Sec Form 4 Filing - Reed Rebecca R @ CuriosityStream Inc. - 2025-05-07

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Reed Rebecca R 2. Issuer Name and Ticker or Trading Symbol CuriosityStream Inc. [ CURI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Gen Counsel (Last) (First) (Middle) 8484 GEORGIA AVE SUITE 700 3. Date of Earliest Transaction (MM/DD/YY) 05/07/2025 (Street) SILVER SPRING, MD20910 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/07/2025 M 13,333 A 35,393 D Common Stock 05/07/2025 F 4,672 ( 2 ) D $ 4.63 30,721 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Stock Units ( 1 ) 05/08/2025 M 13,333 ( 1 ) ( 1 ) Common Stock 13,333 ( 1 ) 26,667 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Reed Rebecca R 8484 GEORGIA AVE SUITE 700 SILVER SPRING, MD20910 Gen Counsel Signatures /s/ P. Brady Hayden as attorney-in-fact for Rebecca Reed 05/09/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On October 9, 2024, the Company granted Rebecca Reed 40,000 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, by achieving 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 13,333 RSUs. The second performance condition that would trigger vesting and distribution of the remaining two-thirds of the Award is confirmation by the Board that the Company achieved at least $9 million in adjusted free cash flow during the period October 1, 2024 through September 30, 2025. In the event that the second performance condition is not met, the remaining RSUs will be cancelled. Vesting is subject to continued employment on the vesting date. ( 2 )Represents the withholding of shares of the Company's common stock for tax purposes in connection with the vesting of restricted stock units previously granted.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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