Levi & Korsinsky, LLP announces that it has commenced an investigation of Knight Transportation Inc. ("Knight" or "the Company") (NYSE:KNX) concerning possible violations of federal securities laws by the Company and/or certain of its officers and directors. On December 17, 2015, the Company lowered its fourth quarter earnings per diluted share to a range of $0.31 to $0.33, compared to its prior estimates of $0.36 to $0.38 per share. Shares of Knight were down more than 5% on intraday trading on December 18, 2015. To obtain additional information about the investigation, go to: http://zlk.9nl.com/knight-transportation-knx or contact Joseph E. Levi, Esq. either via email at email@example.com or by telephone at (212) 363-7500, toll-free: (877) 363-5972. Levi & Korsinsky is a national firm with offices in New York, New Jersey, California, Connecticut, and Washington D.C. The firm's attorneys have extensive expertise and experience representing investors in securities litigation involving financial fraud, and have recovered hundreds of millions of dollars for aggrieved shareholders. Attorney advertising. Prior results do not guarantee similar outcomes.