ABM Industries is trading 21.57% down at $38.77 after no clear company-specific catalyst was identified for September 22, 2026. - The latest reported event was fiscal third-quarter earnings on September 8, showing record revenue, stronger adjusted earnings, and raised cash-flow expectations, making it unlikely to explain this sudden decline two weeks later. - The broader pre-market tape is mixed to modestly firmer, so market-wide weakness does not explain the move. - Thin pre-market liquidity or an unreported catalyst may explain the decline and requires confirmation.