Below are highlights from Benzinga's daily coverage of small cap securities making big moves: Opexa Therapeutics Shares of Opexa Therapeutics (NASDAQ: OPXA ), the Woodlands, TX biopharmaceutical company rose 14.5% Tuesday on 3.5 times average volume. Opexa Therapeutics was the subject of a positive Seeking Alpha on Tuesday. Opexa Therapeutics closed at