Tectonic Therapeutic (TECX) CBO exercises 4,500 stock options

Rhea-AI Filing Summary

Tectonic Therapeutic, Inc. reported an insider stock option exercise by Chief Business Officer Marc Schwabish. On February 10, 2026, he exercised an employee stock option for 4,500 shares of common stock at an exercise price of $2.38 per share.

Following this transaction, Schwabish directly owned 25,814 shares of common stock and held 82,014 employee stock options. The option originally vested beginning March 15, 2022, with remaining shares vesting in equal monthly installments over 36 months, subject to continued service.

Insider Trade Summary

4,500 shares exercised/converted

Mixed 2 txns

Insider Schwabish Marc

Role Chief Business Officer

Type	Security	Shares	Price	Value
Exercise	Employee Stock Option (Right to Buy)	4,500	$0.00	--
Exercise	Common Stock	4,500	$2.38	$11K

Holdings After Transaction: Employee Stock Option (Right to Buy) — 82,014 shares (Direct); Common Stock — 25,814 shares (Direct)

Footnotes (1)

1. The shares subject to the option vest as to 25% of the shares on March 15, 2022 with the remainder vesting in the following 36 equal monthly installments, subject to the Reporting Person's continued service on each such vesting date. Received in exchange for a stock option to acquire 170,679 shares of Tectonic common stock pursuant to that certain merger, as more specifically described in the Reporting Person's Form 4 filed with the Securities and Exchange Commission on June 24, 2024. https://www.sec.gov/Archives/edgar/data/1681087/000141588924017972/xslF345X05/form4-06242024_080616.xml

Form 4 Insider Transactions: What Each Field Means →

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^*

Schwabish Marc

(Last) (First) (Middle)

C/O TECTONIC THERAPEUTIC, INC.

490 ARSENAL WAY, SUITE 200

(Street)

WATERTOWN MA 02472

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Tectonic Therapeutic, Inc. [ TECX ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
02/10/2026

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	02/10/2026		M		4,500	A	$2.38	25,814	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
Employee Stock Option (Right to Buy)	$2.38	02/10/2026		M			4,500	(1)	06/27/2031	Common Stock	4,500	(2)	82,014	D

Explanation of Responses:

1. The shares subject to the option vest as to 25% of the shares on March 15, 2022 with the remainder vesting in the following 36 equal monthly installments, subject to the Reporting Person's continued service on each such vesting date.

2. Received in exchange for a stock option to acquire 170,679 shares of Tectonic common stock pursuant to that certain merger, as more specifically described in the Reporting Person's Form 4 filed with the Securities and Exchange Commission on June 24, 2024. https://www.sec.gov/Archives/edgar/data/1681087/000141588924017972/xslF345X05/form4-06242024_080616.xml

	/s/ Daniel Lochner, Attorney-in-Fact	02/12/2026
	** 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 TECX executive Marc Schwabish report?

Marc Schwabish reported exercising an employee stock option for 4,500 TECX common shares. The options had an exercise price of $2.38 per share, converting derivative securities into directly owned common stock as part of his equity compensation.

How many Tectonic Therapeutic (TECX) shares does Marc Schwabish own after this Form 4?

After the reported transaction, Marc Schwabish directly owned 25,814 TECX common shares. He also held 82,014 employee stock options, giving him additional rights to acquire common stock under previously granted equity awards.

What was the exercise price on Marc Schwabish’s TECX stock options?

The employee stock option exercised by Marc Schwabish carried an exercise price of $2.38 per share. Exercising this option converted 4,500 option rights into 4,500 shares of Tectonic Therapeutic common stock on February 10, 2026.

What type of transaction code appears on Marc Schwabish’s TECX Form 4?

The Form 4 uses transaction code M, indicating an exercise or conversion of a derivative security. In this case, an employee stock option was exercised, resulting in newly issued common shares rather than an open-market purchase or sale.

How were Marc Schwabish’s TECX stock options structured to vest over time?

The option vested 25% of the shares on March 15, 2022, with the remaining 75% vesting in 36 equal monthly installments. Continued vesting depended on Marc Schwabish’s ongoing service with Tectonic Therapeutic during each monthly vesting date.

How did Marc Schwabish originally receive the TECX stock option mentioned in this Form 4?

The employee stock option was received in exchange for a prior option to acquire 170,679 Tectonic shares. This exchange occurred in connection with a merger, as described in an earlier Form 4 filed on June 24, 2024.