UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): June 24, 2025

XBIOTECH INC.

(Exact name of Registrant as specified in its charter)

British Columbia, Canada

(State of Incorporation)

001-37347

(Commission File Number)

N/A

(I.R.S. Employer Identification No.)

	5217 Winnebago Ln, Austin, TX	78744
	(Address of principal executive offices)	(Zip Code)

(512) 386-2900

(Registrant’s telephone number, including area code)

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, no par value	XBIT	NASDAQ Global Select Market

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 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

XBiotech Inc. (“XBiotech” or the “Company”) files this Form 8-K/A solely to clarify information regarding director Craig Rademaker’s position at the private equity firm referenced in the first sentence of the third paragraph of the June 24, 2025 Form 8-K previously filed by the Company. That sentence is restated as follows.

Mr. Rademaker is a consultant to a number of Canadian private equity firms. His responsibilities principally include capital markets activities.

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.

Date: October 15, 2025	XBIOTECH INC.

	By:	/s/John Simard
		John Simard
		Chief Executive Officer and President

XBiotech Inc. 8-K/A