Amentum Holdings, Inc. (AMTM) shares plummeted 9.12% in after-hours trading following the release of its fiscal third-quarter 2026 results, which revealed revenues that fell short of analyst expectations.

The company reported quarterly revenue of $3.49 billion, missing the IBES estimate of $3.572 billion. This top-line miss appeared to overshadow other metrics, including adjusted EBITDA of $290 million, net income of $66 million, and earnings per share of $0.27.

The stock's sharp decline reflects investor disappointment with the revenue shortfall, as the broader earnings report otherwise showed operating income of $172 million and free cash flow of $135 million.