IPG PHOTONICS CORP

During the Registrant's last fiscal quarter ended June 30, 2025, the following director and executive officers of the Registrant adopted Rule 10b5-1 trading arrangements:

•on May 28, 2025, Mr. Trevor Ness, Senior Vice President, Sales and Strategic Business Development of the Registrant, adopted a Rule 10b5-1 trading arrangement for the sale of up to 6,715 shares over a period beginning August 18, 2025 and ending February 17, 2026 on the open market at prevailing prices, subject to minimum price thresholds; and

•on June 13, 2025, 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 (of which Dr. Scherbakov and Mr. Lopresti are trustees): the Valentin Gapontsev Trust I, the Valentin Gapontsev Trust II, the Valentin Gapontsev Trust III and a related company, IP Fibre Devices (UK) Limited. The arrangement allows for the sale of up to 16,000 shares by Dr. Scherbakov and up to 6,000 shares by Mr. Lopresti, over a period beginning September 15, 2025 and ending February 27, 2026 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, or terminated 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.