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The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"acquired","element":"transactionAcquiredDisposedCode","label":"F1","text":"Sale of shares to cover personal income tax obligation upon settlement of restricted stock unit award"}],"balance_after":765068,"source":{"system":"sec-edgar","filing":"0001628280-24-010280","document":"wk-form4_1710191995.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828024010280/wk-form4_1710191995.xml","form_type":"4"}},{"id":1637698,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Appreciation Right","published_at":"2024-02-16T22:09:27.000Z","date":"2024-02-13","kind":"grant","planned":false,"acquired":true,"shares":1189578,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Stock Appreciation Right will vest and become exercisable in equal annual installments (rounding down to the nearest whole share, except for the last installment) on the first, second, and third anniversaries of February 13, 2024, subject to the Reporting Person remaining an employee of the Issuer through and including each applicable vesting date."}],"balance_after":1189578,"derivative":{"exercise_price":0.921,"expiration_date":"2034-02-13","underlying":"Common Stock","underlying_shares":1189578},"source":{"system":"sec-edgar","filing":"0001628280-24-005382","document":"wk-form4_1708121356.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828024005382/wk-form4_1708121356.xml","form_type":"4"}},{"id":1648827,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2024-02-12T22:05:01.000Z","date":"2024-02-12","kind":"sale","planned":false,"acquired":false,"shares":21695,"price":1.0091,"value":21892.4245,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 24, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. 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The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Of the shares of common stock reported, 202,474 shares represent restricted stock units."}],"balance_after":563537,"source":{"system":"sec-edgar","filing":"0001628280-23-007720","document":"wf-form4_167874040015507.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828023007720/wf-form4_167874040015507.xml","form_type":"4"}},{"id":2013250,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2023-02-15T22:11:50.000Z","date":"2023-02-13","kind":"sale","acquired":false,"shares":21695,"price":0.93,"value":20176.35,"ownership":{"direct":true},"footnotes":[{"field":"date","element":"transactionDate","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $0.92 to $0.98, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Of the shares of common stock reported, 312,869 shares represent unvested restricted stock units."}],"balance_after":613215,"source":{"system":"sec-edgar","filing":"0001628280-23-003755","document":"wf-form4_167649908953055.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828023003755/wf-form4_167649908953055.xml","form_type":"4"}},{"id":2120919,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Appreciation Right","published_at":"2022-11-09T21:21:46.000Z","date":"2022-11-07","kind":"grant","acquired":true,"shares":3438335,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Stock Appreciation Right will vest and become exercisable in equal annual installments (rounding down to the nearest whole share, except for the last installment) on the first, second, and third anniversaries of November 7, 2022, subject to the Reporting Person remaining an employee of the Issuer through and including each applicable vesting date."}],"balance_after":3438335,"derivative":{"exercise_price":1.8,"expiration_date":"2032-11-07","underlying":"Common Stock","underlying_shares":3438335},"source":{"system":"sec-edgar","filing":"0001628280-22-029259","document":"wf-form4_166802888801839.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828022029259/wf-form4_166802888801839.xml","form_type":"4"}},{"id":2177979,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2022-08-19T17:05:49.000Z","date":"2022-08-17","kind":"sale","acquired":false,"shares":13448,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $1.155 to $1.220, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range."},{"field":"acquired","element":"transactionAcquiredDisposedCode","label":"F2","text":"Sale of shares to cover personal income tax obligation upon settlement of restricted stock unit award"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Of the shares of common stock reported, 361,079 shares represent unvested restricted stock units."}],"balance_after":634910,"source":{"system":"sec-edgar","filing":"0001628280-22-023324","document":"wf-form4_166092873647049.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828022023324/wf-form4_166092873647049.xml","form_type":"4"}},{"id":2220922,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2022-06-27T20:09:05.000Z","date":"2022-06-24","kind":"sale","acquired":false,"shares":6724,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $1.06 to $1.10, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range."},{"field":"acquired","element":"transactionAcquiredDisposedCode","label":"F2","text":"Sale of shares to cover personal income tax obligation upon settlement of restricted stock unit award"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Of the shares of common stock reported, 390,962 shares represent unvested restricted stock units."}],"balance_after":648358,"source":{"system":"sec-edgar","filing":"0001628280-22-018043","document":"wf-form4_165636050509479.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828022018043/wf-form4_165636050509479.xml","form_type":"4"}},{"id":2227061,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2022-06-17T20:22:31.000Z","date":"2022-06-16","kind":"sale","acquired":false,"shares":6724,"ownership":{"direct":true},"footnotes":[{"field":"date","element":"transactionDate","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $1.03 to $1.12, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Of the shares of common stock reported, 405,903 shares represent unvested restricted stock units."}],"balance_after":655082,"source":{"system":"sec-edgar","filing":"0001628280-22-017436","document":"wf-form4_165549731713465.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828022017436/wf-form4_165549731713465.xml","form_type":"4"}},{"id":2241473,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2022-06-06T20:14:51.000Z","date":"2022-06-03","kind":"sale","acquired":false,"shares":6292,"price":1.21,"value":7613.32,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"shares","element":"transactionShares","label":"F2","text":"Sale of shares to cover personal income tax obligation upon settlement of restricted stock unit award"},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $1.19 to $1.23, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Of the shares of common stock reported, 420,884 shares represent unvested restricted stock units."}],"balance_after":661806,"source":{"system":"sec-edgar","filing":"0001628280-22-016336","document":"wf-form4_165454647747063.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828022016336/wf-form4_165454647747063.xml","form_type":"4"}},{"id":2364512,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2022-03-01T21:16:10.000Z","date":"2022-03-01","kind":"grant","acquired":true,"shares":220789,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Grant of restricted stock units to the Reporting Person under the Issuer's Amended and Restated 2017 Equity Incentive Plan with each restricted stock unit representing the right to receive one share of common stock on the applicable vesting date. No amount was paid upon the grant of the restricted stock units. The restricted stock units vest in two equal annual installments on March 1, 2023 and March 1, 2024, subject to the Reporting Person continuing to provide service as an employee of the Issuer through such date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Of the shares of common stock reported, 434,829 shares represent unvested restricted stock units."}],"balance_after":668098,"source":{"system":"sec-edgar","filing":"0001628280-22-004517","document":"wf-form4_164616931615259.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828022004517/wf-form4_164616931615259.xml","form_type":"4"}},{"id":2397270,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2022-02-14T21:20:24.000Z","date":"2022-02-11","kind":"sale","acquired":false,"shares":21695,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $1.52 to $1.74, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Of the shares of common stock reported, 214,037 shares represent unvested restricted stock units."}],"balance_after":447309,"source":{"system":"sec-edgar","filing":"0001628280-22-002506","document":"wf-form4_164487359327366.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828022002506/wf-form4_164487359327366.xml","form_type":"4"}},{"id":2595881,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-08-19T20:26:01.000Z","date":"2021-08-17","kind":"sale","acquired":false,"shares":13448,"price":5.1,"value":68584.8,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $4.98 to $5.35, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Of the shares of common stock reported, 262,246 shares represent unvested restricted stock units."}],"balance_after":469004,"source":{"system":"sec-edgar","filing":"0001628280-21-017331","document":"wf-form4_162940473895833.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828021017331/wf-form4_162940473895833.xml","form_type":"4"}},{"id":2631726,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-07-16T20:01:34.000Z","date":"2021-07-15","kind":"sale","acquired":false,"shares":13448,"price":5.78,"value":77729.44,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $5.64 to $5.94, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Of the shares of common stock reported, 292,131 shares represent unvested restricted stock units."}],"balance_after":482452,"source":{"system":"sec-edgar","filing":"0001628280-21-013959","document":"wf-form4_162646567293011.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828021013959/wf-form4_162646567293011.xml","form_type":"4"}},{"id":2654492,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-06-25T20:03:01.000Z","date":"2021-06-23","kind":"grant","acquired":true,"shares":44826,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units issued to the Reporting Person.  Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer and has no expiration date.  One third of the shares underlying the restricted stock unit award vested on June 23, 2021.  One third of the shares will vest on June 23, 2022, and one third of the shares will vest on June 23, 2023, subject to the Reporting Person providing continuous service to the Issuer on such dates.  Shares in respect of the vested portion of the award must be delivered no later than March 15 of the calendar year following the year in which vesting occurs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Of the shares of common stock reported, 292,130 shares represent unvested restricted stock units."}],"balance_after":495900,"source":{"system":"sec-edgar","filing":"0001628280-21-012931","document":"wf-form4_162465136608750.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828021012931/wf-form4_162465136608750.xml","form_type":"4"}},{"id":2663094,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-06-17T21:12:18.000Z","date":"2021-06-15","kind":"grant","acquired":true,"shares":44826,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units issued to the Reporting Person.  Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer and has no expiration date.  One third of the shares underlying the restricted stock unit award vested on June 15, 2021.  One third of the shares will vest on June 15, 2022, and one third of the shares will vest on June 15, 2023, subject to the Reporting Person providing continuous service to the Issuer on such dates.  Shares in respect of the vested portion of the award must be delivered no later than March 15 of the calendar year following the year in which vesting occurs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Of the shares of common stock reported, 262,246 shares represent unvested restricted stock units."}],"balance_after":451074,"source":{"system":"sec-edgar","filing":"0001628280-21-012476","document":"wf-form4_162396430850370.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828021012476/wf-form4_162396430850370.xml","form_type":"4"}},{"id":2685947,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-06-02T20:51:35.000Z","date":"2021-06-02","kind":"sale","acquired":false,"shares":2400,"price":9.5,"value":22800.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $9.40 to $9.62, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Of the shares of common stock reported, 232,361 shares represent unvested restricted stock units."}],"balance_after":406248,"source":{"system":"sec-edgar","filing":"0001628280-21-011531","document":"wf-form4_162266707489024.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828021011531/wf-form4_162266707489024.xml","form_type":"4"}},{"id":2685946,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-06-02T20:13:31.000Z","date":"2021-06-01","kind":"sale","acquired":false,"shares":4104,"price":9.41,"value":38618.64,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"shares","element":"transactionShares","label":"F2","text":"Sale of shares to cover personal income tax obligation upon settlement of restricted stock unit award"},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $9.31 to $9.55, inclusive. 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Shares in respect of the vested portion of the award must be delivered no later than March 15 of the calendar year following the year in which vesting occurs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Of the shares of common stock reported, 101,713 shares represent unvested restricted stock units."}],"balance_after":298563,"source":{"system":"sec-edgar","filing":"0001628280-20-012842","document":"wf-form4_159779593780714.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828020012842/wf-form4_159779593780714.xml","form_type":"4"}},{"id":3053601,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-08-19T00:12:33.000Z","date":"2020-08-14","kind":"grant","acquired":true,"shares":44826,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units issued to the Reporting Person.  Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer and has no expiration date.  One third of the shares underlying the restricted stock unit award vested on August 14, 2020.  One third of the shares will vest on August 14, 2021, and one third of the shares will vest on August 14, 2022, subject to the Reporting Person providing continuous service to the Issuer on such dates.  Shares in respect of the vested portion of the award must be delivered no later than March 15 of the calendar year following the year in which vesting occurs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Of the shares of common stock reported, 71,830 shares represent unvested restricted stock units."}],"balance_after":253738,"source":{"system":"sec-edgar","filing":"0001628280-20-012842","document":"wf-form4_159779593780714.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828020012842/wf-form4_159779593780714.xml","form_type":"4"}},{"id":3069147,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-08-04T20:33:16.000Z","date":"2020-08-03","kind":"sale","acquired":false,"shares":2400,"price":7.45,"value":17880.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. 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These shares were sold in multiple transactions ranging from $8.87 to $8.99, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Of the shares of common stock reported, 55,928 shares represent unvested restricted stock units."}],"balance_after":230094,"source":{"system":"sec-edgar","filing":"0001628280-20-006483","document":"wf-form4_158871392097182.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828020006483/wf-form4_158871392097182.xml","form_type":"4"}},{"id":3182514,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-04-03T19:59:22.000Z","date":"2020-04-02","kind":"sale","acquired":false,"shares":2400,"price":8.4,"value":20160.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.02 to $8.75, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Of the shares of common stock reported, 55,928 shares represent unvested restricted stock units."}],"balance_after":232494,"source":{"system":"sec-edgar","filing":"0001628280-20-004587","document":"wf-form4_158594394310542.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828020004587/wf-form4_158594394310542.xml","form_type":"4"}},{"id":3231118,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2020-03-03T21:59:18.000Z","date":"2020-03-02","kind":"sale","acquired":false,"shares":2400,"price":10.64,"value":25536.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $10.555 to $10.76, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Of the shares of common stock reported, 55,928 shares represent unvested restricted stock units."}],"balance_after":234894,"source":{"system":"sec-edgar","filing":"0001628280-20-002798","document":"wf-form4_158327274059484.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000162828020002798/wf-form4_158327274059484.xml","form_type":"4"}},{"id":3483790,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Stock Option (right to buy)","published_at":"2019-06-19T20:15:22.000Z","date":"2019-06-17","kind":"grant","acquired":true,"shares":83893,"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 shall vest on June 17, 2020, with the remainder vesting in equal installments of 2.0833% of the shares subject to the option on the last day of each successive month thereafter for a period of 36 months, subject to the Reporting Person continuing to provide services through each such date."}],"balance_after":83893,"derivative":{"exercise_price":14.75,"expiration_date":"2029-06-17","underlying":"Common Stock","underlying_shares":83893},"source":{"system":"sec-edgar","filing":"0000899243-19-017419","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000089924319017419/doc4.xml","form_type":"4"}},{"id":3483789,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2019-06-19T20:15:22.000Z","date":"2019-06-17","kind":"grant","acquired":true,"shares":55928,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Grant of restricted stock units to the Reporting Person under the Issuer's 2017 Equity Incentive Plan, with each restricted stock unit representing the contingent right to receive one share of common stock on the applicable vesting date. No amount was paid upon grant of the units. The restricted stock units vest in four equal annual installments on May 31, 2020, May 31, 2021, May 31, 2022 and May 31, 2023, subject to the Reporting Person continuing to provide services through each such date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Of the shares of common stock reported, 55,928 shares represent unvested restricted stock units."}],"balance_after":237294,"source":{"system":"sec-edgar","filing":"0000899243-19-017419","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000089924319017419/doc4.xml","form_type":"4"}},{"id":3594892,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan 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common stock for $0.65 per share that was assumed by the Issuer in the Merger."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Fully vested."}],"balance_after":100729,"derivative":{"exercise_price":6.84,"expiration_date":"2026-01-18","underlying":"Common Stock","underlying_shares":100729},"source":{"system":"sec-edgar","filing":"0000899243-19-007818","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000089924319007818/doc4.xml","form_type":"4"}},{"id":3594889,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":78029,"kind":"person","name":"Ragan Paula","position":1,"cik":"0001769914","reported_name":"Ragan Paula","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common 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(formerly X4 Pharmaceuticals, Inc.) (\"X4\") and 38,451 shares of Series Seed preferred stock of X4 in connection with the merger of Artemis AC Corp., a wholly-owned subsidiary of the Issuer, with and into X4 (the \"Merger\") on March 13, 2019."}],"balance_after":181366,"source":{"system":"sec-edgar","filing":"0000899243-19-007818","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1501697/000089924319007818/doc4.xml","form_type":"4"}}]}