X0202 SCHEDULE 13D/A 0002146263 XXXXXXXX LIVE 2 Common Stock 09/21/2026 false 0001419275 39366L406 RTB Digital, Inc.

3131 CAMINO DEL RIO NORTH, SUITE 1400 SAN DIEGO CA 92108

Anibal Pablo Escanellas 7874237119 200 Calle San Agustin San Juan PR 00901 0002146263 N Dorsett Jason Christopher PF N X1 4204028.00 0.00 4204028.00 0.00 4204028.00 N 30.0 IN Common Stock RTB Digital, Inc. 3131 CAMINO DEL RIO NORTH, SUITE 1400 SAN DIEGO CA 92108 Jason Christopher Dorsett 200 Calle San Agustin San Juan Puerto Rico 00901 The Reporting Person is a private investor and is self-employed. His principal business address is 200 Calle San Agustin, San Juan, Puerto Rico 00901, United States. During the past five years, the Reporting Person has not been convicted in any criminal proceeding, excluding traffic violations or similar misdemeanors. The Reporting Person has not, during the past five years, been subject to any judgment, decree, or final order involving violations of federal or state securities laws. United States of America On September 21, 2026, the Reporting Person used $91,520 of personal funds to purchase 11,000 shares of Common Stock at $8.32 per share. The Reporting Person acquired the shares for investment purposes. As of September 21, 2026, the Reporting Person beneficially owns 4,204,028 shares of Common Stock, representing approximately 30.0% of the outstanding Common Stock of the Issuer. The Reporting Person has sole voting power over 4,204,028 shares and sole dispositive power over 4,204,028 shares. The Reporting Person has no shared voting or shared dispositive power. On September 21, 2026, the Reporting Person purchased 11,000 shares of Common Stock in an open-market transaction at $8.32 per share using personal funds. Not applicable. Not applicable. No new contracts, arrangements, understandings or relationships were entered into in connection with this transaction. Not applicable. Dorsett Jason Christopher Anibal Pablo Escanellas Juan 09/23/2026