IPGP's three largest insider shareholders as of August 04, 2026 are Gapontsev Trust I Valentin (TenPercentOwner, 6.73Mn shares), Fibre Devices Ltd Ip (TenPercentOwner, 6.53Mn shares), Igor Samartsev (Svp, Chief Scientist, 113.27K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Gapontsev Trust I Valentin | TenPercentOwner | 6,726,599 | 0 | 6,726,599 | 48.5% | 18 Feb, 2026 |
| 2 | Fibre Devices Ltd Ip | TenPercentOwner | 6,529,002 | 0 | 6,529,002 | 47.0% | 24 Feb, 2026 |
| 3 | Mark Milton Gitin | Ceo | 91,873 | 0 | 91,873 | 0.7% | 03 Mar, 2026 |
| 4 | Timothy Pv Mammen | Svp, Chief Financial Officer | 86,413 | 0 | 86,413 | 0.6% | 03 Mar, 2026 |
| 5 | Alexander Ovtchinnikov | Svp, Chief Technology Officer | 74,360 | 0 | 74,360 | 0.5% | 05 Mar, 2024 |
| 6 | Michael C Child | Director | 68,625 | 0 | 68,625 | 0.5% | 28 Jun, 2024 |
| 7 | Angelo P Lopresti | Svp, Secretary Gen Counsel | 60,841 | 0 | 60,841 | 0.4% | 03 Mar, 2026 |
| 8 | Eugene A Scherbakov | Ceo | 51,258 | 0 | 51,258 | 0.4% | 03 Mar, 2026 |
| 9 | Trevor Ness | Svp, Chief Revenue Officer | 38,425 | 0 | 38,425 | 0.3% | 03 Mar, 2026 |
| 10 | Felix I Stukalin | Svp, Chief Operating Officer | 36,316 | 0 | 36,316 | 0.3% | 03 Mar, 2023 |
| 11 | Eric Meurice | Director | 22,803 | 0 | 22,803 | 0.2% | 03 Feb, 2026 |
| 12 | Greg Dougherty | Director | 15,898 | 0 | 15,898 | 0.1% | 21 May, 2025 |
| 13 | John R Peeler | Director | 15,740 | 0 | 15,740 | 0.1% | 21 May, 2025 |
| 14 | Thomas J Burgomaster | Chief Accounting Officer | 11,566 | 0 | 11,566 | 0.1% | 04 Mar, 2025 |
| 15 | Igor Samartsev | Svp, Chief Scientist | 10,449 | 0 | 10,449 | 0.1% | 03 Mar, 2026 |
| 16 | Gregory R Beecher | Director | 9,780 | 0 | 9,780 | 0.1% | 21 May, 2025 |
| 17 | Jeanmarie F. Desmond | Director | 9,740 | 0 | 9,740 | 0.1% | 08 Aug, 2025 |
| 18 | Tang Agnes | Director | 8,663 | 0 | 8,663 | 0.1% | 25 Nov, 2025 |
| 19 | Paulus Bucher | Svp, Global Operations | 6,716 | 0 | 6,716 | 0.0% | 20 Feb, 2026 |
| 20 | Mary E. Buttarazzi | Vp, Corp Controller And Cao | 4,749 | 0 | 4,749 | 0.0% | 17 Mar, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 17 Mar, 2026 | Mary E. Buttarazzi | Vp, Corp Controller And Cao | Disposed S | 500 | $116.22 | $58.11K | 4,749 | Direct |
| 01 Mar, 2026 | Eugene A Scherbakov | Director, TenPercentOwner | Disposed F | 7,237 | $131.57 | $952.17K | 51,258 | Direct |
| 01 Mar, 2026 | Trevor Ness | Svp, Chief Revenue Officer | Disposed F | 3,402 | $131.57 | $447.60K | 38,425 | Direct |
| 01 Mar, 2026 | Trevor Ness | Svp, Chief Revenue Officer | Disposed F | 3,402 | $131.57 | $447.60K | 38,425 | Direct |
| 01 Mar, 2026 | Eugene A Scherbakov | Director, TenPercentOwner | Disposed F | 7,237 | $131.57 | $952.17K | 51,258 | Direct |
| 01 Mar, 2026 | Mary E. Buttarazzi | Vp, Corp Controller And Cao | Disposed F | 435 | $131.57 | $57.23K | 5,249 | Direct |
| 01 Mar, 2026 | Mark Milton Gitin | Ceo | Disposed F | 7,603 | $131.57 | $1.00Mn | 91,873 | Direct |
| 01 Mar, 2026 | Eugene A Scherbakov | Director, TenPercentOwner | Disposed F | 7,237 | $131.57 | $952.17K | 51,258 | Direct |
| 01 Mar, 2026 | Angelo P Lopresti | Svp, Secretary Gen Counsel | Disposed F | 3,848 | $131.57 | $506.28K | 60,841 | Direct |
| 01 Mar, 2026 | Angelo P Lopresti | Svp, Secretary Gen Counsel | Disposed F | 3,848 | $131.57 | $506.28K | 60,841 | Direct |
| 01 Mar, 2026 | Angelo P Lopresti | Svp, Secretary Gen Counsel | Disposed F | 3,848 | $131.57 | $506.28K | 60,841 | Direct |
| 01 Mar, 2026 | Igor Samartsev | Svp, Chief Scientist | Disposed F | 836 | $131.57 | $109.99K | 10,449 | Direct |
| 01 Mar, 2026 | Timothy Pv Mammen | Svp, Chief Financial Officer | Disposed F | 4,310 | $131.57 | $567.07K | 86,413 | Direct |
| 01 Mar, 2026 | Timothy Pv Mammen | Svp, Chief Financial Officer | Disposed F | 4,310 | $131.57 | $567.07K | 86,413 | Direct |
| 01 Mar, 2026 | Igor Samartsev | Svp, Chief Scientist | Disposed F | 836 | $131.57 | $109.99K | 10,449 | Direct |
| 01 Mar, 2026 | Timothy Pv Mammen | Svp, Chief Financial Officer | Disposed F | 4,310 | $131.57 | $567.07K | 86,413 | Direct |
| 01 Mar, 2026 | Igor Samartsev | Svp, Chief Scientist | Disposed F | 836 | $131.57 | $109.99K | 10,449 | Direct |
| 01 Mar, 2026 | Trevor Ness | Svp, Chief Revenue Officer | Disposed F | 3,402 | $131.57 | $447.60K | 38,425 | Direct |
| 24 Feb, 2026 | Eugene A Scherbakov | Director, TenPercentOwner | Disposed S | 200 | $135.72 | $27.14K | 60,995 | Direct |
| 20 Feb, 2026 | Fibre Devices Ltd Ip | TenPercentOwner | Disposed S | 500 | $128.79 | $64.40K | 6,592,669 | Direct |