The closing price for Berkshire Hathaway (BRK.A) in October 1987 was $3,325, on October 30, 1987. It was down 20.5% for the month. The latest price is $615,900.

Theriva Biologics (TOVX) had the highest return in June 2006 by a US stock, returning 1,500%.

The closing price for Bitcoin (BTC) last month was $63,329.50, on September 30. It was up 7.4% for the month. The latest price is $68,378.

NVIDIA (NVDA) had the highest return between 2014 and 2018 by a US stock in the S&P 500 (GSPC), returning 782%.

NVIDIA (NVDA) had the highest return between 2014 and 2017 by a US stock in the S&P 500 (GSPC), returning 1,174.5%.

Keurig Dr Pepper (KDP) had the highest return between June 1, 2007 and December 31, 2008 by a US stock in the S&P 500 (GSPC), returning 259.2%.

The closing price for UnitedHealth (UNH) in January 2017 was $144.52, on January 31, 2017. It was up 0.6% for the month. The latest price is $591.24.

The closing price for Automatic Data Processing (ADP) in December 2013 was $56.30, on December 31, 2013. It was up 1.7% for the month. The latest price is $269.56.

On January 31, 2017, UnitedHealth (UNH) had a market capitalization of $141.4B, based on 975M shares at a price of $145.04.

On January 31, UnitedHealth (UNH) had a market capitalization of $466.3B, based on 922M shares at a price of $505.78.

Versus Systems Inc. (VS) had the highest return in July 2006 by a US stock, returning 433.3%.

Sorry, I couldn't find pricing data for that day. The closing price for Walt Disney (DIS) yesterday was $87.94. It was down 0.6% for the day.

Keurig Dr Pepper (KDP) had the highest return between June 1, 2007 and December 31, 2009 by a US stock in the S&P 500 (GSPC), returning 528.9%.

Caesars Entertainment (CZR) had the highest return between 2015 and 2018 by a US stock in the S&P 500 (GSPC), returning 754%.

XTI Aerospace (XTIA) had the highest return between June 1, 2007 and December 31, 2009 by a US stock, returning 666,666,566.6%.