NEW YORK ( TheStreet) -- The following stocks were upgraded last week by TheStreet Ratings: Vanguard Natural Resources (WNV), Pengrowth Energy (PGH), Lincoln National (LNC), Endurance Specialty Holdings (ENH), Covance (CVD), Brookdale Senior Living (BKD) General Growth Partners (GGP), Foster Wheeler (FWLT), PartnerRe (PRE), Talisman Energy (TLM), Forest Oil (FST), Icahn Enterprises (IEP), LyondellBasell Industries (LYB) and Teekay (TK).
Vanguard Natural Resources was upgraded to buy from hold at TheStreet Ratings on Wednesday.
TheStreet Ratings gives Vanguard Natural Resources a B grade. The stock closed Friday at $27.52 and has ticked down 11 cents, or 0.4% year to date.
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