Sorry, I couldn't find pricing data for that day. The closing price for the S&P 500 (GSPC) on June 29, 2012 was $1,362.16. It was up 2.4% for the day. The latest price is $5,700.65.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
June 29 2012
$1,330.12
$1,362.17
$1,330.12
$1,362.16
4,590,480,000
Daily pricing data for the S&P 500 dates back to 12/30/1927, and may be incomplete.