If history is any guide, the incredible run in Robinhood stock this year probably isn't sustainable.The S&P 500 (^GSPC 0.41%) is made up of 500 companies from 11 different sectors of the economy. To be considered for a spot in the index, there are multiple criteria, including that companies must have a market capitalization of at least $22.7 billion and must be profitable. But even after ticking those boxes, a special committee ultimately decides which candidates make the cut.The S&P 500 is rebalanced once ...

Core Insights - Interactive Brokers has executed a 4-for-1 stock split, increasing its share count and reducing the price per share to make it more accessible to retail investors [2][12] - The company has seen significant growth in customer base and trading activity, with a record 3.87 million customers, a 32% increase year-over-year [5][14] - The elevated market volatility has led to a 49% year-over-year increase in daily active revenue trades (DARTs) and a 34% increase in customer equity, reaching $664.6 billion [7][8] Financial Performance - Interactive Brokers generated $1.48 billion in total revenue during the second quarter, a 20% increase from the previous year [9] - Commission revenue was $516 million, up 27% year-over-year, while net interest revenue was $860 million, reflecting a 9% increase [15] - The company reported earnings per share (EPS) of $0.51 for the second quarter, a growth of 24%, leading to a trailing-12-month EPS of $1.94 [12][13] Market Position - The stock has appreciated over 700% since its IPO in 2007, translating to a compound annual return of 12.5%, outperforming the S&P 500's average annual return of 10.1% [13][14] - Despite a higher price-to-earnings (P/E) ratio of 32 compared to the S&P 500's 24.7, the premium valuation may be justified due to consistent performance [13] - The company is well-positioned for long-term growth, with quarterly customer growth of at least 30% for the past three quarters [14]