ESS Tech (GWH)
ESS Tech on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, earnings dates and insider trades. Listed on NYSE, classified by the SEC as miscellaneous electrical machinery, equipment & supplies.
2.1M
Short interest
settlement 2026-09-30
1.3
Days to cover
-1.5 days vs prior
49.8%
Short share of volume
2026-10-01
73,374
Fails to deliver
settlement 2026-09-30
Thu 12 Nov
Next earnings
estimated date
-$4K
Insider flow, 90 days
0 buys, 2 sells
As of 2026-10-01.
Short interest
FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSONAs of 30 September 2026, short interest in GWH is 2,145,222 shares, down 915,823 shares over the last month. Over the last 48 readings it ranged from 348,176 shares (15 November 2024) to 3,061,045 shares (31 August 2026). At the reported average volume of 1.6M shares a day that is 1.3 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/gwh" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 2,145,222 | -11.7% | 1,614,775 | 1.33 |
| 2026-09-15 | 2,428,614 | -20.7% | 851,797 | 2.85 |
| 2026-08-31 | 3,061,045 | +4.8% | 1,444,887 | 2.12 |
| 2026-08-14 | 2,921,333 | +33.5% | 773,427 | 3.78 |
| 2026-07-31 | 2,188,049 | +26.8% | 667,449 | 3.28 |
| 2026-07-15 | 1,725,825 | -1.0% | 651,751 | 2.65 |
| 2026-06-30 | 1,743,400 | +23.3% | 1,072,800 | 1.63 |
| 2026-06-15 | 1,413,626 | -8.4% | 566,886 | 2.49 |
| 2026-05-29 | 1,542,734 | -1.3% | 577,315 | 2.67 |
| 2026-05-15 | 1,562,321 | -1.3% | 1,589,397 | 1.00 |
| 2026-04-30 | 1,582,776 | -21.9% | 510,826 | 3.10 |
| 2026-04-15 | 2,026,917 | +24.5% | 348,526 | 5.82 |
| 2026-03-31 | 1,627,846 | +12.6% | 290,129 | 5.61 |
| 2026-03-13 | 1,445,166 | +29.6% | 1,058,793 | 1.36 |
| 2026-02-27 | 1,114,977 | +28.1% | 393,625 | 2.83 |
| 2026-02-13 | 870,715 | -5.8% | 374,307 | 2.33 |
| 2026-01-30 | 923,973 | +89.3% | 751,870 | 1.23 |
| 2026-01-15 | 488,204 | +1.8% | 499,122 | 1.00 |
| 2025-12-31 | 479,829 | -14.5% | 402,430 | 1.19 |
| 2025-12-15 | 561,306 | -19.2% | 436,647 | 1.29 |
| 2025-11-28 | 694,329 | -45.3% | 558,008 | 1.24 |
| 2025-11-14 | 1,270,373 | +8.0% | 802,130 | 1.58 |
| 2025-10-31 | 1,175,794 | -55.9% | 4,549,081 | 1.00 |
| 2025-10-15 | 2,666,759 | +152.2% | 45,018,653 | 1.00 |
| 2025-09-30 | 1,057,254 | +5.2% | 325,975 | 3.24 |
| 2025-09-15 | 1,004,854 | -3.3% | 126,127 | 7.97 |
| 2025-08-29 | 1,038,884 | +10.3% | 136,911 | 7.59 |
| 2025-08-15 | 942,214 | +3.7% | 219,520 | 4.29 |
| 2025-07-31 | 908,333 | -12.1% | 675,222 | 1.35 |
| 2025-07-15 | 1,033,813 | +8.2% | 286,686 | 3.61 |
| 2025-06-30 | 955,605 | -2.9% | 339,589 | 2.81 |
| 2025-06-13 | 984,414 | +51.4% | 392,396 | 2.51 |
| 2025-05-30 | 650,118 | +19.8% | 4,142,616 | 1.00 |
| 2025-05-15 | 542,489 | +18.7% | 80,734 | 6.72 |
| 2025-04-30 | 457,086 | +19.7% | 37,531 | 12.18 |
| 2025-04-15 | 381,954 | -0.3% | 63,637 | 6.00 |
| 2025-03-31 | 382,933 | +7.4% | 39,432 | 9.71 |
| 2025-03-14 | 356,518 | -17.5% | 66,348 | 5.37 |
| 2025-02-28 | 432,331 | +15.8% | 129,219 | 3.35 |
| 2025-02-14 | 373,223 | -7.9% | 73,166 | 5.10 |
| 2025-01-31 | 405,112 | +1.1% | 67,897 | 5.97 |
| 2025-01-15 | 400,794 | +4.3% | 65,877 | 6.08 |
| 2024-12-31 | 384,126 | +8.3% | 107,203 | 3.58 |
| 2024-12-13 | 354,728 | -15.3% | 78,411 | 4.52 |
| 2024-11-29 | 418,863 | +20.3% | 108,921 | 3.85 |
| 2024-11-15 | 348,176 | -27.9% | 141,803 | 2.46 |
| 2024-10-31 | 483,079 | -0.5% | 76,973 | 6.28 |
| 2024-10-15 | 485,666 | +8.3% | 52,325 | 9.28 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 1 October 2026, the short share of GWH volume is 49.8%, down 11.0 points over the last five sessions. Over the last 30 readings it ranged from 26.5% (3 September 2026) to 67.3% (2 September 2026). The latest reading is 4.9 points below the 30-session average of 54.7%, on 1.0M shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-01 | 508K | 1.0M | 49.8% | 41,050 |
| 2026-09-30 | 270K | 568K | 47.6% | 200 |
| 2026-09-29 | 301K | 481K | 62.6% | 61,154 |
| 2026-09-28 | 632K | 1.3M | 48.9% | 66,213 |
| 2026-09-25 | 2.6M | 4.4M | 59.3% | 329,138 |
| 2026-09-24 | 163K | 267K | 60.9% | 13,502 |
| 2026-09-23 | 185K | 306K | 60.3% | 2,000 |
| 2026-09-22 | 505K | 913K | 55.3% | 33,160 |
| 2026-09-21 | 237K | 374K | 63.5% | 2,654 |
| 2026-09-18 | 185K | 321K | 57.5% | 0 |
| 2026-09-17 | 190K | 349K | 54.4% | 50 |
| 2026-09-16 | 73K | 137K | 53.1% | 0 |
| 2026-09-15 | 94K | 184K | 51.3% | 0 |
| 2026-09-14 | 160K | 326K | 49.3% | 0 |
| 2026-09-11 | 97K | 178K | 54.5% | 0 |
| 2026-09-10 | 143K | 265K | 54.0% | 0 |
| 2026-09-09 | 458K | 795K | 57.6% | 0 |
| 2026-09-08 | 785K | 1.2M | 65.5% | 7,912 |
| 2026-09-04 | 243K | 457K | 53.2% | 0 |
| 2026-09-03 | 144K | 543K | 26.5% | 20 |
| 2026-09-02 | 563K | 837K | 67.3% | 200 |
| 2026-09-01 | 170K | 296K | 57.6% | 0 |
| 2026-08-31 | 341K | 551K | 61.8% | 4,900 |
| 2026-08-28 | 123K | 291K | 42.2% | 0 |
| 2026-08-27 | 393K | 656K | 59.9% | 0 |
| 2026-08-26 | 311K | 490K | 63.4% | 0 |
| 2026-08-25 | 137K | 341K | 40.2% | 200 |
| 2026-08-24 | 443K | 803K | 55.2% | 18,401 |
| 2026-08-21 | 833K | 1.5M | 56.8% | 62,658 |
| 2026-08-20 | 1.2M | 2.4M | 51.4% | 166,182 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 30 September 2026, the fails-to-deliver balance in GWH is 73,374 shares, up 17,776 shares over the last settlement date. Over the last 30 readings it ranged from 515 shares (6 July 2026) to 239,957 shares (7 August 2026).
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-30 | 73,374 | $0.18 | $13K |
| 2026-09-29 | 55,598 | $0.18 | $10K |
| 2026-09-28 | 100,101 | $0.21 | $21K |
| 2026-09-24 | 16,427 | $0.37 | $6K |
| 2026-09-23 | 35,961 | $0.39 | $14K |
| 2026-09-22 | 5,214 | $0.37 | $2K |
| 2026-09-21 | 42,402 | $0.36 | $15K |
| 2026-09-18 | 47,408 | $0.36 | $17K |
| 2026-09-10 | 14,443 | $0.38 | $5K |
| 2026-09-09 | 26,231 | $0.39 | $10K |
| 2026-09-08 | 27,372 | $0.34 | $9K |
| 2026-09-03 | 9,610 | $0.33 | $3K |
| 2026-08-24 | 8,795 | $0.40 | $4K |
| 2026-08-21 | 11,279 | $0.39 | $4K |
| 2026-08-20 | 7,180 | $0.69 | $5K |
| 2026-08-19 | 8,356 | $0.66 | $6K |
| 2026-08-18 | 15,259 | $0.61 | $9K |
| 2026-08-12 | 207,589 | $0.65 | $135K |
| 2026-08-07 | 239,957 | $0.68 | $163K |
| 2026-08-06 | 9,117 | $0.73 | $7K |
| 2026-08-04 | 2,503 | $0.72 | $2K |
| 2026-07-30 | 24,374 | $0.71 | $17K |
| 2026-07-23 | 5,408 | $0.89 | $5K |
| 2026-07-21 | 2,373 | $0.84 | $2K |
| 2026-07-17 | 865 | $0.89 | $770 |
| 2026-07-15 | 899 | $0.87 | $782 |
| 2026-07-13 | 34,516 | $0.85 | $29K |
| 2026-07-06 | 515 | $0.86 | $443 |
| 2026-07-02 | 3,282 | $0.91 | $3K |
| 2026-07-01 | 1,229 | $0.95 | $1K |
Insider trades
SEC Form 4, newest first. JSONInsiders at GWH reported 2 open-market sells worth $4K in the last 90 days and no open-market buys. Latest filing: Suhadolnik Kate Eileen (Chief Financial Officer) on 2026-08-21.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-08-21 | Suhadolnik Kate Eileen | Chief Financial Officer | Sell | 4K | $0.40 | $2K | 157K |
| 2026-08-21 | Goodman Kelly F. | SEE REMARKS | Sell | 5K | $0.40 | $2K | 205K |
| 2026-06-04 | Buckley Drew P | CEO | Buy | 25K | $1.03 | $26K | 25K |
| 2026-05-29 | Hossfeld Rich | Director | Grant | 14K | $0.00 | $0 | 41K |
| 2026-05-29 | WELLMAN ALEXI | Director | Grant | 14K | $0.00 | $0 | 52K |
| 2026-05-29 | Quarls Harry | Director | Grant | 14K | $0.00 | $0 | 69K |
| 2026-05-29 | Garabedian Raffi | Director | Grant | 14K | $0.00 | $0 | 53K |
| 2026-05-29 | Nijhawan Sandeep | Director | Grant | 14K | $0.00 | $0 | 43K |
| 2026-05-22 | Suhadolnik Kate Eileen | Chief Financial Officer | Sell | 2K | $0.93 | $2K | 161K |
| 2026-05-22 | Goodman Kelly F. | SEE REMARKS | Sell | 3K | $0.93 | $3K | 211K |
| 2026-05-21 | Suhadolnik Kate Eileen | Chief Financial Officer | Sell | 2K | $0.92 | $2K | 163K |
| 2026-05-21 | Goodman Kelly F. | SEE REMARKS | Sell | 2K | $0.92 | $2K | 213K |
| 2026-02-20 | Suhadolnik Kate Eileen | Chief Financial Officer | Sell | 741 | $1.54 | $1K | 164K |
| 2026-02-20 | Goodman Kelly F. | SEE REMARKS | Sell | 2K | $1.54 | $3K | 216K |
| 2026-02-13 | Suhadolnik Kate Eileen | Chief Financial Officer | Grant | 138K | $0.00 | $0 | 165K |
| 2026-02-13 | Goodman Kelly F. | SEE REMARKS | Grant | 138K | $0.00 | $0 | 218K |
| 2025-11-20 | Suhadolnik Kate Eileen | Interim CFO | Tax withholding | 1K | $2.40 | $3K | 28K |
| 2025-11-20 | Goodman Kelly F. | Interim CEO | Tax withholding | 5K | $2.40 | $11K | 81K |
| 2025-10-13 | Hossfeld Rich | Director | Grant | 14K | $0.00 | $0 | 28K |
| 2025-10-13 | Teamey Kyle | Director | Grant | 14K | $0.00 | $0 | 39K |
| 2025-10-13 | WELLMAN ALEXI | Director | Grant | 14K | $0.00 | $0 | 39K |
| 2025-10-13 | Quarls Harry | Director | Grant | 14K | $0.00 | $0 | 14K |
| 2025-10-13 | Garabedian Raffi | Director | Grant | 14K | $0.00 | $0 | 40K |
| 2025-10-13 | Nijhawan Sandeep | Director | Grant | 14K | $0.00 | $0 | 29K |
| 2025-10-13 | NIGGLI MICHAEL R | Director | Grant | 14K | $0.00 | $0 | 91K |
| 2025-08-20 | Goodman Kelly F. | Interim CEO | Tax withholding | 4K | $1.61 | $7K | 85K |
| 2025-08-20 | Suhadolnik Kate Eileen | Interim CFO | Tax withholding | 1K | $1.61 | $2K | 29K |
| 2025-08-18 | Trivedi Jigish Dhirajlal | COO | Grant | 275K | $0.00 | $0 | 275K |
| 2025-05-20 | Rabb Anthony | Chief Financial Officer | Tax withholding | 3K | $1.96 | $5K | 109K |
| 2025-05-20 | Goodman Kelly F. | Interim CEO | Tax withholding | 2K | $1.96 | $4K | 89K |
| 2025-04-13 | Goodman Kelly F. | Interim CEO | Grant | 37K | $0.00 | $0 | 92K |
| 2025-04-13 | Rabb Anthony | Chief Financial Officer | Grant | 43K | $0.00 | $0 | 112K |
| 2025-02-20 | Goodman Kelly F. | Interim CEO | Tax withholding | 1K | $4.81 | $7K | 55K |
| 2025-02-20 | Rabb Anthony | Chief Financial Officer | Tax withholding | 2K | $4.81 | $10K | 70K |
| 2025-02-10 | Goodman Kelly F. | Interim CEO | Grant | 10K | $0.00 | $0 | 56K |
| 2024-11-20 | Rabb Anthony | Chief Financial Officer | Tax withholding | 2K | $5.21 | $10K | 72K |
| 2024-11-18 | Dresselhuys Eric P. | Chief Executive Officer | Buy | 1K | $5.23 | $5K | 181K |
| 2024-09-11 | Nijhawan Sandeep | Director | Sell | 7K | $5.72 | $40K | 16K |
| 2024-08-30 | Teamey Kyle | Director | Buy | 142 | $6.73 | $956 | 25K |
| 2024-08-29 | NIGGLI MICHAEL R | Director | Exercise or conversion | 12K | $6.88 | $82K | 77K |
| 2024-08-20 | Rabb Anthony | Chief Financial Officer | Tax withholding | 2K | $8.19 | $15K | 74K |
| 2024-05-20 | Rabb Anthony | Chief Financial Officer | Tax withholding | 2K | $12.15 | $23K | 75K |
| 2024-05-17 | WELLMAN ALEXI | Director | Grant | 203K | $0.00 | $0 | 381K |
| 2024-05-17 | Teamey Kyle | Director | Grant | 203K | $0.00 | $0 | 376K |
| 2024-05-17 | Quarls Harry | Director | Grant | 203K | $0.00 | $0 | 626K |
| 2024-05-17 | Nijhawan Sandeep | Director | Grant | 203K | $0.00 | $0 | 338K |
| 2024-05-17 | NIGGLI MICHAEL R | Director | Grant | 203K | $0.00 | $0 | 952K |
| 2024-05-17 | Garabedian Raffi | Director | Grant | 203K | $0.00 | $0 | 392K |
| 2024-05-17 | Hossfeld Rich | Director | Grant | 203K | $0.00 | $0 | 215K |
| 2024-05-15 | Hossfeld Rich | Director | Returned to company | 135K | $0.00 | $0 | 13K |
| 2024-05-14 | Teamey Kyle | Director | Buy | 1K | $0.79 | $988 | 174K |
| 2024-05-10 | Quarls Harry | Director | Buy | 57K | $0.79 | $45K | 423K |
| 2024-05-09 | Quarls Harry | Director | Buy | 43K | $0.84 | $36K | 366K |
| 2024-03-15 | Hossfeld Rich | Director | Buy | 2K | $0.73 | $2K | 148K |
| 2024-03-15 | Hossfeld Rich | Director | Buy | 200 | $0.73 | $146 | 146K |
| 2024-03-07 | Dresselhuys Eric P. | Chief Executive Officer | Grant | 623K | $0.00 | $0 | 2.7M |
| 2024-02-20 | Rabb Anthony | Chief Financial Officer | Tax withholding | 1K | $13.67 | $14K | 77K |
| 2024-02-15 | Rabb Anthony | Chief Financial Officer | Grant | 550K | $0.00 | $0 | 1.2M |
| 2023-11-20 | Rabb Anthony | Chief Financial Officer | Tax withholding | 4K | $17.55 | $75K | 78K |
| 2023-11-16 | Quarls Harry | Director | Buy | 5K | $1.25 | $7K | 323K |
| 2023-11-15 | Quarls Harry | Director | Buy | 67K | $1.35 | $91K | 318K |
| 2023-11-14 | Quarls Harry | Director | Buy | 81K | $1.27 | $102K | 251K |
| 2023-11-13 | Teamey Kyle | Director | Buy | 1K | $1.11 | $1K | 172K |
| 2023-11-13 | Quarls Harry | Director | Buy | 47K | $1.10 | $51K | 170K |
| 2023-09-05 | Dresselhuys Eric P. | Chief Executive Officer | Grant | 129K | $0.00 | $0 | 2.1M |
| 2023-08-28 | Quarls Harry | Director | Grant | 123K | $0.00 | $0 | 123K |
| 2023-08-20 | Rabb Anthony | Chief Financial Officer | Tax withholding | 106 | $18.15 | $2K | 83K |
| 2023-05-20 | Rabb Anthony | Chief Financial Officer | Tax withholding | 100 | $18.00 | $2K | 83K |
| 2023-05-19 | Hossfeld Rich | Director | Grant | 135K | $0.00 | $0 | 145K |
| 2023-05-19 | WELLMAN ALEXI | Director | Grant | 135K | $0.00 | $0 | 178K |
| 2023-05-19 | Teamey Kyle | Director | Grant | 135K | $0.00 | $0 | 171K |
| 2023-05-19 | NIGGLI MICHAEL R | Director | Grant | 135K | $0.00 | $0 | 749K |
| 2023-05-19 | Garabedian Raffi | Director | Grant | 135K | $0.00 | $0 | 190K |
| 2023-05-19 | Nijhawan Sandeep | Director | Grant | 135K | $0.00 | $0 | 135K |
| 2023-05-16 | Hossfeld Rich | Director | Buy | 10K | $0.81 | $8K | 10K |
| 2023-05-16 | NIGGLI MICHAEL R | Director | Buy | 10K | $0.81 | $8K | 614K |
| 2023-05-15 | Teamey Kyle | Director | Buy | 100 | $0.84 | $84 | 36K |
| 2023-05-15 | Teamey Kyle | Director | Buy | 4K | $0.84 | $3K | 36K |
| 2023-05-12 | NIGGLI MICHAEL R | Director | Buy | 20K | $1.13 | $23K | 604K |
| 2023-04-26 | Dresselhuys Eric P. | Chief Executive Officer | Grant | 623K | $0.00 | $0 | 2.0M |
| 2023-03-13 | Rabb Anthony | Chief Financial Officer | Grant | 76K | $0.00 | $0 | 692K |
| 2023-03-13 | Rabb Anthony | Chief Financial Officer | Grant | 78K | $0.00 | $0 | 694K |
| 2023-03-13 | Evans Craig E | President | Grant | 468K | $0.00 | $0 | 2.9M |
| 2023-03-07 | Teamey Kyle | Director | Buy | 3K | $1.61 | $4K | 32K |
| 2023-03-06 | NIGGLI MICHAEL R | Director | Buy | 5K | $1.65 | $8K | 584K |
| 2023-02-21 | Evans Craig E | President | Sell | 6K | $2.04 | $11K | 5.6M |
| 2023-02-21 | Evans Craig E | President | Sell | 5K | $0.00 | $0 | 2.4M |
| 2023-02-21 | Dresselhuys Eric P. | Chief Executive Officer | Sell | 23K | $2.04 | $48K | 1.3M |
| 2022-12-15 | NIGGLI MICHAEL R | Director | Buy | 19K | $2.56 | $49K | 579K |
| 2022-11-21 | Evans Craig E | President | Sell | 50K | $3.52 | $176K | 5.6M |
| 2022-11-21 | Evans Craig E | President | Sell | 6K | $3.82 | $24K | 2.4M |
| 2022-11-21 | Evans Craig E | President | Sell | 8K | $3.82 | $31K | 5.6M |
| 2022-11-21 | Dresselhuys Eric P. | Chief Executive Officer | Sell | 14K | $3.82 | $55K | 1.4M |
| 2022-11-18 | Evans Craig E | President | Sell | 50K | $3.93 | $197K | 2.4M |
| 2022-10-19 | Moftakhar Amir | Chief Financial Officer | Sell | 4K | $3.48 | $15K | 563K |
| 2022-10-19 | Moftakhar Amir | Chief Financial Officer | Sell | 4K | $3.48 | $15K | 559K |
| 2022-10-17 | Dresselhuys Eric P. | Chief Executive Officer | Sell | 19K | $3.72 | $72K | 1.4M |
| 2022-10-17 | Moftakhar Amir | Chief Financial Officer | Sell | 63K | $4.03 | $255K | 584K |
| 2022-10-17 | Moftakhar Amir | Chief Financial Officer | Sell | 17K | $3.72 | $62K | 567K |
| 2022-10-17 | Dresselhuys Eric P. | Chief Executive Officer | Sell | 19K | $3.72 | $72K | 1.4M |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
Planned sales (Form 144)
Newest first. JSON2 Form 144 notices on file for GWH worth $11K at the prices reported; 0 in the last 90 days worth $0. Latest: ANTHONY A RABB filed on 2025-09-25 to sell 3,878 shares ($7K) from 2025-09-25.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2025-09-25 | ANTHONY A RABBOfficer | 4K | $7K | 0.027% | 2025-09-25 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-09-17 | ANTHONY A RABBOfficer | 3K | $5K | 0.021% | 2025-09-17 | Morgan Stanley Smith Barney LLC Executive Financial Services |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON3 holders report 5% or more of GWH in their latest filing, all on Schedule 13G (passive). The largest reported stake is Ayrton Capital LLC at 8.1% of the class (2,563,934 shares), filed 2026-08-13 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-14 | 13G/Ano. 2 | Alyeska Investment Group, L.P.investment adviser | 1.4M | 4.8% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 2 | Alyeska Fund GP, LLCother entity | 1.4M | 4.8% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 2 | Anand Parekhindividual | 1.4M | 4.8% | 2026-06-30 |
| 2026-08-13 | 13G/Ano. 1 | Ayrton Capital LLCinvestment adviser | 2.6M | 8.1% | 2026-06-30 |
| 2026-08-13 | 13G/Ano. 1 | Alto Opportunity Master Fund, SPC - Segregated Master Portfolio Bcorporation | 2.6M | 8.1% | 2026-06-30 |
| 2026-08-13 | 13G/Ano. 1 | Waqas Khatriindividual | 2.6M | 8.1% | 2026-06-30 |
13F holders
Tracked managers holding GWH at their latest 13F. JSON1 of the 30 tracked managers held GWH at their latest 13F, $12K in total at quarter-end prices. Renaissance Technologies is the largest at $12K (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 0 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Renaissance Technologies | 2026-06-30 | 13K | $12K | 0.00% | new |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
What this page is
ESS Tech in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows ESS Tech (GWH), SEC CIK 1819438, listed on NYSE, classified by the SEC as miscellaneous electrical machinery, equipment & supplies. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-01.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-30.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2025-09-25.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-08-14.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-11.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-08-21.JSON and CSV
- Company record
- EDGAR filing index for CIK 1819438Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
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Datasets
Frequently Asked Questions
How much of GWH is sold short?
2,145,222 shares were held short at the 2026-09-30 settlement, 1.3 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is GWH's daily short volume?
On 2026-10-01, 507,596 of the 1,018,533 GWH shares reported to FINRA were sold short, 49.8% of the day's reported volume. Short volume is a flow for one day, not a position.
Does GWH have fails to deliver?
The SEC's latest file shows 73,374 GWH shares failed to deliver at settlement 2026-09-30. Fails are reported per settlement date and published twice a month with a lag.
Are GWH insiders buying or selling?
Insiders at GWH reported 2 open-market sells worth $4K in the last 90 days and no open-market buys. Latest filing: Suhadolnik Kate Eileen (Chief Financial Officer) on 2026-08-21.
Have GWH insiders filed to sell?
2 Form 144 notices on file for GWH worth $11K at the prices reported; 0 in the last 90 days worth $0. Latest: ANTHONY A RABB filed on 2025-09-25 to sell 3,878 shares ($7K) from 2025-09-25.
Who owns 5% or more of GWH?
3 holders report 5% or more of GWH in their latest filing, all on Schedule 13G (passive). The largest reported stake is Ayrton Capital LLC at 8.1% of the class (2,563,934 shares), filed 2026-08-13 for an event on 2026-06-30.
Which tracked 13F managers own GWH?
1 of the 30 tracked 13F managers held GWH shares at their latest filing, $12K in all. The largest: Renaissance Technologies (13K shares, $12K).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.