X0508 4 2025-11-11 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 0 Common Stock 2025-11-11 4 M 0 101667 A 101667 D Common Stock 2025-11-12 4 G 0 101667 D 0 D Common Stock 2025-11-12 4 G 0 101667 A 122484 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 2025-11-11 4 M 0 101667 D Common Stock 101667 0 D On October 9, 2024, the Company granted Brady Hayden 152,500 performance-based restricted stock units ("RSUs") under the 2020 Omnibus Incentive Plan (the "Award"). Each RSU represents a contingent right to receive one share of common stock. On May 7, 2025, the Board determined that the Company met the first performance condition of the Award, for having then achieved more than $4,500,000 in adjusted free cash flow since October 1, 2024, and thereby triggering the vesting of one-third of the Award, or 50,833 RSUs. On November 11, 2025, the Board determined that the Company met the second performance condition of the Award, by achieving more than $9,000,000 in adjusted free cash flow between October 1, 2024 and September 30, 2025, and thereby triggering the vesting of two-thirds of the Award, or 101,667 RSUs. Reflects the exempt transfer of 101,667 shares from Mr. Hayden to P. Brady Hayden Revocable Trust on November 12, 2025 for no consideration. 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 2025-11-13