Roku Inc's ROKU.O shares fell 3.3% as the streaming platform said it plans to cut 200 jobs. By Ankika Biswas and Amruta Khandekar Nov 17 (Reuters) - U.S. stock indexes fell on Thursday as mixed economic data and hawkish comments from a Federal Reserve official fueled concerns that the central bank may not ease its aggressive policy tightening. Bullard's comments come as strong retail sales numbers on Wednesday stoked concerns that the Fed would keep raising borrowing costs, even as evidence of cooling inflation gives the central bank room to reduce the size of its rate hikes.