Why Is AAR CORP (AIR) Stock Moving Today?

Why AIR stock is down today

AAR Corp stock fell 7.25% to $106.75 in a single session, driven primarily by the announcement that the company has agreed to acquire a 65% controlling stake in Panama-based MRO Holdings for $1.8 billion. The acquisition, disclosed on September 28, 2026, overshadowed the company's strong Q1 2027 earnings report, which included 24% sales growth and a raised outlook. The stock's decline reflects investor concerns about the financial implications of the deal and the timing of its expected closure in fiscal Q3 2027.

What Happened

AAR Corp reported excellent Q1 2027 earnings, with record cash flow and a raised full-year outlook. The company also announced a target to achieve 19% to 20% adjusted EBITDA margins within three to four years. However, the stock declined sharply after the company disclosed its agreement to acquire a controlling interest in MRO Holdings. The acquisition is expected to expand AAR's aircraft maintenance capabilities but will require significant capital. The market appears to be reacting to the near-term financial burden and uncertainty surrounding the integration of the new asset.

What The Data Shows

The stock has traded within a 52-week range of $76.10 to $154.00 and currently has a market cap of $4.6 billion. The stock has declined 4.1% over the last eight sessions, moving from $112.77 to $108.11. On September 29, the stock printed one fresh 52-week high and 17 fresh 52-week lows. The P/E ratio stands at 23.7, with trailing 12-month revenue up 19.0%. The stock has a beta of 1.11, indicating moderate volatility relative to the market.

What To Watch

AAR's next earnings report will be a key event to monitor, as will the progress of the MRO Holdings acquisition. Investors should also track coverage breadth, as 20 stories from nine sources have appeared in the last 36 hours, indicating heightened attention to the stock.