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Inhibrx grants director 10,000 options at $95.22

Amended Form 4 for INBX corrects a director’s option grant to 10,000 options at a $95.22 exercise price, vesting in 2027.

(Neutral)
(Neutral)
Form Type
4/A

Rhea-AI Filing Summary

Inhibrx Biosciences, Inc. (INBX) reports that director Douglas Forsyth received a grant of 10,000 stock options on June 3, 2026, as corrected in this amended Form 4. The options have an exercise price of $95.22 per share and cover 10,000 shares of common stock.

The options become fully exercisable on June 3, 2027, subject to Mr. Forsyth’s continued service through that date, and expire on June 3, 2036. Following this grant, Mr. Forsyth holds 10,000 options directly. No Rule 10b5-1 trading plan is reported in connection with this grant.

Positive

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Negative

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Insider FORSYTH DOUGLAS
Role Director
Type Security Shares Price Value
Grant/Award Stock Option (right to buy) F1 10,000 $0.00 $0.00
Holdings After Transaction: Stock Option (right to buy) — 10,000 contracts (Direct)
Footnotes (1)
  1. F1. This stock option will be fully exercisable on June 3, 2027, subject to the reporting person's continued service through such date.
Stock options granted 10,000 options Grant to director Douglas Forsyth on June 3, 2026
Exercise price $95.22 per share Exercise price of the 10,000 stock options granted
Underlying common shares 10,000 shares Shares of common stock underlying the granted options
Total options held after grant 10,000 options Director’s direct holdings following the reported grant
Vesting (full exercisability) date June 3, 2027 Date the options become fully exercisable, subject to continued service
Option expiration date June 3, 2036 Expiration date of the granted stock options
stock option financial
"This stock option will be fully exercisable on June 3, 2027"
A stock option is a contract that gives you the right to buy or sell a company's stock at a specific price within a certain time frame. People use them to potentially make money if the stock's price moves favorably or to protect against losses. It's like holding a coupon that can be used to buy or sell stock at a set price later on.
exercise price financial
"Stock options granted with an exercise price of $95.22 per share"
The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.
expiration date financial
"The options have an expiration date of June 3, 2036"
The expiration date is the deadline after which a financial contract, such as an option or a futures agreement, is no longer valid or can be exercised. It matters to investors because it determines the timeframe during which they can take action or benefit from the contract, similar to how a coupon or a food item has a limited period of usefulness. Once the expiration date passes, the contract loses its value or ability to be used.
Rule 10b5-1 regulatory
"No Rule 10b5-1 trading plan is reported in connection with this grant"
Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

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

What insider transaction did INBX report in this amended Form 4?

Inhibrx Biosciences reported that director Douglas Forsyth received a grant of 10,000 stock options on June 3, 2026, covering 10,000 shares of common stock at an exercise price of $95.22 per share.

Why was this Form 4/A filed for INBX?

The amended Form 4 was filed to correct the number of options granted to director Douglas Forsyth, which was misstated in the original Form 4 due to an administrative error. This amendment restates the original Form 4 in its entirety.

When do Douglas Forsyth’s INBX options vest and become exercisable?

The stock option grant to Douglas Forsyth will be fully exercisable on June 3, 2027, and this vesting is subject to his continued service with Inhibrx Biosciences through that date.

What is the exercise price and expiration date of the INBX options granted?

The 10,000 stock options granted to Douglas Forsyth have an exercise price of $95.22 per share and an expiration date of June 3, 2036, if not exercised earlier in accordance with the option terms.

How many INBX options does Douglas Forsyth hold after this grant?

Following this grant, Douglas Forsyth holds 10,000 stock options directly. These options are for 10,000 shares of Inhibrx Biosciences common stock and become fully exercisable on June 3, 2027.

Was a Rule 10b5-1 trading plan used for this INBX option grant?

No. The filing indicates that no Rule 10b5-1 trading plan applies to this transaction; it is reported simply as a grant of stock options to a director.

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

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Learn about SEC filing dates
SEC Form 4
FORM 4UNITED 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*
FORSYTH DOUGLAS

(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)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/03/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)
06/04/2026
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)
CodeVAmount(A) or (D)Price
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (right to buy)$95.2206/03/2026A10,00006/03/2027(1)06/03/2036Common Stock10,000$010,000D
Explanation of Responses:
1. This stock option will be fully exercisable on June 3, 2027, subject to the reporting person's continued service through such date.
Remarks:
This Amended Form 4 restates the original Form 4 filed on June 4, 2026 in its entirety to correct the number of options granted to the Reporting Person due to an administrative error.
/s/ Kelly D. Deck, as attorney-in-fact for Douglas G. Forsyth09/18/2026
** Signature of Reporting PersonDate
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)

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