Flextronics (FLEX +8.4%) jumps after receiving an upgrade to Buy from Goldman. The firm notes Flextronics carries a free cash flow yield of 13% (maybe a little lower after today's move), and is raising its EPS estimates to account for rising margins and the impact of aggressive stock buybacks. BofA upgraded Flextronics on margin growth expectations in May. Also rallying: PLXS +3.6%. JBL +3%.