Inhibrx director trust sells 1,500 shares

A director-related trust reported selling 1,500 INBX common shares over three days in mid-September 2026.

Rhea-AI Filing Summary

Inhibrx Biosciences, Inc. (INBX) reported that director Kimberly Manhard, through the Kimberly Joan Manhard Revocable Trust dated June 4, 2012, sold a total of 1,500 shares of common stock in open market or private transactions on September 11, 14, and 15, 2026 at prices between $105.05 and $111.78 per share. The sales were reported as indirect ownership transactions by the trust, for which Ms. Manhard may be deemed to beneficially own the securities as trustee.

Insider Trade Summary

Net Seller: 1,500 shares

Net Sell 3 txns

Insider MANHARD KIMBERLY

Role Director

Sold 1,500 shs ($164K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	500	$105.05	$53K
Sale	Common Stock F1	500	$110.26	$55K
Sale	Common Stock F1	500	$111.775	$56K

Holdings After Transaction: Common Stock — 7,500 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

Total shares sold: 1,500 shares Sale price on September 11, 2026: $111.7750 per share Sale price on September 14, 2026: $110.2600 per share +1 more

4 metrics

Total shares sold 1,500 shares Aggregate common shares sold by the Manhard trust in September 2026 transactions

Sale price on September 11, 2026 $111.7750 per share 500 INBX common shares sold indirectly by the Manhard trust

Sale price on September 14, 2026 $110.2600 per share 500 INBX common shares sold indirectly by the Manhard trust

Sale price on September 15, 2026 $105.0500 per share 500 INBX common shares sold indirectly by the Manhard trust

Key Terms

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

3 terms

indirectly beneficially own financial

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

Revocable Trust financial

"These securities are directly owned by the Kimberly Joan Manhard Revocable Trust"

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

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider trading activity did INBX disclose in this Form 4?

The filing reports that a trust associated with director Kimberly Manhard sold 1,500 shares of Inhibrx Biosciences common stock in three separate transactions on September 11, 14, and 15, 2026.

At what prices were the INBX shares sold in this Form 4?

The 1,500 INBX shares were sold at per-share prices of $111.7750 on September 11, $110.2600 on September 14, and $105.0500 on September 15, 2026, in open market or private transactions.

Who actually owns the INBX shares reported in this Form 4?

The shares are directly owned by the Kimberly Joan Manhard Revocable Trust, dated June 4, 2012. As trustee, Kimberly Manhard may be deemed to indirectly beneficially own the securities held by the trust.

Is the insider trading in INBX under a Rule 10b5-1 trading plan?

No Rule 10b5-1 trading plan is indicated. The document-level checkbox for Rule 10b5-1 is unchecked, and the footnotes do not describe any pre-arranged trading plan for these transactions.

Are the INBX sales reported as direct or indirect ownership changes?

All three transactions are reported as changes in indirect ownership, because the common stock is held by the Kimberly Joan Manhard Revocable Trust rather than directly by Kimberly Manhard.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/15/2026 - 05:53 PM Accepted by SEC EDGAR 09/15/2026 - 05:52 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)
09/11/2026

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	09/11/2026		S		500	D	$111.775	8,500	I	Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012(1)
Common Stock	09/14/2026		S		500	D	$110.26	8,000	I	Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012(1)
Common Stock	09/15/2026		S		500	D	$105.05	7,500	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	09/15/2026
	** 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)