ESS Tech, Inc. — Investor Relations & Filings
ESS Tech, Inc. designs and manufactures long-duration energy storage (LDES) solutions centered on its proprietary iron flow battery technology. The company's systems utilize earth-abundant materials like iron, salt, and water to provide safe and sustainable energy storage for commercial and utility-scale applications. Engineered for a 25-year design life, the technology offers unlimited cycling with no capacity degradation and can provide up to 22 hours of continuous power. These scalable solutions are designed to enable renewable baseload energy, support industrial microgrids, power AI data centers, and facilitate the electrification of transportation, with the goal of accelerating global decarbonization.
| ID | Filing | Released | Lang | Actions | |
|---|---|---|---|---|---|
|
2025
15 filings
| |||||
| 13281275 | FORM 4 | 2025-10-15 | English | ||
| 13281276 | FORM 4 | 2025-10-15 | English | ||
| 13281278 | 8-K | 2025-10-14 | English | ||
| 13281279 | 424B2 | 2025-10-14 | English | ||
| 13281281 | 8-K | 2025-10-14 | English | ||
| 13281282 | 424B2 | 2025-10-10 | English | ||
| 13281280 | 424B2 | 2025-10-09 | English | ||
| 13281283 | DEFA14A | 2025-10-07 | English | ||
| 13281286 | 424B2 | 2025-10-07 | English | ||
| 13281284 | 424B2 | 2025-09-30 | English | ||
| 13281285 | Regulatory Filings 2025 | 2025-09-25 | English | ||
| 13281287 | 424B2 | 2025-09-25 | English | ||
| 13281289 | ARS | 2025-09-22 | English | ||
| 13281291 | DEF 14A | 2025-09-22 | English | ||
| 13281288 | 424B2 | 2025-09-19 | English | ||
Market data
Market data not available
Price history
Peer group · Manufacture of batteries and accumulators
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ESS Tech, Inc. via the API
Pull this company's filings, identifiers, and metadata as JSON or Markdown. Authenticate with your API key, then query by company ID, ISIN, or LEI. Full schema documented in the OpenAPI spec.
Endpoints
| GET | /api/companies/34863/ | Company identity, sector, listing, identifiers |
| GET | /api/filings/?company=34863 | Paginated list of all filings (filterable by type, date, language) |
| GET | /api/filings/{id}/ | Single filing — metadata, document URL, processing status |
| GET | /api/filings/{id}/markdown/ | Filing content as Markdown (PDF → text/tables/figures) |
| GET | /api/isins/?company=34863 | All ISINs registered to this company |
| GET | /api/filing-types/ | Reference: every filing-type code + category |
cURL
$ curl https://api.financialreports.eu/api/filings/?company=34863 \ -H "x-api-key: $FR_API_KEY" \ -H "Accept: application/json"
Python
import requests r = requests.get( "https://api.financialreports.eu/api/filings/", params={"company": 34863}, headers={"x-api-key": API_KEY}, ) filings = r.json()["results"]
MCP server
// MCP server URL https://mcp.financialfilings.com/mcp // Once connected, the LLM can query this company directly: "Pull the latest 5 filings for ESS Tech, Inc. (id: 34863)"
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