Amentum Holdings, Inc. (AMTM) experienced a significant intraday decline of 12.22% on Tuesday, reflecting strong selling pressure shortly after the market opened.

The sharp drop follows the company's release of its first-quarter fiscal 2026 earnings report. While Amentum's adjusted earnings per share of $0.54 exceeded Wall Street estimates, quarterly revenue of $3.24 billion fell short of analyst expectations and represented a 5.2% decline compared to the same period last year.

The revenue miss and year-over-year sales decrease appear to be the primary drivers behind the stock's sell-off, overshadowing the positive earnings performance and leading to investor concern about the company's top-line growth.