374Water's three largest insider shareholders as of April 28, 2026 are Yaacov Nagar (Chief Executive Officer, 3.21Mn shares), Marc Deshusses (Director, 2.27Mn shares), Terry Merrell (Director, 605.06K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Yaacov Nagar | Chief Executive Officer | 3,211,263 | 0 | 24 Oct, 2025 |
| Marc Deshusses | - | 2,265,245 | 0 | 19 Nov, 2024 |
| Terry Merrell | - | 0 | 605,058 | 02 Jun, 2023 |
| James Michael Vanderhider | - | 0 | 142,000 | 19 Nov, 2024 |
| Richard H Davis | - | 114,379 | 0 | 02 Jan, 2025 |
| Stephen J Jones | Interim Ceo | 105,572 | 0 | 16 Dec, 2025 |
| Rajesh Ramaswamy Melkote | Chief Technology Officer | 88,276 | 0 | 02 Sep, 2025 |
| Deanna Rene Estes | - | 85,347 | 0 | 02 Sep, 2025 |
| Kline Russell | Chief Financial Officer | 66,864 | 0 | 18 Dec, 2025 |
| Kline Russell | Chief Financial Officer | 64,864 | 0 | 02 Sep, 2025 |
| Peter Mandel | General Counsel | 63,858 | 0 | 02 Sep, 2025 |
| James Pawloski | - | 61,943 | 0 | 02 Sep, 2025 |
| Stephen J Jones | - | 60,572 | 0 | 02 Sep, 2025 |
| James Michael Vanderhider | - | 59,613 | 0 | 02 Sep, 2025 |
| Buddie J Penn | - | 57,796 | 0 | 02 Sep, 2025 |
| Brad Ian Meyers | Chief Operating Officer | 49,000 | 0 | 28 Aug, 2025 |
| Israel David Abitbol | Chief Financial Officer | 40,272 | 0 | 20 Apr, 2023 |
| Kline Russell | Chief Financial Officer | 34,864 | 0 | 17 Jan, 2025 |
| Richard H Davis | - | 32,290 | 0 | 19 Nov, 2024 |
| Peter Mandel | General Counsel | 26,358 | 0 | 20 Aug, 2025 |
| Peter Mandel | General Counsel | 24,778 | 0 | 19 Nov, 2024 |
| James Pawloski | - | 19,330 | 0 | 26 Aug, 2025 |
| Richard H Davis | - | 0 | 16,053 | 19 Nov, 2024 |
| Chris M Gannon | President Ceo | 12,000 | 0 | 19 Nov, 2024 |
| Deanna Rene Estes | - | 10,650 | 0 | 27 Aug, 2025 |
| Adrienne Anderson | Chief Financial Officer | 7,176 | 0 | 19 Nov, 2024 |
| Adrienne Anderson | Chief Financial Officer | 6,176 | 0 | 19 Nov, 2024 |
| Buddie J Penn | - | 6,000 | 0 | 19 Nov, 2024 |
| Terry Merrell | - | 4,000 | 0 | 19 Nov, 2024 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 16 Dec, 2025 | Kline Russell | Common Stock | A | 20,000 | $0.22 | 66,864 | D | P |
| 16 Dec, 2025 | Stephen J Jones | Common Stock | A | 450,000 | $0.23 | 105,572 | D | P |
| 22 Oct, 2025 | Yaacov Nagar | Common Stock | D | 61,000 | $0.42 | 3,258,584 | D | S |
| 23 Oct, 2025 | Yaacov Nagar | Common Stock | D | 473,211 | $0.43 | 3,211,263 | D | S |
| 09 Oct, 2025 | Rajesh Ramaswamy Melkote | Stock options (right to buy) | A | 500,000 | $0.00 | 50,000 | D | A |
| 20 Oct, 2025 | Yaacov Nagar | Common Stock | D | 13,330 | $0.42 | 3,296,403 | D | S |
| 21 Oct, 2025 | Yaacov Nagar | Common Stock | D | 284,394 | $0.42 | 3,267,963 | D | S |
| 22 Oct, 2025 | Yaacov Nagar | Common Stock | D | 32,791 | $0.42 | 3,264,684 | D | S |
| 16 Oct, 2025 | Yaacov Nagar | Common Stock | D | 85,419 | $0.51 | 3,310,904 | D | S |
| 17 Oct, 2025 | Yaacov Nagar | Common Stock | D | 131,680 | $0.42 | 3,297,736 | D | S |
| 14 Oct, 2025 | Yaacov Nagar | Common Stock | D | 700,000 | $0.52 | 3,355,833 | D | S |
| 15 Oct, 2025 | Yaacov Nagar | Common Stock | D | 363,868 | $0.52 | 3,319,446 | D | S |
| 09 Oct, 2025 | Kline Russell | Stock options (right to buy) | A | 500,000 | $0.00 | 80,864 | D | A |
| 09 Oct, 2025 | Brad Ian Meyers | Stock options (right to buy) | A | 500,000 | $0.00 | 73,100 | D | A |
| 08 Oct, 2025 | Yaacov Nagar | Common Stock | D | 1,499,000 | $0.46 | 3,425,833 | D | S |
| 07 Oct, 2025 | Yaacov Nagar | Common Stock | D | 1,000 | $0.39 | 3,575,733 | D | S |
| 07 Oct, 2025 | Stephen J Jones | Stock options (right to buy) | A | 4,500,000 | $0.00 | 450,000 | D | A |
| 05 Sep, 2025 | Yaacov Nagar | Common Stock | D | 122,439 | $0.39 | 3,581,318 | D | S |
| 08 Sep, 2025 | Yaacov Nagar | Common Stock | D | 54,850 | $0.40 | 3,575,833 | D | S |
| 29 Aug, 2025 | Yaacov Nagar | Common Stock | D | 22,711 | $0.39 | 3,593,561 | D | S |