ESS Tech, Inc. - Common Stock, $0.0001 par value per share (GWH) Institutional Ownership

13F Institutional Holders and Ownership History from Q2 2024 to Q4 2025

Type / Class
Equity / Common Stock, $0.0001 par value per share
Symbol
GWH on NYSE
Shares outstanding
19,607,843
Price per share
$1.71
All holders as of 31 Dec 2025
Q4 2025
Total 13F shares
6,356,128
Total reported value
$11,948,987
% of total 13F portfolios
0%
Share change
+2,610,857
Value change
+$4,943,139
Number of holders
53
Price from insider filings
$1.71
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of ESS Tech, Inc. - Common Stock, $0.0001 par value per share (GWH) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
SOFTBANK GROUP CORP. 20% $5,465,114 2,396,980 SB Energy Global Holdings One Ltd. 23 Aug 2024
Alyeska Investment Group, L.P. 7.1% $2,632,000 1,400,000 Alyeska Investment Group, L.P. 31 Dec 2025

As of 31 Dec 2025, 53 institutional investors reported holding 6,356,128 shares of ESS Tech, Inc. - Common Stock, $0.0001 par value per share (GWH). This represents 32% of the company’s total 19,607,843 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of ESS Tech, Inc. - Common Stock, $0.0001 par value per share (GWH) together control 32% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
SOFTBANK GROUP CORP. 12% 2,396,980 0% 0.03% $4,506,322
Alyeska Investment Group, L.P. 7.1% 1,400,000 0.01% $2,632,000
Arosa Capital Management LP 4.8% 950,000 +41% 1.1% $1,786,000
VANGUARD GROUP INC 2.5% 485,919 +84% 0% $913,527
Shay Capital LLC 0.92% 180,000 0.05% $338,400
GEODE CAPITAL MANAGEMENT, LLC 0.7% 136,470 +140% 0% $256,585
Green Alpha Advisors, LLC 0.61% 118,683 +1017% 0.2% $223,124
JANE STREET GROUP, LLC 0.56% 109,012 +123% 0% $204,943
Pathstone Holdings, LLC 0.45% 88,982 0% $167,286
GSA CAPITAL PARTNERS LLP 0.38% 74,724 0.01% $140,000
JPMORGAN CHASE & CO 0.38% 74,259 +43582% 0% $139,607
FMR LLC 0.27% 52,486 +0% 0% $98,674
BlackRock, Inc. 0.26% 50,370 -5.2% 0% $94,696
XTX Topco Ltd 0.25% 49,609 +138% 0% $93,265
STATE STREET CORP 0.24% 46,975 +188% 0% $88,313
UBS Group AG 0.23% 44,717 +201% 0% $84,068
Engineers Gate Manager LP 0.08% 16,498 0% $31,016
LPL Financial LLC 0.07% 14,237 0% $26,766
NORTHERN TRUST CORP 0.05% 10,588 0% 0% $19,905
MILLENNIUM MANAGEMENT LLC 0.05% 10,111 0% $19,009
BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.05% 10,000 0% $18,800
PRIMORIS WEALTH ADVISORS, LLC 0.05% 10,000 0.01% $18,800
OSAIC HOLDINGS, INC. 0.03% 6,106 +170% 0% $11,478
Golden State Wealth Management, LLC 0.01% 2,707 -0.48% 0% $5,090
BANK OF AMERICA CORP /DE/ 0.01% 2,703 +5.9% 0% $5,082

Institutional Holders of ESS Tech, Inc. - Common Stock, $0.0001 par value per share (GWH) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 6,356,128 $11,948,987 +$4,943,139 $1.88 53
2025 Q3 3,745,456 $5,692,877 +$1,124,974 $1.52 44
2025 Q2 3,020,491 $4,017,443 -$1,213,323 $1.33 46
2025 Q1 3,367,144 $10,976,191 -$499,358 $3.26 43
2024 Q4 3,480,802 $20,467,183 +$1,215,383 $5.88 53
2024 Q3 3,268,537 $20,657,023 +$20,170,949 $6.32 45
2024 Q2 23,400 $19,139 +$19,139 $0.82 1