3 S&P 500 Stocks Plunge 25-37% in August 2025 Amid Earnings, Privacy Woes

As of September 5th, 2025, the S&P 500 index finished August on a high note, rising 1.91% and marking its fourth consecutive month of positive returns. However, not all stocks in the index fared as well. Three companies in particular - The Trade Desk, Super Micro Computer, and Gartner - experienced significant declines, losing between 25% to 37% of their value during the month.

The reasons behind these poor performances varied. The Trade Desk, a digital advertising firm, saw its revenue growth slow to 19% year-over-year, and its new chief financial officer took over after the previous one stepped down. Investors are also concerned that stricter privacy rules could hurt the company's targeted advertising business model.

Meanwhile, Super Micro Computer missed both revenue and earnings estimates in its fiscal fourth-quarter results, and the company also cut its fiscal 2026 guidance from $40 billion to $33 billion, disappointing investors. Gartner, a research and advisory firm, met analysts' estimates for the second quarter, but its total contract value growth slowed to just 4.9% year-over-year, leading the company to cut its 2025 revenue guidance.

Despite the broader market's positive performance, these three S&P 500 components struggled to maintain their momentum, highlighting the challenges faced by some of the index's constituents.