AAON (AAON) Q4 2025 earnings review
Explosive Backlog and Sales Growth Eclipse Short-Term Margin and Cash Flow Pains
AAON delivered a blowout quarter for top-line growth, with revenue accelerating to a 42.5% YoY increase. This was fueled by ravenous demand from the data center market for BASX-branded liquid and air-side cooling solutions. Backlog effectively doubled YoY to an astonishing $1.83 billion. However, beneath the hyper-growth, the company is enduring severe growing pains. Operating cash flow for the entire year flatlined at $0.5 million—down from $192.5 million in 2024—as AAON aggressively burned cash to build working capital and fund contract assets. Meanwhile, gross margins remained compressed at 25.9% due to the heavy fixed costs of spinning up the massive new Memphis facility. Entering 2026, management expects growth to stabilize at 18-20% while guiding for a sharp margin recovery.
🐂 Bull Case
The $1.83 billion backlog, driven by a 141% surge in BASX orders, provides massive multi-year visibility and virtually guarantees double-digit growth into 2026.
The 787,000 sq ft Memphis facility reached profitability earlier than expected in Q4. As revenue scales against these fixed costs in 2026, margins are guided to rebound to 29-31%.
🐻 Bear Case
AAON is consuming cash at an alarming rate to fund this growth. 2025 Free Cash Flow was negative $190 million, forcing debt to spike to nearly $400 million.
Tulsa production missed internal targets in Q4, and the company has been forced to halt future ERP rollouts to protect output, highlighting ongoing operational friction.
⚖️ Verdict: 🟢
Bullish. While the destruction of operating cash flow is a glaring red flag, it is entirely driven by working capital needed to support a historic surge in data center demand. If management executes on their 2026 margin guidance, earnings will expand violently.
Key Themes
Operating Cash Flow Evaporates Amid Hyper-Growth
A major concern emerged on the cash flow statement. While GAAP Net Income was $107.6 million for FY25, Operating Cash Flow reversed violently from $192.5 million in 2024 to a mere $0.5 million in 2025. This specifically contradicts the positive earnings narrative. The cash was entirely consumed by a massive working capital build: Accounts Receivable grew by $167 million and Contract Assets jumped by $111.8 million to service massive, custom-engineered BASX liquid cooling orders.
BASX and the AI Data Center Boom
Accelerating. The BASX brand is the undisputed engine of the company. Fueled by surging macro demand for AI infrastructure, BASX-branded backlog surged 141.3% YoY to $1.30 billion. Q4 segment sales jumped 109.1% YoY to $106.1 million. The demand for customized air-side and liquid cooling equipment is transforming the company's total revenue profile.
Gross Margins Dragged Down by Scaling Costs
Stable but depressed. Consolidated Q4 gross margin sat at 25.9% (vs 26.1% YoY), reversing the sequential improvement seen in Q3 (27.8%). The AAON Oklahoma segment specifically saw margins contract to 27.5% from 30.7%, entirely driven by $6.4 million in incremental, unabsorbed overhead from bringing the new Memphis facility online.
Memphis Capacity Coming Online
The 787,000-square-foot Memphis facility has effectively doubled the company's production capacity for BASX equipment. While it acted as a heavy margin drag throughout 2025, management noted it 'reached profitability earlier than expected' in Q4, setting the stage for significant operating leverage in 2026.
Operational Stumbles at Legacy Plants and ERP Pauses
Reversing. After severe, quarter-wrecking SAP ERP-driven production halts at Longview earlier in 2025, the company has officially 'moderated the pace of near-term ERP rollouts.' While this protects near-term output, it prolongs the usage of fragmented legacy systems. Furthermore, management admitted production volumes at the legacy Tulsa facility were 'below plan' in Q4.
AAON Brand Recovers Ground
Accelerating. Despite softness in the broader commercial non-residential market, AAON-branded equipment sales grew 9.5% YoY in Q4 to $242.8 million—the strongest showing since Q2 2024. Its backlog also swelled 60.8% YoY to $526 million, proving the core rooftop business remains highly relevant.
Other KPIs
Accelerating. Margin expanded significantly from 16.1% YoY and 11.0% sequentially. This shows drastically improved operating leverage and throughput at the Longview facility, overcoming the ERP chaos from earlier in the year, even despite a 5-day year-end shutdown for inventory counts.
Accelerating debt load. Debt more than doubled from $138.9 million at the end of 2024. With operating cash flows at zero, the company leaned heavily on its revolving credit facility to finance a massive $190.5 million in capital expenditures and fund extreme working capital needs.
Guidance
Decelerating from the Q4 exit velocity of 42.5%, but represents stable, robust compounding on a much higher $1.44 billion base. The $1.83 billion backlog makes this guidance highly credible and de-risked.
Accelerating. A massive step up from 2025's actual 26.7% and Q4's 25.9%. Reaching this target relies heavily on the full absorption of fixed costs at the Memphis facility as data center production scales.
Stable compared to 16.2% for the full year 2025, and slightly higher than the 15.5% achieved in Q4 2025.
Accelerating significantly from $79.2 million in FY25, directly reflecting the immense $190 million in capital expenditures hitting the income statement as new manufacturing capacity comes online.
Key Questions
Working Capital Peak
With Operating Cash Flow flatlining at $0.5 million in 2025 due to massive working capital builds, at what specific point in 2026 do you expect these $111 million in contract assets to convert to cash?
Tulsa Bottlenecks
You noted that production volumes in Tulsa were 'below plan' in Q4. What specific bottlenecks caused this, and have they been fully resolved entering Q1 2026?
ERP Implementation Timeline
The pace of ERP rollouts has been moderated. What is the revised timeline for the remaining facilities, and what are the cost and efficiency implications of running dual, unintegrated systems for a longer period?
BASX Margin Profile
BASX segment gross margin was 27.1% in Q4. With Memphis reaching profitability faster than expected, do you foresee the BASX segment margins reaching parity with historical AAON Oklahoma margins (mid-30s) as volumes scale?