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SCHEDULE 13D/A 0001508155 XXXXXXXX LIVE 6 Common stock, par value $0.0001 per share 02/20/2025 false 0001111928 44980X109 IPG Photonics Corporation 377 Simarano Drive Marlborough MA 01752 Chip Martin 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 7200599.00 0.00 7200599.00 0.00 7200599.00 N 16.9 OO 0001378548 N Lopresti Angelo P OO N X1 82188.00 8703210.00 82188.00 8703210.00 8785398.00 N 20.6 IN 0001378544 N Shcherbakov Eugene A OO N 2M 7037491.00 8703210.00 7037491.00 8703210.00 15740701.00 N 36.9 IN Y IQ EQ Trust Company, U.S., LLC OO N NH 298638.00 8703210.00 298638.00 8703210.00 9001848.00 N 21.2 OO Common stock, par value $0.0001 per share IPG Photonics Corporation 377 Simarano Drive Marlborough MA 01752 Explanatory Note This Amendment No. 6 ("Amendment No. 6") 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 and January 2, 2024 (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 Information reported in the Schedule 13D remains in effect except to the extent that it is amended, restated or superseded by information contained in this Amendment No. 6. Capitalized terms used but not defined herein have the same meanings ascribed to them in the Schedule 13D. Item 4 of the Schedule 13D is amended and supplemented as follows: On February 20, 2025, the Issuer and IQ EQ Trust Company, U.S., LLC, as trustee of The Valentin Gapontsev Trust I and The Valentin Gapontsev Trust III entered into a Registration Rights Letter pursuant to which the Issuer agreed to register for resale 1,890,000 shares of Common Stock held by The Valentin Gapontsev Trust I and 260,000 shares of Common Stock held by The Valentin Gapontsev Trust III. On February 20, 2025, the Issuer filed a registration statement and prospectus relating to the resale of such shares held by The Valentin Gapontsev Trust I and The Valentin Gapontsev Trust III. The Valentin Gapontsev Trust I and The Valentin Gapontsev Trust III may sell all or a portion of the shares offered in the registration statement from time to time, including by entering into one or more trading plans pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934. Item 5(a) of the Schedule 13D is amended and supplemented as follows: The percentages reported herein are based on 42,548,561 shares of Common Stock outstanding as of February 18, 2025, as reported in the Issuer's Form 10-K filed on February 20, 2025. Exhibit 10.2 Registration Rights Letter, dated as of February 20, 2025, by and between the Issuer and IQ EQ Trust Company, U.S., LLC, as trustee of The Valentin Gapontsev Trust I and The Valentin Gapontsev Trust III (incorporated by reference to Exhibit 10.1 to the Registration Statement on Form S-3 filed by the Issuer with the Securities and Exchange Commission on February 20, 2025). 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 02/20/2025 Lopresti Angelo P /s/ Angelo P. Lopresti Angelo P. Lopresti 02/20/2025 Shcherbakov Eugene A /s/ Eugene Scherbakov Eugene Scherbakov 02/20/2025 IQ EQ Trust Company, U.S., LLC /s/ Christopher C. Martin Christopher C. Martin, President 02/20/2025