Shares of gourmet burger chain Red Robin (NASDAQ: RRGB) were slammed earlier this month when the company reported preliminary second-quarter results in an effort to be timely and transparent about a period that was "significantly" worse than expected, according to Red Robin CEO Denny Marie Post. Shares slid about 20% as adjusted earnings per share came in well below the company's guidance range.The preliminary second-quarter update, which included figures that are subject to quarter-end closing adjustments, gave investors some insight into the period.