144 0001938940 XXXXXXXX LIVE 0001776909 CuriosityStream Inc. 001-39139 8484 GEORGIA AVE. SUITE 700 SILVER SPRING MD 20910 301-755-2050 Hayden Phillip Brady Officer Common Fidelity Brokerage Services LLC

900 Salem Street Smithfield RI 02917

2000 9180.00 58298507 12/15/2025 NASDAQ Common 12/12/2024 Open Market Purchase Issuer N 2000 12/12/2024 Cash N P. Brady Hayden Revocable Trust

8484 Georgia Ave Suite 700 Silver Spring MD 20910

Common 11/06/2025 17508 67754.34 P. Brady Hayden Revocable Trust

8484 Georgia Ave Suite 700 Silver Spring MD 20910

Common 11/17/2025 1343 6043.50 Today's sale and the sales taking place in the past 3 months occurred in the P. Brady Hayden Revocable Trust of which Phillip B Hayden is a trustee and account stakeholder. 12/15/2025 05/30/2025 /s/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Phillip B. Hayden