Inhibrx director trust sells 1,000 shares

A director-associated revocable trust reported two small September 2026 sales of INBX common stock, with no post-transaction holdings disclosed.

Rhea-AI Filing Summary

Inhibrx Biosciences, Inc. (INBX) director Kimberly Manhard reported indirect sales of common stock held by the Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012. The trust sold 500 shares on September 8, 2026 at $115.14 per share and 500 shares on September 9, 2026 at $115.795 per share. Manhard, as trustee, may be deemed to indirectly beneficially own the trust’s shares, and no Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Net Seller: 1,000 shares

Net Sell 2 txns

Insider MANHARD KIMBERLY

Role Director

Sold 1,000 shs ($115K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	500	$115.795	$58K
Sale	Common Stock F1	500	$115.14	$58K

Holdings After Transaction: Common Stock — 9,000 shares (Indirect, Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012)

Footnotes (1)

1. F1. These securities are directly owned by the Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012. Kimberly Manhard is a trustee of the Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012 and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012.

Key Figures

Shares sold September 8, 2026: 500 shares Price per share September 8, 2026: $115.14 per share Shares sold September 9, 2026: 500 shares +2 more

5 metrics

Shares sold September 8, 2026 500 shares Indirect sale of INBX common stock by revocable trust

Price per share September 8, 2026 $115.14 per share Indirect sale of 500 INBX common shares by revocable trust

Shares sold September 9, 2026 500 shares Indirect sale of INBX common stock by revocable trust

Price per share September 9, 2026 $115.795 per share Indirect sale of 500 INBX common shares by revocable trust

Total shares sold 1,000 shares Combined INBX common shares sold across both reported transactions

Key Terms

indirect beneficially own, Revocable Trust, open market or private transaction

3 terms

indirect beneficially own financial

"may be deemed to indirectly beneficially own the securities owned"

Revocable Trust financial

"Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012"

A revocable trust is a legal arrangement where the person who creates it keeps control and can change or cancel the trust at any time, while naming who will manage and receive the assets later. Think of it like a flexible folder for your investments and property that can be relabeled or reworked as circumstances change; it matters to investors because it determines how ownership is recorded, how easily assets transfer on incapacity or death, and whether holdings bypass public probate proceedings.

open market or private transaction financial

"Sale in open market or private transaction"

FAQ

What insider transactions were reported for INBX in this Form 4?

The filing reports that a revocable trust associated with director Kimberly Manhard sold 500 INBX common shares on September 8, 2026 and 500 shares on September 9, 2026.

At what prices were the INBX shares sold in Kimberly Manhard’s Form 4?

The revocable trust sold 500 INBX shares at $115.14 per share on September 8, 2026 and 500 shares at $115.795 per share on September 9, 2026.

Were the INBX shares sold directly by Kimberly Manhard?

No. The securities are directly owned by the Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012. Kimberly Manhard is a trustee and may be deemed to indirectly beneficially own the trust’s shares.

Does the Form 4 for INBX indicate a Rule 10b5-1 trading plan?

No. The filing indicates no Rule 10b5-1 trading plan for these transactions, meaning the sales are not affirmed as made under a pre-arranged trading plan.

How many INBX shares were sold in total in this Form 4?

The revocable trust associated with director Kimberly Manhard sold a total of 1,000 INBX common shares across two transactions reported for September 8 and 9, 2026.

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Available on EDGAR 09/10/2026 - 07:06 PM Accepted by SEC EDGAR 09/10/2026 - 07:06 PM Learn about SEC filing dates

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

MANHARD KIMBERLY

(Last) (First) (Middle)

C/O INHIBRX BIOSCIENCES, INC.

11025 NORTH TORREY PINES ROAD, SUITE 140

(Street)

LA JOLLA CALIFORNIA 92037

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Inhibrx Biosciences, Inc. [ INBX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	09/08/2026		S		500	D	$115.14	9,500	I	Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012(1)
Common Stock	09/09/2026		S		500	D	$115.795	9,000	I	Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012(1)

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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

Explanation of Responses:

1. These securities are directly owned by the Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012. Kimberly Manhard is a trustee of the Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012 and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012.

Remarks:

	/s/ Kelly D. Deck, as attorney-in-fact for Kimberly Manhard	09/10/2026
	** Signature of Reporting Person	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).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)