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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":170700,"source":{"system":"sec-edgar","filing":"0001465994-26-000003","document":"form4-03042026_040334.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000146599426000003/form4-03042026_040334.xml","form_type":"4"}},{"id":887979,"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":"Stock Option (Right to Buy)","published_at":"2026-02-24T00:03:49.000Z","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":"0001465994-26-000002","document":"form4-02242026_120245.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000146599426000002/form4-02242026_120245.xml","form_type":"4"}},{"id":887978,"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":"2026-02-24T00:03:49.000Z","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":176265,"source":{"system":"sec-edgar","filing":"0001465994-26-000002","document":"form4-02242026_120245.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000146599426000002/form4-02242026_120245.xml","form_type":"4"}},{"id":890569,"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":"2026-02-20T21:30:21.000Z","date":"2026-02-18","kind":"sale","planned":false,"acquired":false,"shares":7851,"price":5.11,"value":40118.61,"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 $4.925 to $5.17, 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":113765,"source":{"system":"sec-edgar","filing":"0001465994-26-000001","document":"form4-02202026_040201.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000146599426000001/form4-02202026_040201.xml","form_type":"4"}},{"id":1086467,"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":"2025-07-16T20:20:08.000Z","date":"2025-07-14","kind":"sale","planned":false,"acquired":false,"shares":1117,"price":2.58,"value":2881.86,"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 $2.58 to $2.61, 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":121616,"source":{"system":"sec-edgar","filing":"0001415889-25-019837","document":"form4-07162025_040704.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000141588925019837/form4-07162025_040704.xml","form_type":"4"}},{"id":1103691,"issuer":{"id":7063,"kind":"organization","name":"Boundless Bio, Inc."},"owners":[{"id":38158,"kind":"person","name":"Lew Jennifer","position":1,"cik":"0001465994","reported_name":"Lew Jennifer","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 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":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":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":1557529,"issuer":{"id":7063,"kind":"organization","name":"Boundless Bio, Inc."},"owners":[{"id":38158,"kind":"person","name":"Lew Jennifer","position":1,"cik":"0001465994","reported_name":"Lew Jennifer","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option","published_at":"2024-03-29T20:30:34.000Z","date":"2024-03-27","kind":"grant","planned":false,"acquired":true,"shares":13219,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The stock option vests in 36 substantially equal monthly installments beginning on April 27, 2024."}],"balance_after":13219,"derivative":{"exercise_price":16,"expiration_date":"2034-03-26","underlying":"Common Stock","underlying_shares":13219},"source":{"system":"sec-edgar","filing":"0000950170-24-038703","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000095017024038703/ownership.xml","form_type":"4"}},{"id":1629014,"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":"Stock Option (Right to Buy)","published_at":"2024-02-21T21:31:50.000Z","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":"0001415889-24-004623","document":"form4-02212024_040210.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000141588924004623/form4-02212024_040210.xml","form_type":"4"}},{"id":1629013,"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":"2024-02-21T21:31:50.000Z","date":"2024-02-20","kind":"sale","planned":false,"acquired":false,"shares":2593,"price":5.53,"value":14339.29,"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 $5.39 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":82058,"source":{"system":"sec-edgar","filing":"0001415889-24-004623","document":"form4-02212024_040210.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000141588924004623/form4-02212024_040210.xml","form_type":"4"}},{"id":1629012,"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":"2024-02-21T21:31:50.000Z","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":84651,"source":{"system":"sec-edgar","filing":"0001415889-24-004623","document":"form4-02212024_040210.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000141588924004623/form4-02212024_040210.xml","form_type":"4"}},{"id":1643110,"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":"2024-02-15T00:54:47.000Z","date":"2024-02-12","kind":"sale","planned":false,"acquired":false,"shares":1809,"price":5.54,"value":10021.86,"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 $5.70, 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."}],"balance_after":45651,"source":{"system":"sec-edgar","filing":"0001415889-24-003855","document":"form4-02152024_120234.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000141588924003855/form4-02152024_120234.xml","form_type":"4"}},{"id":1672964,"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":"2024-01-23T21:57:19.000Z","date":"2023-07-11","kind":"sale","planned":false,"acquired":false,"shares":1057,"price":3.8361,"value":4054.7577,"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":47460,"source":{"system":"sec-edgar","filing":"0001209191-24-002072","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000120919124002072/doc4.xml","form_type":"4"}},{"id":2003348,"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 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Stock","underlying_shares":77050},"source":{"system":"sec-edgar","filing":"0001567619-23-003424","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761923003424/doc1.xml","form_type":"4"}},{"id":2003347,"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":"2023-02-21T22:26:07.000Z","date":"2023-02-16","kind":"grant","acquired":true,"shares":18975,"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, 2024."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 36,684 RSUs."}],"balance_after":48517,"source":{"system":"sec-edgar","filing":"0001567619-23-003424","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761923003424/doc1.xml","form_type":"4"}},{"id":2013497,"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":"2023-02-15T23:59:57.000Z","date":"2023-02-14","kind":"sale","acquired":false,"shares":166,"price":6.303,"value":1046.298,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The shares were sold to cover tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes 17,709 restricted stock units."}],"balance_after":29542,"source":{"system":"sec-edgar","filing":"0001567619-23-003094","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761923003094/doc1.xml","form_type":"4"}},{"id":2013496,"issuer":{"id":5011,"kind":"organization","name":"Annexon, Inc.","symbol":"ANNX"},"owners":[{"id":38158,"kind":"person","name":"Lew 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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":29708,"source":{"system":"sec-edgar","filing":"0001567619-23-003094","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761923003094/doc1.xml","form_type":"4"}},{"id":2208007,"issuer":{"id":5011,"kind":"organization","name":"Annexon, 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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":23875,"source":{"system":"sec-edgar","filing":"0001567619-22-013991","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761922013991/doc1.xml","form_type":"4"}},{"id":2394379,"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":"Stock Option (Right to Buy)","published_at":"2022-02-15T21:36:28.000Z","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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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":14500,"source":{"system":"sec-edgar","filing":"0001567619-22-004612","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761922004612/doc1.xml","form_type":"4"}},{"id":2569262,"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":"Stock Option (Right 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Reporting Person's Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $20.00 to $20.06, 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":2000,"source":{"system":"sec-edgar","filing":"0001567619-21-017165","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761921017165/doc1.xml","form_type":"4"}},{"id":2569260,"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":"2021-09-15T22:35:08.000Z","date":"2021-09-13","kind":"exercise","acquired":true,"shares":3500,"price":7.4885,"value":26209.75,"ownership":{"direct":true},"balance_after":5500,"source":{"system":"sec-edgar","filing":"0001567619-21-017165","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761921017165/doc1.xml","form_type":"4"}},{"id":2688863,"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":"Stock Option (Right to Buy)","published_at":"2021-06-01T22:01:25.000Z","date":"2021-05-27","kind":"exercise","acquired":false,"shares":3500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"25% of the shares subject to the option vest on the first anniversary measured from June 3, 2019 (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":147293,"derivative":{"exercise_price":7.4885,"expiration_date":"2029-06-20","underlying":"Common Stock","underlying_shares":3500},"source":{"system":"sec-edgar","filing":"0001567619-21-011453","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761921011453/doc1.xml","form_type":"4"}},{"id":2688862,"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":"2021-06-01T22:01:25.000Z","date":"2021-05-27","kind":"sale","acquired":false,"shares":3500,"price":22.2386,"value":77835.1,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $21.78 to $22.67, 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":2000,"source":{"system":"sec-edgar","filing":"0001567619-21-011453","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761921011453/doc1.xml","form_type":"4"}},{"id":2688861,"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":"2021-06-01T22:01:25.000Z","date":"2021-05-27","kind":"exercise","acquired":true,"shares":3500,"price":7.4885,"value":26209.75,"ownership":{"direct":true},"balance_after":5500,"source":{"system":"sec-edgar","filing":"0001567619-21-011453","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761921011453/doc1.xml","form_type":"4"}},{"id":2771873,"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":"Stock Option (Right to Buy)","published_at":"2021-03-25T23:31:59.000Z","date":"2021-03-23","kind":"exercise","acquired":false,"shares":5000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"25% of the shares subject to the option vest on the first anniversary measured from June 3, 2019 (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":150793,"derivative":{"exercise_price":7.4885,"expiration_date":"2029-06-20","underlying":"Common Stock","underlying_shares":5000},"source":{"system":"sec-edgar","filing":"0001567619-21-006986","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761921006986/doc1.xml","form_type":"4"}},{"id":2771872,"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":"2021-03-25T23:31:59.000Z","date":"2021-03-23","kind":"sale","acquired":false,"shares":1800,"price":29.1629,"value":52493.22,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades in prices ranging from $28.98 to $29.61, 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":2000,"source":{"system":"sec-edgar","filing":"0001567619-21-006986","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761921006986/doc1.xml","form_type":"4"}},{"id":2771871,"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":"2021-03-25T23:31:59.000Z","date":"2021-03-23","kind":"sale","acquired":false,"shares":1800,"price":28.4304,"value":51174.72,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades in prices ranging from $27.97 to $28.965, 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":3800,"source":{"system":"sec-edgar","filing":"0001567619-21-006986","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761921006986/doc1.xml","form_type":"4"}},{"id":2771870,"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":"2021-03-25T23:31:59.000Z","date":"2021-03-23","kind":"sale","acquired":false,"shares":1400,"price":27.5061,"value":38508.54,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $26.94 to $27.93, 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":5600,"source":{"system":"sec-edgar","filing":"0001567619-21-006986","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1465994/000156761921006986/doc1.xml","form_type":"4"}},{"id":2771869,"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 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