Among Charlton Aria Acquisition Corporation Class A Ordinary Shares (CHAR) and Bitcoin (BTC), Bitcoin (BTC) had the best day on September 15, 2010, returning 31.9%.
The highest closing price for Bitcoin (BTC) in a month all-time was $116,468.51, this month. It is up 7.6% for the month. The latest price is $117,299.21.
Sorry, I couldn't find pricing data for that day. The closing price for the S&P 500 (GSPC) on April 4 was $5,074.08. It was down 4.1% for the day. The latest price is $6,715.79.