Tectonic grants 17,750 options to CBO Schwabish

Tectonic Therapeutic granted its Chief Business Officer 17,750 stock options with time-based vesting through 2030.

Rhea-AI Filing Summary

Tectonic Therapeutic, Inc. (TECX) reported that Chief Business Officer Marc Schwabish received a grant of 17,750 employee stock options on September 3, 2026. The options have an exercise price of $29.92 per share, expire on September 2, 2036, and cover 17,750 shares of common stock.

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 October 3, 2026, subject to his continued service to the company on each vesting date. No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Grant/Award: 17,750 shares

Grant/Award 1 txn

Insider Schwabish Marc

Role Chief Business Officer

Type	Security	Shares	Price	Value
Grant/Award	Employee Stock Option (Right to Buy) F1	17,750	$0.00	$0.00

Holdings After Transaction: Employee Stock Option (Right to Buy) — 17,750 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: 17,750 options Exercise price: $29.92 per share Underlying shares: 17,750 shares of common stock +3 more

6 metrics

Options granted 17,750 options Employee stock options granted to Marc Schwabish on September 3, 2026

Exercise price $29.92 per share Exercise price of the employee stock option grant

Underlying shares 17,750 shares of common stock Shares of common stock underlying the options

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

Remaining vesting installments 42 monthly installments Vesting begins October 3, 2026, subject to continued service

Option expiration date September 2, 2036 Expiration of the employee stock option grant

Key Terms

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

4 terms

Employee Stock Option (Right to Buy) financial

"security title is listed as Employee Stock Option (Right to Buy)"

exercise price financial

"conversion or exercise price is reported as $29.92 per share"

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 September 2, 2036"

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 report for Chief Business Officer Marc Schwabish?

Tectonic Therapeutic reported that Chief Business Officer Marc Schwabish received a grant of 17,750 employee stock options on September 3, 2026. The options relate to 17,750 shares of common stock and are held directly.

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

The options granted to Marc Schwabish have an exercise price of $29.92 per share. They are structured as an employee stock option (right to buy) covering Tectonic Therapeutic’s common stock.

How do the TECX options granted to Marc Schwabish vest over time?

The grant vests over time: 1/8 of the shares vest on September 3, 2026, and the remaining shares vest in 42 equal monthly installments starting October 3, 2026, subject to his continued service to Tectonic Therapeutic on each vesting date.

When do Marc Schwabish’s TECX options expire?

The employee stock options granted to Marc Schwabish expire on September 2, 2036. After that date, any unexercised options will no longer be exercisable.

How many TECX options does Marc Schwabish hold after this grant?

Following this reported grant, Marc Schwabish holds 17,750 employee stock options directly. This reflects the full amount of the new grant as reported in the filing.

Were the TECX option grants made under a Rule 10b5-1 trading plan?

No. The filing indicates that the Rule 10b5-1 checkbox is not affirmed, meaning no Rule 10b5-1 trading plan is reported for this option grant.

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^*

Schwabish Marc

(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 Business 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		17,750		(1)	09/02/2036	Common Stock	17,750	$0	17,750	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)