X0202 SCHEDULE 13D/A 0001508155-25-000006 0001508155 XXXXXXXX LIVE 7 Common stock, par value $0.0001 per share 02/18/2026 false 0001111928 44980X109 IPG Photonics Corporation 377 Simarano Drive Marlborough MA 01752 Chip Martin, President 603-219-0264 c/o IQ EQ Trust Company, U.S., LLC 3 Executive Park Drive, Suite 302 Bedford NH 03110 0001508155 N Valentin Gapontsev Trust I OO N NH 6670283.00 0.00 6670283.00 0.00 6670283.00 N 15.7 OO 0001378548 N Lopresti Angelo P OO N X1 63705.00 8032281.00 63705.00 8032281.00 8095986.00 N 19.1 IN Y IQ EQ Trust Company, U.S., LLC OO N NH 296638.00 8032281.00 296638.00 8032281.00 8328919.00 N 19.6 OO 0001378544 N Shcherbakov Eugene A OO N 2M 6545429.00 8032281.00 6545429.00 8032281.00 14577710.00 N 34.3 IN Common stock, par value $0.0001 per share IPG Photonics Corporation 377 Simarano Drive Marlborough MA 01752 Explanatory Note This Amendment No. 7 ("Amendment No. 7") to Schedule 13D amends and supplements the Schedule 13D originally filed by certain of the Reporting Persons on December 21, 2010, as amended on January 24, 2011, May 23, 2011, December 17, 2012, November 1, 2021, January 2, 2024 and February 20, 2025 (as amended, the "Schedule 13D"). Information reported in the Schedule 13D remains in effect except to the extent that it is amended, restated or superseded by information contained in this Amendment No. 7. Capitalized terms used but not defined herein have the same meanings ascribed to them in the Schedule 13D. Item 5(a) of the Schedule 13D is amended and supplemented as follows: The percentages reported herein are based on 42,443,616 shares of Common Stock outstanding as of May 4, 2026, as reported in the Issuer's Form 10-Q filed on May 5, 2026. Item 5(c) of the Schedule 13D is amended and supplemented as follows: The transactions in the Common Stock during the 60 days prior to the date of the event that requires filing of this statement through the date hereof are set forth in Exhibit 1 and incorporated herein by reference. Exhibit 1 - Transactions in Securities Valentin Gapontsev Trust I /s/ Angelo P. Lopresti, /s/ Eugene Scherbakov, /s/ Christopher C. Martin Angelo P. Lopresti, Trustee, Eugene Scherbakov, Trustee, and Christopher C. Martin, President of IQ EQ Trust Company, U.S., LLC 07/28/2026 Lopresti Angelo P /s/ Angelo P. Lopresti Angelo P. Lopresti 07/28/2026 IQ EQ Trust Company, U.S., LLC /s/ Christopher C. Martin Christopher C. Martin, President 07/28/2026 Shcherbakov Eugene A /s/ Eugene Scherbakov Eugene Scherbakov 07/28/2026