X0609 4 2026-08-28 0 0001776909 CuriosityStream Inc. CURI 0001827441 Stinchcomb Clinton Larry false 8484 GEORGIA AVE., SUITE 700 SILVER SPRING MD 20910 1 1 0 0 President and CEO 0 Common Stock 2026-08-28 4 P 0 20000 2.603 A 3021260 D The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.56 to $2.62, inclusive. The reporting person undertakes to provide to CuriosityStream Inc., any security holder of CuriosityStream Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote to this Form 4. /s/ P. Brady Hayden as attorney-in-fact for Clint Stinchcomb 2026-08-31