{"url_path":"/sec/gwh/8-k/2026-06-23/item-9-01","section_key":"item-9-01","section_title":"Item 9.01 Financial Statements and Exhibits.","topic":"sec","document":{"doc_type":"8-K","doc_date":"2026-06-23","source_url":"https://www.sec.gov/Archives/edgar/data/1819438/0001819438-26-000053-index.html","accession_number":"0001819438-26-000053","cik":"0001819438","ticker":"GWH","issuer_name":"ESS Tech, Inc.","edgar_url":"https://www.sec.gov/Archives/edgar/data/1819438/0001819438-26-000053-index.html","primary_entity_key":"0001819438","primary_entity_name":"ESS Tech, Inc."},"word_count":847,"has_tables":true,"body_markdown":"Item 9.01    Financial Statements and Exhibits.\n\n(d) Exhibits.\n\nExhibit No.\n\n99.1\n[Press Release](esspressrelease2026sodium-.htm)\n\n99.2\n[Updated Risk Factors](updatedriskfactors2026sodi.htm)\n\n104Cover page interactive data file\n\nForward-Looking Statements\n\nThis communication contains forward-looking statements (including within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, and Section 27A of the Securities Act of 1933, as amended) concerning the company and other matters that involve substantial risks and uncertainties. These statements may discuss the management team’s goals, beliefs, hopes, intentions and expectations as to future plans, trends, events, results of operations and financial condition, or otherwise, based on current beliefs of the management of the company, as well as assumptions made by, and information currently available to, the company’s management. These forward-looking statements can be identified by the use of forward-looking terminology, including the words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “will,” “would,” or, in each case, their negative or other variations or comparable terminology may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. These forward-looking statements, which are subject to\n\nrisks, uncertainties and assumptions about us, may include our anticipated growth strategies and anticipated trends in our business. Examples of forward-looking statements include, among others, ESS’ plans for its business, ESS’ potential opportunities that approach $1 billion in sodium-ion opportunities, the demand for non-lithium battery solutions, the timeline for ESS' development of sodium-ion BESS, power demands and energy storage, ESS’ ability to generate near-term revenue and reduce its expenses, statements by ESS’ CEO, and ESS’ ability to grow and our ability to meet the growing demand for energy storage. These forward-looking statements are based on ESS’ current expectations and beliefs concerning future developments and their potential effects on ESS. Many factors could cause actual future events to differ materially from the forward-looking statements in this communication. There can be no assurance that the future developments affecting ESS will be those that we have anticipated. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond ESS control) or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements, which include, but are not limited to, the demand for our sodium-ion BESS not developing as anticipated; our strategy to allocate resources toward sodium-ion BESS not achieving the anticipated benefits and adversely affecting the development of our iron flow battery technology; our ability to generate revenue, including in the near-term; our cash burn and cash runway; our ability to realize and capitalize on sodium-ion opportunities; delays in the development of our sodium-ion BESS; our ability to expand our portfolio; our ability to execute and meet timelines related to Project New Horizon; our products being in the early stage of commercialization and aspects of our technology not having been fully field tested; our inability to develop our business and effectively commercialize our energy storage products; our dependence on third-party suppliers; our ability to secure or maintain long-term supply relationships with critical suppliers; delays, disruptions or quality control problems in our manufacturing operations; our ability to adequately control our costs, effectively scale our operations and achieve our cost reduction strategy; our reliance on complex machinery; our ability to increase our production capacity; product recalls, defects or performance problems with our products; required maintenance being performed incorrectly or maintenance requirements exceeding our current expectations; our history of losses; our ability to continue as a “going concern”; our ability to secure binding orders; failure to deliver the benefits offered by our technology; inability to achieve market acceptance of our products; our ability to sell effectively to large customers; failure to accurately estimate future supply and demand for our products and services; failure to manage our growth effectively; failure to meet the obligations under our sales contracts and service agreements; our ability to complete on schedule and within budget; loss of a member of our senior management or other key personnel; changes to our leadership team; expansions into new markets, product lines or services; our warranty obligations; failure to identify or complete commercial or financial transactions; changes in the global trade environment; our projects relationships with related parties; regulatory challenges; our ability to protect our intellectual property; and our ability to raise capital in the near future; general economic and market conditions as well as geopolitical developments and other risks and uncertainties described more fully in Exhibit 99.2 of the Current Report on Form 8-K filed by the Company on June 23, 2026 and the Company's other filings with the U.S. Securities and Exchange Commission. Except as required by law, ESS is not undertaking any obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise.\n\nSIGNATURE\n\nPursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.\n\nDated: June 23, 2026\n\nESS TECH, INC.\n\nBy:/s/ Kate Suhadolnik\n\nName:Kate Suhadolnik\n\nTitle:Chief Financial Officer"}