Biggest Earnings Misses & Beats: Stock Market's Wildest Swings

The stock market frequently experiences significant swings around earnings reports, with both dramatic drops after misses and substantial surges after beats, often driven by the 'buy the rumor, sell the news' phenomenon.

The top 3

  1. Companies with the Largest Post-Earnings Stock Drops: While specific company names for the absolute largest post-earnings drops vary, historical data shows that among companies beating EPS estimates, 45-50% still trade lower the next day, indicating that beating numbers alone is often insufficient.
  2. Companies with the Biggest Post-Earnings Stock Surges: Companies that consistently post positive earnings surprises, exceeding analyst estimates, tend to see their share prices climb, with some studies showing an average gain of 1.24% in the four-day window around the announcement for S&P 500 components.
  3. Historical Examples of 'Buy the Rumor, Sell the News': The 'buy the rumor, sell the news' phenomenon describes when stock prices rise in anticipation of good news, then fall once the news is officially confirmed, as the positive expectations are already 'priced in' and early investors sell to take profits.

Sources

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