As of September 09, 2026, the three largest insider holders of SCWO are Yaacov Nagar (Chief Executive Officer, 3.21Mn shares), Marc Deshusses (Director, 2.27Mn shares), Yaacov Nagar (Chief Executive Officer, 1.77Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Marc Deshusses | Director, TenPercentOwner | 2,265,245 | 0 | 2,265,245 | 44.7% | 19 Nov, 2024 |
| 2 | Yaacov Nagar | Chief Executive Officer | 1,771,263 | 0 | 1,771,263 | 34.9% | 30 Apr, 2026 |
| 3 | James Michael Vanderhider | Director | 59,613 | 142,000 | 201,613 | 4.0% | 02 Sep, 2025 |
| 4 | Kline Russell | Chief Financial Officer | 166,593 | 0 | 166,593 | 3.3% | 18 Dec, 2025 |
| 5 | Richard H Davis | Director | 146,669 | 0 | 146,669 | 2.9% | 02 Jan, 2025 |
| 6 | Peter Mandel | General Counsel | 114,993 | 0 | 114,993 | 2.3% | 02 Sep, 2025 |
| 7 | Deanna Rene Estes | Director | 95,997 | 0 | 95,997 | 1.9% | 02 Sep, 2025 |
| 8 | Rajesh Ramaswamy Melkote | Chief Technology Officer | 88,276 | 0 | 88,276 | 1.7% | 02 Sep, 2025 |
| 9 | James Pawloski | Director | 81,273 | 0 | 81,273 | 1.6% | 02 Sep, 2025 |
| 10 | Buddie J Penn | Director | 63,796 | 0 | 63,796 | 1.3% | 02 Sep, 2025 |
| 11 | Israel David Abitbol | Chief Financial Officer | 40,272 | 0 | 40,272 | 0.8% | 20 Apr, 2023 |
| 12 | Adrienne Anderson | Chief Financial Officer | 13,352 | 0 | 13,352 | 0.3% | 19 Nov, 2024 |
| 13 | Chris M Gannon | President Ceo | 12,000 | 0 | 12,000 | 0.2% | 19 Nov, 2024 |
| 14 | Brad Ian Meyers | Chief Operating Officer | 5,880 | 0 | 5,880 | 0.1% | 28 Aug, 2025 |
| 15 | Terry Merrell | Director | 4,000 | 0 | 4,000 | 0.1% | 19 Nov, 2024 |
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 |
|---|---|---|---|---|---|---|---|---|
| 01 Jul, 2026 | Charles Maurice Weiser | Chief Financial Officer | Acquired A | 150,000 | $0.00 | $0 | 150,000 | Direct |
| 01 Jul, 2026 | Charles Maurice Weiser | Chief Financial Officer | Acquired A | 125,000 | $0.00 | $0 | 125,000 | Direct |
| 30 Apr, 2026 | Yaacov Nagar | TenPercentOwner | Disposed G | 1,440,000 | $2.48 | $3.57Mn | 1,771,263 | Direct |
| 16 Dec, 2025 | Kline Russell | Chief Financial Officer | Acquired P | 20,000 | $18.33 | $366.67K | 8,024 | Direct |
| 16 Dec, 2025 | Kline Russell | Chief Financial Officer | Acquired P | 20,000 | $2.20 | $44.00K | 66,864 | Direct |
| 16 Dec, 2025 | Kline Russell | Chief Financial Officer | Acquired P | 20,000 | $2.20 | $44.00K | 66,864 | Direct |
| 16 Dec, 2025 | Kline Russell | Chief Financial Officer | Acquired P | 20,000 | $2.20 | $44.00K | 66,864 | Direct |
| 22 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 61,000 | $4.21 | $256.81K | 3,258,584 | Direct |
| 22 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 61,000 | $4.21 | $256.81K | 3,258,584 | Direct |
| 22 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 61,000 | $4.21 | $256.81K | 3,258,584 | Direct |
| 22 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 61,000 | $35.08 | $2.14Mn | 391,030 | Direct |
| 23 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 473,211 | $36.17 | $17.11Mn | 385,352 | Direct |
| 23 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 473,211 | $4.34 | $2.05Mn | 3,211,263 | Direct |
| 23 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 473,211 | $4.34 | $2.05Mn | 3,211,263 | Direct |
| 23 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 473,211 | $4.34 | $2.05Mn | 3,211,263 | Direct |
| 09 Oct, 2025 | Rajesh Ramaswamy Melkote | Chief Technology Officer | Acquired A | 500,000 | $0.00 | $0 | 6,000 | Direct |
| 09 Oct, 2025 | Rajesh Ramaswamy Melkote | Chief Technology Officer | Acquired A | 500,000 | $0.00 | $0 | 50,000 | Direct |
| 09 Oct, 2025 | Rajesh Ramaswamy Melkote | Chief Technology Officer | Acquired A | 500,000 | $0.00 | $0 | 50,000 | Direct |
| 09 Oct, 2025 | Rajesh Ramaswamy Melkote | Chief Technology Officer | Acquired A | 500,000 | $0.00 | $0 | 50,000 | Direct |
| 20 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 13,330 | $4.21 | $56.09K | 3,296,403 | Direct |