NEW YORK ( TheStreet) -- Tam (NYSE: TAM) is trading at unusually high volume Wednesday with 4.2 million shares changing hands. It is currently at 4.2 times its average daily volume and trading down 56 cents (-2.7%) at $20.01 as of 3:40 p.m. ET. Tam has a market cap of $3.2 billion and is part of the services sector and transportation industry. Shares are down 15.5% year to date as of the close of trading on Tuesday. TAM S.A., through its subsidiaries, provides passenger and cargo air transportation services in Brazil and internationally. The company also engages in aircraft sub-leasing, as well as aircraft acquisition, financing, and debt issuance activities. The company has a P/E ratio of 12.4, above the average transportation industry P/E ratio of 4.9 and below the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Tam as a hold. The company's strengths can be seen in multiple areas, such as its robust revenue growth, notable return on equity and reasonable valuation levels. However, as a counter to these strengths, we also find weaknesses including generally poor debt management, poor profit margins and weak operating cash flow. You can view the full Tam 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 falling on unusually high volume? Get free SMS text alerts sent to you when the action happens by texting HVDOWN to 95370 or select from multiple alert options.