Sorry, I couldn't find pricing data for that day. The closing price for SPY on March 23, 2018 was $228.03. It was down 2.3% for the day. The latest price is $720.65.
| DATE | OPEN | HIGH | LOW | CLOSE | VOLUME |
|---|---|---|---|---|---|
March 23 2018 | $233.44 | $233.77 | $227.84 | $228.03 | 183,534,800 |
Daily pricing data for SPY dates back to 1/29/1993, and may be incomplete.