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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 sold at each separate price within the ranges set forth in this footnote."}],"balance_after":346523,"source":{"system":"sec-edgar","filing":"0000899243-20-004179","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1681087/000089924320004179/doc4.xml","form_type":"4"}},{"id":3279219,"issuer":{"id":5328,"kind":"organization","name":"Tectonic Therapeutic, Inc.","symbol":"TECX"},"owners":[{"id":112310,"kind":"person","name":"MACKAY GEOFFREY","position":1,"cik":"0001741849","reported_name":"MACKAY GEOFFREY","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2020-02-12T02:23:30.000Z","date":"2020-02-11","kind":"sale","acquired":false,"shares":44596,"price":27.3563,"value":1219981.5548,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $27.00 to $27.995, 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 sold at each separate price within the ranges set forth in this footnote."}],"balance_after":364927,"source":{"system":"sec-edgar","filing":"0000899243-20-004179","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1681087/000089924320004179/doc4.xml","form_type":"4"}},{"id":3559053,"issuer":{"id":5328,"kind":"organization","name":"Tectonic Therapeutic, Inc.","symbol":"TECX"},"owners":[{"id":112310,"kind":"person","name":"MACKAY GEOFFREY","position":1,"cik":"0001741849","reported_name":"MACKAY GEOFFREY","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2019-04-09T20:27:36.000Z","date":"2019-04-08","kind":"sale","acquired":false,"shares":698,"price":27.0677,"value":18893.2546,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $27.00 to $27.145, 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 sold at each separate price within the ranges set forth in this footnote."}],"balance_after":409523,"source":{"system":"sec-edgar","filing":"0000899243-19-010373","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1681087/000089924319010373/doc4.xml","form_type":"4"}},{"id":3559052,"issuer":{"id":5328,"kind":"organization","name":"Tectonic Therapeutic, Inc.","symbol":"TECX"},"owners":[{"id":112310,"kind":"person","name":"MACKAY GEOFFREY","position":1,"cik":"0001741849","reported_name":"MACKAY GEOFFREY","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2019-04-09T20:27:36.000Z","date":"2019-04-05","kind":"sale","acquired":false,"shares":13302,"price":27.2604,"value":362617.8408,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $27.00 to $27.75, 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 sold at each separate price within the ranges set forth in this footnote."}],"balance_after":410221,"source":{"system":"sec-edgar","filing":"0000899243-19-010373","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1681087/000089924319010373/doc4.xml","form_type":"4"}},{"id":3605708,"issuer":{"id":5328,"kind":"organization","name":"Tectonic Therapeutic, Inc.","symbol":"TECX"},"owners":[{"id":112310,"kind":"person","name":"MACKAY GEOFFREY","position":1,"cik":"0001741849","reported_name":"MACKAY GEOFFREY","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Stock Option (Right to Buy)","published_at":"2019-03-07T21:30:52.000Z","date":"2019-03-05","kind":"grant","acquired":true,"shares":100000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"25% of the shares vest on March 5, 2020, and the remaining 75% shall vest in equal monthly installments thereafter over a three-year period."}],"balance_after":100000,"derivative":{"exercise_price":15,"expiration_date":"2029-03-04","underlying":"Common Stock","underlying_shares":100000},"source":{"system":"sec-edgar","filing":"0000899243-19-006669","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1681087/000089924319006669/doc4.xml","form_type":"4"}}]}