Eos Energy Enterprises expects third-quarter 2026 revenue of $82 million to $83 million as battery production scales up. Its preliminary update also makes clear that higher sales have not yet produced a positive gross margin: the company expects a GAAP gross margin between negative 55% and negative 53%.
The October 19 release covers the quarter ended September 30. Eos plans to publish full third-quarter results on November 5, 2026, before the U.S. market opens. These are preliminary figures and management expectations, not final financial statements.
The accompanying Form 8-K, Item 8.01, says the estimates were prepared by management and may differ materially from actual results. Eos says neither its independent auditor nor other independent accountants audited, reviewed or performed procedures on these preliminary results, and no assurance was expressed. The cover report and exhibit belong to the same issuer announcement, not two independent confirmations.
The preliminary figures
| Measure | Preliminary position | Official evidence |
|---|---|---|
| Revenue | $82 million–$83 million expected | Issuer SEC exhibit |
| Revenue growth | Approximately 19%–21% sequentially and 169%–172% year on year, according to Eos | Issuer SEC exhibit |
| GAAP gross margin | −55% to −53%; still negative | Issuer SEC exhibit |
| Sequential margin change | Improvement of approximately 16–18 percentage points, according to Eos | Issuer SEC exhibit |
| Cash including restricted cash | Approximately $344 million at September 30; $364 million at June 30 | Issuer SEC exhibit |
| Backlog | Approximately $765 million, or 3.2 GWh, at September 30; not recognized revenue | Issuer SEC exhibit |
| 2026 revenue outlook | Company expects the lower half of its $300 million–$350 million range | Issuer SEC exhibit |
| Full-results schedule | November 5, 2026, before U.S. market open | Issuer SEC exhibit |
Better margin is not the same as profit
Gross margin compares revenue with the cost of goods sold. A negative gross margin means those costs still exceed revenue, before other expenses are considered. An improvement of 16 to 18 percentage points therefore does not mean Eos has reached gross profitability or reported a net profit.
Eos attributed the expected improvement to higher production volumes and lower conversion costs per unit. It said its second manufacturing line at Thorn Hill contributed about 17% of quarterly battery production and was still operating on a partial-shift schedule. Those are the issuer’s operating disclosures, not independent evidence that its future expansion targets will be met.
Cash and backlog need their own labels
The company’s approximately $344 million cash figure includes restricted cash, so it should not be described as an unrestricted cash balance. Eos disclosed about $114 million of operating cash inflows, mainly from customer deposits, project milestone receipts and tax-credit collections, and an additional $87 million advance under its Department of Energy loan facility. The $114 million inflow figure is not presented here as net operating cash flow.
Backlog represents expected revenue from customer agreements. Eos says orders can be modified or cancelled. The approximately $765 million backlog should not be added to quarterly revenue or treated as cash already collected.
What remains to be confirmed
Eos expects full-year revenue in the lower half of its $300 million to $350 million range. That is a forecast. The November 5 release is the next scheduled opportunity to compare the preliminary ranges with full results, review manufacturing costs and examine the financial statements.
For a separate illustration of the distinction between revenue, net income and adjusted results, see CapKet’s Cleveland-Cliffs earnings explainer.
Official source checked: . Release dated October 19, 2026; figures cover the quarter ended September 30, 2026. This is a preliminary issuer update, not a final earnings release.