Sorry, I couldn't find pricing data for that day. The closing price for the S&P 500 (GSPC) on December 31, 2018 was $2,506.85. It was up 0.3% for the day. The latest price is $5,815.03.
| DATE | OPEN | HIGH | LOW | CLOSE | VOLUME |
|---|---|---|---|---|---|
December 31 2018 | $2,498.94 | $2,509.24 | $2,482.82 | $2,506.85 | 3,442,870,000 |
Daily pricing data for the S&P 500 dates back to 12/30/1927, and may be incomplete.
