Entity type
Company
Filer Snapshot
ESS Tech, Inc.
CIK 0001819438. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.
Total filings
112
Latest filing
26 May 2026
Industry
Miscellaneous Electrical Machinery, Equipment and Supplies
Filing-backed research brief
Start with the SEC data that changes for this CIK
Latest signal: SEC filing timeline only. Each card links back to the PortfolioSavvy page where the filing evidence is closest.
Latest 13F portfolio
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No parsed 13F portfolio row yet.
Browse latest 13FLargest parsed holding
—
Populates from the latest parsed 13F information table.
Open holding13D/G large stake
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No recent parsed 13D/G stake row for this CIK.
Browse 13D/GInsider / owner context
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No parsed Forms 3/4/5 owner position for this CIK.
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Source: SEC Forms 3/4/5
View Source Filing
4 filed on 26 May 2026 for CIK 0001819438.
- Ticker symbols
- GWH, GWH-WT on NYSE
- Business address
- 26440 Sw Parkway Ave., Bldg. 83, Wilsonville, OR, 97070
- State of incorporation
- DE
- Fiscal year-end
- 31 December
- Former SEC names
- ACON S2 Acquisition Corp. (to 08 Oct 2021)
Identity
2 identity fields
SEC profile 3 profile fields
Filer intelligence
What SEC filings say about ESS Tech, Inc.
A compact read of parsed XML filings. 13F, 13D/G, and Forms 3/4/5 are shown separately because they answer different ownership questions.
SEC source mix
Counts show available parsed rows, not one combined ownership total.
13F portfolio
No rows yet
Quarterly institutional portfolio holdings.
13D/G stakes
No rows yet
Beneficial ownership and large-stake disclosures.
Forms 3/4/5
No rows yet
Officer, director, and 10% owner holdings or transactions.
No parsed ownership summary yet
We still show the SEC filing timeline below. The intelligence summary will populate when parsed 13F, 13D/G, or Forms 3/4/5 data exists for this CIK.
Latest update
What changed recently for ESS Tech, Inc.
Latest financial period: Q1 2026. Open the source-backed page to inspect the fresh filing or facts context.
Update date
07 May 2026
Page type
Company facts
Latest period
Q1 2026
SEC-backed company facts were refreshed from filings filed on 07 May 2026.
Benchmark Context
Benchmark context for this company
ESS Tech, Inc. has a source-backed company facts view where you can compare the latest reported metrics with its own recent history and with peer rankings for the same metric.
Compared with
Start on the facts page for period-to-period context, then open a metric ranking when you want to compare the same reported fact across other SEC-reporting companies.
Why this is notable
Latest financial period: Q1 2026. That gives you a fresh baseline before you compare this company with peers.
- Latest company facts filing date: 07 May 2026.
- Peer comparisons stay conservative: same metric, compatible units, latest valid company row only.
- Open the facts page first if you want the cleanest path to verification.
Benchmark context is only shown where the app has enough comparable SEC-backed data to keep the interpretation honest.
SEC filing record
CIK 0001819438 filing coverage
Start with this filing record, then use the linked ownership pages when parsed 13F, 13D/G, Forms 3/4/5, or facts data exists for this CIK.
SEC filings
112
First seen
13 Oct 2021
Latest filing
26 May 2026
Entity
Company
Observed form types
10-K
10-Q
3
3/A
4
4/A
CIK-linked evidence first
Industry context: Miscellaneous Electrical Machinery, Equipment and Supplies.
Latest Filings
Showing the latest 12 of 112 SEC filings for ESS Tech, Inc..
4
4 filing
- Filing date
- 26 May 2026
- Reporting date
- 21 May 2026
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
4
4 filing
- Filing date
- 26 May 2026
- Reporting date
- 21 May 2026
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
10-Q
10-Q filing
- Filing date
- 07 May 2026
- Reporting date
- 31 Mar 2026
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
10-K
10-K filing
- Filing date
- 05 Mar 2026
- Reporting date
- 31 Dec 2025
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
4
4 filing
- Filing date
- 26 Feb 2026
- Reporting date
- 20 Feb 2026
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
4
4 filing
- Filing date
- 26 Feb 2026
- Reporting date
- 20 Feb 2026
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
4
4 filing
- Filing date
- 26 Feb 2026
- Reporting date
- 13 Feb 2026
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
4
4 filing
- Filing date
- 26 Feb 2026
- Reporting date
- 13 Feb 2026
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
4
4 filing
- Filing date
- 29 Jan 2026
- Reporting date
- 28 Jan 2026
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
3
3 filing
- Filing date
- 29 Jan 2026
- Reporting date
- 01 Jan 2026
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
4
4 filing
- Filing date
- 21 Nov 2025
- Reporting date
- 20 Nov 2025
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
4
4 filing
- Filing date
- 21 Nov 2025
- Reporting date
- 20 Nov 2025
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing