The number of shares to be purchased and the purchase price are preliminary and subject to change.  The preliminary information contained in this press release is subject to confirmation by the depositary and is based on the assumption that all shares tendered through notice of guaranteed delivery will be delivered within the two trading day settlement period.  The final number of shares to be purchased and the final purchase price will be announced following the expiration of the guaranteed delivery period and completion by the depositary of the confirmation process.  Payment for the shares accepted for purchase under the tender offer, and return of all other shares tendered and not purchased, will occur promptly thereafter.

XBiotech is a fully integrated, global biopharmaceutical company dedicated to pioneering the discovery, development and commercialization of therapeutic antibodies. XBiotech currently is advancing a pipeline of therapies by harnessing naturally occurring antibodies from patients with immunity to certain diseases. Utilizing natural human immunity as a source of new medicines offers the potential to redefine the standards of care for a wide range of diseases. The discovery and manufacturing techniques which enable this were designed by and are exclusive to XBiotech. Headquartered in Austin, Texas, XBiotech also leads the development of innovative, proprietary manufacturing technology to reduce the cost and complexity of biological drug production. For more information, visit www.xbiotech.com.

This press release contains forward-looking statements, including declarations regarding management's beliefs and expectations that involve substantial risks and uncertainties. In some cases, you can identify forward-looking statements by terminology such as "may," "will," "should," "would," "could," "expects," "plans," "contemplate," "anticipates," "believes," "estimates," "predicts," "projects," "intend" or "continue" or the negative of such terms or other comparable terminology, although not all forward-looking statements contain these identifying words. Forward-looking statements are subject to inherent risks and uncertainties in predicting future results and conditions that could cause the actual results to differ materially from those projected in these forward-looking statements. These risks and uncertainties are subject to the disclosures set forth in the "Risk Factors" section of certain of our SEC filings. Forward-looking statements are not guarantees of future performance, and our actual results of operations, financial condition and liquidity, and the development of the industry in which we operate, may differ materially from the forward-looking statements contained in this press release. Any forward-looking statements that we make in this press release speak only as of the date of this press release. We assume no obligation to update our forward-looking statements whether as a result of new information, future events or otherwise, after the date of this press release.