Goldman nets a big payday for SpaceX IPO. Plus, what drove our winners and losers this week

Every weekday, the CNBC Investing Club with Jim Cramer releases the Homestretch — an actionable afternoon update, just in time for the last hour of trading on Wall Street. Stocks are trading higher Friday afternoon, with the S & P 500's gains pushing it firmly in positive territory for the week. That's quite the change after back-to-back losses on Tuesday and Wednesday, on the heels of last week's ugly finish . …