 Turtle Beach Corp.s HEAR, -0.99 board decided not to sell the company for now, and shares plunged more than 30 in after-hours trading Monday as the company revealed worse than expected financial results and reduced its annual guidance. Leaders of the company, which sells headphones made for videogame systems as well as other gaming gear, had talks with 109 parties in a previously announced review of strategic alternatives, but could not find a buyer for now, according to a Monday afternoon announcement. 