The closing price for Catalyst Pharmaceuticals (CPRX) in June 2011 was $1.88, on June 30, 2011. It was up 59.3% for the month. The latest price is $20.79.
Sorry, I couldn't find pricing data for that day. The closing price for the Dow Jones Industrial Average (DJI) on July 29, 2016 was $18,432.24. It was down 0.1% for the day.
Magna International (MGA) had the highest return between February 10, 1991 and December 15, 1991 by a US stock with a market cap of $10B+, returning 322.6%.
374Water Inc Common Stock (SCWO) had the highest return between June 1, 2011 and June 30, 2011 by a US stock with a market cap of $100M+, returning 196.1%.
Jack Henry & Associates (JKHY) had the highest return between February 10, 1991 and December 15, 1995 by a US stock with a market cap of $10B+, returning 1,974.9%.