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accrued but unpaid interest, automatically converted into shares of common stock upon the closing of the IPO at a conversion price equal to the IPO price of the common stock."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"Sanofi beneficially owns the securities reported herein through various wholly-owned subsidiaries."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Sanofi beneficially owns the securities reported herein through various wholly-owned subsidiaries."}],"balance_after":672788,"source":{"system":"sec-edgar","filing":"0001193125-26-345826","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1121404/000119312526345826/ownership.xml","form_type":"4"}},{"id":689588,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, 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The convertible note had a maturity date of June 17, 2027. The principal amount of the convertible note together with any accrued but unpaid interest automatically converted into shares of Common Stock of the Issuer upon the closing of the Issuer's initial public offering at a conversion price equal to the initial public offering price of the Issuer's common stock."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Reflects a convertible note that was convertible into shares of Common Stock of the Issuer. The convertible note had a maturity date of June 17, 2027. The principal amount of the convertible note together with any accrued but unpaid interest automatically converted into shares of Common Stock of the Issuer upon the closing of the Issuer's initial public offering at a conversion price equal to the initial public offering price of the Issuer's common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Reflects a convertible note that was convertible into shares of Common Stock of the Issuer. The convertible note had a maturity date of June 17, 2027. The principal amount of the convertible note together with any accrued but unpaid interest automatically converted into shares of Common Stock of the Issuer upon the closing of the Issuer's initial public offering at a conversion price equal to the initial public offering price of the Issuer's common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Reflects a convertible note that was convertible into shares of Common Stock of the Issuer. The convertible note had a maturity date of June 17, 2027. The principal amount of the convertible note together with any accrued but unpaid interest automatically converted into shares of Common Stock of the Issuer upon the closing of the Issuer's initial public offering at a conversion price equal to the initial public offering price of the Issuer's common stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares held directly by Westlake BioPartners Fund II, L.P. (\"Fund II\"). The general partner of Fund II is Westlake BioPartners GP II, LLC (\"GP II\"). GP II may be deemed to share voting and dispositive power with regard to the shares held directly by Fund II. Seidenberg is the sole managing director of GP II and has voting and dispositive power over the shares held by Fund II. Seidenberg disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":165519},"source":{"system":"sec-edgar","filing":"0001104659-26-093633","document":"tm2622668-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000110465926093633/tm2622668-1_4seq1.xml","form_type":"4"}},{"id":691008,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":24699,"kind":"organization","name":"Westlake BioPartners Fund I, L.P.","position":1,"cik":"0001749591","reported_name":"Westlake BioPartners Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24700,"kind":"organization","name":"Westlake BioPartners GP I, LLC","position":2,"cik":"0002007650","reported_name":"Westlake BioPartners GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24701,"kind":"organization","name":"Westlake BioPartners Fund II, L.P.","position":3,"cik":"0001811947","reported_name":"Westlake BioPartners Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24702,"kind":"organization","name":"Westlake BioPartners GP II, LLC","position":4,"cik":"0001811948","reported_name":"Westlake BioPartners GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24703,"kind":"organization","name":"Westlake BioPartners Opportunity Fund I, L.P.","position":5,"cik":"0001811946","reported_name":"Westlake BioPartners Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24704,"kind":"organization","name":"Westlake BioPartners Opportunity GP I, LLC","position":6,"cik":"0001811945","reported_name":"Westlake BioPartners Opportunity GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-2 Convertible Preferred Stock","published_at":"2026-08-11T10:00:58.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":2066857,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Shares held directly by Westlake BioPartners Opportunity Fund I, L.P. (\"Opportunity Fund\"). The general partner of Opportunity Fund is Westlake BioPartners Opportunity GP I, LLC (\"Opportunity GP\"). Opportunity GP may be deemed to share voting and dispositive power with regard to the shares held directly by Opportunity Fund. Seidenberg is the sole managing director of Opportunity GP and has voting and dispositive power over the shares held by Opportunity Fund. Seidenberg disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":2066857},"source":{"system":"sec-edgar","filing":"0001104659-26-093633","document":"tm2622668-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000110465926093633/tm2622668-1_4seq1.xml","form_type":"4"}},{"id":691007,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":24699,"kind":"organization","name":"Westlake BioPartners Fund I, L.P.","position":1,"cik":"0001749591","reported_name":"Westlake BioPartners Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24700,"kind":"organization","name":"Westlake BioPartners GP I, LLC","position":2,"cik":"0002007650","reported_name":"Westlake BioPartners GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24701,"kind":"organization","name":"Westlake BioPartners Fund II, L.P.","position":3,"cik":"0001811947","reported_name":"Westlake BioPartners Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24702,"kind":"organization","name":"Westlake BioPartners GP II, LLC","position":4,"cik":"0001811948","reported_name":"Westlake BioPartners GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24703,"kind":"organization","name":"Westlake BioPartners Opportunity Fund I, L.P.","position":5,"cik":"0001811946","reported_name":"Westlake BioPartners Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24704,"kind":"organization","name":"Westlake BioPartners Opportunity GP I, LLC","position":6,"cik":"0001811945","reported_name":"Westlake BioPartners Opportunity GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series B Convertible Preferred Stock","published_at":"2026-08-11T10:00:58.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":1484401,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares held directly by Westlake BioPartners Fund II, L.P. (\"Fund II\"). The general partner of Fund II is Westlake BioPartners GP II, LLC (\"GP II\"). GP II may be deemed to share voting and dispositive power with regard to the shares held directly by Fund II. Seidenberg is the sole managing director of GP II and has voting and dispositive power over the shares held by Fund II. Seidenberg disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":1484401},"source":{"system":"sec-edgar","filing":"0001104659-26-093633","document":"tm2622668-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000110465926093633/tm2622668-1_4seq1.xml","form_type":"4"}},{"id":691006,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":24699,"kind":"organization","name":"Westlake BioPartners Fund I, L.P.","position":1,"cik":"0001749591","reported_name":"Westlake BioPartners Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24700,"kind":"organization","name":"Westlake BioPartners GP I, LLC","position":2,"cik":"0002007650","reported_name":"Westlake BioPartners GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24701,"kind":"organization","name":"Westlake BioPartners Fund II, L.P.","position":3,"cik":"0001811947","reported_name":"Westlake BioPartners Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24702,"kind":"organization","name":"Westlake BioPartners GP II, LLC","position":4,"cik":"0001811948","reported_name":"Westlake BioPartners GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24703,"kind":"organization","name":"Westlake BioPartners Opportunity Fund I, L.P.","position":5,"cik":"0001811946","reported_name":"Westlake BioPartners Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24704,"kind":"organization","name":"Westlake BioPartners Opportunity GP I, LLC","position":6,"cik":"0001811945","reported_name":"Westlake BioPartners Opportunity GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-2 Convertible Preferred Stock","published_at":"2026-08-11T10:00:58.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":3464072,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares held directly by Westlake BioPartners Fund II, L.P. (\"Fund II\"). The general partner of Fund II is Westlake BioPartners GP II, LLC (\"GP II\"). GP II may be deemed to share voting and dispositive power with regard to the shares held directly by Fund II. Seidenberg is the sole managing director of GP II and has voting and dispositive power over the shares held by Fund II. Seidenberg disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":3464072},"source":{"system":"sec-edgar","filing":"0001104659-26-093633","document":"tm2622668-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000110465926093633/tm2622668-1_4seq1.xml","form_type":"4"}},{"id":691005,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":24699,"kind":"organization","name":"Westlake BioPartners Fund I, L.P.","position":1,"cik":"0001749591","reported_name":"Westlake BioPartners Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24700,"kind":"organization","name":"Westlake BioPartners GP I, LLC","position":2,"cik":"0002007650","reported_name":"Westlake BioPartners GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24701,"kind":"organization","name":"Westlake BioPartners Fund II, L.P.","position":3,"cik":"0001811947","reported_name":"Westlake BioPartners Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24702,"kind":"organization","name":"Westlake BioPartners GP II, LLC","position":4,"cik":"0001811948","reported_name":"Westlake BioPartners GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24703,"kind":"organization","name":"Westlake BioPartners Opportunity Fund I, L.P.","position":5,"cik":"0001811946","reported_name":"Westlake BioPartners Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24704,"kind":"organization","name":"Westlake BioPartners Opportunity GP I, LLC","position":6,"cik":"0001811945","reported_name":"Westlake BioPartners Opportunity GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-2 Convertible Preferred Stock","published_at":"2026-08-11T10:00:58.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":1027635,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares held directly by Westlake BioPartners Fund I, L.P. (\"Fund I\"). The general partner of Fund I is Westlake BioPartners GP I, LLC (\"GP I\"). GP I may be deemed to share voting and dispositive power with regard to the shares held directly by Fund I. Beth Seidenberg (\"Seidenberg\") is the sole managing director of GP I and has voting and dispositive power over the shares held by Fund I. Seidenberg disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":1027635},"source":{"system":"sec-edgar","filing":"0001104659-26-093633","document":"tm2622668-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000110465926093633/tm2622668-1_4seq1.xml","form_type":"4"}},{"id":691004,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":24699,"kind":"organization","name":"Westlake BioPartners Fund I, L.P.","position":1,"cik":"0001749591","reported_name":"Westlake BioPartners Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24700,"kind":"organization","name":"Westlake BioPartners GP I, LLC","position":2,"cik":"0002007650","reported_name":"Westlake BioPartners GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24701,"kind":"organization","name":"Westlake BioPartners Fund II, L.P.","position":3,"cik":"0001811947","reported_name":"Westlake BioPartners Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24702,"kind":"organization","name":"Westlake BioPartners GP II, LLC","position":4,"cik":"0001811948","reported_name":"Westlake BioPartners GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24703,"kind":"organization","name":"Westlake BioPartners Opportunity Fund I, L.P.","position":5,"cik":"0001811946","reported_name":"Westlake BioPartners Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24704,"kind":"organization","name":"Westlake BioPartners Opportunity GP I, LLC","position":6,"cik":"0001811945","reported_name":"Westlake BioPartners Opportunity GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A Convertible Preferred Stock","published_at":"2026-08-11T10:00:58.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":3547842,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares held directly by Westlake BioPartners Fund I, L.P. (\"Fund I\"). The general partner of Fund I is Westlake BioPartners GP I, LLC (\"GP I\"). GP I may be deemed to share voting and dispositive power with regard to the shares held directly by Fund I. Beth Seidenberg (\"Seidenberg\") is the sole managing director of GP I and has voting and dispositive power over the shares held by Fund I. Seidenberg disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":3547842},"source":{"system":"sec-edgar","filing":"0001104659-26-093633","document":"tm2622668-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000110465926093633/tm2622668-1_4seq1.xml","form_type":"4"}},{"id":691003,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":24699,"kind":"organization","name":"Westlake BioPartners Fund I, L.P.","position":1,"cik":"0001749591","reported_name":"Westlake BioPartners Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24700,"kind":"organization","name":"Westlake BioPartners GP I, LLC","position":2,"cik":"0002007650","reported_name":"Westlake BioPartners GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24701,"kind":"organization","name":"Westlake BioPartners Fund II, L.P.","position":3,"cik":"0001811947","reported_name":"Westlake BioPartners Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24702,"kind":"organization","name":"Westlake BioPartners GP II, LLC","position":4,"cik":"0001811948","reported_name":"Westlake BioPartners GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24703,"kind":"organization","name":"Westlake BioPartners Opportunity Fund I, L.P.","position":5,"cik":"0001811946","reported_name":"Westlake BioPartners Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24704,"kind":"organization","name":"Westlake BioPartners Opportunity GP I, LLC","position":6,"cik":"0001811945","reported_name":"Westlake BioPartners Opportunity GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series Seed Convertible Preferred Stock","published_at":"2026-08-11T10:00:58.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":938979,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares held directly by Westlake BioPartners Fund I, L.P. (\"Fund I\"). The general partner of Fund I is Westlake BioPartners GP I, LLC (\"GP I\"). GP I may be deemed to share voting and dispositive power with regard to the shares held directly by Fund I. Beth Seidenberg (\"Seidenberg\") is the sole managing director of GP I and has voting and dispositive power over the shares held by Fund I. Seidenberg disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":938979},"source":{"system":"sec-edgar","filing":"0001104659-26-093633","document":"tm2622668-1_4seq1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000110465926093633/tm2622668-1_4seq1.xml","form_type":"4"}},{"id":691002,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":24699,"kind":"organization","name":"Westlake BioPartners Fund I, L.P.","position":1,"cik":"0001749591","reported_name":"Westlake BioPartners Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24700,"kind":"organization","name":"Westlake BioPartners GP I, LLC","position":2,"cik":"0002007650","reported_name":"Westlake BioPartners GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24701,"kind":"organization","name":"Westlake BioPartners Fund II, L.P.","position":3,"cik":"0001811947","reported_name":"Westlake BioPartners Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24702,"kind":"organization","name":"Westlake BioPartners GP II, LLC","position":4,"cik":"0001811948","reported_name":"Westlake BioPartners GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24703,"kind":"organization","name":"Westlake BioPartners Opportunity Fund I, L.P.","position":5,"cik":"0001811946","reported_name":"Westlake BioPartners Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24704,"kind":"organization","name":"Westlake BioPartners Opportunity GP I, LLC","position":6,"cik":"0001811945","reported_name":"Westlake BioPartners Opportunity GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T10:00:58.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":2066857,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Shares held directly by Westlake BioPartners Opportunity Fund I, L.P. (\"Opportunity Fund\"). The general partner of Opportunity Fund is Westlake BioPartners Opportunity GP I, LLC (\"Opportunity GP\"). Opportunity GP may be deemed to share voting and dispositive power with regard to the shares held directly by Opportunity Fund. Seidenberg is the sole managing director of Opportunity GP and has voting and dispositive power over the shares held by Opportunity Fund. Seidenberg disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":2094813,"source":{"system":"sec-edgar","filing":"0001104659-26-093633","document":"tm2622668-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000110465926093633/tm2622668-1_4seq1.xml","form_type":"4"}},{"id":691001,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":24699,"kind":"organization","name":"Westlake BioPartners Fund I, L.P.","position":1,"cik":"0001749591","reported_name":"Westlake BioPartners Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24700,"kind":"organization","name":"Westlake BioPartners GP I, LLC","position":2,"cik":"0002007650","reported_name":"Westlake BioPartners GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24701,"kind":"organization","name":"Westlake BioPartners Fund II, L.P.","position":3,"cik":"0001811947","reported_name":"Westlake BioPartners Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24702,"kind":"organization","name":"Westlake BioPartners GP II, LLC","position":4,"cik":"0001811948","reported_name":"Westlake BioPartners GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24703,"kind":"organization","name":"Westlake BioPartners Opportunity Fund I, L.P.","position":5,"cik":"0001811946","reported_name":"Westlake BioPartners Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24704,"kind":"organization","name":"Westlake BioPartners Opportunity GP I, LLC","position":6,"cik":"0001811945","reported_name":"Westlake BioPartners Opportunity GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T10:00:58.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":165519,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Reflects a convertible note that was convertible into shares of Common Stock of the Issuer. The convertible note had a maturity date of June 17, 2027. The principal amount of the convertible note together with any accrued but unpaid interest automatically converted into shares of Common Stock of the Issuer upon the closing of the Issuer's initial public offering at a conversion price equal to the initial public offering price of the Issuer's common stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares held directly by Westlake BioPartners Fund II, L.P. (\"Fund II\"). The general partner of Fund II is Westlake BioPartners GP II, LLC (\"GP II\"). GP II may be deemed to share voting and dispositive power with regard to the shares held directly by Fund II. Seidenberg is the sole managing director of GP II and has voting and dispositive power over the shares held by Fund II. Seidenberg disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":5160847,"source":{"system":"sec-edgar","filing":"0001104659-26-093633","document":"tm2622668-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000110465926093633/tm2622668-1_4seq1.xml","form_type":"4"}},{"id":691000,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":24699,"kind":"organization","name":"Westlake BioPartners Fund I, L.P.","position":1,"cik":"0001749591","reported_name":"Westlake BioPartners Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24700,"kind":"organization","name":"Westlake BioPartners GP I, LLC","position":2,"cik":"0002007650","reported_name":"Westlake BioPartners GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24701,"kind":"organization","name":"Westlake BioPartners Fund II, L.P.","position":3,"cik":"0001811947","reported_name":"Westlake BioPartners Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24702,"kind":"organization","name":"Westlake BioPartners GP II, LLC","position":4,"cik":"0001811948","reported_name":"Westlake BioPartners GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24703,"kind":"organization","name":"Westlake BioPartners Opportunity Fund I, L.P.","position":5,"cik":"0001811946","reported_name":"Westlake BioPartners Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24704,"kind":"organization","name":"Westlake BioPartners Opportunity GP I, LLC","position":6,"cik":"0001811945","reported_name":"Westlake BioPartners Opportunity GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T10:00:58.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":1484401,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares held directly by Westlake BioPartners Fund II, L.P. (\"Fund II\"). The general partner of Fund II is Westlake BioPartners GP II, LLC (\"GP II\"). GP II may be deemed to share voting and dispositive power with regard to the shares held directly by Fund II. Seidenberg is the sole managing director of GP II and has voting and dispositive power over the shares held by Fund II. Seidenberg disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":4995328,"source":{"system":"sec-edgar","filing":"0001104659-26-093633","document":"tm2622668-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000110465926093633/tm2622668-1_4seq1.xml","form_type":"4"}},{"id":690999,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":24699,"kind":"organization","name":"Westlake BioPartners Fund I, L.P.","position":1,"cik":"0001749591","reported_name":"Westlake BioPartners Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24700,"kind":"organization","name":"Westlake BioPartners GP I, LLC","position":2,"cik":"0002007650","reported_name":"Westlake BioPartners GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24701,"kind":"organization","name":"Westlake BioPartners Fund II, L.P.","position":3,"cik":"0001811947","reported_name":"Westlake BioPartners Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24702,"kind":"organization","name":"Westlake BioPartners GP II, LLC","position":4,"cik":"0001811948","reported_name":"Westlake BioPartners GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24703,"kind":"organization","name":"Westlake BioPartners Opportunity Fund I, L.P.","position":5,"cik":"0001811946","reported_name":"Westlake BioPartners Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24704,"kind":"organization","name":"Westlake BioPartners Opportunity GP I, LLC","position":6,"cik":"0001811945","reported_name":"Westlake BioPartners Opportunity GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T10:00:58.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":3464072,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares held directly by Westlake BioPartners Fund II, L.P. (\"Fund II\"). The general partner of Fund II is Westlake BioPartners GP II, LLC (\"GP II\"). GP II may be deemed to share voting and dispositive power with regard to the shares held directly by Fund II. Seidenberg is the sole managing director of GP II and has voting and dispositive power over the shares held by Fund II. Seidenberg disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":3510927,"source":{"system":"sec-edgar","filing":"0001104659-26-093633","document":"tm2622668-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000110465926093633/tm2622668-1_4seq1.xml","form_type":"4"}},{"id":690998,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":24699,"kind":"organization","name":"Westlake BioPartners Fund I, L.P.","position":1,"cik":"0001749591","reported_name":"Westlake BioPartners Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24700,"kind":"organization","name":"Westlake BioPartners GP I, LLC","position":2,"cik":"0002007650","reported_name":"Westlake BioPartners GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24701,"kind":"organization","name":"Westlake BioPartners Fund II, L.P.","position":3,"cik":"0001811947","reported_name":"Westlake BioPartners Fund II, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24702,"kind":"organization","name":"Westlake BioPartners GP II, LLC","position":4,"cik":"0001811948","reported_name":"Westlake BioPartners GP II, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24703,"kind":"organization","name":"Westlake BioPartners Opportunity Fund I, L.P.","position":5,"cik":"0001811946","reported_name":"Westlake BioPartners Opportunity Fund I, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":24704,"kind":"organization","name":"Westlake BioPartners Opportunity GP I, LLC","position":6,"cik":"0001811945","reported_name":"Westlake BioPartners Opportunity GP I, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T10:00:58.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":1027635,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares held directly by Westlake BioPartners Fund I, L.P. (\"Fund I\"). The general partner of Fund I is Westlake BioPartners GP I, LLC (\"GP I\"). GP I may be deemed to share voting and dispositive power with regard to the shares held directly by Fund I. Beth Seidenberg (\"Seidenberg\") is the sole managing director of GP I and has voting and dispositive power over the shares held by Fund I. 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Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The securities are held of record by Foresite Capital Fund VI, LP (Fund VI). Foresite Capital Management VI, LLC (FCM VI) is the general partner of Fund VI and may be deemed to have sole voting and dispositive power over the securities held by Fund VI. The Reporting Person is the sole managing member of FCM VI and may be deemed to have sole voting and dispositive power over the securities held by Fund VI. Each of Fund VI, FCM VI and the Reporting Person disclaims the existence of a \"group\" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":1125823},"source":{"system":"sec-edgar","filing":"0001581754-26-000006","document":"form4-08102026_080804.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000158175426000006/form4-08102026_080804.xml","form_type":"4"}},{"id":692091,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":25096,"kind":"person","name":"Tananbaum James B.","position":1,"cik":"0001581754","reported_name":"Tananbaum James B.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series B Convertible Preferred Stock","published_at":"2026-08-11T00:00:09.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":445320,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The securities are held of record by Foresite Capital Fund V, L.P. (Fund V). Foresite Capital Management V, LLC (FCM V) is the general partner of Fund V and may be deemed to have sole voting and dispositive power over the securities held by Fund V. The Reporting Person is the sole managing member of FCM V and may be deemed to have sole voting and dispositive power over the securities held by Fund V. Each of Fund V, FCM V and the Reporting Person disclaims the existence of a \"group\" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":445320},"source":{"system":"sec-edgar","filing":"0001581754-26-000006","document":"form4-08102026_080804.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000158175426000006/form4-08102026_080804.xml","form_type":"4"}},{"id":692090,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":25096,"kind":"person","name":"Tananbaum James B.","position":1,"cik":"0001581754","reported_name":"Tananbaum James B.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-2 Convertible Stock","published_at":"2026-08-11T00:00:09.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":3117664,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The securities are held of record by Foresite Capital Fund V, L.P. (Fund V). Foresite Capital Management V, LLC (FCM V) is the general partner of Fund V and may be deemed to have sole voting and dispositive power over the securities held by Fund V. The Reporting Person is the sole managing member of FCM V and may be deemed to have sole voting and dispositive power over the securities held by Fund V. Each of Fund V, FCM V and the Reporting Person disclaims the existence of a \"group\" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":3117664},"source":{"system":"sec-edgar","filing":"0001581754-26-000006","document":"form4-08102026_080804.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000158175426000006/form4-08102026_080804.xml","form_type":"4"}},{"id":692089,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":25096,"kind":"person","name":"Tananbaum James B.","position":1,"cik":"0001581754","reported_name":"Tananbaum James B.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:09.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":296880,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"The securities are held of record by Foresite Capital Opportunity Fund V, L.P. (Opportunity Fund V). Foresite Capital Opportunity Management V, LLC (FCOM V) is the general partner of Opportunity Fund V and may be deemed to have sole voting and dispositive power over the shares held by Opportunity Fund V. The Reporting Person is the sole managing member of FCOM V and may be deemed to have sole voting and dispositive power over the securities held by Opportunity Fund V. Each of Opportunity Fund V, FCOM V and the Reporting Person disclaims the existence of a \"group\" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein."}],"balance_after":3414544,"source":{"system":"sec-edgar","filing":"0001581754-26-000006","document":"form4-08102026_080804.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000158175426000006/form4-08102026_080804.xml","form_type":"4"}},{"id":692088,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":25096,"kind":"person","name":"Tananbaum James B.","position":1,"cik":"0001581754","reported_name":"Tananbaum James B.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:09.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":3117664,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"The securities are held of record by Foresite Capital Opportunity Fund V, L.P. (Opportunity Fund V). Foresite Capital Opportunity Management V, LLC (FCOM V) is the general partner of Opportunity Fund V and may be deemed to have sole voting and dispositive power over the shares held by Opportunity Fund V. The Reporting Person is the sole managing member of FCOM V and may be deemed to have sole voting and dispositive power over the securities held by Opportunity Fund V. Each of Opportunity Fund V, FCOM V and the Reporting Person disclaims the existence of a \"group\" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein."}],"balance_after":3117664,"source":{"system":"sec-edgar","filing":"0001581754-26-000006","document":"form4-08102026_080804.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000158175426000006/form4-08102026_080804.xml","form_type":"4"}},{"id":692087,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":25096,"kind":"person","name":"Tananbaum James B.","position":1,"cik":"0001581754","reported_name":"Tananbaum James B.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:09.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":195776,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Reflects a convertible note that is convertible into shares of Common Stock of the Issuer. The convertible note has a maturity date of June 17, 2027. The principal amount of the convertible note together with any accrued but unpaid interest automatically converted into shares of Common Stock of the Issuer upon the closing of the Issuer's initial public offering at a conversion price equal to the initial public offering price of the Issuer's common stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The securities are held of record by Foresite Capital Fund VI, LP (Fund VI). Foresite Capital Management VI, LLC (FCM VI) is the general partner of Fund VI and may be deemed to have sole voting and dispositive power over the securities held by Fund VI. The Reporting Person is the sole managing member of FCM VI and may be deemed to have sole voting and dispositive power over the securities held by Fund VI. Each of Fund VI, FCM VI and the Reporting Person disclaims the existence of a \"group\" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein."}],"balance_after":2203800,"source":{"system":"sec-edgar","filing":"0001581754-26-000006","document":"form4-08102026_080804.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000158175426000006/form4-08102026_080804.xml","form_type":"4"}},{"id":692086,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":25096,"kind":"person","name":"Tananbaum James B.","position":1,"cik":"0001581754","reported_name":"Tananbaum James B.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:09.000Z","date":"2026-08-10","kind":"purchase","planned":false,"acquired":true,"shares":140000,"price":18,"value":2520000.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The securities are held of record by Foresite Capital Fund VI, LP (Fund VI). Foresite Capital Management VI, LLC (FCM VI) is the general partner of Fund VI and may be deemed to have sole voting and dispositive power over the securities held by Fund VI. The Reporting Person is the sole managing member of FCM VI and may be deemed to have sole voting and dispositive power over the securities held by Fund VI. Each of Fund VI, FCM VI and the Reporting Person disclaims the existence of a \"group\" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein."}],"balance_after":2008024,"source":{"system":"sec-edgar","filing":"0001581754-26-000006","document":"form4-08102026_080804.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000158175426000006/form4-08102026_080804.xml","form_type":"4"}},{"id":692085,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":25096,"kind":"person","name":"Tananbaum James B.","position":1,"cik":"0001581754","reported_name":"Tananbaum James B.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:09.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":742201,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The securities are held of record by Foresite Capital Fund VI, LP (Fund VI). Foresite Capital Management VI, LLC (FCM VI) is the general partner of Fund VI and may be deemed to have sole voting and dispositive power over the securities held by Fund VI. The Reporting Person is the sole managing member of FCM VI and may be deemed to have sole voting and dispositive power over the securities held by Fund VI. Each of Fund VI, FCM VI and the Reporting Person disclaims the existence of a \"group\" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein."}],"balance_after":1868024,"source":{"system":"sec-edgar","filing":"0001581754-26-000006","document":"form4-08102026_080804.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000158175426000006/form4-08102026_080804.xml","form_type":"4"}},{"id":692084,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":25096,"kind":"person","name":"Tananbaum James B.","position":1,"cik":"0001581754","reported_name":"Tananbaum James B.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:09.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":1125823,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The securities are held of record by Foresite Capital Fund VI, LP (Fund VI). Foresite Capital Management VI, LLC (FCM VI) is the general partner of Fund VI and may be deemed to have sole voting and dispositive power over the securities held by Fund VI. The Reporting Person is the sole managing member of FCM VI and may be deemed to have sole voting and dispositive power over the securities held by Fund VI. Each of Fund VI, FCM VI and the Reporting Person disclaims the existence of a \"group\" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein."}],"balance_after":1125823,"source":{"system":"sec-edgar","filing":"0001581754-26-000006","document":"form4-08102026_080804.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000158175426000006/form4-08102026_080804.xml","form_type":"4"}},{"id":692083,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":25096,"kind":"person","name":"Tananbaum James B.","position":1,"cik":"0001581754","reported_name":"Tananbaum James B.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:09.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":445320,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The securities are held of record by Foresite Capital Fund V, L.P. (Fund V). Foresite Capital Management V, LLC (FCM V) is the general partner of Fund V and may be deemed to have sole voting and dispositive power over the securities held by Fund V. The Reporting Person is the sole managing member of FCM V and may be deemed to have sole voting and dispositive power over the securities held by Fund V. Each of Fund V, FCM V and the Reporting Person disclaims the existence of a \"group\" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein."}],"balance_after":3562984,"source":{"system":"sec-edgar","filing":"0001581754-26-000006","document":"form4-08102026_080804.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000158175426000006/form4-08102026_080804.xml","form_type":"4"}},{"id":692082,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":25096,"kind":"person","name":"Tananbaum James B.","position":1,"cik":"0001581754","reported_name":"Tananbaum James B.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:09.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":3117664,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of preferred stock converted automatically into 1 share of common stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The preferred stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The securities are held of record by Foresite Capital Fund V, L.P. (Fund V). Foresite Capital Management V, LLC (FCM V) is the general partner of Fund V and may be deemed to have sole voting and dispositive power over the securities held by Fund V. The Reporting Person is the sole managing member of FCM V and may be deemed to have sole voting and dispositive power over the securities held by Fund V. Each of Fund V, FCM V and the Reporting Person disclaims the existence of a \"group\" and disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein."}],"balance_after":3117664,"source":{"system":"sec-edgar","filing":"0001581754-26-000006","document":"form4-08102026_080804.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000158175426000006/form4-08102026_080804.xml","form_type":"4"}},{"id":692110,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":13954,"kind":"person","name":"SEIDENBERG BETH C","position":1,"cik":"0001184592","reported_name":"SEIDENBERG BETH C","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Convertible Promissory Note","published_at":"2026-08-11T00:00:06.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":165519,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F4","text":"Reflects a convertible note that is convertible into shares of Common Stock of the Issuer. The convertible note has a maturity date of June 17, 2027. The principal amount of the convertible note together with any accrued but unpaid interest automatically converted into shares of Common Stock of the Issuer upon the closing of the Issuer's initial public offering at a conversion price equal to the initial public offering price of the Issuer's common stock."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Reflects a convertible note that is convertible into shares of Common Stock of the Issuer. The convertible note has a maturity date of June 17, 2027. The principal amount of the convertible note together with any accrued but unpaid interest automatically converted into shares of Common Stock of the Issuer upon the closing of the Issuer's initial public offering at a conversion price equal to the initial public offering price of the Issuer's common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Reflects a convertible note that is convertible into shares of Common Stock of the Issuer. The convertible note has a maturity date of June 17, 2027. The principal amount of the convertible note together with any accrued but unpaid interest automatically converted into shares of Common Stock of the Issuer upon the closing of the Issuer's initial public offering at a conversion price equal to the initial public offering price of the Issuer's common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Reflects a convertible note that is convertible into shares of Common Stock of the Issuer. The convertible note has a maturity date of June 17, 2027. The principal amount of the convertible note together with any accrued but unpaid interest automatically converted into shares of Common Stock of the Issuer upon the closing of the Issuer's initial public offering at a conversion price equal to the initial public offering price of the Issuer's common stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares held directly by Westlake BioPartners Fund II, L.P. (Fund II). The general partner of Fund II is Westlake BioPartners GP II, LLC (GP II). GP II may be deemed to share voting and dispositive power with regard to the shares held directly by Fund II. The Reporting\nPerson is the sole managing director of GP II and has voting and dispositive power over the shares held by Fund II. The Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":165519},"source":{"system":"sec-edgar","filing":"0001184592-26-000005","document":"form4-08102026_080801.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000118459226000005/form4-08102026_080801.xml","form_type":"4"}},{"id":692109,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":13954,"kind":"person","name":"SEIDENBERG BETH C","position":1,"cik":"0001184592","reported_name":"SEIDENBERG BETH C","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-2 Convertible Preferred Stock","published_at":"2026-08-11T00:00:06.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":2066857,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Shares held directly by Westlake BioPartners Opportunity Fund I, L.P. (Opportunity Fund). The general partner of Opportunity Fund is Westlake BioPartners Opportunity GP I, LLC (Opportunity GP). Opportunity GP may be deemed to share voting and dispositive power\nwith regard to the shares held directly by Opportunity Fund. The Reporting Person is the sole managing director of Opportunity GP and has voting and dispositive power over the shares held by Opportunity Fund. The Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other\npurpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":2066857},"source":{"system":"sec-edgar","filing":"0001184592-26-000005","document":"form4-08102026_080801.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000118459226000005/form4-08102026_080801.xml","form_type":"4"}},{"id":692108,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":13954,"kind":"person","name":"SEIDENBERG BETH C","position":1,"cik":"0001184592","reported_name":"SEIDENBERG BETH C","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series B Convertible Preferred Stock","published_at":"2026-08-11T00:00:06.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":1484401,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares held directly by Westlake BioPartners Fund II, L.P. (Fund II). The general partner of Fund II is Westlake BioPartners GP II, LLC (GP II). GP II may be deemed to share voting and dispositive power with regard to the shares held directly by Fund II. The Reporting\nPerson is the sole managing director of GP II and has voting and dispositive power over the shares held by Fund II. The Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":1484401},"source":{"system":"sec-edgar","filing":"0001184592-26-000005","document":"form4-08102026_080801.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000118459226000005/form4-08102026_080801.xml","form_type":"4"}},{"id":692107,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":13954,"kind":"person","name":"SEIDENBERG BETH C","position":1,"cik":"0001184592","reported_name":"SEIDENBERG BETH C","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-2 Convertible Preferred Stock","published_at":"2026-08-11T00:00:06.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":3464072,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares held directly by Westlake BioPartners Fund II, L.P. (Fund II). The general partner of Fund II is Westlake BioPartners GP II, LLC (GP II). GP II may be deemed to share voting and dispositive power with regard to the shares held directly by Fund II. The Reporting\nPerson is the sole managing director of GP II and has voting and dispositive power over the shares held by Fund II. The Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":3464072},"source":{"system":"sec-edgar","filing":"0001184592-26-000005","document":"form4-08102026_080801.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000118459226000005/form4-08102026_080801.xml","form_type":"4"}},{"id":692106,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":13954,"kind":"person","name":"SEIDENBERG BETH C","position":1,"cik":"0001184592","reported_name":"SEIDENBERG BETH C","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-2 Convertible Preferred Stock","published_at":"2026-08-11T00:00:06.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":1027635,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares held directly by Westlake BioPartners Fund I, L.P. (Fund I). The general partner of Fund I is Westlake BioPartners GP I, LLC (GP I). GP I may be deemed to share voting and dispositive power with regard to the shares held directly by Fund I. The Reporting\nPerson is the sole managing director of GP I and has voting and dispositive power over the shares held by Fund I. The Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":1027635},"source":{"system":"sec-edgar","filing":"0001184592-26-000005","document":"form4-08102026_080801.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000118459226000005/form4-08102026_080801.xml","form_type":"4"}},{"id":692105,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":13954,"kind":"person","name":"SEIDENBERG BETH C","position":1,"cik":"0001184592","reported_name":"SEIDENBERG BETH C","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A Convertible Preferred Stock","published_at":"2026-08-11T00:00:06.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":3547842,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares held directly by Westlake BioPartners Fund I, L.P. (Fund I). The general partner of Fund I is Westlake BioPartners GP I, LLC (GP I). GP I may be deemed to share voting and dispositive power with regard to the shares held directly by Fund I. The Reporting\nPerson is the sole managing director of GP I and has voting and dispositive power over the shares held by Fund I. The Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":3547842},"source":{"system":"sec-edgar","filing":"0001184592-26-000005","document":"form4-08102026_080801.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000118459226000005/form4-08102026_080801.xml","form_type":"4"}},{"id":692104,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":13954,"kind":"person","name":"SEIDENBERG BETH C","position":1,"cik":"0001184592","reported_name":"SEIDENBERG BETH C","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series Seed Convertible Stock","published_at":"2026-08-11T00:00:06.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":false,"shares":938979,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares held directly by Westlake BioPartners Fund I, L.P. (Fund I). The general partner of Fund I is Westlake BioPartners GP I, LLC (GP I). GP I may be deemed to share voting and dispositive power with regard to the shares held directly by Fund I. The Reporting\nPerson is the sole managing director of GP I and has voting and dispositive power over the shares held by Fund I. The Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":938979},"source":{"system":"sec-edgar","filing":"0001184592-26-000005","document":"form4-08102026_080801.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000118459226000005/form4-08102026_080801.xml","form_type":"4"}},{"id":692103,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":13954,"kind":"person","name":"SEIDENBERG BETH C","position":1,"cik":"0001184592","reported_name":"SEIDENBERG BETH C","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:06.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":2066857,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"Shares held directly by Westlake BioPartners Opportunity Fund I, L.P. (Opportunity Fund). The general partner of Opportunity Fund is Westlake BioPartners Opportunity GP I, LLC (Opportunity GP). Opportunity GP may be deemed to share voting and dispositive power\nwith regard to the shares held directly by Opportunity Fund. The Reporting Person is the sole managing director of Opportunity GP and has voting and dispositive power over the shares held by Opportunity Fund. The Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other\npurpose."}],"balance_after":2094813,"source":{"system":"sec-edgar","filing":"0001184592-26-000005","document":"form4-08102026_080801.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000118459226000005/form4-08102026_080801.xml","form_type":"4"}},{"id":692102,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":13954,"kind":"person","name":"SEIDENBERG BETH C","position":1,"cik":"0001184592","reported_name":"SEIDENBERG BETH C","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:06.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":165519,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Reflects a convertible note that is convertible into shares of Common Stock of the Issuer. The convertible note has a maturity date of June 17, 2027. The principal amount of the convertible note together with any accrued but unpaid interest automatically converted into shares of Common Stock of the Issuer upon the closing of the Issuer's initial public offering at a conversion price equal to the initial public offering price of the Issuer's common stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares held directly by Westlake BioPartners Fund II, L.P. (Fund II). The general partner of Fund II is Westlake BioPartners GP II, LLC (GP II). GP II may be deemed to share voting and dispositive power with regard to the shares held directly by Fund II. The Reporting\nPerson is the sole managing director of GP II and has voting and dispositive power over the shares held by Fund II. The Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":5160847,"source":{"system":"sec-edgar","filing":"0001184592-26-000005","document":"form4-08102026_080801.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000118459226000005/form4-08102026_080801.xml","form_type":"4"}},{"id":692101,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":13954,"kind":"person","name":"SEIDENBERG BETH C","position":1,"cik":"0001184592","reported_name":"SEIDENBERG BETH C","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:06.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":1484401,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares held directly by Westlake BioPartners Fund II, L.P. (Fund II). The general partner of Fund II is Westlake BioPartners GP II, LLC (GP II). GP II may be deemed to share voting and dispositive power with regard to the shares held directly by Fund II. The Reporting\nPerson is the sole managing director of GP II and has voting and dispositive power over the shares held by Fund II. The Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":4995328,"source":{"system":"sec-edgar","filing":"0001184592-26-000005","document":"form4-08102026_080801.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000118459226000005/form4-08102026_080801.xml","form_type":"4"}},{"id":692100,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":13954,"kind":"person","name":"SEIDENBERG BETH C","position":1,"cik":"0001184592","reported_name":"SEIDENBERG BETH C","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:06.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":3464072,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Shares held directly by Westlake BioPartners Fund II, L.P. (Fund II). The general partner of Fund II is Westlake BioPartners GP II, LLC (GP II). GP II may be deemed to share voting and dispositive power with regard to the shares held directly by Fund II. The Reporting\nPerson is the sole managing director of GP II and has voting and dispositive power over the shares held by Fund II. The Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":3510927,"source":{"system":"sec-edgar","filing":"0001184592-26-000005","document":"form4-08102026_080801.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000118459226000005/form4-08102026_080801.xml","form_type":"4"}},{"id":692099,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":13954,"kind":"person","name":"SEIDENBERG BETH C","position":1,"cik":"0001184592","reported_name":"SEIDENBERG BETH C","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:06.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":1027635,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares held directly by Westlake BioPartners Fund I, L.P. (Fund I). The general partner of Fund I is Westlake BioPartners GP I, LLC (GP I). GP I may be deemed to share voting and dispositive power with regard to the shares held directly by Fund I. The Reporting\nPerson is the sole managing director of GP I and has voting and dispositive power over the shares held by Fund I. The Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":5944009,"source":{"system":"sec-edgar","filing":"0001184592-26-000005","document":"form4-08102026_080801.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000118459226000005/form4-08102026_080801.xml","form_type":"4"}},{"id":692098,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":13954,"kind":"person","name":"SEIDENBERG BETH C","position":1,"cik":"0001184592","reported_name":"SEIDENBERG BETH C","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:06.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":3547842,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares held directly by Westlake BioPartners Fund I, L.P. (Fund I). The general partner of Fund I is Westlake BioPartners GP I, LLC (GP I). GP I may be deemed to share voting and dispositive power with regard to the shares held directly by Fund I. The Reporting\nPerson is the sole managing director of GP I and has voting and dispositive power over the shares held by Fund I. The Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":4916374,"source":{"system":"sec-edgar","filing":"0001184592-26-000005","document":"form4-08102026_080801.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000118459226000005/form4-08102026_080801.xml","form_type":"4"}},{"id":692097,"issuer":{"id":4709,"kind":"organization","name":"Latigo Biotherapeutics, Inc."},"owners":[{"id":13954,"kind":"person","name":"SEIDENBERG BETH C","position":1,"cik":"0001184592","reported_name":"SEIDENBERG BETH C","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2026-08-11T00:00:06.000Z","date":"2026-08-10","kind":"exercise","planned":false,"acquired":true,"shares":938979,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each share of Series Seed Convertible Preferred Stock, Series A Convertible Preferred Stock, Series A-2 Convertible Preferred Stock and Series B Convertible Preferred Stock (collectively, the \"Preferred Stock\") converted automatically into 1 share of Common Stock\nupon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Shares held directly by Westlake BioPartners Fund I, L.P. (Fund I). The general partner of Fund I is Westlake BioPartners GP I, LLC (GP I). GP I may be deemed to share voting and dispositive power with regard to the shares held directly by Fund I. The Reporting\nPerson is the sole managing director of GP I and has voting and dispositive power over the shares held by Fund I. The Reporting Person disclaims Section 16 beneficial ownership of the shares reported herein except to the extent of her pecuniary interest therein, if any, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose."}],"balance_after":1368532,"source":{"system":"sec-edgar","filing":"0001184592-26-000005","document":"form4-08102026_080801.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2056611/000118459226000005/form4-08102026_080801.xml","form_type":"4"}}]}