374Water's three largest insider shareholders as of September 29, 2026 are Yaacov Nagar (Chief Executive Officer, 1.77Mn shares), Marc Deshusses (Director, 271.83K shares), Terry Merrell (Director, 72.61K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Yaacov Nagar | Chief Executive Officer | 1,771,263 | 0 | 1,771,263 | 80.8% | 30 Apr, 2026 |
| 2 | Marc Deshusses | Director, TenPercentOwner | 271,829 | 0 | 271,829 | 12.4% | 19 Nov, 2024 |
| 3 | James Michael Vanderhider | Director | 7,154 | 17,040 | 24,194 | 1.1% | 02 Sep, 2025 |
| 4 | Kline Russell | Chief Financial Officer | 19,991 | 0 | 19,991 | 0.9% | 18 Dec, 2025 |
| 5 | Stephen J Jones | Interim Ceo | 19,937 | 0 | 19,937 | 0.9% | 16 Dec, 2025 |
| 6 | Richard H Davis | Director | 17,600 | 0 | 17,600 | 0.8% | 02 Jan, 2025 |
| 7 | Peter Mandel | General Counsel | 13,799 | 0 | 13,799 | 0.6% | 02 Sep, 2025 |
| 8 | Deanna Rene Estes | Director | 11,520 | 0 | 11,520 | 0.5% | 02 Sep, 2025 |
| 9 | Rajesh Ramaswamy Melkote | Chief Technology Officer | 10,593 | 0 | 10,593 | 0.5% | 02 Sep, 2025 |
| 10 | James Pawloski | Director | 9,753 | 0 | 9,753 | 0.4% | 02 Sep, 2025 |
| 11 | Buddie J Penn | Director | 7,656 | 0 | 7,656 | 0.3% | 02 Sep, 2025 |
| 12 | Brad Ian Meyers | Chief Operating Officer | 5,880 | 0 | 5,880 | 0.3% | 28 Aug, 2025 |
| 13 | Israel David Abitbol | Chief Financial Officer | 4,833 | 0 | 4,833 | 0.2% | 20 Apr, 2023 |
| 14 | Adrienne Anderson | Chief Financial Officer | 1,602 | 0 | 1,602 | 0.1% | 19 Nov, 2024 |
| 15 | Chris M Gannon | President Ceo | 1,440 | 0 | 1,440 | 0.1% | 19 Nov, 2024 |
| 16 | Terry Merrell | Director | 480 | 0 | 480 | 0.0% | 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 | Stephen J Jones | Interim Ceo | Acquired P | 450,000 | $19.26 | $8.67Mn | 12,669 | 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 |
| 09 Oct, 2025 | Rajesh Ramaswamy Melkote | Chief Technology Officer | Acquired A | 500,000 | $0.00 | $0 | 6,000 | Direct |
| 20 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 13,330 | $35.07 | $467.44K | 395,568 | Direct |
| 21 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 284,394 | $35.03 | $9.96Mn | 392,156 | Direct |
| 22 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 32,791 | $35.08 | $1.15Mn | 391,762 | Direct |
| 16 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 85,419 | $42.72 | $3.65Mn | 397,308 | Direct |
| 17 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 131,680 | $35.25 | $4.64Mn | 395,728 | Direct |
| 14 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 700,000 | $43.03 | $30.12Mn | 402,700 | Direct |
| 15 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 363,868 | $43.16 | $15.70Mn | 398,333 | Direct |
| 09 Oct, 2025 | Brad Ian Meyers | Chief Operating Officer | Acquired A | 500,000 | $0.00 | $0 | 8,772 | Direct |
| 09 Oct, 2025 | Kline Russell | Chief Financial Officer | Acquired A | 500,000 | $0.00 | $0 | 9,704 | Direct |
| 08 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 1,499,000 | $38.68 | $57.97Mn | 411,100 | Direct |
| 07 Oct, 2025 | Yaacov Nagar | TenPercentOwner | Disposed S | 1,000 | $32.50 | $32.50K | 429,088 | Direct |
| 07 Oct, 2025 | Stephen J Jones | Interim Ceo | Acquired A | 4,500,000 | $0.00 | $0 | 54,000 | Direct |