NEW YORK (TheStreet) -- Shares of Marathon Oil (MRO) - Get Report are down by 4.14% to $13.21 in late-morning trading on Wednesday, as oil prices dropped 2% earlier today as a result of an unexpected build up in crude and gasoline inventories. 

WTI crude is down by 1.86% to $42.12 per barrel on the New York Mercantile Exchange, while Brent crude is falling by 2.25% to $43.86 per barrel on the Intercontinental Exchange this morning. 

The stock build comes as a surprise during the peak summer driving season, Reuters reports.

Domestic crude stockpiles rose 1.7 million barrels, against analysts' forecasts for a decline of of 2.3 million barrels, according to the U.S. Energy Information Administration.

Houston-based Marathon Oil is an oil and gas exploration and production company operating in North America, Europe and Africa.

Separately, TheStreet Ratings objectively rated this stock according to its "risk-adjusted" total return prospect over a 12-month investment horizon. Not based on the news in any given day, the rating may differ from Jim Cramer's view or that of this articles's author. TheStreet Ratings has this to say about the recommendation:

We rate MARATHON OIL CORP as a Sell with a ratings score of D. This is driven by several weaknesses, which we believe should have a greater impact than any strengths, and could make it more difficult for investors to achieve positive results compared to most of the stocks we cover. The company's weaknesses can be seen in multiple areas, such as its poor profit margins, weak operating cash flow, generally disappointing historical performance in the stock itself, disappointing return on equity and feeble growth in its earnings per share.

You can view the full analysis from the report here: MRO

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