X0508 4 2026-02-20 0 0001111928 IPG PHOTONICS CORP IPGP 0001130423 IP FIBRE DEVICES LTD C/O IPG PHOTONICS CORPORATION 377 SIMARANO DRIVE MARLBOROUGH MA 01752 0 0 1 0 1 Common Stock 2026-02-20 4 S 0 500 128.79 D 6592669 D Common Stock 2026-02-20 4 S 0 2300 129.93 D 6590369 D Common Stock 2026-02-20 4 S 0 4461 131.11 D 6585908 D Common Stock 2026-02-20 4 S 0 16422 132.21 D 6569486 D Common Stock 2026-02-20 4 S 0 5484 132.94 D 6564002 D Common Stock 2026-02-23 4 S 0 4241 131.41 D 6559761 D Common Stock 2026-02-23 4 S 0 4604 132.31 D 6555157 D Common Stock 2026-02-23 4 S 0 7994 133.61 D 6547163 D Common Stock 2026-02-23 4 S 0 16421 134.35 D 6530742 D Common Stock 2026-02-23 4 S 0 120 134.95 D 6530622 D Common Stock 2026-02-24 4 S 0 100 135.28 D 6530522 D Common Stock 2026-02-24 4 S 0 1520 137 D 6529002 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2025. The reported transaction involves sale transactions ranging from $128.33 to $129.10 per share. The weighted average price per share was $128.79. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price. The reported transaction involves sale transactions ranging from $129.49 to $130.28 per share. The weighted average price per share was $129.93. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price. The reported transaction involves sale transactions ranging from $130.64 to $131.17 per share. The weighted average price per share was $131.11. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price. The reported transaction involves sale transactions ranging from $131.74 to $132.72 per share. The weighted average price per share was $132.21. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price. The reported transaction involves sale transactions ranging from $132.75 to $133.35 per share. The weighted average price per share was $132.94. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price. The reported transaction involves sale transactions ranging from $130.84 to $131.82 per share. The weighted average price per share was $131.41. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price. The reported transaction involves sale transactions ranging from $131.88 to $132.82 per share. The weighted average price per share was $132.31. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price. The reported transaction involves sale transactions ranging from $132.91 to $133.90 per share. The weighted average price per share was $133.61. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price. The reported transaction involves sale transactions ranging from $133.91 to $134.81 per share. The weighted average price per share was $134.35. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price. The reported transaction involves sale transactions ranging from $134.92 to $135.12 per share. The weighted average price per share was $134.95. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price. The reported transaction involves sale transactions ranging from $136.60 to $137.53 per share. The weighted average price per share was $137.00. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer, information regarding the number of shares sold at each separate price. /s/ Adam N. King, Attorney-in-Fact 2026-02-24