StockStory Flags Tenable (TENB), Advanced Energy (AEIS), United Airlines (UAL) Over Margin, Valuation Concerns

Research firm StockStory on May 29, 2026, identified three profitable companies—Tenable, Advanced Energy, and United Airlines—as stocks to avoid, citing low operating margins and elevated valuations. Tenable (TENB) reported a trailing 12-month GAAP operating margin of 1.7% and trades at 2.6 times forward sales. Advanced Energy (AEIS) posted a 10.8% margin but carries a forward P/E of 32.9. United Airlines (UAL) recorded an 8.4% margin and a forward P/E of 12.5. The warnings underscore that current profitability does not guarantee investment quality. The firm emphasized that companies with thin margins or stretched valuations may face headwinds, limiting future returns. StockStory separately flagged five unnamed growth stocks with strong revenue momentum as alternatives, but the report focused on risks for these three names.