Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 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 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * LEIDEN JEFFREY M 2. Issuer Name and Ticker or Trading Symbol Odyssey Therapeutics, Inc. [ODTX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O ODYSSEY THERAPEUTICS, INC., 51 SLEEPER STREET, SUITE 800 3. Date of Earliest Transaction (Month/Day/Year) 05/07/2026 (Street) BOSTON, MA 02210 4. If Amendment, Date 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 (City) (State) (Zip) 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 05/08/2026 P 5,000 A $20 270,198 D Common Stock 05/11/2026 C 28,698 A (1)(2)(3) 28,698 I See footnote(4) Common Stock 05/11/2026 M 2,963 A (5) 31,661 I See footnote(4) Common Stock 05/11/2026 F(5) 17(6) D $18 31,644 I See footnote(4)

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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 Underlying Securities (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 of Derivative Security: 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
Series B Convertible Preferred Stock	(1)	05/11/2026		C			79,166	(1)	(1)	Common Stock	8,527(7)	(1)	0	I	See footnote(4)
Series C Convertible Preferred Stock	(2)	05/11/2026		C			100,000	(2)	(2)	Common Stock	10,291(7)	(2)	0	I	See footnote(4)
Series D Convertible Preferred Stock	(3)	05/11/2026		C			96,002	(3)	(3)	Common Stock	9,880(7)	(3)	0	I	See footnote(4)
Stock Option (Right to Buy)	$18	05/07/2026		A		626,220		(8)	05/06/2036	Common Stock	626,220	$ 0	626,220	D
Series D Warrants (Right to Buy)	$0.1	05/11/2026		M			28,800	(5)	(5)	Common Stock	2,963	(5)	0	I	See footnote(4)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
LEIDEN JEFFREY M C/O ODYSSEY THERAPEUTICS, INC. 51 SLEEPER STREET, SUITE 800 BOSTON, MA 02210	X

Signatures

/s/ Jolie M. Siegel, Attorney-in-Fact		05/11/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	The Series B Preferred Stock automatically converted into Common Stock immediately prior to the closing of the Issuer's initial public offering on a 1-for-9.2837 basis for no additional consideration.
(2)	The Series C Preferred Stock automatically converted into Common Stock immediately prior to the closing of the Issuer's initial public offering on a 1-for-9.7170 basis for no additional consideration.
(3)	The Series D Preferred Stock automatically converted into Common Stock immediately prior to the closing of the Issuer's initial public offering on a 1-for-9.7170 basis for no additional consideration.
(4)	These securities are held of record by Racing Beach Ventures LLC ("Racing Beach"). The Reporting Person is a managing member of Racing Beach and may be deemed to have beneficial ownership of the securities.
(5)	The warrants to purchase shares of Common Stock were automatically exercised into shares of Common Stock by their terms immediately prior to the closing of the Issuer's initial public offering on a net exercise basis.
(6)	Pursuant to the terms of the warrants, the Issuer withheld 17 warrant shares to pay the exercise price in connection with the net exercise.
(7)	Gives effect to the 1-for-9.7170 reverse stock split effected prior to the closing of the Issuer's initial public offering.
(8)	Option will vest in full on May 7, 2027, subject to the Reporting Person's continued service on each such vesting date.

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