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These shares were purchased in multiple transactions at prices ranging from $15.96 to $16.68 per share, 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by TAS Partners LLC (\"TAS\"). The Reporting Person is the sole managing member of TAS and, as such, has sole voting and dispositive power over the shares held by TAS. The Reporting Person disclaims beneficial ownership of the shares held by TAS except to the extent of his 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."}],"balance_after":1503358,"source":{"system":"sec-edgar","filing":"0001415889-25-010588","document":"form4-04112025_100403.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1055624/000141588925010588/form4-04112025_100403.xml","form_type":"4"}},{"id":1173545,"issuer":{"id":5328,"kind":"organization","name":"Tectonic Therapeutic, Inc.","symbol":"TECX"},"owners":[{"id":39790,"kind":"person","name":"SPRINGER TIMOTHY A","position":1,"cik":"0001055624","reported_name":"SPRINGER TIMOTHY A","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-04-11T22:12:08.000Z","date":"2025-04-10","kind":"purchase","planned":false,"acquired":true,"shares":45858,"price":16.73,"value":767204.34,"ownership":{"direct":false,"nature":"By LLC"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported price in Column 4 is a weighted average purchase price. These shares were purchased in multiple transactions at prices ranging from $16.29 to $17.00 per share, 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are held by TAS Partners LLC (\"TAS\"). The Reporting Person is the sole managing member of TAS and, as such, has sole voting and dispositive power over the shares held by TAS. 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These shares were offered and sold in reliance on the exemption afforded by Regulation D of the Securities Act of 1933, as amended."},{"field":"shares","element":"transactionShares","label":"F1","text":"These shares of common stock were purchased in a private placement transaction on February 5, 2025, which was previously announced on the Issuer's Current Report on Form 8-K, filed with the Securities and Exchange Commission on February 3, 2025. These shares were offered and sold in reliance on the exemption afforded by Regulation D of the Securities Act of 1933, as amended."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by TAS Partners LLC (\"TAS\"). The Reporting Person is the sole managing member of TAS and, as such, has sole voting and dispositive power over the shares held by TAS. 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