ESS Tech, Inc.
For the period ended Sep 30, 2025. Filed Nov 13, 2025.
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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.
Sep 30, 2025 · Filed Nov 13, 2025
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Condensed Statements of Cash Flows
(in thousands)
| Nine Months Ended September 30, | ||
|---|---|---|
| 2025 | 2024 | |
| Cash flows from operating activities: | ||
| Net loss | $(39,457) | $(62,743) |
| Adjustments to reconcile net loss to net cash used in operating activities: | ||
| Depreciation and amortization | 4,571 | 3,302 |
| Non-cash interest income | (402) | (2,094) |
| Non-cash lease expense | 1,112 | 1,000 |
| Stock-based compensation expense | 3,945 | 8,538 |
| Change in fair value of common stock warrant liabilities | (344) | (459) |
| Other non-cash expenses, net | 192 | 311 |
| Changes in operating assets and liabilities: | ||
| Accounts receivable, net | 108 | 1,352 |
| Inventory | 320 | (4,722) |
| Prepaid expenses and other assets | 2,668 | (1,709) |
| Accounts payable | 353 | 5,671 |
| Accrued and other liabilities | (4,494) | (95) |
| Accrued product warranties | (1,090) | 1,169 |
| Deferred revenue | (2,659) | (122) |
| Operating lease liabilities | (1,253) | (1,142) |
| Net cash used in operating activities | (36,430) | (51,743) |
| Cash flows from investing activities: | ||
| Purchases of property and equipment | (1,074) | (3,823) |
| Maturities and purchases of short-term investments, net | 18,411 | 47,709 |
| Net cash provided by investing activities | 17,337 | 43,886 |
| Cash flows from financing activities: | ||
| Proceeds from issuance of common stock and common stock warrants, net of commission fees | 4,789 | — |
| Proceeds from financing arrangements | 4,000 | — |
| Proceeds from stock options exercised | 5 | 80 |
| Proceeds from contributions to Employee Stock Purchase Plan | 103 | 214 |
| Repurchase of shares from employees for income tax withholding purposes | (36) | (245) |
| Net cash provided by financing activities | 8,861 | 49 |
| Net change in cash, cash equivalents and restricted cash | (10,232) | (7,808) |
| Cash, cash equivalents and restricted cash, beginning of period | 15,195 | 22,483 |
| Cash, cash equivalents and restricted cash, end of period | $4,963 | $14,675 |
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Condensed Statements of Cash Flows (continued)
(in thousands)
| Nine Months Ended September 30, | ||
|---|---|---|
| 2025 | 2024 | |
| Supplemental disclosures of cash flow information: | ||
| Cash paid for operating leases included in cash used in operating activities | $1,330 | $1,306 |
| Non-cash investing and financing transactions: | ||
| Purchase of property and equipment included in accounts payable and accrued and other current liabilities | 2,303 | 2,844 |
| Adjustment to right-of-use assets from lease modification | — | 686 |
| Transfers between inventory and property and equipment, net | 668 | 1,051 |
| Application of deferred revenue to financing arrangements | 6,518 | — |
| Cash and cash equivalents | $3,539 | $12,822 |
| Restricted cash, current | 806 | 906 |
| Restricted cash, non-current | 618 | 947 |
| Total cash, cash equivalents and restricted cash shown in the condensed statements of cash flows | $4,963 | $14,675 |
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