Amentum Holdings Inc. (NYSE:AMTM) experienced a sharp after-hours plunge of 14.27% following the release of its first-quarter fiscal year 2026 results.
The company reported adjusted earnings per share of $0.54, which surpassed the analyst consensus estimate of $0.52. However, quarterly sales of $3.237 billion fell short of the $3.340 billion estimate and represented a 5.24% decrease compared to sales of $3.416 billion from the same period last year.
While the company reaffirmed its full-year guidance, the significant revenue miss and year-over-year decline appear to have driven investor sell-off in the extended trading session.