Specialized Disclosure Report (Form SD)

AtriCure, Inc.

Conflict Minerals Report

For the Year Ended December 31, 2025

This report for the year ended December 31, 2025 (the Reporting Period) is presented to comply with Rule 13p-1 under the Securities Exchange Act of 1934 (the Rule). The Rule was adopted by the Securities and Exchange Commission (SEC) to implement reporting and disclosure requirements related to conflict minerals as directed by the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (Dodd-Frank Act). The Rule imposes certain reporting obligations on SEC registrants whose manufactured products contain conflict minerals which are necessary to the functionality or production of their products. Conflict minerals are defined as cassiterite, columbite-tantalite, gold, wolframite and their derivatives, which are limited to tin, tantalum, tungsten and gold (collectively, 3TG) for the purposes of this assessment. Additionally, this report is presented to comply with the Public Statement on the Effect of the Recent Court of Appeals Decision on the Conflict Minerals Rule issued by the Director of the Division of Corporation Finance of the Securities and Exchange Commission on April 24, 2014 and the Updated Statement on the Effect of the Court of Appeals Decision on the Conflict Minerals Rule issued on April 7, 2017, which states that companies must continue to comply with the requirements of Items 1.01(a) and (b) of Form SD, which require a description of the company's reasonable country of origin inquiry. However, companies will not face enforcement actions if they fail to conduct due diligence on the source and chain of custody of conflict minerals required by Item 1.01(c) of Form SD (collectively, the SEC Statements). These requirements apply to all registrants, regardless of the geographic origin of the conflict minerals and whether or not they fund armed conflict.

If a registrant can establish that the conflict minerals originated from sources other than the Democratic Republic of the Congo (DRC) or an adjoining country (the Covered Countries), or from recycled and scrap sources, it must submit a Form SD which describes the Reasonable Country of Origin Inquiry (RCOI) completed.

If a registrant has reason to believe that any of the conflict minerals in its supply chain may have originated in the Covered Countries, or if it is unable to determine the country of origin of those conflict minerals, then the registrant must exercise due diligence on the conflict minerals' source and chain of custody. The registrant must annually submit a Conflict Minerals Report (CMR) to the SEC that includes a description of those due diligence measures.