Tectonic Therapeutic (TECX) CFO logs tax withholding of 2,077 shares

Rhea-AI Filing Summary

Tectonic Therapeutic, Inc.'s Chief Financial Officer, Daniel Lochner, reported a routine share withholding transaction. On February 4, 2026, the issuer withheld 2,077 shares of common stock at $23.22 per share to cover the officer’s tax obligations from vesting restricted stock units granted on February 4, 2025.

After this tax-related withholding, the reporting person directly beneficially owned 26,044 shares of common stock. This reflects administrative equity compensation activity rather than an open-market purchase or sale.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Lochner Daniel

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	2,077	$23.22	$48K

Holdings After Transaction: Common Stock — 26,044 shares (Direct)

Footnotes (1)

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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^*

Lochner Daniel

(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 Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/04/2026

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	02/04/2026		F		2,077(1)	D	$23.22	26,044	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

Explanation of Responses:

1. This transaction reported represents the withholding of shares by the Issuer to satisfy the Reporting Person's tax withholding obligations in connection with the vesting and settlement of the restricted stock units granted on February 4, 2025.

	/s/ Daniel Lochner	02/10/2026
	** 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 Tectonic Therapeutic (TECX) report in this Form 4?

The filing reports a tax withholding transaction for the CFO. On February 4, 2026, 2,077 common shares were withheld by Tectonic Therapeutic at $23.22 per share to cover tax obligations from vesting restricted stock units granted in 2025.

Who is the insider in Tectonic Therapeutic (TECX)'s latest Form 4 filing?

The insider is Daniel Lochner, Chief Financial Officer of Tectonic Therapeutic. He reported a routine equity compensation-related transaction involving issuer share withholding to satisfy tax obligations tied to previously granted restricted stock units that vested on February 4, 2026.

How many Tectonic Therapeutic (TECX) shares were withheld for taxes in this transaction?

The issuer withheld 2,077 shares of Tectonic Therapeutic common stock. These shares were retained by the company at a price of $23.22 per share to satisfy the CFO’s tax withholding obligations from the vesting and settlement of earlier granted restricted stock units.

What is Daniel Lochner’s shareholding in Tectonic Therapeutic (TECX) after the reported Form 4 transaction?

Following the tax withholding transaction, Daniel Lochner directly beneficially owned 26,044 shares of Tectonic Therapeutic common stock. This figure reflects his remaining equity position after the issuer withheld 2,077 shares to cover taxes on vested restricted stock units.

Was the Tectonic Therapeutic (TECX) Form 4 a market sale by the CFO?

No, the Form 4 describes issuer share withholding, not an open-market sale. Tectonic Therapeutic retained 2,077 shares to cover the CFO’s tax obligations arising from the vesting and settlement of restricted stock units granted on February 4, 2025.

What was the price used for the Tectonic Therapeutic (TECX) tax withholding shares?

The tax withholding transaction used a price of $23.22 per share. At this price, 2,077 shares of Tectonic Therapeutic common stock were withheld by the issuer to satisfy Daniel Lochner’s tax obligations on vested restricted stock units.