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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":689008,"issuer":{"id":5011,"kind":"organization","name":"Annexon, 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(\"Alerce Medical\"). The Reporting Person has sole voting and dispositive power over the shares held by Alerce Medical. The Reporting Person disclaims beneficial ownership of the shares except to the extent of his pecuniary interest therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"As of May 28, 2026, includes (a) 240,000 shares that are held by the Muneer A. Satter Revocable Trust for which the Reporting Person serves as trustee and, in such capacity, has sole voting and dispositive power over all such shares, (b) 567,240 shares that are held by various other trusts and entities for which the Reporting Person serves as trustee, investment advisor or manager, as applicable, and, in each such capacity, has sole voting and dispositive power over all such shares, (c) 1,147,738 shares that are held by Satter Medical Technology Partners, L.P. for which the Reporting Person has sole voting and dispositive power over all such shares and (d) 8,387,156 shares that are held by Alerce Medical for which the Reporting Person has sole voting and dispositive power over all such shares. The Reporting Person disclaims beneficial ownership of all shares included under (b), (c) and (d) of this footnote, except to the extent of his pecuniary interest therein."}],"balance_after":10342134,"source":{"system":"sec-edgar","filing":"0001315797-26-000001","document":"form4-05292026_090557.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1315797/000131579726000001/form4-05292026_090557.xml","form_type":"4"}},{"id":780468,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38056,"kind":"person","name":"Carson William H.","position":1,"cik":"0001824280","reported_name":"Carson William H.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-13T20:30:11.000Z","date":"2026-05-11","kind":"purchase","planned":true,"acquired":true,"shares":8000,"price":5.78,"value":46240.0,"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, adopted December 8, 2025."}],"balance_after":78405,"source":{"system":"sec-edgar","filing":"0001824280-26-000004","document":"form4-05132026_040507.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000182428026000004/form4-05132026_040507.xml","form_type":"4"}},{"id":808629,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38056,"kind":"person","name":"Carson William H.","position":1,"cik":"0001824280","reported_name":"Carson William H.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-04-14T20:16:40.000Z","date":"2026-04-10","kind":"purchase","planned":true,"acquired":true,"shares":8000,"price":6.2,"value":49600.0,"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, adopted December 8, 2025."}],"balance_after":70405,"source":{"system":"sec-edgar","filing":"0001824280-26-000003","document":"form4-04142026_080436.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000182428026000003/form4-04142026_080436.xml","form_type":"4"}},{"id":845646,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38056,"kind":"person","name":"Carson William H.","position":1,"cik":"0001824280","reported_name":"Carson William H.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-03-12T20:31:34.000Z","date":"2026-03-10","kind":"purchase","planned":true,"acquired":true,"shares":8000,"price":5.67,"value":45360.0,"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, adopted December 8, 2025."}],"balance_after":62405,"source":{"system":"sec-edgar","filing":"0001824280-26-000002","document":"form4-03122026_040329.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000182428026000002/form4-03122026_040329.xml","form_type":"4"}},{"id":860790,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62769,"kind":"person","name":"Dananberg Jamie","position":1,"cik":"0001734424","reported_name":"Dananberg Jamie","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF MEDICAL OFFICER"}}],"security":"Common Stock","published_at":"2026-03-04T21:30:46.000Z","date":"2026-03-02","kind":"sale","planned":false,"acquired":false,"shares":5820,"price":5.43,"value":31602.6,"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 $5.36 to $5.57, 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":123582,"source":{"system":"sec-edgar","filing":"0001734424-26-000003","document":"form4-03042026_040342.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000173442426000003/form4-03042026_040342.xml","form_type":"4"}},{"id":861839,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38211,"kind":"person","name":"Yednock Ted","position":1,"cik":"0001818525","reported_name":"Yednock Ted","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF INNOVATION OFFICER"}}],"security":"Common Stock","published_at":"2026-03-04T21:30:44.000Z","date":"2026-03-02","kind":"sale","planned":false,"acquired":false,"shares":5566,"price":5.42,"value":30167.72,"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 $5.35 to $5.57, 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":154161,"source":{"system":"sec-edgar","filing":"0001818525-26-000003","document":"form4-03042026_040338.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000181852526000003/form4-03042026_040338.xml","form_type":"4"}},{"id":860789,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62768,"kind":"person","name":"ARTIS DEAN RICHARD","position":1,"cik":"0001958523","reported_name":"ARTIS DEAN RICHARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF SCIENTIFIC OFFICER"}}],"security":"Common Stock","published_at":"2026-03-04T21:30:41.000Z","date":"2026-03-02","kind":"sale","planned":false,"acquired":false,"shares":5894,"price":5.43,"value":32004.42,"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 $5.35 to $5.56, 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":180093,"source":{"system":"sec-edgar","filing":"0001958523-26-000003","document":"form4-03042026_040336.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000195852326000003/form4-03042026_040336.xml","form_type":"4"}},{"id":861378,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38158,"kind":"person","name":"Lew Jennifer","position":1,"cik":"0001465994","reported_name":"Lew Jennifer","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-03-04T21:30:38.000Z","date":"2026-03-02","kind":"sale","planned":false,"acquired":false,"shares":5565,"price":5.42,"value":30162.3,"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 $5.34 to $5.57, inclusive. The price reported in Column 4 above reflects the weighted average sale price. 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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 sold at each respective price within the range set forth in this footnote."}],"balance_after":97227,"source":{"system":"sec-edgar","filing":"0001818525-26-000001","document":"form4-02202026_040207.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000181852526000001/form4-02202026_040207.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":954915,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38056,"kind":"person","name":"Carson William H.","position":1,"cik":"0001824280","reported_name":"Carson William H.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-01-02T21:30:06.000Z","date":"2025-12-30","kind":"purchase","planned":true,"acquired":true,"shares":4115,"price":5.02,"value":20657.3,"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, adopted March 17, 2025."}],"balance_after":54405,"source":{"system":"sec-edgar","filing":"0001824280-26-000001","document":"form4-01022026_040103.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000182428026000001/form4-01022026_040103.xml","form_type":"4"}},{"id":981143,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38057,"kind":"person","name":"Choi Jung","position":1,"cik":"0001650126","reported_name":"Choi Jung","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-03T21:30:20.000Z","date":"2025-12-01","kind":"purchase","planned":false,"acquired":true,"shares":33000,"price":4.19,"value":138270.0,"ownership":{"direct":false,"nature":"By Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades in prices ranging from $4.165 to $4.215, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are held by The Park Family Revocable Trust. The Reporting Person and her spouse are co-trustees of the trust."}],"balance_after":33000,"source":{"system":"sec-edgar","filing":"0001650126-25-000005","document":"form4-12032025_041212.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000165012625000005/form4-12032025_041212.xml","form_type":"4"}},{"id":981142,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38056,"kind":"person","name":"Carson William H.","position":1,"cik":"0001824280","reported_name":"Carson William H.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-12-03T21:30:14.000Z","date":"2025-12-01","kind":"purchase","planned":true,"acquired":true,"shares":4115,"price":4.47,"value":18394.05,"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, adopted March 17, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $4.43 to $4.50, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."}],"balance_after":50290,"source":{"system":"sec-edgar","filing":"0001824280-25-000007","document":"form4-12032025_041210.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000182428025000007/form4-12032025_041210.xml","form_type":"4"}},{"id":991139,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38088,"kind":"person","name":"Satter Muneer A","position":1,"cik":"0001315797","reported_name":"Satter Muneer A","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-11-22T02:52:02.000Z","date":"2025-11-21","kind":"purchase","planned":false,"acquired":true,"shares":422613,"price":4.28,"value":1808783.64,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"All shares were purchased by Alerce Medical Technology Partners, L.P. (\"Alerce Medical\"). The Reporting Person has sole voting and dispositive power over the shares held by Alerce Medical. The Reporting Person disclaims beneficial ownership of the shares except to the extent of his pecuniary interest therein."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades in prices ranging from $4.165 to $4.415, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"As of November 21, 2025, includes (a) 240,000 shares that are held by the Muneer A. Satter Revocable Trust for which the Reporting Person serves as trustee and, in such capacity, has sole voting and dispositive power over all such shares, (b) 567,240 shares that are held by various other trusts and entities for which the Reporting Person serves as trustee, investment advisor or manager, as applicable, and, in each such capacity, has sole voting and dispositive power over all such shares, (c) 1,147,738 shares that are held by Satter Medical Technology Partners, L.P. for which the Reporting Person has sole voting and dispositive power over all such shares and (d) 7,773,659 shares that are held by Alerce Medical for which the Reporting Person has sole voting and dispositive power over all such shares. The Reporting Person disclaims beneficial ownership of all shares included under (b), (c) and (d) of this footnote, except to the extent of his pecuniary interest therein."}],"balance_after":9728637,"source":{"system":"sec-edgar","filing":"0001315797-25-000007","document":"form4-11222025_021158.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1315797/000131579725000007/form4-11222025_021158.xml","form_type":"4"}},{"id":991138,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38088,"kind":"person","name":"Satter Muneer A","position":1,"cik":"0001315797","reported_name":"Satter Muneer A","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-11-22T02:52:02.000Z","date":"2025-11-20","kind":"purchase","planned":false,"acquired":true,"shares":400000,"price":4.48,"value":1792000.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"All shares were purchased by Alerce Medical Technology Partners, L.P. (\"Alerce Medical\"). The Reporting Person has sole voting and dispositive power over the shares held by Alerce Medical. The Reporting Person disclaims beneficial ownership of the shares except to the extent of his pecuniary interest therein."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $4.25 to $5.065, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"As of November 21, 2025, includes (a) 240,000 shares that are held by the Muneer A. Satter Revocable Trust for which the Reporting Person serves as trustee and, in such capacity, has sole voting and dispositive power over all such shares, (b) 567,240 shares that are held by various other trusts and entities for which the Reporting Person serves as trustee, investment advisor or manager, as applicable, and, in each such capacity, has sole voting and dispositive power over all such shares, (c) 1,147,738 shares that are held by Satter Medical Technology Partners, L.P. for which the Reporting Person has sole voting and dispositive power over all such shares and (d) 7,773,659 shares that are held by Alerce Medical for which the Reporting Person has sole voting and dispositive power over all such shares. The Reporting Person disclaims beneficial ownership of all shares included under (b), (c) and (d) of this footnote, except to the extent of his pecuniary interest therein."}],"balance_after":9306024,"source":{"system":"sec-edgar","filing":"0001315797-25-000007","document":"form4-11222025_021158.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1315797/000131579725000007/form4-11222025_021158.xml","form_type":"4"}},{"id":993577,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38088,"kind":"person","name":"Satter Muneer A","position":1,"cik":"0001315797","reported_name":"Satter Muneer A","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-11-20T02:00:05.000Z","date":"2025-11-19","kind":"purchase","planned":false,"acquired":true,"shares":500000,"price":3.94,"value":1970000.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"All shares were purchased by Alerce Medical Technology Partners, L.P. (\"Alerce Medical\"). The Reporting Person has sole voting and dispositive power over the shares held by Alerce Medical. The Reporting Person disclaims beneficial ownership of the shares except to the extent of his pecuniary interest therein."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"This transaction was executed in multiple trades in prices ranging from $3.57 to $4.19, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"As of November 19, 2025, includes (a) 240,000 shares that are held by the Muneer A. Satter Revocable Trust for which the Reporting Person serves as trustee and, in such capacity, has sole voting and dispositive power over all such shares, (b) 567,240 shares that are held by various other trusts and entities for which the Reporting Person serves as trustee, investment advisor or manager, as applicable, and, in each such capacity, has sole voting and dispositive power over all such shares, (c) 1,147,738 shares that are held by Satter Medical Technology Partners, L.P. for which the Reporting Person has sole voting and dispositive power over all such shares and (d) 6,951,046 shares that are held by Alerce Medical for which the Reporting Person has sole voting and dispositive power over all such shares. The Reporting Person disclaims beneficial ownership of all shares included under (b), (c) and (d) of this footnote, except to the extent of his pecuniary interest therein."}],"balance_after":8906024,"source":{"system":"sec-edgar","filing":"0001315797-25-000006","document":"form4-11192025_091101.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1315797/000131579725000006/form4-11192025_091101.xml","form_type":"4"}},{"id":993576,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38088,"kind":"person","name":"Satter Muneer A","position":1,"cik":"0001315797","reported_name":"Satter Muneer A","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-11-20T02:00:05.000Z","date":"2025-11-18","kind":"purchase","planned":false,"acquired":true,"shares":500000,"price":3.18,"value":1590000.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"All shares were purchased by Alerce Medical Technology Partners, L.P. (\"Alerce Medical\"). The Reporting Person has sole voting and dispositive power over the shares held by Alerce Medical. The Reporting Person disclaims beneficial ownership of the shares except to the extent of his pecuniary interest therein."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades in prices ranging from $3.01 to $3.285, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"As of November 19, 2025, includes (a) 240,000 shares that are held by the Muneer A. Satter Revocable Trust for which the Reporting Person serves as trustee and, in such capacity, has sole voting and dispositive power over all such shares, (b) 567,240 shares that are held by various other trusts and entities for which the Reporting Person serves as trustee, investment advisor or manager, as applicable, and, in each such capacity, has sole voting and dispositive power over all such shares, (c) 1,147,738 shares that are held by Satter Medical Technology Partners, L.P. for which the Reporting Person has sole voting and dispositive power over all such shares and (d) 6,951,046 shares that are held by Alerce Medical for which the Reporting Person has sole voting and dispositive power over all such shares. The Reporting Person disclaims beneficial ownership of all shares included under (b), (c) and (d) of this footnote, except to the extent of his pecuniary interest therein."}],"balance_after":8406024,"source":{"system":"sec-edgar","filing":"0001315797-25-000006","document":"form4-11192025_091101.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1315797/000131579725000006/form4-11192025_091101.xml","form_type":"4"}},{"id":993575,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38088,"kind":"person","name":"Satter Muneer A","position":1,"cik":"0001315797","reported_name":"Satter Muneer A","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-11-20T02:00:05.000Z","date":"2025-11-17","kind":"purchase","planned":false,"acquired":true,"shares":500000,"price":2.99,"value":1495000.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"All shares were purchased by Alerce Medical Technology Partners, L.P. (\"Alerce Medical\"). The Reporting Person has sole voting and dispositive power over the shares held by Alerce Medical. The Reporting Person disclaims beneficial ownership of the shares except to the extent of his pecuniary interest therein."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $2.695 to $3.115, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"As of November 19, 2025, includes (a) 240,000 shares that are held by the Muneer A. Satter Revocable Trust for which the Reporting Person serves as trustee and, in such capacity, has sole voting and dispositive power over all such shares, (b) 567,240 shares that are held by various other trusts and entities for which the Reporting Person serves as trustee, investment advisor or manager, as applicable, and, in each such capacity, has sole voting and dispositive power over all such shares, (c) 1,147,738 shares that are held by Satter Medical Technology Partners, L.P. for which the Reporting Person has sole voting and dispositive power over all such shares and (d) 6,951,046 shares that are held by Alerce Medical for which the Reporting Person has sole voting and dispositive power over all such shares. The Reporting Person disclaims beneficial ownership of all shares included under (b), (c) and (d) of this footnote, except to the extent of his pecuniary interest therein."}],"balance_after":7906024,"source":{"system":"sec-edgar","filing":"0001315797-25-000006","document":"form4-11192025_091101.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1315797/000131579725000006/form4-11192025_091101.xml","form_type":"4"}},{"id":1010453,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38056,"kind":"person","name":"Carson William H.","position":1,"cik":"0001824280","reported_name":"Carson William H.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-31T20:15:07.000Z","date":"2025-10-30","kind":"purchase","planned":true,"acquired":true,"shares":4115,"price":3.17,"value":13044.55,"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, adopted March 17, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $3.15 o $3.20, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."}],"balance_after":46175,"source":{"system":"sec-edgar","filing":"0001824280-25-000006","document":"form4-10312025_041004.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000182428025000006/form4-10312025_041004.xml","form_type":"4"}},{"id":1026570,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38056,"kind":"person","name":"Carson William H.","position":1,"cik":"0001824280","reported_name":"Carson William H.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-02T20:17:02.000Z","date":"2025-09-30","kind":"purchase","planned":true,"acquired":true,"shares":4115,"price":3.05,"value":12550.75,"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, adopted March 17, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $3.035 o $3.08, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."}],"balance_after":42060,"source":{"system":"sec-edgar","filing":"0001824280-25-000005","document":"form4-10022025_081058.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000182428025000005/form4-10022025_081058.xml","form_type":"4"}},{"id":1047604,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38056,"kind":"person","name":"Carson William H.","position":1,"cik":"0001824280","reported_name":"Carson William H.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-09-04T20:30:24.000Z","date":"2025-09-02","kind":"purchase","planned":true,"acquired":true,"shares":4115,"price":2.09,"value":8600.35,"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, adopted March 17, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $2.06 to $2.115, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."}],"balance_after":37945,"source":{"system":"sec-edgar","filing":"0001415889-25-023679","document":"form4-09042025_040906.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000141588925023679/form4-09042025_040906.xml","form_type":"4"}},{"id":1077394,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38056,"kind":"person","name":"Carson William H.","position":1,"cik":"0001824280","reported_name":"Carson William H.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-01T20:30:24.000Z","date":"2025-07-30","kind":"purchase","planned":true,"acquired":true,"shares":4115,"price":2.43,"value":9999.45,"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, adopted March 17, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $2.37 to $2.44, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."}],"balance_after":33830,"source":{"system":"sec-edgar","filing":"0001415889-25-020861","document":"form4-08012025_040819.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000141588925020861/form4-08012025_040819.xml","form_type":"4"}},{"id":1086624,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38211,"kind":"person","name":"Yednock Ted","position":1,"cik":"0001818525","reported_name":"Yednock Ted","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF INNOVATION OFFICER"}}],"security":"Common Stock","published_at":"2025-07-16T20:20:10.000Z","date":"2025-07-14","kind":"sale","planned":false,"acquired":false,"shares":1116,"price":2.58,"value":2879.28,"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. 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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":1255188,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62769,"kind":"person","name":"Dananberg Jamie","position":1,"cik":"0001734424","reported_name":"Dananberg Jamie","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF MEDICAL OFFICER"}}],"security":"Common 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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":33479,"source":{"system":"sec-edgar","filing":"0001415889-25-004891","document":"form4-02202025_090205.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000141588925004891/form4-02202025_090205.xml","form_type":"4"}},{"id":1255189,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":62768,"kind":"person","name":"ARTIS DEAN RICHARD","position":1,"cik":"0001958523","reported_name":"ARTIS DEAN RICHARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF SCIENTIFIC OFFICER"}}],"security":"Common Stock","published_at":"2025-02-20T21:52:34.000Z","date":"2025-02-18","kind":"sale","planned":false,"acquired":false,"shares":5515,"price":2.97,"value":16379.55,"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 $2.86 to $3.1376, 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":83814,"source":{"system":"sec-edgar","filing":"0001415889-25-004889","document":"form4-02202025_090227.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000141588925004889/form4-02202025_090227.xml","form_type":"4"}},{"id":1255987,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38211,"kind":"person","name":"Yednock Ted","position":1,"cik":"0001818525","reported_name":"Yednock Ted","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF INNOVATION OFFICER"}}],"security":"Common Stock","published_at":"2025-02-20T21:51:10.000Z","date":"2025-02-18","kind":"sale","planned":false,"acquired":false,"shares":8345,"price":2.91,"value":24283.95,"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 $2.77 to $3.1376, 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":61237,"source":{"system":"sec-edgar","filing":"0001415889-25-004888","document":"form4-02202025_090206.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588925004888/form4-02202025_090206.xml","form_type":"4"}},{"id":1255622,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38158,"kind":"person","name":"Lew Jennifer","position":1,"cik":"0001465994","reported_name":"Lew Jennifer","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-02-20T21:48:06.000Z","date":"2025-02-18","kind":"sale","planned":false,"acquired":false,"shares":6912,"price":2.92,"value":20183.04,"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 $2.79 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":77770,"source":{"system":"sec-edgar","filing":"0001415889-25-004886","document":"form4-02202025_090202.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000141588925004886/form4-02202025_090202.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":1263684,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38158,"kind":"person","name":"Lew Jennifer","position":1,"cik":"0001465994","reported_name":"Lew Jennifer","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-02-18T21:30:11.000Z","date":"2025-02-13","kind":"sale","planned":false,"acquired":false,"shares":1786,"price":2.98,"value":5322.28,"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 $2.89 to $3.015, 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":84682,"source":{"system":"sec-edgar","filing":"0001415889-25-004433","document":"form4-02182025_040205.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000141588925004433/form4-02182025_040205.xml","form_type":"4"}},{"id":1263955,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38211,"kind":"person","name":"Yednock Ted","position":1,"cik":"0001818525","reported_name":"Yednock Ted","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF INNOVATION OFFICER"}}],"security":"Common Stock","published_at":"2025-02-18T21:30:09.000Z","date":"2025-02-13","kind":"sale","planned":false,"acquired":false,"shares":1783,"price":2.99,"value":5331.17,"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 $2.895 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":69582,"source":{"system":"sec-edgar","filing":"0001415889-25-004432","document":"form4-02182025_040203.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588925004432/form4-02182025_040203.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":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":1304970,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":1941,"kind":"person","name":"JONES WILLIAM A JR","position":1,"cik":"0001373097","reported_name":"JONES WILLIAM A JR","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to 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The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."}],"balance_after":25600,"source":{"system":"sec-edgar","filing":"0001415889-24-028316","document":"form4-12042024_111242.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000141588924028316/form4-12042024_111242.xml","form_type":"4"}},{"id":1378277,"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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2024."}],"balance_after":71365,"source":{"system":"sec-edgar","filing":"0001415889-24-025382","document":"form4-10172024_091004.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588924025382/form4-10172024_091004.xml","form_type":"4"}},{"id":1384892,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38211,"kind":"person","name":"Yednock Ted","position":1,"cik":"0001818525","reported_name":"Yednock Ted","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF INNOVATION OFFICER"}}],"security":"Common Stock","published_at":"2024-10-17T21:09:07.000Z","date":"2024-10-15","kind":"exercise","planned":true,"acquired":true,"shares":5408,"price":1.8501,"value":10005.3408,"ownership":{"direct":true},"balance_after":76773,"source":{"system":"sec-edgar","filing":"0001415889-24-025382","document":"form4-10172024_091004.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588924025382/form4-10172024_091004.xml","form_type":"4"}},{"id":1393799,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38056,"kind":"person","name":"Carson William H.","position":1,"cik":"0001824280","reported_name":"Carson William H.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-10-02T20:15:17.000Z","date":"2024-10-01","kind":"purchase","planned":true,"acquired":true,"shares":3200,"price":5.97,"value":19104.0,"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, adopted January 4, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $5.765 to $6.16, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."}],"balance_after":22400,"source":{"system":"sec-edgar","filing":"0001415889-24-024384","document":"form4-10022024_041010.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000141588924024384/form4-10022024_041010.xml","form_type":"4"}},{"id":1401670,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38211,"kind":"person","name":"Yednock Ted","position":1,"cik":"0001818525","reported_name":"Yednock Ted","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF INNOVATION OFFICER"}}],"security":"Common Stock","published_at":"2024-09-20T20:30:06.000Z","date":"2024-09-19","kind":"sale","planned":true,"acquired":false,"shares":4500,"price":7.1,"value":31950.0,"ownership":{"direct":false,"nature":"By Spouse"},"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, adopted April 12, 2024."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001415889-24-023771","document":"form4-09202024_040902.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588924023771/form4-09202024_040902.xml","form_type":"4"}},{"id":1406721,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38211,"kind":"person","name":"Yednock Ted","position":1,"cik":"0001818525","reported_name":"Yednock Ted","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF INNOVATION OFFICER"}}],"security":"Common Stock","published_at":"2024-09-16T20:30:08.000Z","date":"2024-09-12","kind":"sale","planned":true,"acquired":false,"shares":5500,"price":6.16,"value":33880.0,"ownership":{"direct":false,"nature":"By Spouse"},"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, adopted April 12, 2024."}],"balance_after":4500,"source":{"system":"sec-edgar","filing":"0001415889-24-023441","document":"form4-09162024_040901.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588924023441/form4-09162024_040901.xml","form_type":"4"}},{"id":1412806,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38211,"kind":"person","name":"Yednock Ted","position":1,"cik":"0001818525","reported_name":"Yednock Ted","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF INNOVATION OFFICER"}}],"security":"Common Stock","published_at":"2024-09-06T20:30:11.000Z","date":"2024-09-05","kind":"sale","planned":true,"acquired":false,"shares":5500,"price":5.64,"value":31020.0,"ownership":{"direct":false,"nature":"By Spouse"},"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, adopted April 12, 2024."}],"balance_after":10000,"source":{"system":"sec-edgar","filing":"0001415889-24-023018","document":"form4-09062024_040902.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588924023018/form4-09062024_040902.xml","form_type":"4"}},{"id":1415264,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38056,"kind":"person","name":"Carson William H.","position":1,"cik":"0001824280","reported_name":"Carson William H.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-09-04T20:34:40.000Z","date":"2024-09-03","kind":"purchase","planned":true,"acquired":true,"shares":3200,"price":5.48,"value":17536.0,"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, adopted January 4, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $5.38 to $5.70, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."}],"balance_after":19200,"source":{"system":"sec-edgar","filing":"0001415889-24-022785","document":"form4-09042024_040906.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000141588924022785/form4-09042024_040906.xml","form_type":"4"}},{"id":1419048,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38211,"kind":"person","name":"Yednock Ted","position":1,"cik":"0001818525","reported_name":"Yednock Ted","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF INNOVATION OFFICER"}}],"security":"Common Stock","published_at":"2024-08-30T22:00:12.000Z","date":"2024-08-29","kind":"sale","planned":true,"acquired":false,"shares":5500,"price":5.95,"value":32725.0,"ownership":{"direct":false,"nature":"By Spouse"},"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, adopted April 12, 2024."}],"balance_after":15500,"source":{"system":"sec-edgar","filing":"0001415889-24-022645","document":"form4-08302024_100809.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588924022645/form4-08302024_100809.xml","form_type":"4"}},{"id":1440451,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38056,"kind":"person","name":"Carson William H.","position":1,"cik":"0001824280","reported_name":"Carson William H.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-08-05T23:53:03.000Z","date":"2024-08-01","kind":"purchase","planned":true,"acquired":true,"shares":3200,"price":6.24,"value":19968.0,"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, adopted January 4, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $6.07 to $6.455, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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 purchased at each respective price within the range set forth in this footnote."}],"balance_after":16000,"source":{"system":"sec-edgar","filing":"0001415889-24-020789","document":"form4-08052024_110859.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000141588924020789/form4-08052024_110859.xml","form_type":"4"}},{"id":1452521,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38158,"kind":"person","name":"Lew Jennifer","position":1,"cik":"0001465994","reported_name":"Lew Jennifer","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2024-07-17T20:48:44.000Z","date":"2024-07-15","kind":"sale","planned":false,"acquired":false,"shares":1104,"price":6.03,"value":6657.12,"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 $5.97 to $6.04, 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 5,514 shares acquired on May 15, 2024, pursuant to the Issuer's Employee Stock Purchase Plan."}],"balance_after":86468,"source":{"system":"sec-edgar","filing":"0001415889-24-019678","document":"form4-07172024_080740.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000141588924019678/form4-07172024_080740.xml","form_type":"4"}},{"id":1452699,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38211,"kind":"person","name":"Yednock Ted","position":1,"cik":"0001818525","reported_name":"Yednock Ted","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & CHIEF INNOVATION OFFICER"}}],"security":"Common Stock","published_at":"2024-07-17T20:46:49.000Z","date":"2024-07-15","kind":"sale","planned":false,"acquired":false,"shares":1106,"price":6.02,"value":6658.12,"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 $5.97 to $6.04, 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":71365,"source":{"system":"sec-edgar","filing":"0001415889-24-019677","document":"form4-07172024_080745.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588924019677/form4-07172024_080745.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":1462192,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38056,"kind":"person","name":"Carson William H.","position":1,"cik":"0001824280","reported_name":"Carson William H.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-07-02T21:43:36.000Z","date":"2024-07-01","kind":"purchase","planned":true,"acquired":true,"shares":3200,"price":5,"value":16000.0,"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, adopted January 4, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $4.83 to $5.145, inclusive. The price reported in Column 4 above reflects the weighted average purchase 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":12800,"source":{"system":"sec-edgar","filing":"0001415889-24-018985","document":"form4-07022024_090733.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1528115/000141588924018985/form4-07022024_090733.xml","form_type":"4"}}],"next_cursor":"2024-07-02T21:43:36.000000Z,1462192"}