Inhibrx director trust plans sale of 500 shares

Director Kimberly Manhard’s revocable trust has filed to sell 500 INBX shares under Rule 144, following recent sales totaling 1,000 shares.

Rhea-AI Filing Summary

Inhibrx Biosciences, Inc. (INBX) has a Rule 144 notice filed on behalf of director Kimberly Manhard, covering a proposed sale of 500 shares of common stock held in the Kimberly Joan Manhard Revocable Trust. The notice reports that Inhibrx had 14,717,660 shares outstanding as of September 11, 2026. The trust also sold 500 shares for $57,570.00 on September 8, 2026 and 500 shares for $57,897.50 on September 9, 2026, indicating recent selling activity by the same trust account.

Key Figures

Shares to be sold: 500 shares Aggregate market value of shares to be sold: $55,887.50 Shares outstanding: 14,717,660 shares +2 more

5 metrics

Shares to be sold 500 shares Common stock covered by the Rule 144 notice

Aggregate market value of shares to be sold $55,887.50 Value associated with the 500 shares in the securities information section

Shares outstanding 14,717,660 shares Common shares outstanding as of September 11, 2026

Sale on September 8, 2026 500 shares for $57,570.00 Common stock sold by the trust during the past three months

Sale on September 9, 2026 500 shares for $57,897.50 Common stock sold by the trust during the past three months

Key Terms

Rule 144, Open Market Purchase, Revocable Trust, attorney-in-fact

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

"The sale today took place in the Kimberly Joan Manhard Revocable Trust account"

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.

attorney-in-fact regulatory

"as attorney-in-fact for Kimberly Manhard"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

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

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

The filing discloses a planned Rule 144 sale of 500 shares of Inhibrx Biosciences, Inc. common stock by the Kimberly Joan Manhard Revocable Trust, for which director Kimberly Manhard is trustee. It also lists Inhibrx’s 14,717,660 shares outstanding as of September 11, 2026.

Who is selling INBX shares in this Form 144 notice?

The seller is the Kimberly Joan Manhard Revocable Trust, with director Kimberly Manhard as trustee. The notice states that the sale reported for the date of the notice took place in this trust account.

How many Inhibrx (INBX) shares are intended to be sold under this Form 144?

The Form 144 reports an intent to sell 500 shares of Inhibrx common stock. These shares are held in the Kimberly Joan Manhard Revocable Trust and are to be sold for cash.

What past INBX share sales by the trust are reported in the last 3 months?

The trust sold 500 shares for $57,570.00 on September 8, 2026 and another 500 shares for $57,897.50 on September 9, 2026. These transactions are listed as securities sold during the past three months.

What is the reported market value of the INBX shares covered by this Form 144?

The Form 144 lists an aggregate market value of $55,887.50 for the 500 INBX shares covered by the notice. This figure appears in the securities information section associated with the proposed sale.

How many INBX shares were outstanding when this Form 144 was filed?

The notice reports that Inhibrx Biosciences, Inc. had 14,717,660 shares outstanding as of September 11, 2026. This serves as context for the relative size of the reported insider-related sales.

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

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Available on EDGAR 09/11/2026 - 01:16 PM Accepted by SEC EDGAR 09/11/2026 - 01:15 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	55887.50	14717660	09/11/2026	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 Trust 11025 N. Torrey Pines Road, Suite 140 La Jolla CA 92037	Common	09/08/2026	500	57570.00
Kimberly Joan Manhard Revoc Trust 11025 N. Torrey Pines Road, Suite 140 La Jolla CA 92037	Common	09/09/2026	500	57897.50

144: Remarks and Signature

Remarks	The sale today took place in the Kimberly Joan Manhard Revocable Trust account in which Kimberly Manhard is trustee.
Date of Notice	09/11/2026
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/ Daniel Tucci, 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)