NEW YORK ( TheStreet) -- Overseas Shipholding Group (NYSE: OSG) is trading at unusually high volume Monday with 3.5 million shares changing hands. It is currently at 4.6 times its average daily volume and trading down $1.36 (-9.9%) at $12.38 as of 4:01 p.m. ET. Overseas Shipholding Group has a market cap of $460 million and is part of the services sector and transportation industry. Shares are down 61.2% year to date as of the close of trading on Friday. Overseas Shipholding Group, Inc., a tanker company, primarily engages in the ocean transportation of crude oil and petroleum products. TheStreet Ratings rates Overseas Shipholding Group as a sell. The company's weaknesses can be seen in multiple areas, such as its disappointing return on equity, poor profit margins, weak operating cash flow, generally disappointing historical performance in the stock itself and feeble growth in its earnings per share. You can view the full Overseas Shipholding Group 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.