Sec Form 4 Filing - MARIANI PETER J @ Cytosorbents Corp - 2024-08-14

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 MARIANI PETER J 2. Issuer Name and Ticker or Trading Symbol Cytosorbents Corp [ CTSO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Financial Officer (Last) (First) (Middle) C/O CYTOSORBENTS CORPORATION, 305 COLLEGE ROAD EAST 3. Date of Earliest Transaction (MM/DD/YY) 08/14/2024 (Street) PRINCETON, NJ08540 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 08/14/2024 A 110,000 ( 1 ) A $ 0 110,000 D Common Stock 08/14/2024 A 65,000 ( 2 ) A $ 0 175,000 D Common Stock 08/14/2024 A 175,000 ( 3 ) A $ 0 350,000 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 Stock Option (right to buy) $ 0.9 08/14/2024 A 80,000 ( 4 ) 08/14/2034 Common Stock 80,000 $ 0 80,000 D Stock Option (right to buy) $ 0.9 08/14/2024 A 215,000 ( 5 ) 08/14/2034 Common Stock 215,000 $ 0 215,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other MARIANI PETER J C/O CYTOSORBENTS CORPORATION 305 COLLEGE ROAD EAST PRINCETON, NJ08540 Chief Financial Officer Signatures /s/ Peter J. Mariani 08/16/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )These shares represent restricted stock units ("RSUs") received as a signing bonus that will be settled into common stock, par value $0.001 per share (the "Common Stock") upon vesting upon the earlier of (i) a "Change In Control" of CytoSorbents Corporation (the "Company"), as defined in the reporting person's employment agreement (the "Employment Agreement"), or (ii) the fourth anniversary from the date of grant, subject to the reporting person's continued service as of the applicable vesting date. ( 2 )These shares represent RSUs which shall vest as to one-half of the award on each of the first and second anniversaries of the date of grant, subject to the reporting person's continued service as of the applicable vesting date and will be settled into Common Stock upon vesting. ( 3 )These shares represent RSUs that will be settled into Common Stock upon a "Change In Control" of the Company, as defined in the reporting person's employment agreement, subject to the reporting person's continued service as of the applicable vesting date. ( 4 )The shares underlying these stock options vest in accordance with the following schedule: (i) 41,000 upon the six-month anniversary of the date of grant, and (ii) 13,000 on the one-year, two-year and three-year anniversaries of the date of grant, subject to the reporting person's continued service as of the applicable vesting date. ( 5 )The shares underlying these stock options will vest only upon the achievement of certain milestones pursuant to the terms of the Employment Agreement, subject to the reporting person's continued service as of the applicable vesting date.

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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