Earnings Call Insights: Eos Energy Enterprises (EOSE) Q4 2025
Management View
- CEO Joseph Mastrangelo highlighted that “our volume was up. Our margins improved sequentially quarter-over-quarter and year-over-year. We had a great quarter as far as orders being booked,” but clarified, “the bottom line is we missed our guidance, and that falls on me as the CEO of the company.”
- Mastrangelo indicated the company is expanding its installed base, now covering 20% of the United States with 20 projects, and targets reaching 25% coverage in the next few months, with international expansion into Germany and the U.K. planned.
- He emphasized, “on the bottom, yes, 7x year-over-year growth on revenue, combined with our highest cash position that we’ve had in the company’s history, along with closing the gap and moving towards profitability, we’ve removed the going concern language inside of our 10-K filing.”
- The launch of the Indensity product was announced, described as an evolution of existing technology focused on easier operation, serviceability, and manufacturing.
- COO John Mehas stated, “Q4 was my first full quarter at Eos… we completed our subassembly automation, making our battery line fully automated. We closed 2025 with production records across all operations and delivered our fourth consecutive quarter of record revenue.”
- Mehas acknowledged, “we fell short of our operational targets, and that’s on me,” citing supplier nonperformance, automation quality issues, and higher-than-expected downtime as key challenges now being addressed.
- Interim CFO & Chief Commercial Officer Nathan Kroeker reported, “we ended the quarter with just over $701 million in backlog, booking nearly 1.1 gigawatt hours across 8 customers and 9 individual projects, representing a 9% sequential increase. During the quarter, we secured more than $240 million in new orders.”
- Kroeker added, “we ended the year with just under $625 million worth of cash on the balance sheet, the strongest cash position in the company’s history.”
Outlook
- Mastrangelo stated, “Let me wrap up with our outlook on 2026 as we initiate guidance on revenue. You can see the progression of our guidance from 7x. If you take the midpoint of the guidance range in 2026, it’s 3x what we did in 2025.”
- The revenue guidance for 2026 is set at a range of $300 million to $400 million, with the lower end supported by backlog and the upper range dependent on larger project approvals and Indensity shipments in the latter half of the year.
- Mastrangelo explained, “we feel very confident on the guide that we’re giving on the range of $300 million to $400 million.”
- He also noted, “we will be gross margin positive in the second half of 2026.”
Financial Results
- Kroeker reported, “in the fourth quarter, we generated $58 million in revenue, nearly double Q3. We exceeded the combined revenue of the first 3 quarters of 2025 as well as all prior year revenue combined since the company went public.”
- Full year revenue was $114.2 million, described as “more than 7x year-over-year growth.”
- Full year gross loss was $143.8 million, with adjusted gross loss at $128.5 million. Operating expenses totaled $115.4 million, with noncash items making up $25 million.
- Net loss for the year was $969.6 million, including $746.8 million of noncash impacts primarily from mark-to-market revaluations due to the company’s stock price increase.
- Adjusted EBITDA loss was $219.1 million, with margin improvement noted.
Q&A
- Stephen Gengaro, Stifel: Asked about guidance credibility and risk controls after missing Q4 guidance. Mastrangelo replied, “we tried to really look at how we can change our discipline as a company to not have happened what happened in 2025.”
- Julien Dumoulin-Smith, Jefferies: Inquired about the specifics behind larger projects and backlog duration. Mastrangelo pointed to NYSERDA projects and PJM initiatives, but stressed “approvals and queues are long.”
- Dumoulin-Smith also asked about defense sector opportunities, to which Mastrangelo responded that the company is working through government processes and requirements, leveraging its American-made product.
- Mark Strouse, JPMorgan: Asked about the competitive landscape. Mastrangelo said, “there’s many different use cases,” emphasizing Eos’ competitive positioning for 4- to 16-hour storage and recent pipeline growth.
- Craig Shere, Tuohy Brothers: Queried about international margins and cash flow. Mastrangelo said, “where we’re seeing interest in our product internationally has less to do with politics and more to do with performance,” and did not expect lower margins internationally.
- Jeffrey Osborne, TD Cowen: Asked about production yields and field reliability. Mehas replied, “the goal for that automation is 97% first pass yield, and we’re well on our way there.”
Sentiment Analysis
- Analysts expressed skepticism regarding guidance reliability and questioned the company’s ability to deliver on ambitious revenue targets, often pressing for specifics and risk mitigation strategies.
- Management’s tone in prepared remarks was confident and forward-looking, emphasizing improvement and operational discipline, but shifted to a more defensive posture during Q&A, acknowledging past guidance misses and operational setbacks. Mastrangelo used phrases such as “we feel very confident” and “we are focused on being good stewards of that capital.”
- Compared to the previous quarter, analyst questioning was more pointed, and management appeared more cautious in its outlook and explanations.
Quarter-over-Quarter Comparison
- Guidance shifted from reiterating $150 million to $160 million revenue for full-year 2025 in Q3, to projecting $300 million to $400 million for 2026.
- Operational focus evolved from ramping initial automation and capacity in Q3 to addressing explicit execution shortfalls and planning redundancy and process improvements in Q4.
- Analysts became more focused on risk, execution discipline, and margin evolution, compared to a previous emphasis on pipeline and growth.
- Management’s confidence level, while still present, was more tempered as they acknowledged missing Q4 guidance and detailed steps to improve execution reliability.
Risks and Concerns
- Supplier nonperformance, automation quality issues, and excessive downtime were cited as major operational risks that impacted Q4 results.
- Management is implementing better supplier controls, tooling improvements, and process changes to address these risks.
- The lack of manufacturing redundancy remains a key risk until Line 2 is operational.
- Revenue concentration and the timing of large project approvals present ongoing challenges for achieving top-end guidance.
Final Takeaway
Eos Energy management emphasized that while the company delivered record revenue growth and strengthened its cash position in 2025, execution challenges led to a miss in guidance. With a renewed focus on operational improvements, automation, and disciplined expansion, the company has set a 2026 revenue target of $300 million to $400 million and expects to achieve gross margin positivity in the second half of the year. Management underscored ongoing efforts to build long-term value through scalable technology, robust backlog, and prudent cash management, while recognizing the need for continued operational discipline to meet evolving market demands and investor expectations.