SCHEDULE 13D/A

IPG Photonics Corp

Common stock, par value $0.0001 per share · CUSIP: 44980X109

Event date: 2025-02-20

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Valentin Gapontsev Trust IReported CIK 0001508155

  Shares: 7,200,599.00 · Class: 16.9%

• Lopresti Angelo PReported CIK 0001378548

  Shares: 8,785,398.00 · Class: 20.6%

• Shcherbakov Eugene AReported CIK 0001378544

  Shares: 15,740,701.00 · Class: 36.9%

• IQ EQ Trust Company, U.S., LLC

  Shares: 9,001,848.00 · Class: 21.2%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.