Every 424B that ESS Tech, Inc. (GWH) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A 424B covers the supplement that carries the terms of a priced offering, so if you follow GWH and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full GWH filings page.
ESS Tech, Inc. (GWH) has filed a resale prospectus covering up to 13,120,000 shares of common stock issuable upon exercise of outstanding warrants held by existing investors and its placement agent. These include 12,800,000 Common Warrant Shares and 320,000 Placement Agent Warrant Shares, all with a $0.50 exercise price.
The company will not receive proceeds from resales, but could receive up to $6.6 million if all warrants are exercised for cash, which it currently expects to use for working capital, general corporate purposes, and about $500,000 to repay a promissory note. The warrants are not exercisable until stockholders approve their issuance and a reverse split to regain NYSE minimum price compliance. Anti-dilution and reverse-split adjustments may increase shares issuable on exercise. ESS’s auditor has highlighted recurring losses and negative operating cash flows that raise substantial doubt about its ability to continue as a going concern.
ESS Tech, Inc. (GWH) is conducting a primary offering of 6,400,000 shares of common stock at $0.50 per share, for gross proceeds of $3.2 million. After a 7.0% placement fee and expenses, ESS expects net proceeds of about $2.5 million.
In a concurrent private placement, ESS will issue unregistered warrants for up to 12,800,000 shares to investors and 320,000 warrants to the placement agent, all with a $0.50 exercise price and five‑year terms starting after required stockholder approval. ESS plans to use proceeds for general corporate purposes, working capital, and to repay about $1.5 million on an outstanding promissory note.
Risk disclosures highlight substantial going concern doubt, significant dilution (about $0.55 per share to new investors), heavy reliance on additional capital, and multiple NYSE listing deficiencies that could result in delisting and reduced liquidity if not cured.
ESS Tech, Inc. is updating the terms of its at-the-market equity program for up to $75,000,000 of common stock under an Amended Sales Agreement. The company removed BMO Capital Markets, Canaccord Genuity, Needham & Company, and Stifel from the group of sales agents and added Roth Capital Partners as a new Agent.
Roth has also replaced Canaccord as the qualified independent underwriter under FINRA Rule 5121, and ESS Tech has agreed to indemnify Roth against certain liabilities, including under the Securities Act of 1933. From December 11, 2025 through this supplement date, ESS Tech sold 4,324,577 shares of common stock for an aggregate offering price of approximately $6,238,450, leaving common stock with an aggregate offering price of approximately $68,761,550 available to be offered under the Amended Sales Agreement.
The company’s common stock trades on the NYSE under the symbol GWH, and the last quoted sale price on July 15, 2026 was $1.02 per share.
ESS Tech, Inc. is conducting a primary offering of 3,471,428 shares of common stock and Pre-Funded Warrants to purchase up to 5,100,000 additional shares. Gross proceeds are approximately $14.999 million, with estimated net proceeds of about $13.5 million, earmarked for working capital and general corporate purposes. Assuming full exercise of the Pre-Funded Warrants, common shares outstanding are expected to rise to 31,948,431, meaning meaningful dilution for existing holders. ESS reports preliminary 2025 revenue of about $1.6 million, a decline of $4.7 million from 2024, but expects a smaller operating loss of roughly $55.0 million, an improvement of $34.8 million. Cash, cash equivalents and short-term investments are expected to be around $22.0 million as of December 31, 2025, helped by prior equity sales and partial repayment of a $30 million promissory note, with $5.6 million remaining outstanding. The company’s auditor has raised substantial doubt about ESS’s ability to continue as a going concern, and ESS has received NYSE notices for not meeting market capitalization and equity listing standards, creating added listing and financing risk.
ESS Tech, Inc. is registering up to 1,181,416 shares of common stock for resale by existing holders. These shares are issuable from warrants granted in two financings: 129,312 Bridge Financing Warrant Shares with a $3.48 exercise price and 1,052,104 Promissory Note Warrant Shares with a $9.98 exercise price. ESS is not selling shares itself and will not receive proceeds from stockholder resales, but could receive up to about $11.0 million in cash if all warrants are exercised, which it plans to use for working capital and general corporate purposes. Shares outstanding were 19,617,070 as of October 31, 2025, or 20,927,798 assuming full warrant exercise.
ESS develops long-duration iron flow batteries using earth-abundant materials for grid and commercial energy storage. The company highlights significant risks, including substantial doubt about its ability to continue as a going concern, with $3.5 million in cash and cash equivalents as of September 30, 2025, and a prior NYSE notice that its market capitalization and stockholders’ equity fell below listing standards, raising potential delisting consequences.
ESS Tech, Inc. is launching an at-the-market offering of up to $75,000,000 of common stock through Yorkville Securities, BMO, Canaccord, Needham and Stifel as sales agents or principals. Shares may be sold from time to time on the NYSE, where ESS trades under the symbol GWH, with the agents earning a 3.0% commission on gross proceeds.
ESS intends to use the vast majority of net proceeds to make installment payments under a Promissory Note of up to $40 million held by YA II PN, LTD., with at least 80% of proceeds directed to this note until it is repaid; remaining funds will go to working capital and general corporate purposes. Because Yorkville Securities is affiliated with YA II, the deal is a FINRA Rule 5121 “conflict of interest” offering, with Canaccord acting as qualified independent underwriter.
ESS highlights substantial dilution risk, using an example at an assumed $4.13 sale price, and discloses a going concern warning, noting $3.5 million in cash and cash equivalents as of September 30, 2025 and recurring losses.
ESS Tech, Inc. (GWH) launched an at‑the‑market offering of up to $75,000,000 of common stock under a Sales Agreement with Yorkville Securities, BMO Capital Markets, Canaccord Genuity, Needham & Company, and Stifel. Sales may be made from time to time as defined in Rule 415(a)(4). The Agents will receive a 3.0% commission on gross proceeds. Our common stock last traded at $4.40 on November 12, 2025.
Net proceeds will be applied pursuant to a Promissory Note with YA II PN, LTD: proceeds first satisfy any installments due within thirty days; thereafter, 80% of remaining proceeds go to installment payments in order of maturity until the note is repaid, with the balance and all post‑repayment proceeds for working capital and general corporate purposes. Because Yorkville Securities is an affiliate of YA II, this constitutes a FINRA Rule 5121 conflict of interest; Canaccord serves as qualified independent underwriter. ESS highlights dilution risk and notes the auditor’s going concern explanatory paragraph. Shares outstanding were 15,390,884 as of September 30, 2025.