OS Therapies Inc (OSTX) director receives 140,000 stock options grant

Rhea-AI Filing Summary

OS Therapies Inc director Avril McKean-Dieser reported new equity awards and current holdings. As of the reported transactions, the director beneficially owns 5,000 shares of OS Therapies common stock in direct ownership. On October 21, 2025, the director was granted stock options to purchase 140,000 shares of common stock at an exercise price of $1.8 per share. These options vest in full on the one-year anniversary of the grant date, provided the director is still serving on the board at that time, and expire on October 21, 2035. The grant reflects part of the director’s equity-based compensation.

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^*

McKean-Dieser Avril Suzette

(Last) (First) (Middle)

C/O OS THERAPIES INCORPORATED

115 PULLMAN CROSSING ROAD, SUITE 103

(Street)

GRASONVILLE MD 21638

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
OS Therapies Inc [ OSTX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
10/21/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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								5,000	D

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
Stock options (right to buy)	$1.8	10/21/2025		A		140,000		(1)	10/21/2035	Common Stock	140,000	$0	140,000	D

Explanation of Responses:

1. On October 21, 2025, the reporting person was granted options to purchase 140,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as a director of the issuer on such date.

	/s/ Avril McKean-Dieser	12/19/2025
	** 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.

FAQ

What insider transaction did OS Therapies Inc (OSTX) report in this Form 4?

The filing shows that director Avril McKean-Dieser received stock options for 140,000 shares of OS Therapies Inc common stock on October 21, 2025, and reports current direct ownership of 5,000 common shares.

What are the terms of the 140,000 stock options reported by OS Therapies Inc (OSTX)?

The director received stock options (right to buy) for 140,000 shares of common stock with an exercise price of $1.8 per share. The options expire on October 21, 2035.

When do the new OS Therapies Inc (OSTX) director stock options vest?

The 140,000 stock options granted on October 21, 2025 vest in full on the one-year anniversary of the grant date, provided the reporting person is serving as a director on that date.

How many OS Therapies Inc (OSTX) shares does the director own after this filing?

Following the reported transactions, the director beneficially owns 5,000 shares of OS Therapies Inc common stock in direct ownership, in addition to the reported stock options.

Is the OS Therapies Inc (OSTX) director a 10% owner based on this Form 4?

No. The relationship section identifies the reporting person as a Director, and the 10% Owner box is not checked.

What is the exercise price and cost basis for the OS Therapies Inc (OSTX) stock options?

The stock options have a conversion or exercise price of $1.8 per share, and the price of the derivative security is reported as $0, indicating they were granted as compensation rather than purchased.