ESS Tech, Inc. filings document the public-company records of an energy storage manufacturer focused on long-duration iron flow systems. Recent disclosures include Form 8-K reports for operating results and financial condition, material agreements, capital-structure matters, and securities identified as common stock and warrants.
The company's proxy materials cover annual meeting matters, board composition, executive compensation and corporate-governance practices. Other filings record leadership changes, shareholder voting matters, liquidity and financing disclosures, and formal updates tied to commercialization of ESS energy storage products.
ESS Tech, Inc. Schedule 13G/A amendment shows Alyeska Investment Group, L.P. (with related Alyeska entities) beneficially owns 1,400,000 shares of Common Stock, representing 5.15% of the class as of March 31, 2026. The filing cites 27,173,757 shares outstanding per the Form 10-K dated March 5, 2026. The disclosure is a joint filing; Anand Parekh is named but disclaims beneficial ownership. The statement notes Alyeska Investment Group, L.P. exercises voting and investment control over shares held by Alyeska Master Fund, L.P.
ESS Tech, Inc. reports that Ayrton Capital LLC, Alto Opportunity Master Fund (Segregated Master Portfolio B) and Waqas Khatri each hold 3,018,635 shares of Common Stock beneficially owned through warrants, representing 9.99% of the class as of March 31, 2026.
The filing states the issuable shares are from exercisable Warrants and are subject to a 9.99% beneficial ownership blocker. The 9.99% figures are calculated using 27,173,757 shares outstanding as of February 27, 2026, per the issuer's 10-K.
ESS Tech, Inc. reported Q1 2026 results showing a small business but significant losses and funding pressure. Revenue was only $0.1 million, down sharply from $0.6 million a year earlier, as the company winds down older contracts while focusing on its Energy Base product.
Cost of revenue was $7.2 million, including higher depreciation and inventory reserves, leading to a gross loss of $7.0 million. Operating expenses fell 33% to $6.7 million, mainly from lower sales and marketing and general and administrative costs. Net loss narrowed to $15.9 million, but interest expense of $2.5 million from the Yorkville promissory note and a sale-leaseback weighed on results.
ESS ended the quarter with $15.5 million in cash and cash equivalents and $6.0 million in short‑term investments, for $21.5 million in liquid assets. Management states that continued losses and limited liquidity create substantial doubt about the company’s ability to continue as a going concern over the next 12 months without new debt or equity financing, despite recent financings including an at‑the‑market program, a registered direct offering, and the Yorkville promissory note.
ESS Tech, Inc. reported first quarter 2026 results showing cost controls but still early-stage revenue. Revenue was $128 thousand for the quarter ended March 31, 2026, down from $0.6 million a year earlier as fewer systems were delivered.
Total operating expenses fell 33% to $6.7 million, mainly from lower sales, marketing, and general and administrative spending as the company redirected resources toward product development. Net loss improved to $(15.9) million, or $(0.54) per share, compared with $(18.0) million, or $(1.50) per share, in the prior-year period.
Adjusted EBITDA loss improved 31% year-over-year to $(10.3) million. Net cash used in operating activities decreased to $13.5 million. ESS ended the quarter with $15.5 million in unrestricted cash and cash equivalents and $6.0 million in short-term investments, for total liquidity of $21.5 million, supported by a $15 million registered direct equity offering.
ESS Tech, Inc. filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2025. The company describes its business as a developer and manufacturer of long-duration iron flow batteries (including a patented Proton Pump) designed for ~20,000 cycles and multi-hour storage durations. The report discloses $22.0 million in cash and short-term investments and states there is substantial doubt about the company’s ability to continue as a going concern. The filing lists 27,173,757 shares outstanding as of February 27, 2026, a reported net loss of $63.4 million for 2025, an accumulated deficit of $845.8 million, approximately 315 patents granted/applied-for, and 62 full-time employees as of December 31, 2025.
ESS Tech, Inc. is calling a virtual 2026 annual meeting on May 29, 2026 at 8:00 a.m. Pacific time for holders of 27,922,991 shares of common stock as of April 6, 2026. Stockholders will elect two Class II directors, ratify KPMG LLP as auditor, and cast advisory votes on executive pay and how often future say-on-pay votes occur.
The board recommends voting for both director nominees, for KPMG’s ratification, for approving named executive officer compensation, and for holding say-on-pay votes every one year. The proxy also outlines board independence, committee structures, a prior 1-for-15 reverse stock split, and detailed 2025 compensation for senior executives.
ESS Tech, Inc. reported that director and Founding Chairman Michael Niggli has notified the company he will resign from its Board of Directors, Audit Committee, and Nominating and Corporate Governance Committee, effective as of the 2026 annual meeting of stockholders on May 29, 2026.
The company stated that Mr. Niggli’s resignation is not due to any disagreement regarding operations, policies, or practices. ESS Tech expressed gratitude for his leadership as Founding Chairman and his years of service and contributions to the company.
ESS Tech, Inc. is an early-stage long-duration energy storage company focused on iron flow batteries for grid and commercial applications. Its technology uses earth-abundant materials, targets up to 20,000 cycles without capacity fade, and is designed for safe, long-duration use in harsh temperatures.
The company remains deeply unprofitable. Revenue fell to $1.6 million in 2025 from $6.3 million in 2024, while net losses were $63.4 million in 2025 and $86.2 million in 2024, leading to an accumulated deficit of $845.8 million. Cash and cash equivalents plus short-term investments were $22.0 million as of December 31, 2025, and management discloses substantial doubt about ESS’s ability to continue as a going concern.
ESS highlights significant risks: early commercialization, manufacturing scale-up challenges, supply chain disruptions, strong competition from lithium-ion and other storage technologies, dependence on government incentives, and the need to raise additional capital. As of mid-2025, non‑affiliate equity market value was about $13.6 million, with 27,173,757 shares outstanding as of February 27, 2026.
ESS Tech, Inc. reported very early-stage commercial revenue and ongoing heavy losses for 2025 while restructuring its business and balance sheet. For the year ended December 31, 2025, revenue was $1.6 million, reflecting limited product and service sales and reductions tied to winding down legacy contracts.
The company posted a net loss of $63.4 million, improved from a $86.2 million loss in 2024, and an Adjusted EBITDA loss of $44.3 million, a 38% year-over-year improvement. Total operating expenses fell 33% to $29.7 million as research and development, sales and marketing, and general and administrative costs were all reduced.
ESS ended 2025 with $14.5 million in cash and cash equivalents, $7.5 million in short-term investments, and working capital of about $1.0 million, down from $15.8 million a year earlier. It bolstered liquidity with a $40 million financing in October 2025, an $8.6 million at-the-market equity raise, and a $15 million registered direct offering completed in January 2026, while repaying about $28.5 million of its initial Yorkville promissory note tranche.
ESS Tech, Inc. Chief Financial Officer Kate Eileen Suhadolnik reported an open-market sale of common stock. On February 20, 2026, she sold 741 shares of ESS Tech common stock at $1.54 per share.
According to the footnotes, these shares were sold specifically to cover tax withholding obligations related to the vesting of restricted stock units (RSUs). After this transaction, she directly owned 164,414 shares of ESS Tech common stock, and a portion of her holdings consists of RSUs, each representing a contingent right to receive one share of common stock.