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
ARS Annual report to shareholders Mar 20, 2026 Dec 31, 2025
10-K Annual report Mar 17, 2026 Dec 31, 2025
10-K Annual report Mar 26, 2025 Dec 31, 2024
ARS Annual report to shareholders Apr 29, 2024 Dec 31, 2023
10-K Annual report Mar 21, 2024 Dec 31, 2023
ARS Annual report to shareholders Apr 25, 2023 Dec 31, 2022
10-K Annual report Mar 21, 2023 Dec 31, 2022
10-K Annual report Mar 17, 2022 Dec 31, 2021
10-K Annual report Mar 19, 2021 Dec 31, 2020
10-K Annual report Mar 12, 2020 Dec 31, 2019
10-K Annual report Mar 11, 2019 Dec 31, 2018
10-K Annual report Mar 9, 2018 Dec 31, 2017

Showing 12 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.

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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)

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Source: SEC EDGAR filings. This is company-reported data, not investment advice.