Item 8.01. Other Events.

AtriCure, Inc. (the "Company") has obtained a copy of a qui tam complaint against the Company that was unsealed on July 10, 2009. The qui tam complaint, pending in the U.S. District Court for the Southern District of Texas, was originally filed by a relator in August 2007. The complaint alleges a cause of action under the federal False Claims Act relating to AtriCure's alleged marketing practices in connection with its surgical cardiac ablation devices. The Company believes that this complaint is related to the investigation by the Department of Justice previously announced by the Company in its Form 8-K dated October 31, 2008. The Company is currently in the process of evaluating the complaint.

The Company has also become aware that the relator filed similar complaints against at least four other medical device companies that manufacture and sell cardiac ablation devices and that the relator is a former employee of one of the other medical device company defendants. The complaints against the other companies include substantively similar allegations to those made against the Company.

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