NYSE: GWH

ESS Tech, Inc.

CIK 0001819438 · SIC 3690 · Miscellaneous Electrical Equipment

Micro Revenue $2M Assets $32M as of Aug 30, 2026

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8-K Filed Sep 3, 2026 · Period ending Aug 28, 2026

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8-K Filed Aug 21, 2026 · Period ending Aug 20, 2026

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424B5 Filed Aug 21, 2026 Red flag

ESS Tech prices $3.2M offering at $0.50/share; net proceeds $2.5M, mostly to repay debt

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10-Q Filed Aug 11, 2026 · Period ending Jun 30, 2026

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8-K Filed Aug 11, 2026 · Period ending Aug 11, 2026

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8-K Filed Aug 6, 2026 · Period ending Aug 6, 2026

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424B5 Filed Jul 17, 2026

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8-K Filed Jul 17, 2026 · Period ending Jul 16, 2026

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8-K Filed Jul 1, 2026 · Period ending Jun 30, 2026

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8-K Filed Jun 23, 2026 · Period ending Jun 23, 2026

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8-K Filed Jun 18, 2026 · Period ending Jun 12, 2026

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8-K Filed Jun 15, 2026 · Period ending Jun 9, 2026

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10-Q Filed May 7, 2026 · Period ending Mar 31, 2026

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10-K Filed Mar 5, 2026 · Period ending Dec 31, 2025

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424B5 Filed Jan 30, 2026 Red flag

ESS Tech prices $1.75/share registered direct offering of 3.47M shares plus pre-funded warrants for up to 5.1M shares, raising $14.1M gross

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424B3 Filed Dec 11, 2025

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424B5 Filed Dec 11, 2025

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10-Q Filed Nov 13, 2025 · Period ending Sep 30, 2025

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424B3 Filed Jul 11, 2025

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10-K Filed Mar 31, 2025 · Period ending Dec 31, 2024

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424B3 Filed Dec 15, 2023

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S-1 Filed Mar 4, 2022

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S-1 Filed Dec 27, 2021

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10-Q/A Filed Dec 6, 2021 · Period ending Jun 30, 2021

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10-K/A Filed Dec 3, 2021 · Period ending Dec 31, 2020

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Latest financial statements

From 10-Q filed Aug 11, 2026 (period ending Jun 30, 2026). As printed on the EDGAR/iXBRL face — not generated by the model.

As filed

Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited)

(in thousands, except share and per share data)

Description Three months ended June 30, 2026 Three months ended June 30, 2025 Six months ended June 30, 2026 Six months ended June 30, 2025
Revenue:
Revenue 4 56 126 627
Revenue related parties 69 2,302 75 2,330
Total revenue 73 2,358 201 2,957
Cost of revenue 7,494 7,459 14,660 16,205
Gross loss (7,421) (5,101) (14,459) (13,248)
Operating expenses
Research and development 2,201 1,424 4,826 3,902
Sales and marketing 562 1,304 816 3,254
General and administrative 4,950 3,728 8,813 9,299
Total operating expenses 7,713 6,456 14,455 16,455
Loss from operations (15,134) (11,557) (28,914) (29,703)
Other (expense) income, net
Interest (expense) income, net (596) 30 (3,092) 246
Gain on revaluation of common stock warrant liabilities 166 459 510 344
Other income, net 11 12 21 31
Total other (expense) income, net (419) 501 (2,561) 621
Net loss and comprehensive loss to common stockholders (15,553) (11,056) (31,475) (29,082)
Net loss per share basic and diluted (0.46) (0.90) (1.00) (2.39)
Weighted-average shares used in per share calculation basic and diluted 33,824,896 12,271,587 31,563,558 12,152,245

Condensed Consolidated Balance Sheets (Unaudited)

(in thousands, except share data)

Description June 30, 2026 December 31, 2025
Assets
Current assets:
Cash and cash equivalents 10,848 14,477
Restricted cash, current 806 806
Accounts receivable, net 10 13
Short-term investments 7,557
Inventory 112 140
Prepaid expenses and other current assets 1,814 3,254
Total current assets 13,590 26,247
Property and equipment, net 11,793 17,224
Intangible assets, net 2,548 2,682
Operating lease right-of-use assets 2,903 3,767
Restricted cash, non-current 918 618
Other non-current assets 724 634
Total assets 32,476 51,172
Liabilities and stockholders' (deficit) equity
Current liabilities:
Accounts payable 1,234 3,023
Accrued and other current liabilities 10,004 11,097
Accrued product warranties 798 985
Operating lease liabilities, current 1,919 1,784
Deferred revenue, current 280 359
Financing obligations, current 5,765 8,044
Total current liabilities 20,000 25,292
Operating lease liabilities, non-current 1,059 2,060
Deferred revenue, non-current related parties 5,297 5,297
Common stock warrant liabilities 63 573
Financing obligations, non-current 8,715 9,291
Other non-current liabilities 29 41
Total liabilities 35,163 42,554
Commitments and contingencies (Note 9)
Stockholders' (deficit) equity:
Preferred stock ($0.0001 par value; 200,000,000 shares authorized, none issued and outstanding as of June 30, 2026 and December 31, 2025)
Common stock ($0.0001 par value; 1,000,000,000 shares authorized, 32,889,323 and 22,377,003 shares issued and outstanding as of June 30, 2026 and December 31, 2025, respectively) 3 2
Additional paid-in capital 874,604 854,435
Accumulated deficit (877,294) (845,819)
Total stockholders' (deficit) equity (2,687) 8,618
Total liabilities and stockholders' (deficit) equity 32,476 51,172

Condensed Consolidated Statements of Cash Flows (Unaudited)

(in thousands)

Description Six months ended June 30, 2026 Six months ended June 30, 2025
Cash flows from operating activities:
Net loss (31,475) (29,082)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization 3,077 3,085
Asset abandonment 4,327
Non-cash interest expense (income) 2,824 (155)
Non-cash lease expense 864 731
Stock-based compensation expense 1,745 2,699
Change in fair value of common stock warrant liabilities (510) (344)
Other non-cash expenses, net 1 199
Changes in operating assets and liabilities:
Accounts receivable, net 3 86
Inventory 28 301
Prepaid expenses and other assets 1,350 468
Accounts payable (1,761) 1,268
Accrued and other liabilities (1,743) (1,485)
Accrued product warranties (187) (1,090)
Deferred revenue (79) (6,458)
Operating lease liabilities (866) (820)
Net cash used in operating activities (22,402) (30,597)
Cash flows from investing activities:
Purchases of property and equipment (1,432) (1,491)
Maturities and purchases of short-term investments, net 7,655 18,411
Net cash provided by investing activities 6,223 16,920
Cash flows from financing activities:
Proceeds from issuance of common stock via ATM, net of issuance costs 4,859 721
Proceeds from issuance of common stock and common stock warrants via RDO, net of issuance costs 13,553
Proceeds from financing arrangements 9,200
Payments on financing obligations (14,775)
Proceeds from stock options exercised 6
Proceeds from contributions to Employee Stock Purchase Plan 13 103
Repurchase of shares from employees for income tax withholding purposes (27)
Net cash provided by financing activities 12,850 803
Net change in cash, cash equivalents and restricted cash (3,329) (12,874)
Cash, cash equivalents and restricted cash, beginning of period 15,901 15,195
Cash, cash equivalents and restricted cash, end of period 12,572 2,321

Amounts as printed on the EDGAR/iXBRL face — (in thousands, except share and per share data); (in thousands, except share data); (in thousands). Labels, columns, and figures are the filing face, not a GAAP stencil. Interactive statements & notes on EDGAR ↗