Robinhood Markets ( HOOD 3.27%) had a scorching 2025 in the first few months of the year, and it continued to barrel ahead in May. The online brokerage's shares saw their value rise almost 35% across the month,

AppLovin and Interactive Brokers are among the largest companies by market cap that still aren’t in the benchmark index.

An announcement of any changes to the S&P 500 index components is likely to come around 5:15 p.m. ET on Friday. Any additions and subtractions to the index likely would take effec