X0508 4 2025-10-01 0001626878 XBiotech Inc. XBIT 0002088590 Kuendig Thomas Martin ALPENSTRASSE 23 8803 RUESCHLIKON, KANTON OF ZUERICH RUESCHLIKON V8 8803 SWITZERLAND true false false false false Director Stock Option 2.64 2025-10-01 4 A false 79115 0 A 2025-02-01 2035-10-01 Common Stock 79115 79115 D On October 1, 2025 (the Grant Date) the reporting person was granted nonstatutory stock options (the Options) under the Company's 2025 Equity Incentive Plan to purchase shares of the Company's Common Stock (the Shares) at an exercise price equal to the closing sales price of the Shares on the Grant Date as quoted by the Nasdaq Stock Market. The Options vest in two equal portions at four month and ten month from the Grant Date with an expiry of ten years from the Grant Date.T Thomas Kuendig 2025-11-12