Sec Form 4 Filing - Eckelman Brendan P. @ Inhibrx, Inc. - 2021-01-15

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 Eckelman Brendan P. 2. Issuer Name and Ticker or Trading Symbol Inhibrx, Inc. [ INBX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Scientific Officer (Last) (First) (Middle) C/O INHIBRX, INC., 11025 NORTH TORREY PINES ROAD, SUITE 200 3. Date of Earliest Transaction (MM/DD/YY) 01/15/2021 (Street) LA JOLLA, CA92037 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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 12/04/2020 G( 1 )( 2 ) V 160,000 D $ 0 2,589,953 I By the Eckelman Living Trust dated February 5, 2014 ( 3 ) Common Stock 12/04/2020 G( 1 ) V 80,000 A $ 0 80,000 I By trust Common Stock 12/04/2020 G( 2 ) V 80,000 A $ 0 80,000 I By trust

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) $ 33.63 01/15/2021 A 40,000 ( 4 ) 01/15/2021 Common Stock 40,000 $ 0 40,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Eckelman Brendan P. C/O INHIBRX, INC. 11025 NORTH TORREY PINES ROAD, SUITE 200 LA JOLLA, CA92037 X Chief Scientific Officer Eckelman Living Trust Dated February 5, 2014 C/O INHIBRX, INC. 11025 NORTH TORREY PINES ROAD, SUITE 200 LA JOLLA, CA92037 X Signatures /s/ Kelly D. Deck, attorney-in-fact 01/19/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )(1) This transaction involved a gift of 80,000 shares of Common Stock by the Eckelman Living Trust dated February 5, 2014 to a trust, for the benefit of the reporting person's son. ( 2 )(2) This transaction involved a gift of 80,000 shares of Common Stock by the Eckelman Living Trust dated February 5, 2014 to a trust, for the benefit of the reporting person's daughter. ( 3 )(3) These securities are directly owned by the Eckelman Living Trust dated February 5, 2014. Brendan P. Eckelman is the trustee of the Eckelman Living Trust dated February 5, 2014 and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Eckelman Living Trust dated February 5, 2014. ( 4 )(4) Twenty-five percent (25%) of the total shares subject to the stock option become exercisable on January 15, 2022, with the balance to vest and become exercisable in equal successive monthly installments for thirty-six (36) months thereafter.

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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