Helius Medical Technologies, Sunrun And Other Big Stocks Moving Lower In Tuesday's Pre-Market Session

U.S. stock futures were mixed this morning, with the Dow futures falling around 0.1% on Tuesday. Shares of Helius Medical Technologies, Inc. (NASDAQ:HSDT) fell sharply in today's pre-market trading. Helius Medical Technologies filed prospectus for $25 million share offering. Helius Medical…