AAON, INC. 2025 Annual Report (10-K) Summary
Business Context and Reporting Period
This filing covers the fiscal year ended December 31, 2025. AAON, Inc. is a leader in heating, ventilation, air conditioning (HVAC), and liquid cooling solutions for commercial, industrial, and data center environments. The company operates through three reportable segments: AAON Oklahoma (commercial/industrial HVAC), AAON Coil Products (coils and semi-custom systems), and BASX (high-performance data center and cleanroom cooling). The company serves primarily the domestic U.S. market, with foreign sales representing approximately 2.6% of net sales in 2025.
Key Financial Metrics
| Metric | 2025 | 2024 | Change |
|---|---|---|---|
| Net Sales | $1,442.1 million | $1,200.6 million | +20.1% |
| Gross Profit | $385.7 million | $397.1 million | -2.9% |
| Gross Margin | 26.7% | 33.1% | -640 bps |
| Operating Income | $146.2 million | $209.1 million | -30.1% |
| Net Income | $107.6 million | $168.6 million | -36.2% |
| Diluted EPS | $1.29 | $2.02 | -36.1% |
| Operating Cash Flow | $0.5 million | $192.5 million | Significant Decrease |
| Capital Expenditures | $190.6 million | $195.7 million | -2.6% |
| Total Debt (Long-term) | $398.3 million | $138.9 million | +186.7% |
| Available Liquidity (Revolver) | $201.0 million | $123.2 million | +63.2% |
| Backlog | $1,828.5 million | $867.1 million | +110.9% |
Material Changes vs. Prior Period
- Revenue Mix Shift: Total revenue grew 20.1%, driven almost entirely by the BASX segment (up 59.3% to $315.5 million) and AAON Coil Products (up 126.1% to $325.4 million). Conversely, the core AAON Oklahoma segment declined 6.7% to $801.2 million due to softer commercial construction markets and supply chain constraints.
- Margin Compression: Gross margin contracted from 33.1% to 26.7%. This was caused by lower volume absorption in the AAON Oklahoma segment, the impact of a new Memphis facility (overhead costs allocated to AAON Oklahoma while sales credited to BASX), and ERP implementation disruptions at the Longview, Texas facility.
- Cash Flow Volatility: Operating cash flow dropped dramatically to $0.5 million from $192.5 million. This was primarily due to significant increases in working capital requirements, specifically a $167 million increase in accounts receivable and a $112 million increase in contract assets, driven by the funding of large BASX data center projects.
- Debt Utilization: The company significantly increased borrowings under its revolving credit facility (from $76.5 million to $398.3 million) to fund working capital needs and capital expenditures. The revolver capacity was expanded to $600 million.
- Backlog Surge: Backlog more than doubled to $1.83 billion, with BASX-branded products accounting for the majority of the increase ($1.3 billion), reflecting strong demand for data center liquid cooling solutions.
Guidance, Outlook, and Risks
- Outlook: Management expects the commercial construction market to remain soft but stabilizing. The data center market (BASX) continues to show strength with no meaningful signs of slowing, driven by AI and high-performance computing demand.
- Capital Expenditures: The company estimates 2026 capital expenditures to be approximately $190 million, focused on infrastructure and machinery to support production growth.
- Key Risks:
- Supply Chain & Tariffs: Exposure to raw material price volatility (copper, steel) and potential cost increases from international tariffs. A 6% surcharge was implemented in April 2025 to offset tariff impacts.
- ERP Implementation: Ongoing risks related to the implementation of a new global Enterprise Resource Planning (ERP) system, which caused production disruptions in 2025.
- Customer Concentration: Three customers accounted for over 10% of revenue in 2025. The loss of a major customer could materially impact results.
- Regulatory Changes: Transition to new refrigerants (R-454B) required in 2025 and future state-level regulations (e.g., New York) requiring lower global warming potential refrigerants by 2034.
- Unusual Items: The company incurred a $7.5 million settlement related to Havtech litigation in 2023 (fully paid). In 2025, the company recognized a $0.8 million increase in tax provision expense due to the enactment of the "One Big Beautiful Bill Act" (OBBBA), which altered bonus depreciation and R&D expensing rules.
Investor Verification Checklist
- Working Capital Efficiency: Verify the sustainability of the $167 million increase in accounts receivable and the ability to convert the $1.8 billion backlog into cash flow without further straining liquidity.
- ERP Stabilization: Confirm that production disruptions related to the ERP implementation at Longview and Memphis have fully resolved and that margins are recovering.
- Debt Covenants: Monitor the leverage ratio (currently 1.77x) to ensure continued compliance with the 3.0x covenant limit as debt levels remain elevated.
- BASX Growth Sustainability: Assess the durability of the data center market demand and the company's ability to maintain high backlog levels without significant order cancellations or deferrals.
- Margin Recovery: Track gross margin trends in the AAON Oklahoma segment to determine if the margin compression is temporary (due to volume/ERP) or structural.