IPG PHOTONICS CORP

During the Registrant's last fiscal quarter ended March 31, 2026, the following director and executive officers of the Registrant adopted Rule 10b5-1 trading arrangements:

•on March 17, 2026, Mr. Trevor Ness, Senior Vice President, Chief Revenue Officer of the Registrant, adopted a Rule 10b5-1 trading arrangement for the sale of up to 12,212 shares, including shares acquired upon exercise of stock options, over a period beginning June 17, 2026 and ending June 16, 2027 on the open market at prevailing prices, subject to minimum price thresholds; and

•on March 17, 2026 Dr. Eugene Scherbakov, Director of the Registrant, and Mr. Angelo P. Lopresti, Senior Vice President, General Counsel and Corporate Secretary of the Registrant, adopted a joint Rule 10b5-1 trading arrangement with the following trusts: the Valentin Gapontsev Trust I, the Valentin Gapontsev Trust II, the Valentin Gapontsev Trust III (of which Dr. Scherbakov and Mr. Lopresti are trustees), and Share 1 GST Exempt Marital Share A under Article III of Valentin Gapontsev Trust I U/A DTD 08/01/2022, and a related company, IP Fibre Devices (UK) Limited. The arrangement allows for the sale of up to 15,240 shares by Dr. Scherbakov and up to 17,184 shares by Mr. Lopresti, over a period beginning June 17, 2026 and ending April 17, 2027 on the open market at prevailing prices, subject to minimum price thresholds.

Other than those disclosed above, none of our directors or executive officers adopted, modified, orterminated a Rule 10b5-1 trading arrangement or "non-Rule 10b5-1 trading arrangement," in each case as defined in Item 408 of Regulation S-K during the quarter.