SC 13D 1 eh240491007_13d-kayyem.htm SCHEDULE 13D

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. )*

Inhibrx Biosciences, Inc.

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

45720N103

(CUSIP Number)

Jon Faiz Kayyem

c/o Inhibrx Biosciences, Inc.

11025 N. Torrey Pines Road, Suite 140

La Jolla, California 92037

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

May 29, 2024

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. ☐

*The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 45720N103

SCHEDULE 13D

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1	NAME OF REPORTING PERSON The Jon F. Kayyem and Paige Gates-Kayyem Family Trust
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a) ☐ (b) ☐
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)	☐
6	CITIZENSHIP OR PLACE OF ORGANIZATION United States

NUMBER OF

BENEFICIALLY

OWNED BY EACH

REPORTING PERSON

WITH

SOLE VOTING POWER

806,075

SHARED VOTING POWER

SOLE DISPOSITIVE POWER

806,075

SHARED DISPOSITIVE POWER

11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 806,075
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES	☐
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.56%(1)
14	TYPE OF REPORTING PERSON OO

(1)

Based on 14,475,904 shares of common stock, par value $0.0001 per share (the “Common Stock”), of Inhibrx Biosciences, Inc., a Delaware corporation (the “Issuer”), outstanding as of May 30, 2024.

CUSIP No. 45720N103

SCHEDULE 13D

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1	NAME OF REPORTING PERSON Jon Faiz Kayyem
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a) ☐ (b) ☐
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)	☐
6	CITIZENSHIP OR PLACE OF ORGANIZATION United States

NUMBER OF

BENEFICIALLY

OWNED BY EACH

REPORTING PERSON

WITH

SOLE VOTING POWER

SHARED VOTING POWER

818,575(1)

SOLE DISPOSITIVE POWER

SHARED DISPOSITIVE POWER

818,575(1)

11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 818,575
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES	☐
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.65%(2)
14	TYPE OF REPORTING PERSON IN

(1)

Consists of (i) 806,075 shares of Common Stock held by The Jon F. Kayyem Family Trust, of which Dr. Kayyem is the trustee, (ii) 6,250 shares of Common Stock held in a custodial account managed by the reporting person for the benefit of Dr. Kayyem’s immediate family, and (iii) 6,250 shares of Common Stock held in a custodial account managed by the reporting person for the benefit of Dr. Kayyem’s immediate family.

(2)

Based on 14,475,904 shares of the Issuer’s Common Stock outstanding as of May 30, 2024.

CUSIP No. 45720N103

SCHEDULE 13D

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Item 1.

Security and Issuer.

This Schedule 13D (this “Schedule 13D”) relates to the shares of the common stock, par value $0.0001 per share (the “Common Stock”), of Inhibrx Biosciences, Inc., a Delaware corporation (the “Issuer”). The address of the Issuer’s principal executive office is 11025 N. Torrey Pines Road, Suite 140, La Jolla, California 92037.

Item 2.

Identity and Background.

(a) This Schedule 13D is being filed on behalf of The Jon F. Kayyem and Paige Gates-Kayyem Family Trust (the “Trust”) and Jon Faiz Kayyem (“Dr. Kayyem”), as an individual. Each of the Trust and Dr. Kayyem may be referred to herein individually as a “Reporting Person” and collectively as the “Reporting Persons.”

The agreement between the Reporting Persons to file jointly in accordance with the provisions of Rule 13d-1(k)(1) under the Securities Act of 1933, as amended is filed with this Statement as Exhibit 99.1.

(b) The principal business address for each of the Reporting Persons is c/o Inhibrx Biosciences, Inc., 11025 N. Torrey Pines Road, Suite 140, La Jolla, California 92037.

(d) During the last five years, no Reporting Person has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) During the last five years, no Reporting Person has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and, as a result of such proceeding, was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f) The Trust was established under the laws of the United States of America. Dr. Kayyem is a citizen of the United States of America.

Item 3.

Source and Amount of Funds or Other Consideration.

On May 30, 2024, Inhibrx, Inc., a Delaware corporation, completed the transactions contemplated by the Agreement and Plan of Merger, dated as of January 22, 2024 (the “Merger Agreement”), by and among Aventis Inc., a Pennsylvania corporation (“Parent”) and wholly owned subsidiary of Sanofi S.A. (“Sanofi”), Art Acquisition Sub, Inc. (“Merger Sub”) and Inhibrx, Inc. Pursuant to the Merger Agreement, Merger Sub merged with and into Inhibrx, Inc. (the “Merger”), with Inhibrx, Inc. surviving the Merger as a wholly owned subsidiary of Parent.

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SCHEDULE 13D

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In connection with and as a condition to the Merger, on May 29, 2024, Inhibrx, Inc. completed the previously announced transactions pursuant to the Separation and Distribution Agreement, dated as of January 22, 2024 (the “Separation and Distribution Agreement”), by and among Inhibrx, Inc. and the Issuer, pursuant to, which, among other things, Inhibrx, Inc. distributed to its stockholders as of the distribution record date of May 17, 2024, 92% of the issued and outstanding shares of common stock of the Issuer, on a pro rata basis (the “Spin-Off”), at a ratio of one share of Common Stock for every four (4) shares of Inhibrx, Inc.’s issued and outstanding common stock, par value $0.0001 per share, held on the distribution record date. The Reporting Persons acquired the shares of Common Stock reported in this Schedule 13D in the Spin-Off.

Item 4.

Purpose of Transaction.

The information set forth under Item 3 above is incorporated by reference herein.

The Reporting Persons acquired the shares of the Common Stock reported in this Schedule 13D in the Spin-Off and holds such shares for investment purposes and intends to review such investment in the Issuer on a continuing basis. Consistent with such purposes, the Reporting Persons may engage in communications with, without limitation, one or more stockholders of the Issuer, management of the Issuer and/or one or more members of the board of directors of the Issuer and may make suggestions concerning the Issuer’s operations, prospects, business and financial strategies, strategic transactions, assets and liabilities, business and financing alternatives, the composition of the board of directors of the Issuer and such other matters as the Reporting Persons may deem relevant to their investment in the Issuer. The Reporting Persons expect that they will, from time to time, review their investment position in the shares of the Common Stock or the Issuer and may, depending on the Issuer’s performance and other market conditions, increase or decrease their investment position in the Common Stock. The Reporting Persons may, from time to time, make additional purchases of shares of the Common Stock either in the open market or in privately negotiated transactions, depending upon their evaluation of the Issuer’s business, prospects, financial condition and results of operations, the market for the Common Stock, other opportunities available to the Reporting Persons, general economic conditions, stock market conditions and other factors. Depending upon the factors noted above, the Reporting Persons may also decide to hold or dispose of all or part of their investment in the Common Stock and/or enter into derivative transactions with institutional counterparties with respect to the Issuer’s securities, including the Common Stock.

Any actions the Reporting Persons might undertake may be made at any time and from time to time without prior notice and will be dependent upon the Reporting Person’s review of numerous factors, including, but not limited to: an ongoing evaluation of the Issuer’s business, financial condition, operations and prospects; price levels of the Issuer’s securities; general market, industry and economic conditions; the relative attractiveness of alternative business and investment opportunities; and other future developments. The Reporting Persons reserve the right to change their intentions, or to formulate plans and proposals, with respect to any or all of the matters described in this paragraph, subject to applicable law and regulations.

Separately from the acquisition of the Common Stock for investment purposes, Dr. Kayyem serves as a director of the Issuer and therefore regularly engages in discussions with management of the Issuer, the board of directors of the Issuer, other shareholders of the Issuer and other relevant parties, which discussions my include matters ranging from the operations and conduct of the Issuer’s business to considering or exploring extraordinary corporate transactions including the events listed in Items 4(a) through 4(j) of Schedule 14D.

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SCHEDULE 13D

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Except as set forth in this Item 4 or Item 6 below, the Reporting Persons have no present plans or proposals that relate to, or that would result in, any of the actions specified in clauses (a) through (j) of Item 4 of Schedule 13D under the Securities Exchange Act of 1934, as amended.

Item 5.

Interest in Securities of the Issuer.

(a) (b) See the cover page.

(d) Not applicable.

(e) Not applicable.

Item 6.

Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer.

None.

Item 7.

Material to Be Filed as Exhibits.

Exhibit 99.1

Joint Filing Agreement, dated as of June 3, 2024, by and among the Reporting Persons

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SCHEDULE 13D

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SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated: June 3, 2024

	Jon F. Kayyem and Paige-Gates Kayyem Family Trust

	By:	/s/ Jon Faiz Kayyem
	Name:	Jon Faiz Kayyem
	Title:	Trustee

	Jon Faiz Kayyem

	/s/ Jon Faiz Kayyem

SEC Form SC 13D filed by Inhibrx Biosciences Inc.