ESS Tech, Inc. (GWH)
GWH moved a median of -1.13% 30 minutes after news, and -2.27% by the close. How GWH actually reacts to news — the realized, point-in-time move the market made, measured across 258 labeled events over the last three years with zero look-ahead.
GWH’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -0.01% | 43% | 256 |
| 30-min | -1.13% | 38% | 258 |
| 60-min | -0.79% | 43% | 258 |
| to close | -2.27% | 32% | 256 |
| Middle 50% of GWH reactions | -4.24% to +1.12% |
|---|---|
| Median reaction (30-min) | -1.13% |
| Measured reactions | 258 |
Half of all ESS Tech, Inc. news events land between -4.24% and +1.12% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How GWH reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst downgrades | 16 | -2.02% | 31% | -1.21% |
| Rating reiterations | 16 | +0.22% | 56% | -2.15% |
| Price-target cuts | 10 | -0.11% | 40% | -1.44% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. 2 further classes were observed with fewer than 10 measured events and are not published. See how GWH ranks against every other measured name →
That’s how GWH usually reacts — get an email when it moves on news →Email me when GWH moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to GWH's baseline. Nothing else.
Recent GWH events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 8-K ESS Tech, Inc. For: Oct 02 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K ESS Tech, Inc. For: Sep 24 | SEC filing · Form 8-K | SEC EDGAR | -5.40% | -4.97% | |
| Form DEF 14A ESS Tech, Inc. For: Sep 24 | SEC filing · Form DEF | SEC EDGAR | -6.56% | -37.69% | |
| Form EFFECT ESS Tech, Inc. | SEC filing · Form EFFECT | SEC EDGAR | -1.02% | +4.61% | |
| Form PRE 14A ESS Tech, Inc. For: Sep 14 | SEC filing · Form PRE | SEC EDGAR | -5.16% | -10.34% | |
| Form S-3 ESS Tech, Inc. | SEC filing · Form S-3 | SEC EDGAR | -2.48% | -5.28% | |
| Form 8-K ESS Tech, Inc. For: Aug 28 | SEC filing · Form 8-K | SEC EDGAR | +0.50% | +0.65% | |
| ESS Achieves “Awardable” Status Through Department of War’s Tradewinds Solutions Marketplace | Press release | Business Wire | -0.98% | -9.37% | |
| ESS Tech, Inc. Announces Closing of $3.2 Million Registered Direct Offering and Concurrent Private Placement | Press release | Business Wire | -2.92% | -3.64% | |
| Form 8-K ESS Tech, Inc. For: Aug 20 | SEC filing · Form 8-K | SEC EDGAR | -2.92% | -3.64% | |
| ESS Tech, Inc. Announces $3.2 Million Registered Direct Offering and Concurrent Private Placement | Press release | Business Wire | — | -40.59% | |
| ESS to Present at Sidoti Micro-Cap Virtual Conference | Press release | Business Wire | -4.87% | +0.64% | |
| ESS Tech, Inc. Announces Second Quarter 2026 Financial Results | Press release | Business Wire | -7.26% | -7.86% | |
| Form 10-Q ESS Tech, Inc. For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -7.26% | -7.86% | |
| Form 8-K ESS Tech, Inc. For: Aug 11 | SEC filing · Form 8-K | SEC EDGAR | -7.26% | -7.86% | |
| ESS Reschedules Second Quarter 2026 Financial Results Conference Call to Tuesday, August 11, 2026 at 5:00 p.m. Eastern Time | Press release | Business Wire | -6.15% | — | |
| ESS Tech Signs Letter of Intent for Proposed Business Combination | Press release | Business Wire | -4.11% | -7.51% | |
| Form 8-K ESS Tech, Inc. For: Aug 06 | SEC filing · Form 8-K | SEC EDGAR | -4.11% | -7.51% | |
| ESS Named One of TIME and Statista's World's Top GreenTech Companies in 2026 for the Second Consecutive Year | Press release | Business Wire | +2.24% | +6.25% | |
| ESS to Host Second Quarter 2026 Financial Results Conference Call on Thursday, August 13, 2026 at 5:00 p.m. Eastern Time | Press release | Business Wire | -1.33% | -4.69% | |
| ESS and Juniper Energy Sign Agreement for 500 MWh+ of Sodium-Ion Energy Storage Deployments | Press release | Business Wire | -0.88% | -2.23% | |
| Form 8-K ESS Tech, Inc. For: Jul 16 | SEC filing · Form 8-K | SEC EDGAR | -4.99% | -2.67% | |
| ESS Introduces Bridge™, a Modular Sodium-Ion Battery Energy Storage System for Grid-Scale, Data Center, and Commercial Applications | Press release | Business Wire | +1.89% | +2.53% | |
| Form 8-K ESS Tech, Inc. For: Jun 30 | SEC filing · Form 8-K | SEC EDGAR | -2.10% | -9.16% | |
| ESS Added to Russell Microcap® Index | Press release | Business Wire | -0.15% | +12.03% | |
| ESS to Accelerate Sodium-Ion Battery Energy Storage System Development Following Surging Customer Interest | Press release | Business Wire | +5.50% | -3.61% | |
| Form 8-K ESS Tech, Inc. For: Jun 23 | SEC filing · Form 8-K | SEC EDGAR | +5.50% | -3.61% | |
| Form 8-K ESS Tech, Inc. For: Jun 12 | SEC filing · Form 8-K | SEC EDGAR | -4.08% | -8.41% | |
| Form 8-K ESS Tech, Inc. For: Jun 09 | SEC filing · Form 8-K | SEC EDGAR | +1.58% | -5.88% | |
| Form SD ESS Tech, Inc. | SEC filing · Form SD | SEC EDGAR | +0.96% | -1.92% | |
| Form 8-K ESS Tech, Inc. For: May 29 | SEC filing · Form 8-K | SEC EDGAR | +0.96% | -1.92% | |
| ESS to Present in Clean Energy Group’s Beyond Lithium Webinar Series on June 3, 2026 | Press release | Business Wire | +0.00% | +3.96% | |
| ESS to Attend Sidoti Micro-Cap Virtual Conference on May 20, 2026 | Press release | Business Wire | -7.21% | -2.99% | |
| ESS Tech, Inc. Announces First Quarter 2026 Financial Results | Press release | Business Wire | -1.84% | -25.70% | |
| Form 10-Q ESS Tech, Inc. For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -1.84% | -25.70% | |
| Form 8-K ESS Tech, Inc. For: May 07 | SEC filing · Form 8-K | SEC EDGAR | -1.84% | -25.70% | |
| ESS Highlights Third-Party Utility Validating Iron Flow Battery Technology | Press release | Business Wire | +0.00% | -0.87% | |
| ESS Announces Successful Commissioning of Long-Duration Iron Flow Battery Systems at Turlock Irrigation District Solar-Over-Canal Project | Press release | Business Wire | +0.45% | +3.60% | |
| ESS Partners with Alsym Energy to Deliver 8.5 GWh of Non-Lithium Battery Energy Storage Solutions | Press release | Business Wire | +0.93% | +1.85% | |
| ESS to Host First Quarter 2026 Financial Results Conference Call on Thursday, May 7, 2026 at 5:00 p.m. Eastern Time | Press release | Business Wire | -1.72% | -1.72% | |
| Form 8-K ESS Tech, Inc. For: Apr 10 | SEC filing · Form 8-K | SEC EDGAR | +0.68% | -3.39% | |
| Form ARS ESS Tech, Inc. For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.68% | -3.39% | |
| Form DEF 14A ESS Tech, Inc. For: Dec 31 | SEC filing · Form DEF | SEC EDGAR | +0.68% | -3.39% | |
| Form DEFA14A ESS Tech, Inc. | SEC filing · Form DEFA14A | SEC EDGAR | +0.68% | -3.39% | |
| ESS Engages MZ Group to Lead Strategic Investor Relations and Shareholder Communications Program | Press release | Business Wire | -1.75% | +0.88% | |
| ESS to Attend the 38th Annual ROTH Conference | Press release | Business Wire | +0.00% | -2.26% | |
| ESS Announces Fourth Quarter and Full Year 2025 Financial Results | Press release | Business Wire | -0.76% | -0.76% | |
| Form 10-K ESS Tech, Inc. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | -0.76% | -0.76% | |
| Form 8-K ESS Tech, Inc. For: Mar 05 | SEC filing · Form 8-K | SEC EDGAR | -0.76% | -0.76% | |
| Form S-8 ESS Tech, Inc. | SEC filing · Form S-8 | SEC EDGAR | -0.76% | -0.76% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the GWH section they belong to.
Where else GWH is measured.
GWH earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is ESS Tech, Inc.'s median reaction calculated?
Every labeled GWH news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 258 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 38% of GWH's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does GWH's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.