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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":182625,"source":{"system":"sec-edgar","filing":"0001818522-26-000003","document":"form4-03042026_040340.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000181852226000003/form4-03042026_040340.xml","form_type":"4"}},{"id":888220,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF BUSINESS OFFICER"}}],"security":"Stock Option (Right to Buy)","published_at":"2026-02-23T19:08:42.000Z","date":"2026-02-19","kind":"grant","planned":false,"acquired":true,"shares":250000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","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":250000,"derivative":{"exercise_price":5.1,"expiration_date":"2036-02-19","underlying":"Common Stock","underlying_shares":250000},"source":{"system":"sec-edgar","filing":"0001818522-26-000002","document":"form4-02242026_120238.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000181852226000002/form4-02242026_120238.xml","form_type":"4"}},{"id":888219,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF BUSINESS OFFICER"}}],"security":"Common Stock","published_at":"2026-02-23T19:08:42.000Z","date":"2026-02-19","kind":"grant","planned":false,"acquired":true,"shares":62500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Constitute restricted stock units (\"RSUs\") for which the Reporting Person is entitled to receive one (1) share of Common Stock for each RSU upon vesting. 1/3rd of the RSUs vest annually on February 19 of each year, with the first 1/3rd vesting on February 19, 2027, subject to Reporting Person's continuous service with the Issuer as of each such vesting date."}],"balance_after":186964,"source":{"system":"sec-edgar","filing":"0001818522-26-000002","document":"form4-02242026_120238.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000181852226000002/form4-02242026_120238.xml","form_type":"4"}},{"id":890823,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF BUSINESS OFFICER"}}],"security":"Common Stock","published_at":"2026-02-20T16:30:09.000Z","date":"2026-02-18","kind":"sale","planned":false,"acquired":false,"shares":6225,"price":5.1,"value":31747.5,"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 $4.93 to $5.16, 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":124464,"source":{"system":"sec-edgar","filing":"0001818522-26-000001","document":"form4-02202026_040205.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000181852226000001/form4-02202026_040205.xml","form_type":"4"}},{"id":1086625,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF BUSINESS OFFICER"}}],"security":"Common Stock","published_at":"2025-07-16T16:20:06.000Z","date":"2025-07-14","kind":"sale","planned":false,"acquired":false,"shares":853,"price":2.61,"value":2226.33,"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 $2.57 to $2.64, 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":130689,"source":{"system":"sec-edgar","filing":"0001415889-25-019836","document":"form4-07162025_040701.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000141588925019836/form4-07162025_040701.xml","form_type":"4"}},{"id":1236063,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF BUSINESS OFFICER"}}],"security":"Stock Option (Right to Buy)","published_at":"2025-03-03T16:45:44.000Z","date":"2025-02-27","kind":"grant","planned":false,"acquired":true,"shares":272575,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","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":272575,"derivative":{"exercise_price":2.5,"expiration_date":"2034-02-27","underlying":"Common Stock","underlying_shares":272575},"source":{"system":"sec-edgar","filing":"0001415889-25-006190","document":"form4-03032025_090336.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000141588925006190/form4-03032025_090336.xml","form_type":"4"}},{"id":1236062,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF BUSINESS OFFICER"}}],"security":"Common Stock","published_at":"2025-03-03T16:45:44.000Z","date":"2024-02-27","kind":"grant","planned":false,"acquired":true,"shares":44963,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Constitute restricted stock units (\"RSUs\") for which the Reporting Person is entitled to receive one (1) share of Common Stock for each RSU upon vesting. 1/3rd of the RSUs vest annually on February 27 of each year, with the first 1/3rd vesting on February 27, 2026."}],"balance_after":131542,"source":{"system":"sec-edgar","filing":"0001415889-25-006190","document":"form4-03032025_090336.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000141588925006190/form4-03032025_090336.xml","form_type":"4"}},{"id":1255989,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF BUSINESS OFFICER"}}],"security":"Common Stock","published_at":"2025-02-20T16:49:49.000Z","date":"2025-02-18","kind":"sale","planned":false,"acquired":false,"shares":6618,"price":2.95,"value":19523.1,"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 $2.85 to $3.12, 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":86579,"source":{"system":"sec-edgar","filing":"0001415889-25-004887","document":"form4-02202025_090246.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000141588925004887/form4-02202025_090246.xml","form_type":"4"}},{"id":1263957,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF BUSINESS OFFICER"}}],"security":"Common Stock","published_at":"2025-02-18T16:30:11.000Z","date":"2025-02-13","kind":"sale","planned":false,"acquired":false,"shares":1425,"price":2.99,"value":4260.75,"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 $2.90 to $3.02, 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":93197,"source":{"system":"sec-edgar","filing":"0001415889-25-004431","document":"form4-02182025_040201.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000141588925004431/form4-02182025_040201.xml","form_type":"4"}},{"id":1452700,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF BUSINESS OFFICER"}}],"security":"Common Stock","published_at":"2024-07-17T16:49:54.000Z","date":"2024-07-15","kind":"sale","planned":false,"acquired":false,"shares":784,"price":6.02,"value":4719.68,"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 $5.99 to $6.05, 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 9,765 shares acquired on May 15, 2024, pursuant to the Issuer's Employee Stock Purchase Plan."}],"balance_after":94622,"source":{"system":"sec-edgar","filing":"0001415889-24-019679","document":"form4-07172024_080750.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000141588924019679/form4-07172024_080750.xml","form_type":"4"}},{"id":1629607,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF BUSINESS OFFICER"}}],"security":"Stock Option (Right to Buy)","published_at":"2024-02-21T16:31:41.000Z","date":"2024-02-16","kind":"grant","planned":false,"acquired":true,"shares":160000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"1/48th of the shares subject to the option vest on each monthly anniversary measured from February 16, 2024 (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":160000,"derivative":{"exercise_price":5.13,"expiration_date":"2034-02-16","underlying":"Common Stock","underlying_shares":160000},"source":{"system":"sec-edgar","filing":"0001415889-24-004624","document":"form4-02212024_040214.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000141588924004624/form4-02212024_040214.xml","form_type":"4"}},{"id":1629606,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF BUSINESS OFFICER"}}],"security":"Common Stock","published_at":"2024-02-21T16:31:41.000Z","date":"2024-02-20","kind":"sale","planned":false,"acquired":false,"shares":1951,"price":5.48,"value":10691.48,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The shares were sold to cover tax withholding obligations in connection with the vesting of RSUs."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades in prices ranging from $5.34 to $5.60, 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":85641,"source":{"system":"sec-edgar","filing":"0001415889-24-004624","document":"form4-02212024_040214.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000141588924004624/form4-02212024_040214.xml","form_type":"4"}},{"id":1629605,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF BUSINESS OFFICER"}}],"security":"Common Stock","published_at":"2024-02-21T16:31:41.000Z","date":"2024-02-16","kind":"grant","planned":false,"acquired":true,"shares":39000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Constitute restricted stock units (\"RSUs\") for which the Reporting Person is entitled to receive one (1) share of Common Stock for each RSU upon vesting. 1/3rd of the RSUs vest annually on February 16 of each year, with the first 1/3rd vesting on February 16, 2025."}],"balance_after":87592,"source":{"system":"sec-edgar","filing":"0001415889-24-004624","document":"form4-02212024_040214.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000141588924004624/form4-02212024_040214.xml","form_type":"4"}},{"id":1643397,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF BUSINESS OFFICER"}}],"security":"Common Stock","published_at":"2024-02-14T19:59:10.000Z","date":"2024-02-12","kind":"sale","planned":false,"acquired":false,"shares":1349,"price":5.53,"value":7459.97,"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 $5.33 to $5.715, 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 29,392 RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes 4,139 shares acquired on November 15, 2023, pursuant to the Issuer's Employee Stock Purchase Plan."}],"balance_after":48592,"source":{"system":"sec-edgar","filing":"0001415889-24-003857","document":"form4-02152024_120202.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000141588924003857/form4-02152024_120202.xml","form_type":"4"}},{"id":1673162,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & Chief Business Officer"}}],"security":"Common Stock","published_at":"2024-01-23T16:58:39.000Z","date":"2023-07-11","kind":"sale","planned":false,"acquired":false,"shares":978,"price":3.8361,"value":3751.7058,"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 $3.72 to $3.90, 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 33,559 RSUs."}],"balance_after":45802,"source":{"system":"sec-edgar","filing":"0001209191-24-002074","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000120919124002074/doc4.xml","form_type":"4"}},{"id":2003795,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf 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Reporting Person is entitled to receive one (1) share of Common Stock for each RSU upon vesting. 1/3rd of the RSUs vest annually on February 16 of each year, with the first 1/3rd vesting on February 16, 2024."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 36,684 RSUs."}],"balance_after":46780,"source":{"system":"sec-edgar","filing":"0001567619-23-003425","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000156761923003425/doc1.xml","form_type":"4"}},{"id":2013744,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & Chief Business 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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 7,575 shares acquired pursuant to the Issuer's Employee Stock Purchase Plan on November 15, 2022."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes 17,709 restricted stock units."}],"balance_after":27949,"source":{"system":"sec-edgar","filing":"0001567619-23-003095","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000156761923003095/doc1.xml","form_type":"4"}},{"id":2208087,"issuer":{"id":5011,"kind":"organization","name":"Annexon, 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Person is entitled to receive one (1) share of Common Stock for each RSU upon vesting. 1/3rd of the RSUs vest annually on July 11th of each year, with the first 1/3rd vesting on July 11, 2023."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 21,875 RSUs."}],"balance_after":21875,"source":{"system":"sec-edgar","filing":"0001567619-22-013999","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000156761922013999/doc1.xml","form_type":"4"}},{"id":2394742,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & Chief Business Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2022-02-15T16:38:29.000Z","date":"2022-02-11","kind":"grant","acquired":true,"shares":100000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"1/48th of the shares subject to the option vest on each monthly anniversary measured from February 11, 2022 (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":100000,"derivative":{"exercise_price":6.94,"expiration_date":"2032-02-11","underlying":"Common 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Reporting Person is entitled to receive one (1) share of Common Stock for each RSU upon vesting. 1/3rd of the RSUs vest annually on February 11 of each year, with the first 1/3rd vesting on February 11, 2023."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 12,500 RSUs."}],"balance_after":12500,"source":{"system":"sec-edgar","filing":"0001567619-22-004614","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000156761922004614/doc1.xml","form_type":"4"}},{"id":2826914,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & Chief Business 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Stock","underlying_shares":115000},"source":{"system":"sec-edgar","filing":"0001567619-21-005220","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000156761921005220/doc1.xml","form_type":"4"}},{"id":3076306,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62842,"kind":"person","name":"Overdorf Michael","position":1,"cik":"0001818522","reported_name":"Overdorf Michael","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & Chief Business Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2020-07-24T16:23:34.000Z","date":"2020-07-23","kind":"grant","acquired":true,"shares":242905,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Reflects a 1-for-8.81 reverse stock split of the Issuer's outstanding common stock effected on July 17, 2020."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"25% of the shares subject to the option vest on the first anniversary measured from July 20, 2020 (the \"Vesting Commencement Date\"), and 1/48th of the total number of shares vest monthly thereafter, 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":242905,"derivative":{"exercise_price":17,"expiration_date":"2030-07-23","underlying":"Common Stock","underlying_shares":242905},"source":{"system":"sec-edgar","filing":"0001567619-20-013707","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818522/000156761920013707/doc1.xml","form_type":"4"}}]}