GNTX's three largest insider shareholders as of September 09, 2026 are Steven R Downing (President And Ceo, 255.16K shares), Richard O Schaum (Director, 87.07K shares), Richard O Schaum (Director, 79.26K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Steven R Downing | President And Ceo | 255,162 | 0 | 255,162 | 30.1% | 19 Feb, 2026 |
| 2 | Richard O Schaum | Director | 87,069 | 0 | 87,069 | 10.3% | 22 May, 2026 |
| 3 | Neil Boehm | Chief Technology Officer | 73,904 | 0 | 73,904 | 8.7% | 19 Feb, 2026 |
| 4 | Kevin C Nash | Chief Financial Officer | 73,310 | 0 | 73,310 | 8.7% | 19 Feb, 2026 |
| 5 | Scott P Ryan | General Counsel | 55,279 | 0 | 55,279 | 6.5% | 19 Feb, 2026 |
| 6 | Matthew Chiodo | Vice President Of Sales | 47,148 | 0 | 47,148 | 5.6% | 18 Feb, 2026 |
| 7 | Leslie L Brown | Director | 41,988 | 0 | 41,988 | 5.0% | 22 May, 2026 |
| 8 | Kathleen Starkoff | Director | 36,770 | 0 | 36,770 | 4.3% | 22 May, 2026 |
| 9 | James A Hollars | Director | 36,149 | 0 | 36,149 | 4.3% | 22 May, 2023 |
| 10 | Ling Zang | Director | 35,599 | 0 | 35,599 | 4.2% | 22 May, 2026 |
| 11 | John A Mulder | Director | 34,365 | 0 | 34,365 | 4.1% | 28 Jul, 2021 |
| 12 | James H Wallace | Director | 28,709 | 0 | 28,709 | 3.4% | 01 Nov, 2022 |
| 13 | Garth Deur | Director | 20,045 | 0 | 20,045 | 2.4% | 22 May, 2026 |
| 14 | Billy Pink | Director | 15,329 | 0 | 15,329 | 1.8% | 22 May, 2026 |
| 15 | John C Kennedy | Director | 5,626 | 0 | 5,626 | 0.7% | 22 May, 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 |
|---|---|---|---|---|---|---|---|---|
| 21 May, 2026 | Richard O Schaum | Director | Acquired A | 5,626 | $0.00 | $0 | 87,069 | Direct |
| 21 May, 2026 | Garth Deur | Director | Acquired A | 5,626 | $0.00 | $0 | 20,045 | Direct |
| 21 May, 2026 | Kathleen Starkoff | Director | Acquired A | 5,626 | $0.00 | $0 | 36,770 | Direct |
| 21 May, 2026 | Ling Zang | Director | Acquired A | 5,626 | $0.00 | $0 | 35,599 | Direct |
| 21 May, 2026 | Leslie L Brown | Director | Acquired A | 5,626 | $0.00 | $0 | 41,988 | Direct |
| 21 May, 2026 | Billy Pink | Director | Acquired A | 5,626 | $0.00 | $0 | 15,329 | Direct |
| 21 May, 2026 | John C Kennedy | Director | Acquired A | 5,626 | $0.00 | $0 | 5,626 | Direct |
| 15 May, 2026 | Joseph B Jr Anderson | Director | Disposed S | 5,939 | $22.98 | $136.45K | 0 | Direct |
| 05 May, 2026 | Leslie L Brown | Director | Acquired M | 7,000 | $15.74 | $110.18K | 40,144 | Direct |
| 05 May, 2026 | Leslie L Brown | Director | Acquired M | 7,000 | $18.70 | $130.90K | 47,144 | Direct |
| 05 May, 2026 | Leslie L Brown | Director | Disposed S | 10,782 | $22.85 | $246.34K | 36,362 | Direct |
| 05 May, 2026 | Leslie L Brown | Director | Acquired M | 7,000 | $0.00 | $0 | 14,000 | Direct |
| 05 May, 2026 | Leslie L Brown | Director | Acquired M | 7,000 | $0.00 | $0 | 7,000 | Direct |
| 30 Apr, 2026 | Richard O Schaum | Director | Acquired M | 7,000 | $15.74 | $110.18K | 86,258 | Direct |
| 30 Apr, 2026 | Richard O Schaum | Director | Disposed S | 4,815 | $23.31 | $112.25K | 81,443 | Direct |
| 30 Apr, 2026 | Richard O Schaum | Director | Acquired M | 7,000 | $0.00 | $0 | 14,000 | Direct |
| 17 Feb, 2026 | Scott P Ryan | General Counsel | Acquired A | 25,782 | $0.00 | $0 | 67,702 | Direct |
| 17 Feb, 2026 | Kevin C Nash | Chief Financial Officer | Acquired A | 38,181 | $0.00 | $0 | 92,485 | Direct |
| 17 Feb, 2026 | Scott P Ryan | General Counsel | Acquired A | 25,782 | $0.00 | $0 | 67,702 | Direct |
| 17 Feb, 2026 | Neil Boehm | Chief Technology Officer | Acquired A | 31,993 | $0.00 | $0 | 87,967 | Direct |