NEW YORK (TheStreet) -- Shares of Marathon Oil (MRO - Get Report) were falling in mid-afternoon trading on Friday as oil prices retreated.

Crude oil (WTI) was down 0.81% to $50.03 per barrel while Brent crude was falling 0.71% to $51.66 per barrel this afternoon.

Earlier today, Baker Hughes (BHI) reported that U.S. drillers added four rigs this week to total 432 units drilling for oil.

The number of active U.S. rigs has grown for 15 out of the past 16 weeks.

Additionally, the Energy Information Administration said yesterday that U.S. crude stockpiles grew by 4.9 million barrels last week to total 474 million barrels. Analysts had been looking for a 700,000 barrel build for the week, according to Reuters.

U.S. crude inventories increased this week for the first time in six weeks.

Marathon is a Houston-based oil exploration and production company.

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 rated this stock as a "sell" with a ratings score of D.

The company's weaknesses can be seen in multiple areas, such as its weak operating cash flow, generally disappointing historical performance in the stock itself and disappointing return on equity.

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