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Despite Market Gains, Top Stocks Plummet in 2025
19 Dec
Summary
- S&P 500 shows strong 16.81% YTD gain as of Dec. 5, 2025.
- Fiserv is the worst performer, down approximately 70% in 2025.
- Several well-known companies experienced significant stock declines.
As of December 5, 2025, the S&P 500 index has demonstrated a robust year-to-date gain of 16.81%. However, this average performance masks considerable individual stock downturns, with several prominent companies experiencing significant losses. Among the worst performers is Fiserv, whose stock plummeted approximately 70% by December 5. Factors contributing to this sharp decline included a reduced revenue forecast and slower growth in its merchant-services segment.
The digital advertising sector also saw major setbacks, with The Trade Desk down around 67%. Increased competition from major players like Amazon has impacted its revenues, leading investors to view the stock as overvalued due to diminished future earnings prospects. Similarly, Deckers Outdoor, known for its popular UGG and Hoka brands, has fallen approximately 57% amid concerns over slowing growth and reduced consumer spending on discretionary items.
