AAON's Record Growth Masks Margin Compression as Data Center Ramp Accelerates

Q2 sales surge 101% but gross margin falls to 24.3%; full-year guidance raises revenue, cuts margin

AAON · Earnings Call · 2026-08-10

The Growth Engine: BASX and the Data Center Tidal Wave

AAON, Inc. is in the midst of the most dramatic growth phase in its history, yet the stock has been in freefall. The Q2 2026 earnings call revealed a company operating at full throttle: revenue up 101% year-over-year, a fourth consecutive quarterly record, and Memphis site production scaling faster than expected. The BASX brand, the company's data center cooling arm, saw sales surge 216% YoY, with management explicitly tying the outlook to the data center space being “as strong as it's ever been.” The pipeline remains robust, but investors are focused on what that growth is costing.

We are not simply growing revenue. We are building a stronger operating company with scale, infrastructure, systems and discipline to support higher revenue, stronger execution, improved margins, greater cash generation and durable earnings growth over time.
Matthew Tobolski, Chief Executive Officer · 2026-08-10

Yet the tape tells a different story. The stock has dropped 46% from its June peak, even as fundamentals show gross margin collapsed from 36.2% in 2024 to 24.3% this quarter, a slide that accelerated as the Memphis ramp-up began to consume capital and outsource production.

The Margin Dilemma: Mix, Ramp, and Price/Cost Timing

The margin squeeze is the central narrative. Management was candid about the drivers: the inflationary pressure on raw materials and freight, a deliberate increase in outsourcing, and the negative mix effect of lower-margin Memphis volume. As CFO Andy Cheung noted, adjusted EBITDA still grew 102% YoY, but adjusted EBITDA margin was flat at 15.0% — a stark contrast to the revenue growth. The company had previously guided to 27-28% gross margin for the year; it now sees 25-26%. “Consolidated margins remain pressured by the mix impact of exceptionally strong growth, ramp-up activity associated with new capacity and price/cost timing dynamics.” — Matthew Tobolski, Chief Executive Officer · 2026-08-10 This is a textbook case of a company sacrificing near-term margin to secure market share and build long-term capacity — a bet that may or may not pay off. The backlog conversion is accelerating, but the stock market is treating the margin guidance cut as a signal of weakening pricing power.

Guidance Revision and the Market's Reaction

Management raised full-year sales growth to 55-60% (from 40-45%) but slashed gross margin guidance to 25-26%. This revision, combined with the BASX bookings slowdown versus the prior quarter's “book-to-bill approaching 3,” triggered a sharp selloff. As Matt Tobolski explained, the order lumpiness is not a demand problem, but investors are cautious about the sustainability of the ramp. “We've seen acceleration in conversations and activity with our sales channel and engagement in the overall market.” — Matthew Tobolski, Chief Executive Officer · 2026-08-10 The company's own supply chain challenges — including fan availability and component shortages — remain a persistent risk, though management insists in-sourcing efforts are mitigating the impact.

Prior Signal vs. New Reality

Just three months ago, the tone was more confident on margins. In the May call, Tobolski said the company was on track for 27-28% gross margin, attributing the slide to “temporary” outsourcing costs. The Q2 numbers, however, show the problem is more structural — the Memphis facility alone absorbed $18.1 million in overhead, versus $3 million a year ago. The guidance cut is a clear acknowledgment that the margin recovery will take longer than initially hoped. “we made the choice to accelerate some of the productivity or production ramp, which is part of that additional cost structure that came in on the outsourcing.” — Matthew Tobolski, Chief Executive Officer · 2026-05-07 That choice is now playing out in the stock's 46% drawdown. The company is executing well on volume, but the market is questioning whether the margin profile can ever return to the 30%+ levels that once justified a premium valuation. With price-to-earnings still above 57x, any continued margin disappointment could lead to further de-rating. “We now expect sales growth of 55% to 60%, gross margin of 25% to 26%...” — Matthew Tobolski, Chief Executive Officer · 2026-08-10 The full-year guidance implies a back-half gross margin pick-up, but management was clear that the biggest improvement comes in Q4. For now, the market is voting with its feet, and AAON's path to margin normalization will determine whether this growth story regains credibility.