Shares of Amentum Holdings, Inc. (AMTM) tumbled 5.65% in pre-market trading on Wednesday following the release of the company's second-quarter fiscal year 2025 results and updated guidance for the full year.

The advanced engineering and technology company reported second-quarter revenues of $3.5 billion, representing a modest 1% growth on a pro forma basis. Net income came in at $4 million, while adjusted EBITDA reached $268 million. Amentum's diluted earnings per share stood at $0.02, with adjusted diluted EPS at $0.53.

Despite reaffirming the mid-points of its prior guidance, Amentum slightly narrowed its fiscal year 2025 outlook. The company now expects revenues between $13,850 million and $14,150 million, compared to the previous range of $13,800 million to $14,200 million. The adjusted diluted EPS guidance remained unchanged at $2.00 to $2.20. Investors appear to be reacting negatively to the results and the tightened revenue guidance, leading to the significant pre-market decline.