Company · CIK 1501697 # X4 Pharmaceuticals, Inc | CIK | [1501697](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001501697) (SEC EDGAR) | | --- | --- | | Industry (SIC) | 2836 — Biological Products, (No Diagnostic Substances) | | Incorporated in | DE | | Business address | MA | | Listed | XFOR (Nasdaq) | | First annual or quarterly report | 2018-03-09 | ## Offerings 13 registrations | Registration | Label and status | First filed | Last event | Filings | | --- | --- | --- | --- | --- | | 333-295597 | Shelf Effective | 2026-05-06 | 2026-05-14 | 2 | | 333-273961 | Shelf Effective | 2023-08-14 | 2025-10-24 | 5 | | 333-290158 | Shelf Effective | 2025-09-10 | 2025-09-17 | 2 | | 333-272551 | Shelf Effective | 2023-06-09 | 2023-06-20 | 2 | | 333-249544 | Shelf Effective | 2020-10-19 | 2022-12-09 | 4 | | 333-266410 | Shelf Effective | 2022-07-29 | 2022-08-05 | 2 | | 333-264459 | Shelf Effective | 2022-04-22 | 2022-05-13 | 2 | | 333-242372 | Shelf Effective | 2020-08-07 | 2022-03-22 | 5 | | 333-261871 | Shelf Effective | 2021-12-23 | 2022-01-03 | 2 | | 333-257422 | Shelf Effective | 2021-06-25 | 2021-07-09 | 2 | | 333-233161 | Shelf Effective | 2019-08-09 | 2019-11-27 | 4 | | 333-229377 | Shelf Effective | 2019-01-25 | 2019-04-15 | 4 | | 333-221050 | IPO Final prospectus | 2017-10-20 | 2017-11-17 | 5 | ## Filings 43 | Filed | Filing | Registration | Accession | | --- | --- | --- | --- | | 2026-05-14 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1501697/999999999526001669/9999999995-26-001669-index.htm) Declared effective | 333-295597 | 9999999995-26-001669 | | 2026-05-06 | [S-3](https://www.sec.gov/Archives/edgar/data/1501697/000150169726000043/0001501697-26-000043-index.htm) Shelf registered | 333-295597 | 0001501697-26-000043 | | 2025-10-24 | [424B5](https://www.sec.gov/Archives/edgar/data/1501697/000150169725000031/0001501697-25-000031-index.htm) Shelf takedown | 333-273961 | 0001501697-25-000031 | | 2025-10-23 | [424B5](https://www.sec.gov/Archives/edgar/data/1501697/000150169725000027/0001501697-25-000027-index.htm) Shelf takedown | 333-273961 | 0001501697-25-000027 | | 2025-09-17 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1501697/999999999525002994/9999999995-25-002994-index.htm) Declared effective | 333-290158 | 9999999995-25-002994 | | 2025-09-10 | [S-3](https://www.sec.gov/Archives/edgar/data/1501697/000150169725000017/0001501697-25-000017-index.htm) Shelf registered | 333-290158 | 0001501697-25-000017 | | 2025-06-23 | [424B5](https://www.sec.gov/Archives/edgar/data/1501697/000162828025032526/0001628280-25-032526-index.htm) Shelf takedown | 333-273961 | 0001628280-25-032526 | | 2023-08-24 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1501697/999999999523002489/9999999995-23-002489-index.htm) Declared effective | 333-273961 | 9999999995-23-002489 | | 2023-08-14 | [S-3](https://www.sec.gov/Archives/edgar/data/1501697/000162828023029155/0001628280-23-029155-index.htm) Shelf registered | 333-273961 | 0001628280-23-029155 | | 2023-06-20 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1501697/999999999523001801/9999999995-23-001801-index.htm) Declared effective | 333-272551 | 9999999995-23-001801 | | 2023-06-09 | [S-3](https://www.sec.gov/Archives/edgar/data/1501697/000162828023021708/0001628280-23-021708-index.htm) Shelf registered | 333-272551 | 0001628280-23-021708 | | 2022-12-09 | [424B5](https://www.sec.gov/Archives/edgar/data/1501697/000119312522301149/0001193125-22-301149-index.htm) Shelf takedown | 333-249544 | 0001193125-22-301149 | | 2022-12-07 | [424B5](https://www.sec.gov/Archives/edgar/data/1501697/000119312522299607/0001193125-22-299607-index.htm) Shelf takedown | 333-249544 | 0001193125-22-299607 | | 2022-08-05 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1501697/999999999522002280/9999999995-22-002280-index.htm) Declared effective | 333-266410 | 9999999995-22-002280 | | 2022-07-29 | [S-3](https://www.sec.gov/Archives/edgar/data/1501697/000119312522206657/0001193125-22-206657-index.htm) Shelf registered | 333-266410 | 0001193125-22-206657 | | 2022-05-13 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1501697/999999999522001472/9999999995-22-001472-index.htm) Declared effective | 333-264459 | 9999999995-22-001472 | | 2022-04-22 | [S-3](https://www.sec.gov/Archives/edgar/data/1501697/000162828022010034/0001628280-22-010034-index.htm) Shelf registered | 333-264459 | 0001628280-22-010034 | | 2022-03-22 | [424B5](https://www.sec.gov/Archives/edgar/data/1501697/000162828022006888/0001628280-22-006888-index.htm) Shelf takedown | 333-242372 | 0001628280-22-006888 | | 2022-01-14 | [424B5](https://www.sec.gov/Archives/edgar/data/1501697/000119312522009908/0001193125-22-009908-index.htm) Shelf takedown | 333-242372 | 0001193125-22-009908 | | 2022-01-03 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1501697/999999999522000039/9999999995-22-000039-index.htm) Declared effective | 333-261871 | 9999999995-22-000039 | | 2021-12-23 | [S-3](https://www.sec.gov/Archives/edgar/data/1501697/000119312521366265/0001193125-21-366265-index.htm) Shelf registered | 333-261871 | 0001193125-21-366265 | | 2021-07-09 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1501697/999999999521002704/9999999995-21-002704-index.htm) Declared effective | 333-257422 | 9999999995-21-002704 | | 2021-06-25 | [S-3](https://www.sec.gov/Archives/edgar/data/1501697/000119312521200438/0001193125-21-200438-index.htm) Shelf registered | 333-257422 | 0001193125-21-200438 | | 2020-10-26 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1501697/999999999520002979/9999999995-20-002979-index.htm) Declared effective | 333-249544 | 9999999995-20-002979 | | 2020-10-19 | [S-3](https://www.sec.gov/Archives/edgar/data/1501697/000119312520272057/0001193125-20-272057-index.htm) Shelf registered | 333-249544 | 0001193125-20-272057 | | 2020-10-16 | [424B5](https://www.sec.gov/Archives/edgar/data/1501697/000119312520271098/0001193125-20-271098-index.htm) Shelf takedown | 333-242372 | 0001193125-20-271098 | | 2020-08-19 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1501697/999999999520002202/9999999995-20-002202-index.htm) Declared effective | 333-242372 | 9999999995-20-002202 | | 2020-08-07 | [S-3](https://www.sec.gov/Archives/edgar/data/1501697/000119312520213051/0001193125-20-213051-index.htm) Shelf registered | 333-242372 | 0001193125-20-213051 | | 2019-11-27 | [424B5](https://www.sec.gov/Archives/edgar/data/1501697/000119312519302710/0001193125-19-302710-index.htm) Shelf takedown | 333-233161 | 0001193125-19-302710 | | 2019-11-25 | [424B5](https://www.sec.gov/Archives/edgar/data/1501697/000119312519299872/0001193125-19-299872-index.htm) Shelf takedown | 333-233161 | 0001193125-19-299872 | | 2019-08-29 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1501697/999999999519002010/9999999995-19-002010-index.htm) Declared effective | 333-233161 | 9999999995-19-002010 | | 2019-08-09 | [S-3](https://www.sec.gov/Archives/edgar/data/1501697/000119312519217393/0001193125-19-217393-index.htm) Shelf registered | 333-233161 | 0001193125-19-217393 | | 2019-04-15 | [424B5](https://www.sec.gov/Archives/edgar/data/1501697/000119312519106612/0001193125-19-106612-index.htm) Shelf takedown | 333-229377 | 0001193125-19-106612 | | 2019-04-12 | [424B5](https://www.sec.gov/Archives/edgar/data/1501697/000119312519104409/0001193125-19-104409-index.htm) Shelf takedown | 333-229377 | 0001193125-19-104409 | | 2019-02-19 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1501697/999999999519000298/9999999995-19-000298-index.htm) Declared effective | 333-229377 | 9999999995-19-000298 | | 2019-02-14 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1501697/999999999519000261/9999999995-19-000261-index.htm) Declared effective | 333-228929 | 9999999995-19-000261 | | 2019-01-25 | [S-3](https://www.sec.gov/Archives/edgar/data/1501697/000119312519017208/0001193125-19-017208-index.htm) Shelf registered | 333-229377 | 0001193125-19-017208 | | 2017-11-17 | [424B1](https://www.sec.gov/Archives/edgar/data/1501697/000119312517345863/0001193125-17-345863-index.htm) Final prospectus | 333-221050 | 0001193125-17-345863 | | 2017-11-15 | [EFFECT](https://www.sec.gov/Archives/edgar/data/1501697/999999999517002979/9999999995-17-002979-index.htm) Declared effective | 333-221050 | 9999999995-17-002979 | | 2017-11-15 | [S-1/A](https://www.sec.gov/Archives/edgar/data/1501697/000119312517343803/0001193125-17-343803-index.htm) Amendment | 333-221050 | 0001193125-17-343803 | | 2017-11-06 | [S-1/A](https://www.sec.gov/Archives/edgar/data/1501697/000119312517333514/0001193125-17-333514-index.htm) Amendment | 333-221050 | 0001193125-17-333514 | | 2017-10-20 | [S-1](https://www.sec.gov/Archives/edgar/data/1501697/000119312517315505/0001193125-17-315505-index.htm) Registration filed | 333-221050 | 0001193125-17-315505 | | 2017-08-10 | [DRS](https://www.sec.gov/Archives/edgar/data/1501697/000095012317007162/0000950123-17-007162-index.htm) Draft made public | 377-01662 | 0000950123-17-007162 | [All filings of this company](https://equitycapital.markets/filings?cik=1501697) · [CSV](https://equitycapital.markets/filings.csv?cik=1501697) --- Source page: https://equitycapital.markets/company/1501697 · Data: U.S. SEC EDGAR · CC BY 4.0