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V, LLC (\"PVM V\") is the general partner of PVP V, Polaris Venture Partners Founders' Fund V, L.P. (\"PVPFF V\"), Polaris Venture Partners Special Founders' Fund V, L.P. (\"PVPSFF V\") and Polaris Venture Partners Entrepreneurs' Fund V, L.P. (\"PVPEF V\"). Each of Jonathan A. Flint and Terrance G. McGuire are the managing members of PVM V. PVM V disclaims beneficial ownership of these securities and this report shall not be deemed an admission that PVM V is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of its pecuniary interest therein. Each of Jonathan A. Flint and Terrance G. McGuire, in their respective capacities with regard to PVM V, may be deemed to have shared voting and dispositive power over the shares held by each of PVP V, PVPFF V, PFPSFF V and PVPEF V."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Each of Messrs. 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V, LLC (\"PVM V\") is the general partner of PVP V, Polaris Venture Partners Founders' Fund V, L.P. (\"PVPFF V\"), Polaris Venture Partners Special Founders' Fund V, L.P. (\"PVPSFF V\") and Polaris Venture Partners Entrepreneurs' Fund V, L.P. (\"PVPEF V\"). Each of Jonathan A. Flint and Terrance G. McGuire are the managing members of PVM V. PVM V disclaims beneficial ownership of these securities and this report shall not be deemed an admission that PVM V is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of its pecuniary interest therein. Each of Jonathan A. Flint and Terrance G. McGuire, in their respective capacities with regard to PVM V, may be deemed to have shared voting and dispositive power over the shares held by each of PVP V, PVPFF V, PFPSFF V and PVPEF V."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Each of Messrs. Flint and McGuire disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F14","text":"Securities held of record by PVPFF V."}],"balance_after":5275,"derivative":{"exercise_price":0.75,"exercise_date":"2018-04-03","expiration_date":"2023-04-03","underlying":"Common Stock","underlying_shares":5275},"source":{"system":"sec-edgar","filing":"0000899243-18-009612","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":16,"url":"https://www.sec.gov/Archives/edgar/data/1117003/000089924318009612/doc4.xml","form_type":"4"}},{"id":3968587,"issuer":{"id":8249,"kind":"organization","name":"Pulmatrix, Inc."},"owners":[{"id":27833,"kind":"person","name":"MCGUIRE TERRANCE","position":1,"cik":"0001117003","reported_name":"MCGUIRE TERRANCE","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128641,"kind":"person","name":"Flint Jonathan A","position":2,"cik":"0001295676","reported_name":"Flint Jonathan A","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":107448,"kind":"organization","name":"Polaris Venture Management Co IV LLC","position":3,"cik":"0001295438","reported_name":"Polaris Venture Management Co IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149437,"kind":"organization","name":"POLARIS VENTURE PARTNERS ENTREPRENEURS FUND IV LP","position":4,"cik":"0001170720","reported_name":"POLARIS VENTURE PARTNERS ENTREPRENEURS FUND IV LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149438,"kind":"organization","name":"POLARIS VENTURE PARTNERS IV LP","position":5,"cik":"0001157864","reported_name":"POLARIS VENTURE PARTNERS IV LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. 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V, LLC (\"PVM V\") is the general partner of PVP V, Polaris Venture Partners Founders' Fund V, L.P. (\"PVPFF V\"), Polaris Venture Partners Special Founders' Fund V, L.P. (\"PVPSFF V\") and Polaris Venture Partners Entrepreneurs' Fund V, L.P. (\"PVPEF V\"). Each of Jonathan A. Flint and Terrance G. McGuire are the managing members of PVM V. PVM V disclaims beneficial ownership of these securities and this report shall not be deemed an admission that PVM V is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of its pecuniary interest therein. Each of Jonathan A. Flint and Terrance G. McGuire, in their respective capacities with regard to PVM V, may be deemed to have shared voting and dispositive power over the shares held by each of PVP V, PVPFF V, PFPSFF V and PVPEF V."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Each of Messrs. Flint and McGuire disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F14","text":"Securities held of record by PVPFF V."}],"balance_after":5275,"derivative":{"exercise_price":0.65,"exercise_date":"2018-04-03","expiration_date":"2018-10-03","underlying":"Common Stock","underlying_shares":5275},"source":{"system":"sec-edgar","filing":"0000899243-18-009612","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":15,"url":"https://www.sec.gov/Archives/edgar/data/1117003/000089924318009612/doc4.xml","form_type":"4"}},{"id":3968586,"issuer":{"id":8249,"kind":"organization","name":"Pulmatrix, Inc."},"owners":[{"id":27833,"kind":"person","name":"MCGUIRE TERRANCE","position":1,"cik":"0001117003","reported_name":"MCGUIRE TERRANCE","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128641,"kind":"person","name":"Flint Jonathan A","position":2,"cik":"0001295676","reported_name":"Flint Jonathan A","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":107448,"kind":"organization","name":"Polaris Venture Management Co IV LLC","position":3,"cik":"0001295438","reported_name":"Polaris Venture Management Co IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149437,"kind":"organization","name":"POLARIS VENTURE PARTNERS ENTREPRENEURS FUND IV LP","position":4,"cik":"0001170720","reported_name":"POLARIS VENTURE PARTNERS ENTREPRENEURS FUND IV LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149438,"kind":"organization","name":"POLARIS VENTURE PARTNERS IV LP","position":5,"cik":"0001157864","reported_name":"POLARIS VENTURE PARTNERS IV LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. 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V, LLC (\"PVM V\") is the general partner of PVP V, Polaris Venture Partners Founders' Fund V, L.P. (\"PVPFF V\"), Polaris Venture Partners Special Founders' Fund V, L.P. (\"PVPSFF V\") and Polaris Venture Partners Entrepreneurs' Fund V, L.P. (\"PVPEF V\"). Each of Jonathan A. Flint and Terrance G. McGuire are the managing members of PVM V. PVM V disclaims beneficial ownership of these securities and this report shall not be deemed an admission that PVM V is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of its pecuniary interest therein. Each of Jonathan A. Flint and Terrance G. McGuire, in their respective capacities with regard to PVM V, may be deemed to have shared voting and dispositive power over the shares held by each of PVP V, PVPFF V, PFPSFF V and PVPEF V."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Each of Messrs. Flint and McGuire disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F12","text":"Securities held of record by PVPEF V."}],"balance_after":67729,"source":{"system":"sec-edgar","filing":"0000899243-18-009612","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1117003/000089924318009612/doc4.xml","form_type":"4"}},{"id":3968575,"issuer":{"id":8249,"kind":"organization","name":"Pulmatrix, Inc."},"owners":[{"id":27833,"kind":"person","name":"MCGUIRE TERRANCE","position":1,"cik":"0001117003","reported_name":"MCGUIRE TERRANCE","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128641,"kind":"person","name":"Flint Jonathan A","position":2,"cik":"0001295676","reported_name":"Flint Jonathan A","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":107448,"kind":"organization","name":"Polaris Venture Management Co IV LLC","position":3,"cik":"0001295438","reported_name":"Polaris Venture Management Co IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149437,"kind":"organization","name":"POLARIS VENTURE PARTNERS ENTREPRENEURS FUND IV LP","position":4,"cik":"0001170720","reported_name":"POLARIS VENTURE PARTNERS ENTREPRENEURS FUND IV LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149438,"kind":"organization","name":"POLARIS VENTURE PARTNERS IV LP","position":5,"cik":"0001157864","reported_name":"POLARIS VENTURE PARTNERS IV LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. 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(\"PVP V\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"Securities held of record by PVP V."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Polaris Venture Management Co. V, LLC (\"PVM V\") is the general partner of PVP V, Polaris Venture Partners Founders' Fund V, L.P. (\"PVPFF V\"), Polaris Venture Partners Special Founders' Fund V, L.P. (\"PVPSFF V\") and Polaris Venture Partners Entrepreneurs' Fund V, L.P. (\"PVPEF V\"). Each of Jonathan A. Flint and Terrance G. McGuire are the managing members of PVM V. PVM V disclaims beneficial ownership of these securities and this report shall not be deemed an admission that PVM V is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of its pecuniary interest therein. Each of Jonathan A. Flint and Terrance G. McGuire, in their respective capacities with regard to PVM V, may be deemed to have shared voting and dispositive power over the shares held by each of PVP V, PVPFF V, PFPSFF V and PVPEF V."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Each of Messrs. Flint and McGuire disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":3468190,"source":{"system":"sec-edgar","filing":"0000899243-18-009612","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1117003/000089924318009612/doc4.xml","form_type":"4"}},{"id":3968574,"issuer":{"id":8249,"kind":"organization","name":"Pulmatrix, Inc."},"owners":[{"id":27833,"kind":"person","name":"MCGUIRE TERRANCE","position":1,"cik":"0001117003","reported_name":"MCGUIRE TERRANCE","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128641,"kind":"person","name":"Flint Jonathan A","position":2,"cik":"0001295676","reported_name":"Flint Jonathan A","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":107448,"kind":"organization","name":"Polaris Venture Management Co IV LLC","position":3,"cik":"0001295438","reported_name":"Polaris Venture Management Co IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149437,"kind":"organization","name":"POLARIS VENTURE PARTNERS ENTREPRENEURS FUND IV LP","position":4,"cik":"0001170720","reported_name":"POLARIS VENTURE PARTNERS ENTREPRENEURS FUND IV LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149438,"kind":"organization","name":"POLARIS VENTURE PARTNERS IV LP","position":5,"cik":"0001157864","reported_name":"POLARIS VENTURE PARTNERS IV LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. 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IV, L.L.C. (\"PVM IV\") is the general partner of PVP IV and Polaris Venture Partners Entrepreneurs' Fund IV, L.P. (\"PVPE IV\"). Each of Jonathan A. Flint and Terrance G. McGuire are the managing members of PVM IV. PVM IV disclaims beneficial ownership of these securities and this report shall not be deemed an admission that PVM IV is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of its pecuniary interest therein. Each of Jonathan A. Flint and Terrance G. McGuire, in their respective capacities with regard to PVM IV, may be deemed to have shared voting and dispositive power over the shares held by each of PVP IV and PVPE IV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each of Messrs. Flint and McGuire disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"Securities held of record by PVPE IV."}],"balance_after":29178,"source":{"system":"sec-edgar","filing":"0000899243-18-009612","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1117003/000089924318009612/doc4.xml","form_type":"4"}},{"id":3968573,"issuer":{"id":8249,"kind":"organization","name":"Pulmatrix, Inc."},"owners":[{"id":27833,"kind":"person","name":"MCGUIRE TERRANCE","position":1,"cik":"0001117003","reported_name":"MCGUIRE TERRANCE","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128641,"kind":"person","name":"Flint Jonathan A","position":2,"cik":"0001295676","reported_name":"Flint Jonathan A","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":107448,"kind":"organization","name":"Polaris Venture Management Co IV LLC","position":3,"cik":"0001295438","reported_name":"Polaris Venture Management Co IV LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149437,"kind":"organization","name":"POLARIS VENTURE PARTNERS ENTREPRENEURS FUND IV LP","position":4,"cik":"0001170720","reported_name":"POLARIS VENTURE PARTNERS ENTREPRENEURS FUND IV LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":149438,"kind":"organization","name":"POLARIS VENTURE PARTNERS IV LP","position":5,"cik":"0001157864","reported_name":"POLARIS VENTURE PARTNERS IV LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. 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(\"PVP IV\") for $0.65 per Unit (each, a \"Unit\").  Each Unit consisted of one share of common stock, one Series A Warrant to purchase one share of common stock at an exercise price of $0.65 per share, and one Series B Warrant to purchase one share of common stock at an exercise price of $0.75 per share."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Securities held of record by PVP IV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Polaris Venture Management Co. IV, L.L.C. (\"PVM IV\") is the general partner of PVP IV and Polaris Venture Partners Entrepreneurs' Fund IV, L.P. (\"PVPE IV\"). Each of Jonathan A. Flint and Terrance G. McGuire are the managing members of PVM IV. PVM IV disclaims beneficial ownership of these securities and this report shall not be deemed an admission that PVM IV is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of its pecuniary interest therein. Each of Jonathan A. Flint and Terrance G. McGuire, in their respective capacities with regard to PVM IV, may be deemed to have shared voting and dispositive power over the shares held by each of PVP IV and PVPE IV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"Each of Messrs. Flint and McGuire disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":1556676,"source":{"system":"sec-edgar","filing":"0000899243-18-009612","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1117003/000089924318009612/doc4.xml","form_type":"4"}},{"id":4156269,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F10","text":"The Series D Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F10","text":"The Series D Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are owned directly by Polaris Special Founders' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and, may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":6310},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":44,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156268,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F10","text":"The Series D Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F10","text":"The Series D Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are owned directly by Polaris Founders' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds.  Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":4322},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":43,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156267,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F10","text":"The Series D Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F10","text":"The Series D Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are owned directly by Polaris Entrepreneurs' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":12298},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":42,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156266,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F10","text":"The Series D Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F10","text":"The Series D Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series D Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are owned directly by Polaris Venture Partners V, L.P. (\"Polaris V\"), whose general partner is Polaris Venture Management Co. V, L.L.C. (\"Polaris Management\"). Each of Jonathan A. Flint (\"Flint\") and Terrance G. McGuire (\"McGuire\"), who is a member of the Issuer's Board of Directors and whose beneficial ownership is reported on a separate Form 4, are  the managing members of Polaris Management and may each be deemed to share voting and dispositive power with respect to the shares held by each of Polaris V, Polaris Venture Partners Entrepreneurs' Fund V, L.P. (\"Polaris Entrepreneurs' V\"), Polaris Venture Partners Founders' Fund V, L.P. (\"Polaris Founders' V\") and Polaris Venture Partners Special Founders' Fund V, L.P. (\"Polaris Special Founders' V\", and together with Polaris V, Polaris Entrepreneurs' V and Polaris Founders' V, the \"Polaris V Funds\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"(Continued from footnote 2) Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":631041},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":41,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156265,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. V, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128633,"kind":"organization","name":"Polaris Venture Partners V, L.P.","position":2,"cik":"0001439590","reported_name":"Polaris Venture Partners V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128634,"kind":"organization","name":"Polaris Venture Partners Entrepreneurs' Fund V, L.P.","position":3,"cik":"0001439587","reported_name":"Polaris Venture Partners Entrepreneurs' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128635,"kind":"organization","name":"Polaris Venture Partners Founders' Fund V, L.P.","position":4,"cik":"0001439588","reported_name":"Polaris Venture Partners Founders' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128636,"kind":"organization","name":"Polaris Venture Partners Special Founders' Fund V, L.P.","position":5,"cik":"0001439586","reported_name":"Polaris Venture Partners Special Founders' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128641,"kind":"person","name":"Flint Jonathan A","position":6,"cik":"0001295676","reported_name":"Flint Jonathan A","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series C Convertible Preferred Stock","published_at":"2017-11-20T17:28:35.000Z","date":"2017-11-20","kind":"exercise","acquired":false,"shares":2213,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F9","text":"The Series C Convertible Preferred Stock converted into Common Stock on a 0.49832-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series C Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F9","text":"The Series C Convertible Preferred Stock converted into Common Stock on a 0.49832-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series C Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F9","text":"The Series C Convertible Preferred Stock converted into Common Stock on a 0.49832-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series C Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are owned directly by Polaris Special Founders' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and, may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":1102},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":40,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156264,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. V, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128633,"kind":"organization","name":"Polaris Venture Partners V, L.P.","position":2,"cik":"0001439590","reported_name":"Polaris Venture Partners V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128634,"kind":"organization","name":"Polaris Venture Partners Entrepreneurs' Fund V, L.P.","position":3,"cik":"0001439587","reported_name":"Polaris Venture Partners Entrepreneurs' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128635,"kind":"organization","name":"Polaris Venture Partners Founders' Fund V, L.P.","position":4,"cik":"0001439588","reported_name":"Polaris Venture Partners Founders' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128636,"kind":"organization","name":"Polaris Venture Partners Special Founders' Fund V, L.P.","position":5,"cik":"0001439586","reported_name":"Polaris Venture Partners Special Founders' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128641,"kind":"person","name":"Flint Jonathan A","position":6,"cik":"0001295676","reported_name":"Flint Jonathan A","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series C Convertible Preferred Stock","published_at":"2017-11-20T17:28:35.000Z","date":"2017-11-20","kind":"exercise","acquired":false,"shares":1516,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F9","text":"The Series C Convertible Preferred Stock converted into Common Stock on a 0.49832-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series C Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F9","text":"The Series C Convertible Preferred Stock converted into Common Stock on a 0.49832-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series C Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F9","text":"The Series C Convertible Preferred Stock converted into Common Stock on a 0.49832-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series C Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are owned directly by Polaris Founders' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds.  Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":755},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":39,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156263,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. V, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128633,"kind":"organization","name":"Polaris Venture Partners V, L.P.","position":2,"cik":"0001439590","reported_name":"Polaris Venture Partners V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128634,"kind":"organization","name":"Polaris Venture Partners Entrepreneurs' Fund V, L.P.","position":3,"cik":"0001439587","reported_name":"Polaris Venture Partners Entrepreneurs' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128635,"kind":"organization","name":"Polaris Venture Partners Founders' Fund V, L.P.","position":4,"cik":"0001439588","reported_name":"Polaris Venture Partners Founders' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128636,"kind":"organization","name":"Polaris Venture Partners Special Founders' Fund V, L.P.","position":5,"cik":"0001439586","reported_name":"Polaris Venture Partners Special Founders' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128641,"kind":"person","name":"Flint Jonathan A","position":6,"cik":"0001295676","reported_name":"Flint Jonathan A","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series C Convertible Preferred Stock","published_at":"2017-11-20T17:28:35.000Z","date":"2017-11-20","kind":"exercise","acquired":false,"shares":4315,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F9","text":"The Series C Convertible Preferred Stock converted into Common Stock on a 0.49832-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series C Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F9","text":"The Series C Convertible Preferred Stock converted into Common Stock on a 0.49832-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series C Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F9","text":"The Series C Convertible Preferred Stock converted into Common Stock on a 0.49832-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series C Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are owned directly by Polaris Entrepreneurs' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":2150},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":38,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156262,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series C Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F9","text":"The Series C Convertible Preferred Stock converted into Common Stock on a 0.49832-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series C Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F9","text":"The Series C Convertible Preferred Stock converted into Common Stock on a 0.49832-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series C Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are owned directly by Polaris Venture Partners V, L.P. (\"Polaris V\"), whose general partner is Polaris Venture Management Co. V, L.L.C. (\"Polaris Management\"). Each of Jonathan A. Flint (\"Flint\") and Terrance G. McGuire (\"McGuire\"), who is a member of the Issuer's Board of Directors and whose beneficial ownership is reported on a separate Form 4, are  the managing members of Polaris Management and may each be deemed to share voting and dispositive power with respect to the shares held by each of Polaris V, Polaris Venture Partners Entrepreneurs' Fund V, L.P. (\"Polaris Entrepreneurs' V\"), Polaris Venture Partners Founders' Fund V, L.P. (\"Polaris Founders' V\") and Polaris Venture Partners Special Founders' Fund V, L.P. (\"Polaris Special Founders' V\", and together with Polaris V, Polaris Entrepreneurs' V and Polaris Founders' V, the \"Polaris V Funds\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"(Continued from footnote 2) Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":110312},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":37,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156261,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series B Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F8","text":"The Series B Convertible Preferred Stock converted into Common Stock on a 0.44650-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series B Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F8","text":"The Series B Convertible Preferred Stock converted into Common Stock on a 0.44650-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series B Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are owned directly by Polaris Special Founders' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and, may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":3173},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":36,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156260,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series B Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F8","text":"The Series B Convertible Preferred Stock converted into Common Stock on a 0.44650-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series B Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F8","text":"The Series B Convertible Preferred Stock converted into Common Stock on a 0.44650-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series B Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are owned directly by Polaris Founders' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds.  Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":2173},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":35,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156259,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series B Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F8","text":"The Series B Convertible Preferred Stock converted into Common Stock on a 0.44650-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series B Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F8","text":"The Series B Convertible Preferred Stock converted into Common Stock on a 0.44650-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series B Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are owned directly by Polaris Entrepreneurs' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":6185},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":34,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156258,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series B Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F8","text":"The Series B Convertible Preferred Stock converted into Common Stock on a 0.44650-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series B Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F8","text":"The Series B Convertible Preferred Stock converted into Common Stock on a 0.44650-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series B Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are owned directly by Polaris Venture Partners V, L.P. (\"Polaris V\"), whose general partner is Polaris Venture Management Co. V, L.L.C. (\"Polaris Management\"). Each of Jonathan A. Flint (\"Flint\") and Terrance G. McGuire (\"McGuire\"), who is a member of the Issuer's Board of Directors and whose beneficial ownership is reported on a separate Form 4, are  the managing members of Polaris Management and may each be deemed to share voting and dispositive power with respect to the shares held by each of Polaris V, Polaris Venture Partners Entrepreneurs' Fund V, L.P. (\"Polaris Entrepreneurs' V\"), Polaris Venture Partners Founders' Fund V, L.P. (\"Polaris Founders' V\") and Polaris Venture Partners Special Founders' Fund V, L.P. (\"Polaris Special Founders' V\", and together with Polaris V, Polaris Entrepreneurs' V and Polaris Founders' V, the \"Polaris V Funds\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"(Continued from footnote 2) Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":317376},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":33,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156257,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series A-2 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"The Series A-2 Convertible Preferred Stock converted into Common Stock on a 0.35785-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-2 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F7","text":"The Series A-2 Convertible Preferred Stock converted into Common Stock on a 0.35785-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-2 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are owned directly by Polaris Special Founders' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and, may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":2433},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":32,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156256,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series A-2 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"The Series A-2 Convertible Preferred Stock converted into Common Stock on a 0.35785-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-2 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F7","text":"The Series A-2 Convertible Preferred Stock converted into Common Stock on a 0.35785-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-2 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are owned directly by Polaris Founders' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds.  Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":1667},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":31,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156255,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series A-2 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"The Series A-2 Convertible Preferred Stock converted into Common Stock on a 0.35785-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-2 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F7","text":"The Series A-2 Convertible Preferred Stock converted into Common Stock on a 0.35785-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-2 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are owned directly by Polaris Entrepreneurs' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":4743},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":30,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156254,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series A-2 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F7","text":"The Series A-2 Convertible Preferred Stock converted into Common Stock on a 0.35785-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-2 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F7","text":"The Series A-2 Convertible Preferred Stock converted into Common Stock on a 0.35785-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-2 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are owned directly by Polaris Venture Partners V, L.P. (\"Polaris V\"), whose general partner is Polaris Venture Management Co. V, L.L.C. (\"Polaris Management\"). Each of Jonathan A. Flint (\"Flint\") and Terrance G. McGuire (\"McGuire\"), who is a member of the Issuer's Board of Directors and whose beneficial ownership is reported on a separate Form 4, are  the managing members of Polaris Management and may each be deemed to share voting and dispositive power with respect to the shares held by each of Polaris V, Polaris Venture Partners Entrepreneurs' Fund V, L.P. (\"Polaris Entrepreneurs' V\"), Polaris Venture Partners Founders' Fund V, L.P. (\"Polaris Founders' V\") and Polaris Venture Partners Special Founders' Fund V, L.P. (\"Polaris Special Founders' V\", and together with Polaris V, Polaris Entrepreneurs' V and Polaris Founders' V, the \"Polaris V Funds\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"(Continued from footnote 2) Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":243385},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":29,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156253,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. V, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128633,"kind":"organization","name":"Polaris Venture Partners V, L.P.","position":2,"cik":"0001439590","reported_name":"Polaris Venture Partners V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128634,"kind":"organization","name":"Polaris Venture Partners Entrepreneurs' Fund V, L.P.","position":3,"cik":"0001439587","reported_name":"Polaris Venture Partners Entrepreneurs' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128635,"kind":"organization","name":"Polaris Venture Partners Founders' Fund V, L.P.","position":4,"cik":"0001439588","reported_name":"Polaris Venture Partners Founders' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128636,"kind":"organization","name":"Polaris Venture Partners Special Founders' Fund V, L.P.","position":5,"cik":"0001439586","reported_name":"Polaris Venture Partners Special Founders' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128641,"kind":"person","name":"Flint Jonathan A","position":6,"cik":"0001295676","reported_name":"Flint Jonathan A","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-1 Convertible Preferred Stock","published_at":"2017-11-20T17:28:35.000Z","date":"2017-11-20","kind":"exercise","acquired":false,"shares":643,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The Series A-1 Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-1 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Series A-1 Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-1 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The Series A-1 Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-1 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are owned directly by Polaris Special Founders' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and, may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":188},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":28,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156252,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. V, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128633,"kind":"organization","name":"Polaris Venture Partners V, L.P.","position":2,"cik":"0001439590","reported_name":"Polaris Venture Partners V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128634,"kind":"organization","name":"Polaris Venture Partners Entrepreneurs' Fund V, L.P.","position":3,"cik":"0001439587","reported_name":"Polaris Venture Partners Entrepreneurs' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128635,"kind":"organization","name":"Polaris Venture Partners Founders' Fund V, L.P.","position":4,"cik":"0001439588","reported_name":"Polaris Venture Partners Founders' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128636,"kind":"organization","name":"Polaris Venture Partners Special Founders' Fund V, L.P.","position":5,"cik":"0001439586","reported_name":"Polaris Venture Partners Special Founders' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128641,"kind":"person","name":"Flint Jonathan A","position":6,"cik":"0001295676","reported_name":"Flint Jonathan A","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-1 Convertible Preferred Stock","published_at":"2017-11-20T17:28:35.000Z","date":"2017-11-20","kind":"exercise","acquired":false,"shares":441,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The Series A-1 Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-1 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Series A-1 Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-1 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The Series A-1 Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-1 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are owned directly by Polaris Founders' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds.  Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":129},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":27,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156251,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series A-1 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Series A-1 Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-1 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The Series A-1 Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-1 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"These shares are owned directly by Polaris Entrepreneurs' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":367},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":26,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156250,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. 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The Series A-1 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Series A-1 Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-1 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The Series A-1 Convertible Preferred Stock converted into Common Stock on a 0.29300-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A-1 Convertible Preferred Stock was convertible at any time at the holder's election and automatically upon the closing at the Issuer's initial public offering. The shares had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are owned directly by Polaris Venture Partners V, L.P. (\"Polaris V\"), whose general partner is Polaris Venture Management Co. V, L.L.C. (\"Polaris Management\"). Each of Jonathan A. Flint (\"Flint\") and Terrance G. McGuire (\"McGuire\"), who is a member of the Issuer's Board of Directors and whose beneficial ownership is reported on a separate Form 4, are  the managing members of Polaris Management and may each be deemed to share voting and dispositive power with respect to the shares held by each of Polaris V, Polaris Venture Partners Entrepreneurs' Fund V, L.P. (\"Polaris Entrepreneurs' V\"), Polaris Venture Partners Founders' Fund V, L.P. (\"Polaris Founders' V\") and Polaris Venture Partners Special Founders' Fund V, L.P. (\"Polaris Special Founders' V\", and together with Polaris V, Polaris Entrepreneurs' V and Polaris Founders' V, the \"Polaris V Funds\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"(Continued from footnote 2) Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":18848},"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":25,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156249,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. V, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128633,"kind":"organization","name":"Polaris Venture Partners V, L.P.","position":2,"cik":"0001439590","reported_name":"Polaris Venture Partners V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128634,"kind":"organization","name":"Polaris Venture Partners Entrepreneurs' Fund V, L.P.","position":3,"cik":"0001439587","reported_name":"Polaris Venture Partners Entrepreneurs' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128635,"kind":"organization","name":"Polaris Venture Partners Founders' Fund V, L.P.","position":4,"cik":"0001439588","reported_name":"Polaris Venture Partners Founders' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128636,"kind":"organization","name":"Polaris Venture Partners Special Founders' Fund V, L.P.","position":5,"cik":"0001439586","reported_name":"Polaris Venture Partners Special Founders' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128641,"kind":"person","name":"Flint Jonathan A","position":6,"cik":"0001295676","reported_name":"Flint Jonathan A","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-11-20T17:28:35.000Z","date":"2017-11-20","kind":"purchase","acquired":true,"shares":4825,"price":10,"value":48250.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"These shares are owned directly by Polaris Special Founders' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and, may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds. Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":18031,"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":24,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}},{"id":4156248,"issuer":{"id":5638,"kind":"organization","name":"X4 Pharmaceuticals, Inc","symbol":"XFOR"},"owners":[{"id":105912,"kind":"organization","name":"Polaris Venture Management Co. V, L.L.C.","position":1,"cik":"0001439589","reported_name":"Polaris Venture Management Co. V, L.L.C.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128633,"kind":"organization","name":"Polaris Venture Partners V, L.P.","position":2,"cik":"0001439590","reported_name":"Polaris Venture Partners V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128634,"kind":"organization","name":"Polaris Venture Partners Entrepreneurs' Fund V, L.P.","position":3,"cik":"0001439587","reported_name":"Polaris Venture Partners Entrepreneurs' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128635,"kind":"organization","name":"Polaris Venture Partners Founders' Fund V, L.P.","position":4,"cik":"0001439588","reported_name":"Polaris Venture Partners Founders' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128636,"kind":"organization","name":"Polaris Venture Partners Special Founders' Fund V, L.P.","position":5,"cik":"0001439586","reported_name":"Polaris Venture Partners Special Founders' Fund V, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":128641,"kind":"person","name":"Flint Jonathan A","position":6,"cik":"0001295676","reported_name":"Flint Jonathan A","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-11-20T17:28:35.000Z","date":"2017-11-20","kind":"purchase","acquired":true,"shares":3305,"price":10,"value":33050.0,"ownership":{"direct":false,"nature":"See Footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"These shares are owned directly by Polaris Founders' V, whose general partner is Polaris Management. Each of Flint and McGuire are the managing members of Polaris Management and may each be deemed to share voting and dispositive power over the shares held by each of the Polaris V Funds. Polaris Management may be deemed to have sole power to vote and dispose of the shares held by the Polaris V Funds.  Each of Flint, McGuire and Polaris Management disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or any other purpose, except to the extent of their respective pecuniary interests therein."}],"balance_after":12351,"source":{"system":"sec-edgar","filing":"0000899243-17-026998","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":23,"url":"https://www.sec.gov/Archives/edgar/data/1439586/000089924317026998/doc4.xml","form_type":"4"}}],"next_cursor":"2017-11-20T17:28:35.000000Z,4156248"}