X0609 4 2026-09-01 0 0001776909 CuriosityStream Inc. CURI 0002154205 Piche Sean Adam false 8484 GEORGIA AVENUE, SUITE 700 SILVER SPRING MD 20910 0 1 0 0 Chief Financial Officer 0 Restricted Stock Units 2026-09-01 4 A 0 150000 0 A Common Stock 150000 150000 D On September 1, 2026, the Company granted Mr. Piche 150,000 RSUs under the Company's 2020 Omnibus Incentive Plan. The RSUs will vest in four tranches of 75,000 on the first anniversary, and 25,000 each on the second, third and fourth anniversaries of the grant date. This Form 4 is being filed late due to an inadvertent administrative delay and not through any fault of the reporting person. /s/ Tia Cudahy, Attorney-in-Fact for Sean Piche 2026-09-16