ESS Tech, Inc.: directors' dealings · United States · SEC (Form 4)

About ESS Tech, Inc.

ESS Tech, Inc. is a U.S.-based energy storage company listed on the NYSE under the ticker GWH. Founded in 2011 and headquartered in Wilsonville, Oregon, United States, the company focuses on long-duration storage using iron flow battery technology. For investors, ESS sits at the intersection of grid modernization, renewable integration, and infrastructure resilience. Its core investment case is built around a differentiated storage chemistry that uses abundant materials such as iron, salt, and water, positioning the company as a specialist in safer, longer-lasting stationary storage rather than a broad battery manufacturer. ([essinc.com](https://essinc.com/about/)) ESS’s main business is the design, manufacture, and deployment of long-duration energy storage systems for commercial, industrial, and utility-scale customers. Its flagship products include Energy Warehouse and Energy Center, which are intended to provide flexible energy capacity over multiple hours. The company emphasizes non-flammable operation, long cycle life, and a low environmental footprint, attributes that are particularly relevant for renewable-heavy grids where storage needs extend beyond short-duration balancing. In practical terms, ESS is aiming at applications where reliability, safety, and multi-hour discharge capability matter more than the energy density metrics often associated with consumer batteries. ([investors.essinc.com](https://investors.essinc.com/overview/default.aspx)) From a competitive standpoint, ESS operates in the emerging long-duration energy storage market, where the industry is still forming and commercial standards are not yet fully mature. The company describes itself as a leading manufacturer in iron flow technology and highlights a sizeable patent portfolio, which supports its technology narrative and may help protect its intellectual property position. At the same time, the sector is capital intensive and execution-sensitive: scaling manufacturing, winning repeat deployments, and proving economic competitiveness against alternative storage chemistries are all critical to long-term success. ESS’s niche positioning gives it a distinctive value proposition, but it also means the company must continuously demonstrate commercial traction. ([essinc.com](https://essinc.com/about/)) Geographically, ESS is anchored in the United States, with its headquarters in Oregon, but it has historically targeted customers beyond the domestic market and presents itself as serving global energy storage needs. The company has also pointed to third-party validations and certifications, which are important for utility customers that require bankability, safety assurance, and compliance with industry standards. ([essinc.com](https://essinc.com/about/)) Recent developments are material. In February 2025, ESS announced leadership changes, including the appointment of Kelly Goodman as interim CEO, and said the board was evaluating commercial or financial transactions to support a new strategic direction. At that time, the company stated it was actively bidding on daily-cycling projects in the 12- to 24-hour long-duration storage market, with initial installations targeted for 2027, and that it wanted to address load growth linked to AI and data centers. In January 2026, ESS announced a registered direct offering of approximately $15 million to support working capital and general corporate purposes. These events suggest a company still in transition, balancing technology commercialization with the need to strengthen its financial and strategic flexibility. ([essinc.com](https://essinc.com/wp-content/uploads/2025/02/ESS-Management-Changes-Press-Release.-4919-8247-7848.8.pdf))