XFOR 8-K: Q3 2025 results press release furnished as Exhibit 99.1

Rhea-AI Filing Summary

X4 Pharmaceuticals, Inc. filed an 8-K stating it furnished a press release announcing financial results and other business highlights for the third quarter ended September 30, 2025. The release is attached as Exhibit 99.1 and incorporated by reference. The company notes the Item 2.02 information is furnished, not filed, under the Exchange Act.

8-K Event Classification

2 items: 2.02, 9.01

2 items

Item 2.02 Results of Operations and Financial Condition Financial

Disclosure of earnings results, typically an earnings press release or preliminary financials.

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, and exhibit attachments filed with this report.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 5, 2025

X4 PHARMACEUTICALS, INC.

(Exact name of registrant as specified in its charter)

Delaware

001-38295

27-3181608

(State or other jurisdiction of incorporation)

(Commission File Number)

(IRS Employer Identification No.)

61 North Beacon Street,			4th Floor
Boston,			Massachusetts						02134
(Address of principal executive offices)									(Zip Code)

(857) 529-8300

(Registrant’s telephone number, including area code)

Not applicable

(Former name or former address, if changed since last report)

_______________________________________________________________________________________________________

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐    Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock, par value $0.001 per share

XFOR

The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Item 2.02 Results of Operations and Financial Condition.

On November 5, 2025, X4 Pharmaceuticals, Inc. (the “Company”) issued a press release announcing its financial results and other business highlights for the third quarter ended September 30, 2025. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

The information furnished under this Item 2.02 in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Item 9.01						Financial Statements and Exhibits.
Exhibit No.						Description
99.1						Press Release issued by X4 Pharmaceuticals, Inc., dated November 5, 2025.
104						Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934 the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

X4 PHARMACEUTICALS, INC.

Date: November 5, 2025

By:

/s/ David H. Kirske

Name:

David H. Kirske

Title:

Chief Financial Officer

FAQ

What did XFOR disclose in this 8-K?

X4 Pharmaceuticals furnished a press release announcing financial results and business highlights for the third quarter ended September 30, 2025.

Which period does the press release cover for XFOR?

It covers the third quarter ended September 30, 2025.

Which exhibit contains the press release for XFOR?

Exhibit 99.1 contains the press release dated November 5, 2025.

Is the Item 2.02 information considered filed?

No. The company states the Item 2.02 information is furnished and not filed under the Exchange Act.

What is XFOR’s trading symbol and exchange?

The trading symbol is XFOR, and the common stock is listed on The Nasdaq Stock Market LLC.