US stocks open mildly lower after CPI; Yellen eyed By: CNBC.com News May 22, 2015 at 09:30 AM EDT U.S. stocks opened mildly lower on Friday as investors digested a strong core inflation figure ahead of Fed Chair Janet Yellen's afternoon speech. Read More >> Related Stocks: Amtd Idea Group Campbell Soup Deere & Co Footlocker Inc Hewlett-Packard Sentinelone Inc Cl A