Why Is AMENTUM HLDGS INC EQ (AMTM) Stock Down Today?

Amentum Holdings Inc (AMTM) fell 10.30% to $21.94 in a sharply lower session driven by a revenue miss in its third quarter and a downward revision to full-year sales guidance. The stock opened with a 7.1% gap down and continued to decline throughout the morning, reaching a session low of $21.86. The company reported Q3 revenue of $3.5 billion, below the $3.86 billion estimate and down 1.7% year-over-year. While adjusted earnings per share of $0.67 beat the $0.61 forecast, the earnings result failed to offset the disappointment from the revenue shortfall. Amentum also revised its FY2026 revenue guidance to a range of $13.8 billion to $13.95 billion, below the $14.14 billion estimate.

What Happened

Amentum’s Q3 report included a non-GAAP EPS of $0.67, in line with the updated guidance of $2.40 to $2.50 for the full year. However, the revenue result and the updated sales forecast were seen as underwhelming by investors. The company cited a $360 million revenue miss and a weaker-than-expected top line. The stock’s sharp decline began immediately after the market opened, with the price dropping from $22.70 to $21.86 within 10 minutes. The 8-K filing on August 10, which included the results and financial statements, preceded the market reaction. The Fly and StockTitan highlighted the EPS beat and raised guidance, but the revenue shortfall dominated the investor sentiment.

What The Data Shows

The intraday session showed a weak start and continued downward pressure, with volume at 0.3 million shares, or 0.1 times the 3-month average. The stock is trading at 41.3 times earnings and has a market cap of $5.8 billion. The 52-week range is $19.80 to $38.11, and the current price is near the lower end of that range. The trailing 12-month revenue growth is 26.1%, but the net margin of 1.0% suggests ongoing pressure on profitability. The session’s trajectory and the volume level indicate a lack of immediate buyer interest, with the stock trending toward oversold territory.

What To Watch

Amentum’s updated FY2026 guidance and the Q3 earnings call will be key to understanding the path forward. Investors will monitor the company’s ability to address the revenue shortfall and whether the raised EPS outlook can restore confidence. The stock’s performance in the coming weeks will likely depend on follow-through from the earnings report and broader market conditions.