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): April 11, 2019

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.)
955 Massachusetts Avenue, 4th Floor Cambridge, Massachusetts		02139
(Address of principal executive offices)		(Zip Code)

Registrant’s telephone number, including area code: (857) 529-8300

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 (see General Instruction A.2. below):

☐ 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))

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 8.01 Other Events.

As previously disclosed, on March 8, 2019, X4 Pharmaceuticals, Inc., formerly Arsanis, Inc. (the “Company” or “Arsanis”), Artemis AC Corp., a wholly owned subsidiary of Arsanis, X4 Therapeutics, Inc., formerly X4 Pharmaceuticals, Inc., and Arsanis Biosciences GmbH (“Arsanis GmbH”), a wholly owned subsidiary of Arsanis, entered into a settlement agreement (the “Settlement Agreement”) with Österreichische Forschungsförderungsgesellschaft GmbH (“FFG”), in respect of the previously reported allegations by FFG that Arsanis and Arsanis GmbH breached certain reporting, performance and other obligations in connection with the grants and loans made by FFG to Arsanis GmbH to fund qualifying research and development expenditures. A copy of the Settlement Agreement is attached hereto as Exhibit 10.1 and incorporated by reference in this Item 8.01.

The Company has attached hereto as Exhibit 99.1 and Exhibit 99.2 and incorporated by reference in this Item 8.01 an updated description of the Company’s business and updated risk factors of the Company, respectively.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit Number	Description
10.1	Settlement Agreement, dated as of March 8, 2019, by and among X4 Pharmaceuticals, Inc. (formerly Arsanis, Inc.), Artemis AC Corp., X4 Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.), Arsanis Biosciences GmbH and Österreichische Forschungsförderungsgesellschaft GmbH.
99.1	Description of the Business of X4 Pharmaceuticals, Inc.
99.2	Risk Factors of X4 Pharmaceuticals, Inc.

SIGNATURES

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: April 11, 2019	/s/ Paula Ragan, Ph.D.
	Paula Ragan, Ph.D.
	President and Chief Executive Officer