The highest closing price for Costco Wholesale (COST) in 2021 was $544.86, on December 29, 2021. It was up 51.6% for the year. The latest price is $899.19.
Soleno Therapeutics (SLNO) had the highest return between August 1, 2023 and September 30, 2023 by a mid-cap US stock or mid-cap US stock, returning 490.2%.