X0508 4 2026-02-11 0001681087 Tectonic Therapeutic, Inc. TECX 0001757533 REICIN ALISE C/O TECTONIC THERAPEUTIC, INC. 490 ARSENAL WAY, SUITE 200 WATERTOWN MA 02472 true true false false Chief Executive Officer 0 Common Stock 2026-02-11 4 P 0 2500 21.10 A 237547 D Common Stock 124530 I By Trust The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $21.02 to $21.15, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote. 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 2026-02-12