Block (XYZ) shares surged close to 10% in extended trading Friday after S&P Dow Jones Indices said the digital payments ...

Block jumped after being tapped to join the S&P 500, a move that sets the stage for index investors to buy the stock.

What happenedShares of fintech giant Block ... Block stock is down 5%. Image source: Getty Images. ... and new questions about Block's ability to hit even that growth number, Block stock isn't ...