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 - Get Report), Foster Wheeler (FWLT), PartnerRe (PRE - Get Report), Talisman Energy (TLM - Get Report), Forest Oil (FST), Icahn Enterprises (IEP), LyondellBasell Industries (LYB) and Teekay (TK - Get Report).
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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