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The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares purchased at each respective price within the range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 4,579 shares acquired on May 15, 2025 and 8,278 shares acquired on May 15, 2026, pursuant to the Issuer's Employee Stock Purchase Plan."}],"balance_after":390476,"source":{"system":"sec-edgar","filing":"0001818520-26-000003","document":"form4-09252026_040908.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000181852026000003/form4-09252026_040908.xml","form_type":"4"}},{"id":888218,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PRESIDENT AND CEO"}}],"security":"Stock Option (Right to Buy)","published_at":"2026-02-23T19:11:22.000Z","date":"2026-02-19","kind":"grant","planned":false,"acquired":true,"shares":1250000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"1/48th of the shares subject to the option vest on each monthly anniversary measured from February 19, 2026 (the \"Vesting Commencement Date\"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date, subject to Reporting Person's continuous service with the Issuer as of each such vesting date."}],"balance_after":1250000,"derivative":{"exercise_price":5.1,"expiration_date":"2036-02-19","underlying":"Common Stock","underlying_shares":1250000},"source":{"system":"sec-edgar","filing":"0001818520-26-000001","document":"form4-02242026_120218.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000181852026000001/form4-02242026_120218.xml","form_type":"4"}},{"id":1236061,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PRESIDENT AND CEO"}}],"security":"Stock Option (Right to Buy)","published_at":"2025-03-03T16:50:19.000Z","date":"2025-02-27","kind":"grant","planned":false,"acquired":true,"shares":1300000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"1/48th of the shares subject to the option vest on each monthly anniversary measured from February 27, 2025 (the \"Vesting Commencement Date\"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date."}],"balance_after":1300000,"derivative":{"exercise_price":2.5,"expiration_date":"2034-02-27","underlying":"Common Stock","underlying_shares":1300000},"source":{"system":"sec-edgar","filing":"0001415889-25-006192","document":"form4-03032025_090314.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000141588925006192/form4-03032025_090314.xml","form_type":"4"}},{"id":1263956,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PRESIDENT AND CEO"}}],"security":"Common Stock","published_at":"2025-02-18T16:30:13.000Z","date":"2025-02-13","kind":"sale","planned":false,"acquired":false,"shares":5021,"price":2.95,"value":14811.95,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The shares were sold to cover tax withholding obligations in connection with the vesting of restricted stock units (\"RSUs\")."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $2.87 to $3.0297, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."}],"balance_after":351554,"source":{"system":"sec-edgar","filing":"0001415889-25-004434","document":"form4-02182025_040207.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000141588925004434/form4-02182025_040207.xml","form_type":"4"}},{"id":1306759,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PRESIDENT AND CEO"}}],"security":"Stock Option (Right to 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The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 13,334 RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes 2,650 shares acquired on May 15, 2023 and 1,607 shares acquired on November 15, 2023, pursuant to the Issuer's Employee Stock Purchase Plan."}],"balance_after":196121,"source":{"system":"sec-edgar","filing":"0001415889-24-003856","document":"form4-02152024_120225.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000141588924003856/form4-02152024_120225.xml","form_type":"4"}},{"id":2003793,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Stock Option (Right to Buy)","published_at":"2023-02-21T17:28:32.000Z","date":"2023-02-16","kind":"grant","acquired":true,"shares":345000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"1/48th of the shares subject to the option vest on each monthly anniversary measured from February 16, 2023 (the \"Vesting Commencement Date\"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date."}],"balance_after":345000,"derivative":{"exercise_price":5.94,"expiration_date":"2033-02-16","underlying":"Common Stock","underlying_shares":345000},"source":{"system":"sec-edgar","filing":"0001567619-23-003427","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000156761923003427/doc1.xml","form_type":"4"}},{"id":2007934,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2023-02-17T17:12:31.000Z","date":"2023-02-15","kind":"sale","acquired":false,"shares":6571,"price":5.8688,"value":38563.8848,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The shares were sold to cover tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $5.80 to $5.95, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 3,274 shares acquired on May 15, 2022 and 1 share acquired on November 15, 2022, pursuant to the Issuer's Employee Stock Purchase Plan."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes 26,667 restricted stock 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The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001567619-21-007429","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000156761921007429/doc1.xml","form_type":"4"}},{"id":2761711,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2021-04-02T12:31:03.000Z","date":"2021-03-31","kind":"exercise","acquired":true,"shares":7102,"price":1.4096,"value":10010.9792,"ownership":{"direct":true},"balance_after":7102,"source":{"system":"sec-edgar","filing":"0001567619-21-007429","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000156761921007429/doc1.xml","form_type":"4"}},{"id":2766624,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Stock Option (Right to Buy)","published_at":"2021-03-31T16:04:28.000Z","date":"2021-03-30","kind":"exercise","acquired":false,"shares":3750,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The shares subject to the option vest are fully vested and exercisable."}],"balance_after":60596,"derivative":{"exercise_price":1.4096,"expiration_date":"2025-01-22","underlying":"Common Stock","underlying_shares":3750},"source":{"system":"sec-edgar","filing":"0001567619-21-007290","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000156761921007290/doc1.xml","form_type":"4"}},{"id":2766623,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Stock Option (Right to Buy)","published_at":"2021-03-31T16:04:28.000Z","date":"2021-03-29","kind":"exercise","acquired":false,"shares":3750,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The shares subject to the option vest are fully vested and exercisable."}],"balance_after":64346,"derivative":{"exercise_price":1.4096,"expiration_date":"2025-01-22","underlying":"Common Stock","underlying_shares":3750},"source":{"system":"sec-edgar","filing":"0001567619-21-007290","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000156761921007290/doc1.xml","form_type":"4"}},{"id":2766622,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2021-03-31T16:04:28.000Z","date":"2021-03-30","kind":"sale","acquired":false,"shares":1850,"price":24.7843,"value":45850.955,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"This transaction was executed in multiple trades in prices ranging from $24.63 to $25.00, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001567619-21-007290","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000156761921007290/doc1.xml","form_type":"4"}},{"id":2766621,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2021-03-31T16:04:28.000Z","date":"2021-03-30","kind":"sale","acquired":false,"shares":1900,"price":24.2711,"value":46115.09,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"This transaction was executed in multiple trades in prices ranging from $23.63 to $24.56, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."}],"balance_after":1850,"source":{"system":"sec-edgar","filing":"0001567619-21-007290","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000156761921007290/doc1.xml","form_type":"4"}},{"id":2766620,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2021-03-31T16:04:28.000Z","date":"2021-03-30","kind":"exercise","acquired":true,"shares":3750,"price":1.4096,"value":5286.0,"ownership":{"direct":true},"balance_after":3750,"source":{"system":"sec-edgar","filing":"0001567619-21-007290","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000156761921007290/doc1.xml","form_type":"4"}},{"id":2766619,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2021-03-31T16:04:28.000Z","date":"2021-03-29","kind":"sale","acquired":false,"shares":300,"price":27.2383,"value":8171.49,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades in prices ranging from $27.03 to $27.515, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001567619-21-007290","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000156761921007290/doc1.xml","form_type":"4"}},{"id":2766618,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2021-03-31T16:04:28.000Z","date":"2021-03-29","kind":"sale","acquired":false,"shares":600,"price":26.4184,"value":15851.04,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades in prices ranging from $26.02 to $27.00, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."}],"balance_after":300,"source":{"system":"sec-edgar","filing":"0001567619-21-007290","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000156761921007290/doc1.xml","form_type":"4"}},{"id":2766617,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2021-03-31T16:04:28.000Z","date":"2021-03-29","kind":"sale","acquired":false,"shares":2850,"price":25.0216,"value":71311.56,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $24.74 to $25.63, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."}],"balance_after":900,"source":{"system":"sec-edgar","filing":"0001567619-21-007290","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000156761921007290/doc1.xml","form_type":"4"}},{"id":2766616,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2021-03-31T16:04:28.000Z","date":"2021-03-29","kind":"exercise","acquired":true,"shares":3750,"price":1.4096,"value":5286.0,"ownership":{"direct":true},"balance_after":3750,"source":{"system":"sec-edgar","filing":"0001567619-21-007290","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000156761921007290/doc1.xml","form_type":"4"}},{"id":2826913,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":65192,"kind":"person","name":"Love Douglas","position":1,"cik":"0001818520","reported_name":"Love Douglas","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Stock Option (Right to Buy)","published_at":"2021-03-01T20:04:39.000Z","date":"2021-02-25","kind":"grant","acquired":true,"shares":325000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"1/48th of the shares subject to the option vest on each monthly anniversary measured from February 25, 2021 (the \"Vesting Commencement Date\"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date."}],"balance_after":325000,"derivative":{"exercise_price":30.07,"expiration_date":"2031-02-25","underlying":"Common Stock","underlying_shares":325000},"source":{"system":"sec-edgar","filing":"0001567619-21-005219","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818520/000156761921005219/doc1.xml","form_type":"4"}}]}