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Tectonic Therapeutic, Inc.

For the period ended Dec 31, 2025. Filed Feb 26, 2026.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2025 · Filed Feb 26, 2026

TECX$21.89+6.1%Stored close · as of Nov 9, 2026

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Item 9B. Other Information

During the three months ended December 31, 2025, the following directors of the Company adopted a “Rule 10b5-1 trading arrangement” as the term is defined in Item 408(a) of Regulation S-K, all of which were entered into during an open trading window in accordance with the Company’s Insider Trading Policy and all of which were intended to satisfy Rule 10b5-1(c):

On November 14, 2025, Peter McNamara, a member of our Board of Directors, adopteda Rule 10b5-1 trading plan that provides for the sale of up to 35,102 shares of common stock from the exercise of vested stock options. The plan will expire on December 14, 2026 subject to early termination for specified events set forth in the plan.

Except as set forth above, no director or officer of the Company adopted, modifiedor terminateda “Rule 10b5-1 trading arrangement” or “non-rule 10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K during the three months ended December 31, 2025.

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.