1. S&P 500 typically gains modestly on December Fed days, averaging 0.2%. 2. Last December's Fed meeting caused the largest decline for S&P on a Fed day. 3. Expectations for a 25 basis point rate cut are prevalent among investors. 4. S&P 500 has shown less volatility on recent Fed announcement days. 5. Current annual gain for S&P 500 is 16.4% year-to-date.