/A dated 5/13/24, as amended Class B Common Stock 2025-12-11 4 D 0 665476 D 2050844 I By Spivey Family 2024 Irrevocable Trust U/A dated 5/13/24, as amended LLC Units 2025-12-09 4 A 0 13481984 A Class A Common Stock 13481984 13481984 D LLC Units 2025-12-11 4 D 0 3302980 21.00 D Class A Common Stock 3302980 10179004 D LLC Units 2025-12-09 4 A 0 2716320 A Class A Common Stock 2716320 2716320 I By Spivey Family 2024 Irrevocable Trust U/A dated 5/13/24, as amended LLC Units 2025-12-11 4 D 0 665476 21.00 D Class A Common Stock 665476 2050844 I By Spivey Family 2024 Irrevocable Trust U/A dated 5/13/24, as amended Represents securities received as part of the Issuer's reorganization in connection with its initial public offering, as described in the registration statement on Form S-1 relating to the initial public offering. These securities were previously reported on a Form 3 filed by the Reporting Person. Reflects the cancellation for no consideration of Class B Common Stock in connection with the redemption of the membership units of Cardinal Civil Contracting Holdings LLC (the "LLC Units"). The Reporting Person is the spouse of the trustee of Spivey Family 2024 Irrevocable Trust U/A dated 5/13/24, as amended ("Spivey Trust"), and as a result, may be deemed to share beneficial ownership of the securities held of record by Spivey Trust. The LLC Units may be redeemed by the Reporting Person at any time at the option of the holder for shares of Class A Common Stock on a 1-to-1 basis, and a corresponding number of shares of Class B Common Stock will be forfeited in connection with the redemption. The LLC Units have no expiration date. /s/ Tiffany Gidley, Attorney-in-fact 2025-12-11