FTSE 100 wavers as investors wait for Yellen By: MarketWatch May 27, 2016 at 03:58 AM EDT U.K. stocks struggle to find a firm footing as investors waited to hear from Fed chief Janet Yellen, but the index is still on track for a weekly win. Read More >> Related Stocks: BP Plc ADR Rio Tinto Plc ADR Royal Dutch Shell Cl B ADR