Shares of Block surged by 7% after being included in the S&P 500, following the announcement by S&P Global. Investors' optimism boosted the stock as passive index funds began purchasing an estimated 101 million shares, roughly 11 days of trading volume. Despite a year-to-date decline of 8%, Block’s market cap exceeds the median of the S&P 500. The company is working to rebuild trust after recent inconsistent results, reporting strong earnings and improved cash flow. The inclusion signals growing confidence in the fintech firm.