Tectonic Therapeutic CEO exercises 10,000 options

Q: How many options did Tectonic Therapeutic (TECX) CEO Alise Reicin exercise?

Alise Reicin exercised options covering 10,000 Tectonic common shares on October 26, 2026, at an exercise price of $2.38 per share. She directly held 319,078 common shares after the exercise.

Q: How many TECX shares were held in the Reicin-Boiarsky Family Trust?

The Reicin-Boiarsky Family Trust held 127,030 Tectonic common shares. Reicin's spouse is a co-trustee, and Reicin may be deemed to share voting and dispositive power; she disclaims beneficial ownership except to the extent of her pecuniary interest.

The chief executive officer may be deemed to share voting and dispositive power over 127,030 shares held by the Reicin-Boiarsky Family Trust.

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Rhea-AI Filing Summary

Tectonic Therapeutic, Inc. Chief Executive Officer Alise Reicin exercised options covering 10,000 common shares on October 26, 2026, at an exercise price of $2.38 per share. Following the exercise, she directly held 319,078 common shares. A separate 127,030-share position was held by the Reicin-Boiarsky Family Trust. Reicin may be deemed to share voting and dispositive power over those trust shares, but disclaims beneficial ownership except to the extent of her pecuniary interest.

Insider Trade Summary

10,000 shares exercised/converted

Exercise 3 txns

Insider REICIN ALISE

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Exercise	Employee Stock Option (Right to Buy) ^{F3, F2}	10,000	--	--
Exercise	Common Stock	10,000	$2.38	$24K
holding	Common Stock ^F1	--	--	--

Holdings After Transaction: Employee Stock Option (Right to Buy) — 12,957 contracts (Direct); Common Stock — 319,078 shares (Direct); Common Stock — 127,030 shares (Indirect, By Trust)

Footnotes (3)

F1. These shares are held by the Reicin-Boiarsky Family Trust (the "Trust"). The Reporting Person's spouse is a co-trustee of the Trust. Accordingly, the Reporting Person may be deemed to have shared voting and dispositive power over the securities held by the Trust. The Reporting Person disclaims beneficial ownership of the shares held by the Trust except to the extent of her pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.
F2. The shares subject to the option vested as follows: (i) 4,079 shares on June 30, 2024; (ii) 4,078 shares on July 31, 2024, (iii) 4,078 shares on August 31, 2024, (iv) 4,079 shares on September 30, 2024, (v) 4,078 shares on October 31, 2024, (vi) 1,297 shares on November 30, 2024, (vii) 4,078 shares on January 31, 2025, (viii) 4,078 shares on February 28, 2025 and (iv) 4,078 shares on March 31, 2025, subject to the Reporting Person's continued service to the Issuer on each such vesting date.
F3. Received in exchange for a stock option to acquire 63,478 shares of common stock pursuant to that certain merger, as more fully described on the Reporting Person's Form 4 filed with the Securities and Exchange Commission on June 24, 2024. https://www.sec.gov/Archives/edgar/data/1681087/000141588924017952/xslF345X05/form4-06242024_080648.xml

Key Figures

Options exercised: 10,000 options Common shares acquired on exercise: 10,000 shares Exercise price: $2.38 per share +2 more

5 metrics

Options exercised 10,000 options October 26, 2026

Common shares acquired on exercise 10,000 shares October 26, 2026

Exercise price $2.38 per share Options exercised on October 26, 2026

Direct common shares after exercise 319,078 shares Reported after the October 26, 2026 exercise

Common shares held by the Reicin-Boiarsky Family Trust 127,030 shares Trust holdings reported on October 26, 2026

Key Terms

stock option, voting and dispositive power, beneficial ownership, pecuniary interest

4 terms

stock option financial

"in exchange for a stock option to acquire"

A stock option is a contract that gives you the right to buy or sell a company's stock at a specific price within a certain time frame. People use them to potentially make money if the stock's price moves favorably or to protect against losses. It's like holding a coupon that can be used to buy or sell stock at a set price later on.

voting and dispositive power regulatory

"shared voting and dispositive power over the securities"

beneficial ownership regulatory

"disclaims beneficial ownership of the shares held by the Trust"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

pecuniary interest financial

"except to the extent of her pecuniary interest therein"

FAQ

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

How many options did Tectonic Therapeutic (TECX) CEO Alise Reicin exercise?

Alise Reicin exercised options covering 10,000 Tectonic common shares on October 26, 2026, at an exercise price of $2.38 per share. She directly held 319,078 common shares after the exercise.

How many TECX shares were held in the Reicin-Boiarsky Family Trust?

The Reicin-Boiarsky Family Trust held 127,030 Tectonic common shares. Reicin's spouse is a co-trustee, and Reicin may be deemed to share voting and dispositive power; she disclaims beneficial ownership except to the extent of her pecuniary interest.

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

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Available on EDGAR 10/28/2026 - 04:30 PM EDT Accepted by SEC EDGAR 10/28/2026 - 04:30 PM EDT

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^*

REICIN ALISE

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/26/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	10/26/2026		M		10,000	A	$2.38	319,078	D
Common Stock								127,030	I	By Trust⁽¹⁾

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Employee Stock Option (Right to Buy)	$2.38	10/26/2026		M			10,000	⁽²⁾	06/27/2031	Common Stock	10,000	⁽³⁾	12,957	D

Explanation of Responses:

1. These shares are held by the Reicin-Boiarsky Family Trust (the "Trust"). The Reporting Person's spouse is a co-trustee of the Trust. Accordingly, the Reporting Person may be deemed to have shared voting and dispositive power over the securities held by the Trust. The Reporting Person disclaims beneficial ownership of the shares held by the Trust except to the extent of her pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.

2. The shares subject to the option vested as follows: (i) 4,079 shares on June 30, 2024; (ii) 4,078 shares on July 31, 2024, (iii) 4,078 shares on August 31, 2024, (iv) 4,079 shares on September 30, 2024, (v) 4,078 shares on October 31, 2024, (vi) 1,297 shares on November 30, 2024, (vii) 4,078 shares on January 31, 2025, (viii) 4,078 shares on February 28, 2025 and (iv) 4,078 shares on March 31, 2025, subject to the Reporting Person's continued service to the Issuer on each such vesting date.

3. Received in exchange for a stock option to acquire 63,478 shares of common stock pursuant to that certain merger, as more fully described on the Reporting Person's Form 4 filed with the Securities and Exchange Commission on June 24, 2024. https://www.sec.gov/Archives/edgar/data/1681087/000141588924017952/xslF345X05/form4-06242024_080648.xml

	/s/ Daniel Lochner, Attorney-in-Fact	10/28/2026
	** 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)

Source: View Original Filing on SEC EDGAR