TECX insider files Form 144 to sell 129 shares

TECX filed a Form 144 notice for a planned sale of common stock.

Rhea-AI Filing Summary

TECX filed a Form 144 notice for a planned sale of common stock. The filing lists 129 shares of common stock to be sold through Morgan Stanley Smith Barney LLC Executive Financial Services on August 12, 2026, with an indicated market value of $4,111.23 and listing on NASDAQ. The shares are to be sold after acquisition via an exercise of stock options for cash. The filing also notes a prior 10b5-1 sale by Peter McNamara of 172 shares of common stock on June 30, 2026 for $6,020.00.

Key Figures

Shares to be sold: 129 shares Market value of planned sale: $4,111.23 Prior 10b5-1 shares sold: 172 shares +1 more

4 metrics

Shares to be sold 129 shares Common stock planned for sale on August 12, 2026

Market value of planned sale $4,111.23 Value associated with 129 common shares to be sold

Prior 10b5-1 shares sold 172 shares Common stock sold on June 30, 2026 under 10b5-1

Proceeds from prior 10b5-1 sale $6,020.00 Value for 172 common shares sold on June 30, 2026

Key Terms

Form 144, 10b5-1, Exercise of Stock Options, Executive Financial Services

4 terms

Form 144 regulatory

"TECX filed a Form 144 notice for a planned sale of common stock."

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

10b5-1 regulatory

"The filing also notes a prior 10b5-1 sale by Peter McNamara."

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Exercise of Stock Options financial

"The shares are to be sold after acquisition via an exercise of stock options for cash."

Executive Financial Services financial

"through Morgan Stanley Smith Barney LLC Executive Financial Services on August 12, 2026"

FAQ

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

What stock sale is disclosed for TECX in this Form 144 filing?

The Form 144 discloses a planned sale of 129 shares of TECX common stock on August 12, 2026 through Morgan Stanley Smith Barney LLC Executive Financial Services, following acquisition via an exercise of stock options for cash.

What is the reported market value of the TECX shares to be sold?

The filing reports a market value of $4,111.23 for the 129 TECX common shares planned for sale. The shares are listed on NASDAQ, and the transaction is connected to an exercise of stock options for cash.

How were the TECX shares in the Form 144 acquired before sale?

The 129 TECX common shares covered by the Form 144 are to be sold after acquisition on August 12, 2026 via an exercise of stock options from the issuer, with consideration described as cash.

Which broker is handling the TECX Form 144 stock sale?

The filing lists Morgan Stanley Smith Barney LLC Executive Financial Services, at 1 New York Plaza, 8th Floor, New York, NY 10004, as the broker handling the planned sale of 129 TECX common shares on NASDAQ.

What prior 10b5-1 sale related to TECX is mentioned in the Form 144?

The Form 144 notes a prior 10b5-1 sale for Peter McNamara of 172 TECX common shares on June 30, 2026 for $6,020.00, in the section covering securities sold during the past three months.

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

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Accepted by SEC EDGAR 08/12/2026 - 04:37 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002023255
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	TECTONIC THERAPEUTIC INC
SEC File Number	001-38537
Address of Issuer	490 Arsenal Way Suite 200 Watertown MASSACHUSETTS 02472
Phone	3396663320
Name of Person for Whose Account the Securities are To Be Sold	PETER MCNAMARA
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	129	4111.23	19549366	08/12/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	08/12/2026	Exercise of Stock Options	Issuer			129	08/12/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for PETER MCNAMARA 490 Arsenal Way Suite 200 Watertown MA 02472	Common	06/30/2026	172	6020.00

144: Remarks and Signature

Remarks	The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale.
Date of Notice	08/12/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/14/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Peter McNamara
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)