Aspen Aerogels (ASPN) Q3 2026 earnings review
Aspen Aerogels sales jump 71%, but its fourth-quarter plan drops
Aspen Aerogels, the maker of aerogel insulation for electric-vehicle batteries and energy pipes, rebounded sharply in sales during the third quarter, but its fourth-quarter plan steps back down. Revenue jumped 71% from last quarter to $85 million as energy-project shipments nearly doubled and chief executive Don Young cited higher demand from General Motors and European carmakers. That beat the company's own plan, yet GAAP net loss widened to $10 million because costs from the April Rhode Island plant explosion reached $15 million.
| Revenue | $85.2M +71% from last quarter; +17% from a year ago |
|---|---|
| Adjusted EBITDA (excluding one-offs) | $19.8M above the $7–15M outlook; excludes $15.1M of plant accident costs |
| GAAP net loss | $(10.4)M missed the $(9)–(6)M outlook on accident costs and a $4.6M write-down |
| Q4 revenue outlook | $60–75M middle of the range: down 21% from Q3 |
⚖️ Verdict: 🟢 Bullish
The story got better because the company proved its smaller cost base can generate strong profit excluding one-offs when factory volume arrives, and European EV sales hit a record. Two cautions offset that progress: the fourth-quarter outlook points to a 21% revenue drop from the third quarter at the middle of the range, and unpaid customer bills kept operating cash flow negative.
The question now is whether the third-quarter surge was a durable turn in demand or a one-quarter catch-up on delayed energy orders and GM inventory. If demand is durable, fourth-quarter sales will beat the $67.5 million midpoint and Energy Industrial will ship another $40 million; if it was a catch-up, revenue will drop toward $60 million. Fourth-quarter segment sales and cash collections will tell.
🐂 Bull Case
Energy Industrial Doubled and Lifted Adjusted Margins
Aspen Aerogels makes aerogel insulation for energy pipes under its Energy Industrial division. Management had promised that shipping delayed gas and subsea orders would double the division's sales this quarter and prove the company's lower cost base works.
The division delivered $39.9 million in sales, up 96% from last quarter and 64% from a year ago. It also won its first order for a data center project, which ships in the fourth quarter, and secured a major project for 2027. That volume lifted gross margin excluding one-offs by 13 percentage points from a year ago to 41%, while EBITDA excluding one-offs reached $19.8 million.
What to watch: fourth-quarter Energy Industrial sales. By our math, hitting the full-year target of 20% growth requires $40.7 million in the fourth quarter, which would prove this quarter was not a one-time catch-up.
EV Barriers Beat the Plan on GM and Europe
The Thermal Barrier segment sells PyroThin, a heat shield that stops electric-vehicle battery fires, primarily to General Motors (GM) and European carmakers. Chief executive Don Young said the third-quarter rebound came from "increased demand from GM, and growing contributions from European EV customers".
Segment revenue rose 54% from last quarter to $45.3 million, beating the $25 million to $40 million range implied by the company's prior outlook. European carmakers accounted for a record $8.0 million, bringing their nine-month total to $18.9 million by our math. The insulation maker also booked its first sales for stationary battery storage.
The European ramp puts the $20 million to $30 million full-year target within easy reach. However, finance chief Grant Thoele cited "seven OEMs across eight programs" in Europe, down from nine programs last quarter, and North American sales still include about $4.9 million per quarter of non-cash settlement credits from GM.
What to watch: European EV revenue in the fourth quarter. A reading above $6.1 million would push full-year European sales past the $25 million middle of the target range.
🐻 Bear Case
Fourth-Quarter Plan Points to a 21% Revenue Drop
Finance chief Grant Thoele said the fourth-quarter outlook reflects "sustained demand across both segments, including increased LNG activity and our first data center infrastructure project". Both core businesses depend on lumpy customer schedules—GM's battery factory rates in North America and shipment dates for large energy projects.
Despite that upbeat framing, Aspen forecast fourth-quarter revenue of $60 million to $75 million, and EBITDA excluding one-offs of $5 million to $13 million. At the $67.5 million middle of the range, sales would fall 21% from the third quarter, and EBITDA excluding one-offs would drop by more than half.
That step-down cuts against the claim of sustained demand. By our math, if Energy Industrial delivers the $40.7 million needed to meet its 20% full-year growth goal, Thermal Barrier sales must fall 41% from the third quarter to $26.8 million; if EV barriers hold steady, then energy project shipments must fall.
What to watch: fourth-quarter segment revenue split on the next earnings call. A drop below $40 million in Energy Industrial would mean the company missed its full-year growth target.
Plant Accident Costs Tripled and Widened the Loss
An April explosion damaged an oven at the East Providence, Rhode Island plant, forcing the company to buy insulation from a contract manufacturer in China while it repairs the line. Management said restoring full production at the plant "remains on track for completion in the first half of 2027".
Those disruption costs jumped from $5.3 million last quarter to $15.1 million, or 17.3% of revenue by our math, for "expedited freight, professional fees, and the incremental cost of temporarily sourcing certain products from the Company's external manufacturing facility". Aspen also booked a $4.6 million "write-down of certain Statesboro, Georgia manufacturing assets" that remain unsold.
- Cost of making products: 75.9% of revenue, up 4.3 percentage points from a year ago
- GAAP gross margin: 24.1%, down 4.3 percentage points from a year ago
- EBITDA excluding one-offs, minus the $15.1 million accident add-back: $4.7 million by our math
Because accident costs exceeded the $5 million to $10 million outlook assumption, GAAP net loss widened to $10.4 million and missed the company's plan. Management excludes these extra sourcing costs from Adjusted EBITDA, and expects another $5 million to $10 million in the fourth quarter.
What to watch: East Providence accident charges and insurance collections in the fourth quarter. Charges above $10 million would mean external sourcing costs are not coming down as the plant restarts.
Receivables Jump Kept Operating Cash Flow Negative
Aspen needs positive cash generation to protect its balance sheet and stay above lender requirements while paying for the Rhode Island plant recovery. Even though third-quarter sales jumped by $35.3 million from the second quarter, operations still burned $3.8 million in cash.
- Accounts receivable (uncollected customer bills): $62.3 million, up $22.0 million from last quarter
- Deferred revenue (customer prepayments): $25.1 million, down $10.2 million from last quarter
- Accounts payable and accrued expenses (unpaid bills): $68.5 million, up $28.4 million from last quarter
- Total cash: $146.5 million, down $6.9 million from last quarter
The company leaned on unpaid supplier bills to limit the cash burn, because it had not yet collected on late-quarter shipments and recognized non-cash revenue from the GM settlement. By our math, cash minus bank debt (excluding leases) stands at $61.7 million, just below the roughly $63 million year-end floor management targeted last quarter.
What to watch: fourth-quarter operating cash flow and accounts receivable. A drop in receivables as Q3 bills are paid should swing operating cash flow positive and lift net cash above $63 million.
👓 Other Themes
Former Citadel Energy Analyst Joins the Board
Aspen appointed Stacy Nieuwoudt to its board of directors on November 4, 2026, placing her on the audit and compensation committees. Nieuwoudt spent nearly a decade as an energy and industrials analyst at Citadel units Surveyor Capital and Aptigon Capital, and currently sits on the board of ProFrac Holding Corp. Her addition brings energy-market and investor oversight as the company leans more heavily on its Energy Industrial segment.
💲 Other KPIs
Fell by $8.0 million from last quarter and $31.6 million from a year ago by our math, as the company used $7.3 million of financing cash flow to pay down borrowings. Total debt includes $73.5 million of term debt, $11.2 million on the credit line, and $9.8 million of lease and sale-leaseback obligations.
Research, sales, and administrative expenses totaled $23.1 million by our math, flat against $23.1 million last quarter and $22.6 million a year ago. Because revenue rebounded, these overhead costs fell to 27.1% of revenue from 46.4% in the second quarter and 30.9% a year earlier.
Up 0.8% from 82.4 million a year ago and 0.2% from 82.9 million in the second quarter, driven by employee stock compensation. The insulation maker has not repurchased shares, and its fourth-quarter plan assumes the count stays at 83.1 million.
🔮 Guidance
New. The plan calls for $67.5 million at the middle of the range, up 63% from last year's depressed fourth quarter but down 21% from the third quarter. Over the past four quarters, reported revenue beat the middle of the company's initial outlook by an average of 5.9% by our math.
New. The middle of the range is $9.0 million, or a 13.3% margin by our math, down from $19.8 million in the third quarter due to lower planned revenue. The target excludes an estimated $5 million to $10 million of Rhode Island plant accident and external sourcing costs.
New. The plan points to a $9.5 million loss at the middle of the range, slightly narrower than the $10.4 million loss in the third quarter. It assumes $5 million of depreciation, $3 million of stock compensation, $3 million of net interest expense, and $5 million to $10 million of plant accident costs.
New. At the $(0.115) middle of the range, the loss per share narrows slightly from $(0.13) in the third quarter on 83.1 million shares.
Unchanged. Aspen kept its full-year spending cap below $10 million for afourth straight quarter, which excludes spending to rebuild the damaged Rhode Island plant.
❓ Key Questions
Why does the Q4 outlook drop 21% from Q3?
The $67.5 million fourth-quarter midpoint is $17.7 million below the third quarter. Which segment drives that drop, and does Energy Industrial still reach its 20% full-year growth target?
Did Aspen collect the $8.9 million insurance payment?
Investing cash flow was positive $4.2 million in the third quarter, while plant accident costs jumped to $15.1 million. How much insurance cash arrived in Q3, and how much has been filed for business interruption?
Why did the European EV program count drop to eight?
Finance chief Grant Thoele cited "seven OEMs across eight programs" in Europe this quarter, compared with seven carmakers and nine platforms last quarter. Did a European customer cancel or combine a vehicle program?
What caused the $4.6 million Georgia asset write-down?
Assets held for sale fell from $32.2 million to $27.7 million as the company booked a $4.6 million disposal loss on the cancelled Statesboro plant. Did current buyer bids come in below carrying value?
How large is the new data center insulation opportunity?
Management announced its first Energy Industrial order for a data center project, shipping in the fourth quarter. What is the dollar size of this order, and what problem is the aerogel solving inside the data center?