X0508 4 2025-11-17 0 0001776909 CuriosityStream Inc. CURI 0001938940 Hayden Phillip Brady 8484 GEORGIA AVENUE SUITE 700 SILVER SPRING MD 20910 0 1 0 0 Chief Financial Officer 1 Common Stock 2025-11-17 4 S 0 1343 4.50 D 121141 I Held by P. Brady Hayden Revocable Trust, of which Mr. Hayden is the trustee. Common Stock 25000 I Held by Plan Z, LLC, of which Mr. Hayden is managing member. Shares sold pursuant to a 10b5-1 plan which Mr. Hayden entered into on May 30, 2025. The reporting person is trustee of the trust, and the reporting person is the sole beneficiary of the trust. The reporting person remains the beneficial owner of the securities held by the trust. /s/ P. Brady Hayden 2025-11-17