X4 Pharmaceuticals, Inc SEC filings XFOR
X4 Pharmaceuticals, Inc has 818 filings in SEC EDGAR's recent list, going back to Sep 24, 2010. Its latest annual report, Form ARS, was filed on Mar 20, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 4, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Oct 29, 2026 (other events). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 8-K |
Current report
Other events
|
Oct 29, 2026 | Oct 29, 2026 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt, Unregistered share sale, Regulation FD disclosure
|
Oct 8, 2026 | Oct 7, 2026 |
| 8-K |
Current report
Other events
|
Sep 9, 2026 | Sep 8, 2026 |
| 8-K |
Current report
Other events
|
Sep 8, 2026 | Sep 8, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Jul 1, 2026 | Jun 30, 2026 |
| 8-K/A |
Amended current report
Officer or director change, Shareholder vote results
|
May 13, 2026 | May 11, 2026 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 12, 2026 | May 11, 2026 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2025 | Nov 5, 2025 |
| 8-K |
Current report
Material agreement
|
Oct 27, 2025 | Oct 23, 2025 |
| 8-K |
Current report
Exit or restructuring costs, Officer or director change, Regulation FD disclosure
|
Sep 17, 2025 | Sep 15, 2025 |
| 8-K |
Current report
Officer or director change
|
Aug 25, 2025 | Aug 22, 2025 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Other events
|
Aug 13, 2025 | Aug 12, 2025 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Officer or director change, Other events
|
Aug 12, 2025 | Aug 11, 2025 |
| 8-K |
Current report
Material agreement
|
Jun 23, 2025 | Jun 23, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Jun 11, 2025 | Jun 11, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 1, 2025 | May 1, 2025 |
| 8-K |
Current report
Bylaw or fiscal year change, Other events
|
Apr 24, 2025 | Apr 24, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Apr 18, 2025 | Apr 17, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 25, 2025 | Mar 25, 2025 |
| 8-K |
Current report
Other events
|
Mar 3, 2025 | Mar 3, 2025 |
| 8-K |
Current report
Exit or restructuring costs, Regulation FD disclosure
|
Feb 6, 2025 | Feb 6, 2025 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Jan 13, 2025 | Jan 13, 2025 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Nov 13, 2024 | Nov 13, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 13, 2024 | Nov 13, 2024 |
| 8-K |
Current report
Listing notice
|
Aug 16, 2024 | Aug 13, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 9, 2024 | Aug 8, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2024 | Aug 8, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 19, 2024 | Jul 19, 2024 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 27, 2024 | Jun 27, 2024 |
| 8-K |
Current report
Shareholder vote results
|
Jun 11, 2024 | Jun 10, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
May 22, 2024 | May 22, 2024 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Officer or director change, Regulation FD disclosure, Other events
|
May 9, 2024 | May 8, 2024 |
| 8-K |
Current report
Results of operations
|
May 7, 2024 | May 7, 2024 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Apr 29, 2024 | Apr 29, 2024 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Apr 29, 2024 | Apr 29, 2024 |
| 8-K |
Current report
Other events
|
Apr 5, 2024 | Apr 5, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 1, 2024 | Apr 1, 2024 |
| 8-K |
Current report
Results of operations
|
Mar 21, 2024 | Mar 21, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 8, 2024 | Jan 8, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 27, 2023 | Nov 27, 2023 |
| 8-K |
Current report
Listing notice
|
Nov 14, 2023 | Nov 13, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 9, 2023 | Nov 9, 2023 |
| 8-K |
Current report
Other events
|
Oct 31, 2023 | Oct 31, 2023 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Oct 18, 2023 | Oct 16, 2023 |
| 8-K |
Current report
Other events
|
Sep 5, 2023 | Sep 5, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 10, 2023 | Aug 10, 2023 |
| 8-K |
Current report
Material agreement, New debt, Regulation FD disclosure
|
Aug 3, 2023 | Aug 2, 2023 |
| 8-K |
Current report
Shareholder vote results
|
Jun 15, 2023 | Jun 13, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 1, 2023 | Jun 1, 2023 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Regulation FD disclosure, Other events
|
May 16, 2023 | May 15, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
May 4, 2023 | May 4, 2023 |
| 8-K |
Current report
Results of operations
|
May 4, 2023 | May 4, 2023 |
| 8-K |
Current report
Acquisition or sale of assets
|
May 4, 2023 | May 4, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 21, 2023 | Mar 21, 2023 |
| 8-K |
Current report
Results of operations
|
Mar 21, 2023 | Mar 21, 2023 |
| 8-K |
Current report
Other events
|
Mar 10, 2023 | Mar 10, 2023 |
| 8-K |
Current report
Material agreement, New debt
|
Jan 6, 2023 | Jan 6, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 5, 2023 | Jan 5, 2023 |
| 8-K |
Current report
Officer or director change
|
Dec 23, 2022 | Dec 20, 2022 |
| 8-K |
Current report
Material agreement, Other events
|
Dec 9, 2022 | Dec 6, 2022 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Nov 29, 2022 | Nov 29, 2022 |
| 8-K |
Current report
Officer or director change
|
Nov 9, 2022 | Nov 7, 2022 |
| 8-K |
Current report
Results of operations, Other events
|
Nov 3, 2022 | Nov 3, 2022 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Oct 4, 2022 | Oct 4, 2022 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Sep 27, 2022 | Sep 27, 2022 |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change, Shareholder vote results
|
Sep 1, 2022 | Sep 1, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 5, 2022 | Aug 5, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2022 | Aug 4, 2022 |
| 8-K |
Current report
Officer or director change
|
Jul 29, 2022 | Jul 25, 2022 |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale, Other events
|
Jul 1, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Shareholder vote results
|
Jun 7, 2022 | Jun 6, 2022 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
May 20, 2022 | May 20, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 12, 2022 | May 12, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Mar 17, 2022 | Mar 17, 2022 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Other events
|
Mar 3, 2022 | Mar 3, 2022 |
| 8-K |
Current report
Material agreement, New debt
|
Feb 9, 2022 | Feb 9, 2022 |
| 8-K/A |
Amended current report
Results of operations, Regulation FD disclosure, Other events
|
Jan 26, 2022 | Jan 25, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jan 25, 2022 | Jan 25, 2022 |
| 8-K |
Current report
Material agreement
|
Jan 14, 2022 | Jan 14, 2022 |
| 8-K |
Current report
Agreement ended
|
Jan 14, 2022 | Jan 13, 2022 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Dec 13, 2021 | Dec 13, 2021 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Nov 15, 2021 | Nov 15, 2021 |
| 8-K |
Current report
Officer or director change
|
Nov 12, 2021 | Nov 11, 2021 |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Nov 5, 2021 | Nov 5, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2021 | Nov 4, 2021 |
| 8-K |
Current report
Officer or director change
|
Oct 19, 2021 | Oct 14, 2021 |
| 8-K |
Current report
Officer or director change
|
Sep 10, 2021 | Sep 10, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 6, 2021 | Aug 6, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2021 | Aug 3, 2021 |
| 8-K |
Current report
Other events
|
Jul 23, 2021 | Jul 20, 2021 |
| 8-K |
Current report
Other events
|
Jul 15, 2021 | Jul 15, 2021 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 28, 2021 | Jun 28, 2021 |
| 8-K |
Current report
Other events
|
Jun 11, 2021 | Jun 11, 2021 |
| 8-K |
Current report
Shareholder vote results, Other events
|
Jun 7, 2021 | Jun 7, 2021 |
| 8-K |
Current report
Results of operations
|
May 6, 2021 | May 6, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 9, 2021 | Apr 9, 2021 |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale, Other events
|
Mar 19, 2021 | Mar 18, 2021 |
| 8-K |
Current report
Results of operations
|
Mar 4, 2021 | Mar 4, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 8, 2021 | Jan 8, 2021 |
| 8-K |
Current report
Material agreement, New debt
|
Dec 23, 2020 | Dec 21, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2020 | Nov 5, 2020 |
| 8-K |
Current report
Material agreement
|
Oct 16, 2020 | Oct 14, 2020 |
| 8-K |
Current report
Other events
|
Oct 7, 2020 | Oct 7, 2020 |
| 8-K |
Current report
Officer or director change
|
Oct 1, 2020 | Sep 25, 2020 |
| 8-K |
Current report
Other events
|
Sep 11, 2020 | Sep 11, 2020 |
| 8-K |
Current report
Results of operations
|
Jul 30, 2020 | Jul 29, 2020 |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change, Shareholder vote results
|
Jun 11, 2020 | Jun 10, 2020 |
| 8-K |
Current report
Results of operations
|
May 7, 2020 | May 6, 2020 |
| 8-K |
Current report
Officer or director change
|
Mar 20, 2020 | Mar 18, 2020 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 17, 2020 | Mar 13, 2020 |
| 8-K |
Current report
Results of operations
|
Mar 12, 2020 | Mar 6, 2020 |
| 8-K |
Current report
Officer or director change
|
Feb 13, 2020 | Feb 10, 2020 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jan 10, 2020 | Jan 9, 2020 |
| 8-K |
Current report
Material agreement, Other events
|
Nov 27, 2019 | Nov 25, 2019 |
| 8-K |
Current report
Material agreement, New debt
|
Nov 14, 2019 | Nov 14, 2019 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2019 | Nov 7, 2019 |
| 8-K/A |
Amended current report
Officer or director change
|
Oct 18, 2019 | Sep 18, 2019 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 4, 2019 | Oct 3, 2019 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Sep 30, 2019 | Sep 30, 2019 |
| 8-K |
Current report
Officer or director change
|
Sep 20, 2019 | Sep 18, 2019 |
| 8-K |
Current report
Other events
|
Aug 9, 2019 | Aug 9, 2019 |
| 8-K |
Current report
Material agreement, New debt
|
Jun 28, 2019 | Jun 27, 2019 |
| 8-K |
Current report
Other events
|
Jun 26, 2019 | Jun 26, 2019 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 19, 2019 | Jun 17, 2019 |
| 8-K/A |
Amended current report
Officer or director change
|
May 17, 2019 | Mar 29, 2019 |
| 8-K/A | Amended current report | May 13, 2019 | Mar 11, 2019 |
| 8-K |
Current report
Material agreement, Other events
|
Apr 15, 2019 | Apr 12, 2019 |
| 8-K |
Current report
Results of operations, Other events
|
Apr 12, 2019 | Apr 11, 2019 |
| 8-K |
Current report
Other events
|
Apr 11, 2019 | Apr 11, 2019 |
| 8-K/A | Amended current report | Apr 3, 2019 | Mar 11, 2019 |
| 8-K |
Current report
Officer or director change
|
Apr 2, 2019 | Mar 29, 2019 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Apr 1, 2019 | Apr 1, 2019 |
| 8-K |
Current report
Acquisition or sale of assets, New debt, Change to shareholder rights, Change in control, Officer or director change, Bylaw or fiscal year change, Shareholder vote results, Other events
|
Mar 13, 2019 | Mar 11, 2019 |
| 8-K |
Current report
Material agreement
|
Mar 8, 2019 | Mar 8, 2019 |
| 8-K |
Current report
Agreement ended, Other events
|
Mar 1, 2019 | Feb 25, 2019 |
| 8-K | Current report | Feb 8, 2019 | Feb 4, 2019 |
| 8-K |
Current report
Officer or director change
|
Jan 16, 2019 | Jan 11, 2019 |
| 8-K |
Current report
Material agreement, Other events
|
Dec 20, 2018 | Dec 12, 2018 |
| 8-K |
Current report
Other events
|
Nov 27, 2018 | Nov 27, 2018 |
| 8-K |
Current report
Material agreement, Change in control, Officer or director change, Regulation FD disclosure, Other events
|
Nov 27, 2018 | Nov 26, 2018 |
| 8-K |
Current report
Results of operations
|
Nov 9, 2018 | Nov 9, 2018 |
| 8-K |
Current report
Results of operations
|
Aug 13, 2018 | Aug 13, 2018 |
| 8-K |
Current report
Other events
|
Jun 28, 2018 | Jun 28, 2018 |
| 8-K |
Current report
Material agreement
|
Jun 12, 2018 | Jun 6, 2018 |
| 8-K |
Current report
Shareholder vote results
|
Jun 7, 2018 | Jun 5, 2018 |
| 8-K |
Current report
Results of operations
|
May 10, 2018 | May 10, 2018 |
| 8-K |
Current report
Results of operations
|
Mar 9, 2018 | Mar 9, 2018 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Nov 20, 2017 | Nov 20, 2017 |
Showing 148 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
Company profile
- Industry
- Biological Products, (No Diagnostic Substances) (SIC 2836)
- Listed as
- XFOR (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Boston, MA
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1501697
- Former names
- Arsanis, Inc. (until Mar 13, 2019)
Other Biological Products, (No Diagnostic Substances) companies
- Amgen Inc AMGN
- Gilead Sciences, Inc. GILD
- Moderna, Inc. MRNA
- Argenx SE ARGX
- Revolution Medicines, Inc. RVMD
- Biogen Inc. BIIB
- BioNTech SE BNTX
- Exelixis, Inc. EXEL
All 182 Biological Products, (No Diagnostic Substances) companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.