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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":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":888216,"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":"Stock Option (Right to Buy)","published_at":"2026-02-24T00:05:48.000Z","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":"0001818525-26-000002","document":"form4-02242026_120245.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000181852526000002/form4-02242026_120245.xml","form_type":"4"}},{"id":888215,"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":"2026-02-24T00:05:48.000Z","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":159727,"source":{"system":"sec-edgar","filing":"0001818525-26-000002","document":"form4-02242026_120245.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000181852526000002/form4-02242026_120245.xml","form_type":"4"}},{"id":890822,"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":"2026-02-20T21:30:11.000Z","date":"2026-02-18","kind":"sale","planned":false,"acquired":false,"shares":7857,"price":5.11,"value":40149.27,"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":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":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. 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":105084,"source":{"system":"sec-edgar","filing":"0001415889-25-019838","document":"form4-07162025_040706.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588925019838/form4-07162025_040706.xml","form_type":"4"}},{"id":1236060,"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":"Stock Option (Right to Buy)","published_at":"2025-03-03T21:48:43.000Z","date":"2025-02-27","kind":"grant","planned":false,"acquired":true,"shares":272575,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"1/48th of the shares subject to the option vest on each monthly anniversary measured from February 27, 2025 (the \"Vesting Commencement Date\"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date."}],"balance_after":272575,"derivative":{"exercise_price":2.5,"expiration_date":"2034-02-27","underlying":"Common Stock","underlying_shares":272575},"source":{"system":"sec-edgar","filing":"0001415889-25-006191","document":"form4-03032025_090340.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588925006191/form4-03032025_090340.xml","form_type":"4"}},{"id":1236059,"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":"2025-03-03T21:48:43.000Z","date":"2024-02-27","kind":"grant","planned":false,"acquired":true,"shares":44963,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Constitute restricted stock units (\"RSUs\") for which the Reporting Person is entitled to receive one (1) share of Common Stock for each RSU upon vesting. 1/3rd of the RSUs vest annually on February 27 of each year, with the first 1/3rd vesting on February 27, 2026."}],"balance_after":106200,"source":{"system":"sec-edgar","filing":"0001415889-25-006191","document":"form4-03032025_090340.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588925006191/form4-03032025_090340.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. 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The price reported in Column 4 above reflects the weighted average sale price. 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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":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":1629601,"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":"Stock Option (Right to Buy)","published_at":"2024-02-21T21:31:47.000Z","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":"0001415889-24-004625","document":"form4-02212024_040217.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588924004625/form4-02212024_040217.xml","form_type":"4"}},{"id":1629600,"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":"2024-02-21T21:31:47.000Z","date":"2024-02-20","kind":"sale","planned":false,"acquired":false,"shares":2604,"price":5.51,"value":14348.04,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The shares were sold to cover tax withholding obligations in connection with the vesting of RSUs."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades in prices ranging from $5.34 to $5.58, 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":72471,"source":{"system":"sec-edgar","filing":"0001415889-24-004625","document":"form4-02212024_040217.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588924004625/form4-02212024_040217.xml","form_type":"4"}},{"id":1629599,"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":"2024-02-21T21:31:47.000Z","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":75075,"source":{"system":"sec-edgar","filing":"0001415889-24-004625","document":"form4-02212024_040217.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588924004625/form4-02212024_040217.xml","form_type":"4"}},{"id":1643394,"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":"2024-02-15T00:52:33.000Z","date":"2024-02-12","kind":"sale","planned":false,"acquired":false,"shares":1810,"price":5.54,"value":10027.4,"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":36075,"source":{"system":"sec-edgar","filing":"0001415889-24-003854","document":"form4-02152024_120219.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000141588924003854/form4-02152024_120219.xml","form_type":"4"}},{"id":1673166,"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":"2024-01-23T22:00:49.000Z","date":"2023-12-27","kind":"sale","planned":true,"acquired":false,"shares":21000,"price":4.5222,"value":94966.2,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F5","text":"The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan, adopted March 28, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F3","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":"F4","text":"Includes 33,559 restricted stock units."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F6","text":"Column 5 is being amended to reflect the correct amount of securities beneficially owned following reported 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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":"F4","text":"Includes 33,559 restricted stock units."}],"balance_after":37885,"source":{"system":"sec-edgar","filing":"0001209191-24-002080","document":"doc4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000120919124002080/doc4a.xml","form_type":"4/A","original_submission_date":"2023-12-29"}},{"id":1698025,"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":"Stock Option (Right to Buy)","published_at":"2023-12-29T21:12:16.000Z","date":"2023-12-27","kind":"exercise","planned":true,"acquired":false,"shares":10385,"price":0,"value":0.0,"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 March 28, 2023."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The shares subject to the option vest are fully vested and exercisable."}],"balance_after":36000,"derivative":{"exercise_price":1.8501,"expiration_date":"2026-08-11","underlying":"Common Stock","underlying_shares":10385},"source":{"system":"sec-edgar","filing":"0001209191-23-059988","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000120919123059988/doc4.xml","form_type":"4"}},{"id":1698024,"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":"Stock Option (Right to Buy)","published_at":"2023-12-29T21:12:16.000Z","date":"2023-12-27","kind":"exercise","planned":true,"acquired":false,"shares":10615,"price":0,"value":0.0,"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 March 28, 2023."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The shares subject to the option vest are fully vested and exercisable."}],"balance_after":0,"derivative":{"exercise_price":1.4096,"expiration_date":"2025-01-22","underlying":"Common Stock","underlying_shares":10615},"source":{"system":"sec-edgar","filing":"0001209191-23-059988","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000120919123059988/doc4.xml","form_type":"4"}},{"id":1698023,"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":"2023-12-29T21:12:16.000Z","date":"2023-12-27","kind":"sale","planned":true,"acquired":false,"shares":21000,"price":4.5222,"value":94966.2,"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 28, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $4.50 to $4.58, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001209191-23-059988","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000120919123059988/doc4.xml","form_type":"4"}},{"id":1698022,"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 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The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001567619-21-017166","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000156761921017166/doc1.xml","form_type":"4"}},{"id":2569588,"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 Scientific Officer"}}],"security":"Common Stock","published_at":"2021-09-15T22:35:58.000Z","date":"2021-09-13","kind":"exercise","acquired":true,"shares":1190,"price":5.1098,"value":6080.662,"ownership":{"direct":true},"balance_after":16190,"source":{"system":"sec-edgar","filing":"0001567619-21-017166","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000156761921017166/doc1.xml","form_type":"4"}},{"id":2569587,"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 Scientific Officer"}}],"security":"Common Stock","published_at":"2021-09-15T22:35:58.000Z","date":"2021-09-13","kind":"exercise","acquired":true,"shares":15000,"price":1.4096,"value":21144.0,"ownership":{"direct":true},"balance_after":15000,"source":{"system":"sec-edgar","filing":"0001567619-21-017166","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000156761921017166/doc1.xml","form_type":"4"}},{"id":2679560,"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 Scientific Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2021-06-07T20:47:44.000Z","date":"2021-06-03","kind":"exercise","acquired":false,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The shares subject to the option vest are fully vested and exercisable."}],"balance_after":25615,"derivative":{"exercise_price":1.4096,"expiration_date":"2025-01-22","underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001567619-21-011776","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000156761921011776/doc1.xml","form_type":"4"}},{"id":2679559,"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 Scientific Officer"}}],"security":"Common Stock","published_at":"2021-06-07T20:47:44.000Z","date":"2021-06-03","kind":"sale","acquired":false,"shares":2184,"price":21.722,"value":47440.848,"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 $21.665 to $21.85, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001567619-21-011776","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000156761921011776/doc1.xml","form_type":"4"}},{"id":2679558,"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 Scientific Officer"}}],"security":"Common Stock","published_at":"2021-06-07T20:47:44.000Z","date":"2021-06-03","kind":"sale","acquired":false,"shares":12816,"price":21.4485,"value":274883.976,"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 $20.67 to $21.66, 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":2184,"source":{"system":"sec-edgar","filing":"0001567619-21-011776","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000156761921011776/doc1.xml","form_type":"4"}},{"id":2679557,"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 Scientific 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":237,"source":{"system":"sec-edgar","filing":"0001567619-21-007133","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000156761921007133/doc1.xml","form_type":"4"}},{"id":2769458,"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 Scientific Officer"}}],"security":"Common Stock","published_at":"2021-03-29T21:10:11.000Z","date":"2021-03-25","kind":"sale","acquired":false,"shares":10258,"price":28.5392,"value":292755.1136,"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 $27.91 to $28.89, 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":5917,"source":{"system":"sec-edgar","filing":"0001567619-21-007133","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000156761921007133/doc1.xml","form_type":"4"}},{"id":2769457,"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 Scientific Officer"}}],"security":"Common Stock","published_at":"2021-03-29T21:10:11.000Z","date":"2021-03-25","kind":"exercise","acquired":true,"shares":1175,"price":5.1098,"value":6004.015,"ownership":{"direct":true},"balance_after":16175,"source":{"system":"sec-edgar","filing":"0001567619-21-007133","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000156761921007133/doc1.xml","form_type":"4"}},{"id":2769456,"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 Scientific Officer"}}],"security":"Common Stock","published_at":"2021-03-29T21:10:11.000Z","date":"2021-03-25","kind":"exercise","acquired":true,"shares":15000,"price":1.4096,"value":21144.0,"ownership":{"direct":true},"balance_after":15000,"source":{"system":"sec-edgar","filing":"0001567619-21-007133","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000156761921007133/doc1.xml","form_type":"4"}},{"id":2826911,"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 Scientific Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2021-03-02T01:07:26.000Z","date":"2021-02-25","kind":"grant","acquired":true,"shares":115000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"1/48th of the shares subject to the option vest on each monthly anniversary measured from February 25, 2021 (the \"Vesting Commencement Date\"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date."}],"balance_after":115000,"derivative":{"exercise_price":30.07,"expiration_date":"2031-02-25","underlying":"Common Stock","underlying_shares":115000},"source":{"system":"sec-edgar","filing":"0001567619-21-005222","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1818525/000156761921005222/doc1.xml","form_type":"4"}}]}