Tectonic Therapeutic (TECX) CEO logs routine tax withholding on vested RSUs

Rhea-AI Filing Summary

Tectonic Therapeutic, Inc. Chief Executive Officer Alise Reicin reported routine share movements related to equity compensation. The company withheld 924 shares of Common Stock at $30.34 per share to cover her tax obligations when restricted stock units granted on December 4, 2024 vested and settled. After this tax-withholding disposition, she directly holds 310,623 shares of Common Stock. A separate entry shows 127,030 shares held indirectly through the Reicin-Boiarsky Family Trust, where she may share voting and dispositive power but disclaims beneficial ownership beyond her pecuniary interest. These events reflect compensation mechanics rather than open-market buying or selling.

Insights

Equity compensation analyst

Filing shows routine tax withholding on vested stock units, not an open-market sale.

The CEO of Tectonic Therapeutic, Alise Reicin, had 924 shares withheld at $30.34 per share to pay taxes on vested restricted stock units granted on December 4, 2024. This is a standard equity-compensation mechanism.

Following the disposition, she holds 310,623 shares directly and 127,030 shares are reported as held by the Reicin-Boiarsky Family Trust. She may share voting and dispositive power for the trust position but disclaims beneficial ownership beyond her pecuniary interest.

The tax-withholding amount is small relative to her total reported holdings, and there are no derivative exercises or open-market trades in this filing. Overall, the information appears administratively routine and does not materially alter the company’s insider ownership picture.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider REICIN ALISE

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	924	$30.34	$28K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 310,623 shares (Direct, null); Common Stock — 127,030 shares (Indirect, By Trust)

Footnotes (1)

1. This transaction reported represents the withholding of shares by the Issuer to satisfy the Reporting Person's tax withholding obligations in connection with the vesting and settlement of the restricted stock units granted on December 4, 2024. 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.

Key Figures

Tax-withheld shares: 924 shares Withholding price: $30.34 per share Direct holdings after transaction: 310,623 shares +2 more

5 metrics

Tax-withheld shares 924 shares Shares withheld to satisfy tax obligations on RSU vesting

Withholding price $30.34 per share Value applied to 924 withheld shares

Direct holdings after transaction 310,623 shares CEO Common Stock directly owned after tax-withholding disposition

Trust-held shares 127,030 shares Common Stock reported as held by Reicin-Boiarsky Family Trust

Tax-withholding transactions 1 transaction, 924 shares Summary of F-code tax-withholding disposition events

Key Terms

restricted stock units, tax withholding obligations, pecuniary interest, beneficial ownership, +1 more

5 terms

restricted stock units financial

"in connection with the vesting and settlement of the restricted stock units granted on December 4, 2024"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"withholding of shares by the Issuer to satisfy the Reporting Person's tax withholding obligations in connection with the vesting"

pecuniary interest financial

"disclaims beneficial ownership of the shares held by the Trust except to the extent of her pecuniary interest therein"

beneficial ownership financial

"disclaims beneficial ownership of the shares held by the Trust except to the extent of her pecuniary interest therein"

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.

Section 16 regulatory

"this report shall not be deemed an admission that the Reporting Person is the beneficial owner of these securities for purposes of Section 16"

Section 16 is a U.S. securities law rule that governs the trading and disclosure obligations of company insiders — typically officers, directors and large shareholders — to promote transparency and deter unfair profit-taking. It requires insiders to publicly report their stock trades and allows companies or the issuer to reclaim quick, short-term profits from certain insider trades, like a scoreboard and a refund policy that help investors see and limit possible insider advantage.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/23/2026 - 05:52 PM Accepted by SEC EDGAR 06/23/2026 - 05:52 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^*

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)
06/20/2026

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	06/20/2026		F		924(1)	D	$30.34	310,623	D
Common Stock								127,030	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

Explanation of Responses:

1. This transaction reported represents the withholding of shares by the Issuer to satisfy the Reporting Person's tax withholding obligations in connection with the vesting and settlement of the restricted stock units granted on December 4, 2024.

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.

	/s/ Daniel Lochner, Attorney-in-Fact	06/23/2026
	** 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)

FAQ

What insider transaction did Tectonic Therapeutic (TECX) report for its CEO?

Tectonic Therapeutic reported that CEO Alise Reicin had 924 shares of Common Stock withheld to satisfy tax obligations tied to vested restricted stock units, rather than executing an open-market trade. This is a standard equity compensation-related transaction, not a discretionary purchase or sale.

How many Tectonic Therapeutic (TECX) shares does the CEO hold after this Form 4?

After the reported tax-withholding disposition, CEO Alise Reicin directly holds 310,623 shares of Tectonic Therapeutic Common Stock. In addition, 127,030 shares are reported as held indirectly through the Reicin-Boiarsky Family Trust, reflecting a separate block of insider-associated ownership.

Was the Tectonic Therapeutic (TECX) CEO Form 4 an open-market sale?

No, the Form 4 does not show an open-market sale. It reports 924 shares withheld by the issuer to cover tax obligations upon vesting of restricted stock units, coded as an F transaction, which is a tax-withholding disposition rather than a discretionary market trade.

What price was used for the TECX CEO tax-withholding shares?

The 924 Tectonic Therapeutic shares withheld for CEO Alise Reicin’s tax obligations were valued at $30.34 per share. This price applies to the compensation-related withholding transaction connected to the vesting and settlement of restricted stock units granted on December 4, 2024.

How are Tectonic Therapeutic (TECX) shares held by the Reicin-Boiarsky Family Trust treated?

127,030 Tectonic Therapeutic shares are held by the Reicin-Boiarsky Family Trust, where the CEO’s spouse is a co-trustee. Alise Reicin may share voting and dispositive power but disclaims beneficial ownership beyond her pecuniary interest in those trust-held securities.

Does this TECX Form 4 indicate any change in derivative positions?

The Form 4 data provided shows no derivative transactions, such as option exercises or conversions. The filing reflects one tax-withholding disposition of 924 Common Stock shares and one holding entry for trust-owned shares, with no remaining derivative positions listed in the derivative summary.