Form 4 Filing by Mark D. Walker

This filing details a transaction by Mark D. Walker, Chairman and CEO of Direct Digital Holdings, Inc. On December 4, 2025, Mr. Walker acquired 300,000 shares of Class A Common Stock, par value $0.001 per share, with the transaction code "A" indicating acquisition. The price per share was $0.0, as indicated by a footnote referencing an exchange agreement. Post-transaction, Mr. Walker holds 300,000 shares of Class A Common Stock. Additionally, the filing reports the disposal of 300,000 Class A Common Units of Direct Digital Holdings LLC, with a post-transaction balance of 4,861,500 units. These units are exchangeable for Class A Common Stock on a one-for-one basis, subject to certain conditions. The Class B Common Stock held by Mr. Walker, which has no economic value but carries voting rights, is cancelled upon such exchanges.