ESS Tech GWH Institutional Ownership

NYSE GWH

$0.37 -0.01 (-1.65%)

As of: Sep 10, 2026 · 3:59 PM EDT

Institutions by Trading Activity

48 Institutions

Increased 20 41.7%

Unchanged 20 41.7%

Reduced 8 16.7%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

21.59%

▼-4.39 pp QoQ

Shares Held by Institutions

7.30Mn

of 33.82Mn outstanding

▼-3.21% QoQ

Shares Outstanding

33.82Mn

26.52Mn held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

▼-3 vs prior quarter

Net Shares Added (QoQ)

-242.50K

distributed since last quarter

Value of Holdings

$2.48Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

ESS Tech, Inc. (NYSE:GWH) is held by 48 institutional investors per 13F filings through June 2026.

Collectively, these holders controlled 21.6% of ESS Tech's outstanding shares in June 2026, down from 26.0% in March 2026.
Their total shares held in GWH decreased -3.21% from the prior quarter, while the number of investors in ESS Tech decreased 2.04% year over year.
Of these 48 funds, 20 grew their exposure to ESS Tech, 8 cut back, and 20 maintained positions.
Institutional investors collectively held 7.3Mn shares in ESS Tech as of June 2026, down by 242.5K shares quarter on quarter, and up 4.28Mn shares year over year.
As of June 30, 2026, Softbank Group Corp. held the largest stake in ESS Tech with 2.4Mn shares, accounting for 7.09% of total shares outstanding.
Top purchasers of GWH stock for the quarter ending June 2026 included UBS Group AG (453.33K), BlackRock, Inc. (83.5K), VANGUARD FIDUCIARY TRUST CO (60.48K), Shay Capital LLC (30.15K), PKS Advisory Services, LLC (24.0K).
The largest sellers of ESS Tech for the quarter ending June 2026 were HEIGHTS CAPITAL MANAGEMENT, INC (414.87K), Arosa Capital Management LP (360.0K), GSA CAPITAL PARTNERS LLP (134.53K), GEODE CAPITAL MANAGEMENT, LLC (13.52K), Jpmorgan Chase & Co (11.64K).
Business Quant data shows the 10 biggest positions in ESS Tech as of June 2026 are held by Softbank Group Corp. (2.4Mn), Alyeska Investment Group, L.P. (1.4Mn), VANGUARD CAPITAL MANAGEMENT LLC (638.92K), UBS Group AG (602.61K), Arosa Capital Management LP (550.0K), HEIGHTS CAPITAL MANAGEMENT, INC (548.62K), Shay Capital LLC (210.15K), GEODE CAPITAL MANAGEMENT, LLC (210.04K), BlackRock, Inc. (133.87K), VANGUARD FIDUCIARY TRUST CO (129.88K).

Form 13F Holdings

48 Institutional Holders

Report period 30 Jun, 2026

Total shares held 7.30Mn

Of outstanding 21.59%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	Softbank Group Corp.	0001065521	2,396,980	7.09%	0	0.00%	$2.28Mn
2	Alyeska Investment Group, L.P.	0001453072	1,400,000	4.14%	0	0.00%	$1.33Mn
3	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	638,920	1.89%	▲4,200	+0.66%	$606.97K
4	UBS Group AG	0001610520	602,607	1.78%	▲453,328	+303.68%	$572.48K
5	Arosa Capital Management LP	0001596053	550,000	1.63%	▼360,000	-39.56%	$522.50K
6	HEIGHTS CAPITAL MANAGEMENT, INC	0001081698	548,621	1.62%	▼414,874	-43.06%	$521.19K
7	Shay Capital LLC	0001723643	210,146	0.62%	▲30,146	+16.75%	$199.64K
8	GEODE CAPITAL MANAGEMENT, LLC	0001214717	210,037	0.62%	▼13,524	-6.05%	$199.55K
9	BlackRock, Inc.	0002012383	133,867	0.40%	▲83,497	+165.77%	$127.17K
10	VANGUARD FIDUCIARY TRUST CO	0000933478	129,877	0.38%	▲60,475	+87.14%	$123.38K
11	Green Alpha Advisors, LLC	0001439207	115,775	0.34%	▲1,195	+1.04%	$109.99K
12	Pathstone Holdings, LLC	0002011612	88,982	0.26%	▲1,534	+1.75%	$85.07K
13	FMR LLC	0000315066	52,485	0.16%	▼4	-0.01%	$49.86K
14	Northern Trust Corp	0000073124	47,532	0.14%	▲16,193	+51.67%	$45.16K
15	State Street Corp	0000093751	46,975	0.14%	0	0.00%	$44.63K
16	PKS Advisory Services, LLC	0001605401	24,000	0.07%	▲24,000	0.00%	$22.80K
17	BRIDGEWAY CAPITAL MANAGEMENT, LLC	0001107261	20,000	0.06%	0	0.00%	$19.00K
18	Jpmorgan Chase & Co	0000019617	19,896	0.06%	▼11,640	-36.91%	$19.62K
19	PRIMORIS WEALTH ADVISORS, LLC	0001909619	16,500	0.05%	0	0.00%	$15.68K
20	RENAISSANCE TECHNOLOGIES LLC	0001037389	12,700	0.04%	▲12,700	0.00%	$12.07K

Showing 1 to 20 of 48 holders