Tectonic CMO granted 24,250 stock options

Tectonic Therapeutic granted its Chief Medical Officer 24,250 stock options vesting over more than four years.

Rhea-AI Filing Summary

Tectonic Therapeutic, Inc. (TECX) reported that its Chief Medical Officer, Marcella K. Ruddy, received a grant of 24,250 Employee Stock Options on September 3, 2026, each with an exercise price of $29.92 per share and expiring on September 2, 2036.

The options cover 24,250 shares of Common Stock and are held directly. According to the vesting terms, 1/8 of the options vest on September 3, 2026, with the remaining options vesting in 42 equal monthly installments beginning on October 3, 2026, subject to Dr. Ruddy’s continued service to Tectonic Therapeutic on each vesting date.

Insider Trade Summary

Grant/Award: 24,250 shares

Grant/Award 1 txn

Insider Ruddy Marcella K.

Role Chief Medical Officer

Type	Security	Shares	Price	Value
Grant/Award	Employee Stock Option (Right to Buy) F1	24,250	$0.00	$0.00

Holdings After Transaction: Employee Stock Option (Right to Buy) — 24,250 contracts (Direct)

Footnotes (1)

1. F1. 1/8th of the shares subject to the option vest on September 3, 2026 with the remaining shares subject to the option vesting in the following 42 equal monthly installments beginning on October 3, 2026, subject to the Reporting Person's continued service to the Issuer on each such vesting date.

Key Figures

Options granted: 24,250 options Exercise price: $29.92 per share Underlying common shares: 24,250 shares +4 more

7 metrics

Options granted 24,250 options Employee Stock Option grant to Chief Medical Officer on September 3, 2026

Exercise price $29.92 per share Conversion or exercise price of Employee Stock Option

Underlying common shares 24,250 shares Common Stock underlying the Employee Stock Option grant

Post-transaction option holdings 24,250 options Total options held directly by the reporting person after the grant

Option expiration date September 2, 2036 Expiration date of the Employee Stock Option grant

Initial vesting portion 1/8 of options Vests on September 3, 2026, subject to continued service

Remaining vesting schedule 42 monthly installments Remaining options vest monthly beginning October 3, 2026

Key Terms

Employee Stock Option (Right to Buy), exercise price, vesting, expiration date

4 terms

Employee Stock Option (Right to Buy) financial

"The security is titled "Employee Stock Option (Right to Buy)""

exercise price financial

"The options have a conversion or exercise price of 29.9200"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

vesting financial

"1/8th of the shares subject to the option vest on September 3, 2026"

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.

expiration date financial

"The options carry an expiration date of 2036-09-02"

The expiration date is the deadline after which a financial contract, such as an option or a futures agreement, is no longer valid or can be exercised. It matters to investors because it determines the timeframe during which they can take action or benefit from the contract, similar to how a coupon or a food item has a limited period of usefulness. Once the expiration date passes, the contract loses its value or ability to be used.

FAQ

What insider transaction did TECX disclose for Chief Medical Officer Marcella K. Ruddy?

Tectonic Therapeutic disclosed that Chief Medical Officer Marcella K. Ruddy received a grant of 24,250 Employee Stock Options on September 3, 2026, giving her the right to buy an equal number of TECX common shares at a fixed exercise price.

What is the exercise price of the new stock options granted by TECX?

The stock options granted to the Chief Medical Officer have an exercise price of $29.92 per share, meaning each option allows the purchase of one TECX common share at $29.92 upon vesting and exercise.

How do the TECX stock options granted to the CMO vest over time?

The options vest as follows: 1/8 of the shares vest on September 3, 2026, and the remaining shares vest in 42 equal monthly installments starting October 3, 2026, conditioned on continued service on each vesting date.

When do the TECX stock options granted to the Chief Medical Officer expire?

The Employee Stock Options granted to the Chief Medical Officer expire on September 2, 2036, giving a ten-year window from the grant date during which vested options may be exercised, subject to applicable terms.

How many TECX common shares are underlying the new option grant?

The option grant covers 24,250 shares of TECX Common Stock. Each Employee Stock Option represents the right to purchase one share, so the total potential underlying common shares equal the 24,250 options granted.

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

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Available on EDGAR 09/08/2026 - 04:45 PM Accepted by SEC EDGAR 09/08/2026 - 04:45 PM 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).

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^*

Ruddy Marcella K.

(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 Medical Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/03/2026

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

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)	$29.92	09/03/2026		A		24,250		(1)	09/02/2036	Common Stock	24,250	$0	24,250	D

Explanation of Responses:

1. 1/8th of the shares subject to the option vest on September 3, 2026 with the remaining shares subject to the option vesting in the following 42 equal monthly installments beginning on October 3, 2026, subject to the Reporting Person's continued service to the Issuer on each such vesting date.

	/s/ Daniel Lochner, Attorney-in-Fact	09/08/2026
	** 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)