X0508 4 2025-12-15 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 2025-12-15 4 S 0 2000 4.59 D 119141 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. Restricted Stock Units Common Stock 70000 70000 D 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. On July 25, 2025 ("Grant Date"), the Company granted Mr. Hayden 70,000 restricted stock units ("RSUs") under the Company's 2020 Omnibus Incentive Plan. Each RSU represents a contingent right to receive one share of common stock. The RSUs are performance-based and will vest in four tranches of 17,500 each upon the date the Board determines that the applicable performance condition has been achieved. In the event that the Performance Conditions are not met, the RSUs granted will vest in four equal installments of 17,500 on each on the first, second, third and fourth anniversaries of the Grant Date, and will be settled upon vesting (or within 30 days thereafter). All vesting events are subject to continued employment on each applicable vesting date. /s/ P. Brady Hayden 2025-12-15