Inhibrx Biosciences director plans 500-share sale

A company director, via a revocable trust, has filed to sell a 500-share block of INBX common stock under Rule 144, following several similar-sized sales in recent months.

Rhea-AI Filing Summary

Inhibrx Biosciences, Inc. (INBX) discloses that director Kimberly Manhard, through the Kimberly Joan Manhard Revocable Trust and using Fidelity Brokerage Services LLC, has filed a notice to sell 500 shares of common stock. The shares were acquired on August 28, 2024 in an open market purchase and are to be sold for cash, with recent prior sales of 500-share blocks reported over the past three months.

Key Figures

Planned sale shares: 500 shares Aggregate value reference for planned sale: $55,130.00 Shares outstanding reference: 14,717,660 shares +5 more

8 metrics

Planned sale shares 500 shares Common stock to be sold for cash under the Form 144 notice

Aggregate value reference for planned sale $55,130.00 Value listed for 500 shares of common stock in the securities information section

Shares outstanding reference 14,717,660 shares Share count referenced for Inhibrx Biosciences, Inc. common stock

Recent sale on September 8, 2026 500 shares for $57,570.00 Sale by Kimberly Joan Manhard Revocable Trust

Recent sale on September 9, 2026 500 shares for $57,897.50 Sale by Kimberly Joan Manhard Revocable Trust

Recent sale on September 11, 2026 500 shares for $55,887.50 Sale by Kimberly Joan Manhard Revocable Trust

Acquisition date of shares to be sold August 28, 2024 Shares acquired in an open market purchase from the issuer

Date of notice September 14, 2026 Date the Form 144 notice was signed and filed

Key Terms

Rule 144, Open Market Purchase, Revocable Trust, Common

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Open Market Purchase financial

"Common | 08/28/2024 | Open Market Purchase | Issuer"

An open market purchase is when a company buys its own shares on public stock exchanges the same way any investor would, rather than through a private deal. Investors care because these purchases reduce the number of shares available, can boost earnings per share and share price, signal that management thinks the stock is undervalued, and use company cash that might otherwise go to reinvestment or dividends — like a business quietly buying back its own tickets at the box office.

Revocable Trust financial

"Kimberly Joan Manhard Revoc Tr 11025 N. Torrey Pines Road"

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.

Common financial

"Common | Fidelity Brokerage Services LLC"

FAQ

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

What does the Form 144 filing report for Inhibrx Biosciences, Inc. (INBX)?

It reports that director Kimberly Manhard, via a revocable trust, has filed to sell 500 shares of INBX common stock for cash through Fidelity Brokerage Services LLC, with the shares originally acquired on August 28, 2024 in an open market purchase.

How many INBX shares are covered by the new planned sale?

The notice covers a planned sale of 500 shares of Inhibrx Biosciences, Inc. common stock. The filing lists these shares with an aggregate value reference of $55,130.00 in the securities information section.

What recent INBX share sales by the same seller are disclosed?

The filing lists three recent sales by the Kimberly Joan Manhard Revocable Trust: 500 shares on September 8, 2026 for $57,570.00, 500 shares on September 9, 2026 for $57,897.50, and 500 shares on September 11, 2026 for $55,887.50.

Who is the beneficial owner associated with this INBX Form 144?

The person for whose account the securities are to be sold is Kimberly Manhard. The filing notes that the sale took place in the Kimberly Joan Manhard Revocable Trust account, where she serves as a trustee.

Which broker is handling the INBX shares covered by this Form 144?

The common stock is held and the transaction is handled through Fidelity Brokerage Services LLC, identified with its Smithfield, Rhode Island address in the securities information section.

What is the stated total number of INBX shares referenced as outstanding in the filing?

The securities information section references 14,717,660 shares of Inhibrx Biosciences, Inc. common stock, presented in connection with the Form 144 notice. This figure is provided as a share count context in the form.

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

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Available on EDGAR 09/14/2026 - 05:00 PM Accepted by SEC EDGAR 09/14/2026 - 04:57 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001202094
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Inhibrx Biosciences, Inc.
SEC File Number	001-42031
Address of Issuer	11025 N. TORREY PINES ROAD, SUITE 140 LA JOLLA CALIFORNIA 92037
Phone	(858) 795-4220
Name of Person for Whose Account the Securities are To Be Sold	MANHARD KIMBERLY
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	500	55130.00	14717660	09/14/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	08/28/2024	Open Market Purchase	Issuer			500	08/28/2024	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Kimberly Joan Manhard Revoc Tr 11025 N. Torrey Pines Road Suite 140 La Jolla CA 92037	Common	09/08/2026	500	57570.00
Kimberly Joan Manhard Revoc Tr 11025 N. Torrey Pines Road Suite 140 La Jolla CA 92037	Common	09/09/2026	500	57897.50
Kimberly Joan Manhard Revoc Tr 11025 N. Torrey Pines Road Suite 140 La Jolla CA 92037	Common	09/11/2026	500	55887.50

144: Remarks and Signature

Remarks	The sale today took place in the Kimberly Joan Manhard Revocable Trust account in which Kimberly Manhard is a trustee.
Date of Notice	09/14/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Joshua Schmitt, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Kimberly Manhard.
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)