NEW YORK ( TheStreet) -- Kirby (NYSE: KEX) is trading at unusually high volume Friday with 3.3 million shares changing hands. It is currently at eight times its average daily volume and trading up $1.46 (+2.2%) at $68.31 as of 3:25 p.m. ET. Kirby has a market cap of $3.76 billion and is part of the services sector and transportation industry. Shares are up 1.5% year to date as of the close of trading on Thursday. Kirby Corporation, through its subsidiaries, provides marine transportation and diesel engine services in the United States. The company operates in two segments, Marine Transportation and Diesel Engine Services. The company has a P/E ratio of 23.1, below the average transportation industry P/E ratio of 23.3 and above the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Kirby as a buy. The company's strengths can be seen in multiple areas, such as its robust revenue growth, solid stock price performance, compelling growth in net income, good cash flow from operations and impressive record of earnings per share growth. We feel these strengths outweigh the fact that the company is trading at a premium valuation based on our review of its current price compared to such things as earnings and book value. You can view the full Kirby Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center. Interested in other stocks that are rising on unusually high volume? Get free SMS text alerts sent to you when the action happens by texting HVUP to 95370 or select from multiple alert options.