Tectonic Therapeutic (TECX) Insider Filing: RSUs and Option Details for CEO

Rhea-AI Filing Summary

Tectonic Therapeutic CEO and director Reicin Alise reported multiple equity awards and holdings on Form 4. The filing shows acquisition on 09/25/2025 of 14,700 restricted stock units (RSUs) that vest in three equal annual installments on 09/25/2026, 09/25/2027 and 09/25/2028, subject to continued service. The reporting person also holds an employee stock option to buy 26,710 shares at $14.71 per share exercisable beginning 09/25/2025 with expiration 09/24/2035; the option vests monthly over 48 installments starting 10/25/2025.

The report discloses 228,185 shares beneficially owned directly after the RSU acquisition and 124,530 shares held indirectly by the Reicin-Boiarsky Family Trust, where the reporting person may share voting and dispositive power but disclaims beneficial ownership except to extent of pecuniary interest.

Positive

• Clear disclosure of equity awards: 14,700 RSUs with explicit vesting dates and a 26,710-share option at $14.71 with defined vesting schedule
• Substantial reported ownership: 228,185 shares beneficially owned following the transaction and 124,530 shares held in a family trust
• Transparent trust disclosure: Filing explains co-trustee relationship and disclaimers regarding beneficial ownership of trust-held shares

Negative

• None.

Insights

Securities/Financial Analyst

TL;DR: CEO received equity awards and holds substantial direct and indirect stock positions, consistent with standard executive compensation.

The Form 4 documents a grant of 14,700 RSUs and an outstanding option for 26,710 shares at a $14.71 exercise price, with explicit vesting schedules. The report also shows 228,185 shares directly beneficially owned after the RSU acquisition and 124,530 shares held by a family trust. These disclosures are routine for an executive and provide clear timing for when additional shares may convert into voting stock under service-based vesting conditions.

Corporate Governance Expert

TL;DR: Disclosure clarifies direct holdings, option economics, vesting timelines and indirect ownership via family trust.

The filing precisely states the nature of indirect ownership through the Reicin-Boiarsky Family Trust and includes a disclaimer regarding beneficial ownership limited to pecuniary interest. Vesting terms for both RSUs and the option are specified, which aids transparency about future dilution timing and executive retention mechanics. No amendments or corrective statements are indicated.

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

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

REICIN ALISE

(Last) (First) (Middle)

C/O TECTONIC THERAPEUTIC, INC.

490 ARSENAL WAY, SUITE 210

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
09/25/2025

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	09/25/2025		A		14,700(1)	A	$0	228,185	D
Common Stock								124,530	I	By Trust(2)

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	09/25/2025		A		26,710		(3)	09/24/2035	Common Stock	26,710	$0	26,710	D

Explanation of Responses:

1. These shares are represented by restricted stock units. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer. The shares shall vest in 3 equal annual installments on each of September 25, 2026, September 25, 2027 and September 25, 2028, subject to the Reporting Person's continued service to the Issuer on each such vesting date.

2. 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.

3. 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	09/29/2025
	** 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.
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FAQ

What insider activity did Reicin Alise report on Form 4 for TECX?

The filing reports acquisition of 14,700 RSUs on 09/25/2025 and an existing employee stock option for 26,710 shares exercisable beginning 09/25/2025 at $14.71.

How many shares does the filing show Reicin Alise beneficially owning after the transaction?

The report shows 228,185 shares beneficially owned following the reported transaction(s).

What are the vesting terms for the RSUs reported on TECX Form 4?

The 14,700 RSUs vest in three equal annual installments on 09/25/2026, 09/25/2027, and 09/25/2028, subject to continued service.

What is the nature of the indirect ownership disclosed in the filing?

The filing discloses 124,530 shares held by the Reicin-Boiarsky Family Trust and states the reporting person may share voting and dispositive power but disclaims beneficial ownership except to the extent of pecuniary interest.

When do the option shares vest and when do they expire?

The option for 26,710 shares vests in 48 equal monthly installments beginning 10/25/2025 and the option expires on 09/24/2035.