Tectonic CSO exercises options and sells 43 shares

Tectonic Therapeutic, Inc. Chief Scientific Officer Peter McNamara exercised options for 43 shares of common stock at an exercise price of $14.71 per share and immediately sold 43 shares of common stock at $35.00 per share on August 12, 2026.

Rhea-AI Filing Summary

Tectonic Therapeutic, Inc. Chief Scientific Officer Peter McNamara exercised options for 43 shares of common stock at an exercise price of $14.71 per share and immediately sold 43 shares of common stock at $35.00 per share on August 12, 2026. Following the option exercise, he held 7,830 employee stock options directly. The exercise and subsequent sale were carried out under a Rule 10b5-1 trading plan adopted on November 14, 2025.

Insider Trade Summary 10b5-1

Exercise and Sale: 43 shares ($872.47 approx. pre-tax spread)

Exercise and Sale 3 txns

Insider McNamara Peter

Role Chief Scientific Officer

Sold 43 shs ($2K)

Approx. gross sale proceeds $2K

Approx. exercise cost $632.53

Approx. pre-tax spread $872.47

Type	Security	Shares	Price	Value
Exercise	Employee Stock Option (Right to Buy) F1, F2	43	$0.00	$0.00
Exercise	Common Stock F1	43	$14.71	$632.53
Sale	Common Stock F1	43	$35.00	$2K

Holdings After Transaction: Employee Stock Option (Right to Buy) — 7,830 contracts (Direct); Common Stock — 55,285 shares (Direct)

Footnotes (2)

1. F1. This exercise and subsequent sale was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 14, 2025.
2. F2. The shares subject to the option vest in 48 equal monthly installments beginning on October 25, 2025, subject to the Reporting Person's continued service to the Issuer on each such vesting date.

Key Figures

Options exercised: 43 shares Option exercise price: $14.71 per share Shares sold: 43 shares +4 more

7 metrics

Options exercised 43 shares Employee stock options exercised on August 12, 2026

Option exercise price $14.71 per share Exercise price of Employee Stock Option (Right to Buy)

Shares sold 43 shares Common stock sold on August 12, 2026

Sale price $35.00 per share Price for sale of 43 common shares

Options remaining 7,830 options Total employee stock options following the transaction

Option expiration September 24, 2035 Expiration date of the Employee Stock Option

10b5-1 plan adoption date November 14, 2025 Date Rule 10b5-1 trading plan was adopted

Key Terms

Rule 10b5-1 trading plan, Employee Stock Option (Right to Buy), derivative security, vesting, +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"This exercise and subsequent sale was made pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Employee Stock Option (Right to Buy) financial

"security_title: Employee Stock Option (Right to Buy)"

derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

vesting financial

"The shares subject to the option vest in 48 equal monthly installments"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

underlying security financial

"underlying_security_title: Common Stock as underlying security"

FAQ

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

What insider transactions did TECX Chief Scientific Officer Peter McNamara report?

Peter McNamara exercised 43 options at $14.71 per share and sold 43 common shares at $35.00 per share on August 12, 2026, in a coordinated exercise-and-sell transaction.

How many Tectonic Therapeutic (TECX) options does Peter McNamara retain after this Form 4?

After the reported transactions, Peter McNamara directly held 7,830 employee stock options. These options relate to common stock and remain outstanding following the exercise of 43 options on August 12, 2026.

At what prices did Peter McNamara exercise and sell TECX shares?

He exercised options at an exercise price of $14.71 per share and sold 43 shares of common stock at $35.00 per share, with both the exercise and sale occurring on August 12, 2026.

Was the TECX insider sale by Peter McNamara under a Rule 10b5-1 plan?

Yes. The option exercise and subsequent sale were made under a Rule 10b5-1 trading plan that Peter McNamara adopted on November 14, 2025, indicating the trades were pre-arranged.

What type of securities did Peter McNamara transact in for Tectonic Therapeutic (TECX)?

He exercised Employee Stock Options for 43 underlying common shares and then sold 43 shares of common stock. The options are a derivative security with an exercise price of $14.71 and expiry on September 24, 2035.

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

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Available on EDGAR 08/14/2026 - 07:26 PM EDT Accepted by SEC EDGAR 08/14/2026 - 07:25 PM EDT Learn about SEC filing dates

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).

X

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^*

McNamara Peter

(Last) (First) (Middle)

C/O TECTONIC THERAPEUTIC, INC.

490 ARSENAL WAY, SUITE 200

(Street)

WATERTOWN MASSACHUSETTS 02472

(City) (State) (Zip)

UNITED STATES

(Country)

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 Scientific Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/12/2026

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

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

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

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	08/12/2026		M(1)		43	A	$14.71	55,328	D
Common Stock	08/12/2026		S(1)		43	D	$35	55,285	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)	$14.71	08/12/2026		M(1)			43	(2)	09/24/2035	Common Stock	43	$0	7,830	D

Explanation of Responses:

1. This exercise and subsequent sale was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 14, 2025.

2. The shares subject to the option vest in 48 equal monthly installments beginning on October 25, 2025, subject to the Reporting Person's continued service to the Issuer on each such vesting date.

	/s/ Daniel Lochner, Attorney-in-Fact	08/14/2026
	** 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.
* Form 4: SEC 1474 (03-26)