X0609 4 2026-03-26 0 0002079999 Cardinal Infrastructure Group Inc. CDNL 0001856646 Zelman Ivy false C/O CARDINAL INFRASTRUCTURE GROUP INC. 100 E. SIX FORKS ROAD, #300 RALEIGH NC 27609 1 0 0 0 0 Class A Common Stock 2026-03-26 4 P 0 6921 36.33 A 15326 D The price reported in Column 4 is a weighted average price. The shares were purchased in multiple transactions at prices ranging from $36.09 to $36.47, inclusive. The reporting person hereby undertakes to provide to Cardinal Infrastructure Group Inc., any security holder of Cardinal Infrastructure Group Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (1) of this Form 4. /s/ Tiffany Gidley, Attorney-in-Fact 2026-03-27