ESS Tech, Inc. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| NIGGLI MICHAEL R | — | Purchase | 20,000 | $1.13 | $22,600 | 603,821 | May 12, 2023 |
| Dresselhuys Eric P. | Chief Executive Officer | Award / Grant | 622,771 | — | — | 1,966,851 | Apr 26, 2023 |
| Rabb Anthony | Chief Financial Officer | Award / Grant | 76,452 | — | — | 692,468 | Mar 13, 2023 |
| Evans Craig E | President | Award / Grant | 467,694 | — | — | 2,859,868 | Mar 13, 2023 |
| Rabb Anthony | Chief Financial Officer | Award / Grant | 77,949 | — | — | 693,965 | Mar 13, 2023 |
| Teamey Kyle | — | Purchase | 2,500 | $1.61 | $4,025 | 31,986 | Mar 7, 2023 |
| NIGGLI MICHAEL R | — | Purchase | 5,000 | $1.65 | $8,250 | 583,821 | Mar 6, 2023 |
| Dresselhuys Eric P. | Chief Executive Officer | Sale | 23,440 | $2.04 | $47,818 | 1,344,080 | Feb 21, 2023 |
| Evans Craig E | President | Sale | 5,536 | $2.04 | $11,293 | 5,561,524 | Feb 21, 2023 |
| NIGGLI MICHAEL R | — | Purchase | 19,100 | $2.56 | $48,896 | 578,821 | Dec 15, 2022 |
| Evans Craig E | President | Sale | 50,000 | $3.52 | $176,000 | 5,591,617 | Nov 21, 2022 |
| Dresselhuys Eric P. | Chief Executive Officer | Sale | 14,339 | $3.82 | $54,775 | 1,367,520 | Nov 21, 2022 |
| Moftakhar Amir | Chief Financial Officer | Sale | 4,193 | $3.48 | $14,592 | 563,043 | Oct 19, 2022 |
| Song Julia | Chief Technology Officer | Sale | 12,628 | $3.72 | $46,976 | 2,453,439 | Oct 17, 2022 |
| Dresselhuys Eric P. | Chief Executive Officer | Sale | 19,398 | $3.72 | $72,161 | 1,401,257 | Oct 17, 2022 |
| Moftakhar Amir | Chief Financial Officer | Sale | 16,720 | $3.72 | $62,198 | 567,236 | Oct 17, 2022 |
| Moftakhar Amir | Chief Financial Officer | Sale | 63,205 | $4.03 | $254,716 | 583,956 | Oct 17, 2022 |
| WELLMAN ALEXI | — | Award / Grant | 29,486 | — | — | 42,558 | Jun 1, 2022 |
| NIGGLI MICHAEL R | — | Award / Grant | 29,486 | — | — | 559,721 | Jun 1, 2022 |
| Wilson Daryl C | — | Award / Grant | 29,486 | — | — | 75,850 | Jun 1, 2022 |
| Teamey Kyle | — | Award / Grant | 29,486 | — | — | 29,486 | Jun 1, 2022 |
| Garabedian Raffi | — | Award / Grant | 29,486 | — | — | 54,354 | Jun 1, 2022 |
| Gast Claudia | — | Award / Grant | 29,486 | — | — | 59,694 | Jun 1, 2022 |
| NIGGLI MICHAEL R | — | Purchase | 20,000 | $5.01 | $100,200 | 530,235 | Mar 1, 2022 |
| Gast Claudia | — | Award / Grant | 30,208 | — | — | 30,208 | Feb 17, 2022 |
| Dresselhuys Eric P. | Chief Executive Officer | Award / Grant | 622,771 | — | — | 1,491,941 | Feb 16, 2022 |
| Song Julia | Chief Technology Officer | Award / Grant | 268,358 | — | — | 5,641,617 | Feb 8, 2022 |
| Moftakhar Amir | Chief Financial Officer | Award / Grant | 268,358 | — | — | 647,161 | Feb 8, 2022 |
| Bodner Jeff | Chief Accounting Officer | Award / Grant | 32,934 | — | — | 54,900 | Feb 8, 2022 |
| Dresselhuys Eric P. | Chief Executive Officer | Sale | 59,642 | $6.05 | $360,834 | 869,170 | Jan 24, 2022 |
| Evans Craig E | President | Sale | 1,342 | $6.05 | $8,119 | 5,373,083 | Jan 24, 2022 |
| Dresselhuys Eric P. | Chief Executive Officer | Award / Grant | 88,031 | — | — | 928,812 | Jan 17, 2022 |
| Song Julia | Chief Technology Officer | Award / Grant | 2,934 | — | — | 5,374,425 | Jan 17, 2022 |
| Dresselhuys Eric P. | Chief Executive Officer | Tax Withholding | 52,216 | $11.50 | $600,484 | 840,781 | Jan 4, 2022 |
| Evans Craig E | President | Tax Withholding | 20,193 | $11.50 | $232,220 | 5,371,491 | Jan 4, 2022 |
| Moftakhar Amir | Chief Financial Officer | Tax Withholding | 37,821 | $11.50 | $434,942 | 378,793 | Jan 4, 2022 |
| Bodner Jeff | Chief Accounting Officer | Tax Withholding | 4,225 | $11.50 | $48,588 | 21,966 | Jan 4, 2022 |
| Dresselhuys Eric P. | Chief Executive Officer | Award / Grant | 762,938 | — | — | 892,997 | Dec 17, 2021 |
| Bodner Jeff | Chief Accounting Officer | Award / Grant | 15,000 | — | — | 26,191 | Dec 17, 2021 |
| WELLMAN ALEXI | — | Award / Grant | 13,072 | — | — | 13,072 | Dec 17, 2021 |
| Moftakhar Amir | Chief Financial Officer | Award / Grant | 101,026 | — | — | 416,614 | Nov 15, 2021 |
| NIGGLI MICHAEL R | — | Other | 77,822 | $10.00 | $778,220 | 568,302 | Nov 15, 2021 |
| Bodner Jeff | Chief Accounting Officer | Award / Grant | 11,191 | — | — | 11,191 | Nov 15, 2021 |
| Garabedian Raffi | — | Award / Grant | 24,868 | — | — | 24,868 | Nov 15, 2021 |
| Dresselhuys Eric P. | Chief Executive Officer | Award / Grant | 130,059 | — | — | 130,059 | Nov 15, 2021 |
| Wilson Daryl C | — | Award / Grant | 46,364 | — | — | 46,364 | Nov 15, 2021 |
| Song Julia | Chief Technology Officer | Other | 304,194 | $10.00 | $3,041,940 | 2,221,405 | Nov 9, 2021 |
| Moftakhar Amir | Chief Financial Officer | Other | 43,216 | $10.00 | $432,160 | 315,588 | Nov 9, 2021 |
| NIGGLI MICHAEL R | — | Other | 11,670 | $10.00 | $116,700 | 85,225 | Nov 9, 2021 |
| Breakthrough Energy Ventures, LLC | — | Other | 20,096 | — | — | 18,558,721 | Nov 9, 2021 |