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Equities Research Analysts’ upgrades for Thursday, May 15th:

Acxiom (NASDAQ:ACXM) was upgraded by analysts at BMO Capital Markets from an underperform rating to a market perform rating.

BP plc (LON:BP) was upgraded by analysts at RBC Capital to an outperform rating. RBC Capital currently has GBX 530 ($8.93) target price on the stock.

BP plc (ADR) (NYSE:BP) was upgraded by analysts at RBC Capital from a sector perform rating to an outperform rating.

Catlin Group Limited (LON:CGL) was upgraded by analysts at Numis Securities Ltd to an add rating. Numis Securities Ltd currently has GBX 585 ($9.85) price target on the stock.

EarthLink (NASDAQ:ELNK) was upgraded by analysts at Oppenheimer from a market perform rating to an outperform rating.

EnLink Midstream Partners (NASDAQ:ENLK) was upgraded by analysts at Oppenheimer from a market perform rating to an outperform rating. They currently have $37.00 price target on the stock.

Facebook (NASDAQ:FB) was upgraded by analysts at Credit Suisse from a neutral rating to an outperform rating. The firm currently has $87.00 target price on the stock, up from their previous target price of $65.00.

Heartland Payment Systems (NYSE:HPY) was upgraded by analysts at Robert W. Baird from a neutral rating to an outperform rating. The firm currently has $47.00 price target on the stock.

Igas Energy (LON:IGAS) was upgraded by analysts at Westhouse Securities to a buy rating. The firm currently has GBX 174 ($2.93) price target on the stock, up from their previous price target of GBX 150 ($2.53).

Infinis Energy PLC (LON:INFI) was upgraded by analysts at Deutsche Bank to a buy rating. The firm currently has GBX 220 ($3.71) price target on the stock.

ITV plc (LON:ITV) was upgraded by analysts at Westhouse Securities to a buy rating. They currently have GBX 220 ($3.71) price target on the stock.

Kier Group plc (LON:KIE) was upgraded by analysts at Numis Securities Ltd to a buy rating. Numis Securities Ltd currently has GBX 2,125 ($35.79) target price on the stock.

Kinder Morgan (NYSE:KMI) was upgraded by analysts at Goldman Sachs from a buy rating to a conviction-buy rating.

Fidelity Southern Corp. (NASDAQ:LION) was upgraded by analysts at Keefe, Bruyette & Woods from a market perform rating to an outperform rating. They currently have $16.00 price target on the stock.

L-3 Communications Holdings (NYSE:LLL) was upgraded by analysts at Bank of America to a buy rating.

London Stock Exchange Group Plc (LON:LSE) was upgraded by analysts at Numis Securities Ltd to an add rating. Numis Securities Ltd currently has GBX 2,010 ($33.86) price target on the stock, up from their previous price target of GBX 1,881 ($31.68).

The Middleby (NASDAQ:MIDD) was upgraded by analysts at BB&T Corp. from a hold rating to a buy rating.

Norwegian Cruise Line Holdings (NASDAQ:NCLH) was upgraded by analysts at Goldman Sachs from a neutral rating to a buy rating. The firm currently has $37.00 target price on the stock.

Nimble Storage (NASDAQ:NMBL) was upgraded by analysts at Goldman Sachs from a neutral rating to a buy rating.

Parkway Properties (NYSE:PKY) was upgraded by analysts at Stifel Nicolaus from a hold rating to a buy rating.

Plug Power (NASDAQ:PLUG) was upgraded by analysts at Cowen and Company from a market perform rating to an outperform rating.

Pernix Therapeutics Holdings (NYSE:PTX) was upgraded by analysts at Needham & Company LLC from a buy rating to a strong-buy rating.

Regal Entertainment Group (NYSE:RGC) was upgraded by analysts at Topeka Capital Markets from a hold rating to a buy rating. They currently have $23.00 target price on the stock, up from their previous target price of $19.00.

Range Resources Corp. (NYSE:RRC) was upgraded by analysts at Goldman Sachs from a neutral rating to a conviction-buy rating.

Spirit Realty Capital, Inc (New) (NYSE:SRC) was upgraded by analysts at Ladenburg Thalmann from a neutral rating to a buy rating.

Steel Dynamics (NASDAQ:STLD) was upgraded by analysts at Cowen and Company from a market perform rating to an outperform rating. Cowen and Company currently has $24.00 price target on the stock.

Twitter (NYSE:TWTR) was upgraded by analysts at Atlantic Securities from an underweight rating to a neutral rating.

Zimmer Holdings (NYSE:ZMH) was upgraded by analysts at SunTrust from a neutral rating to a buy rating.

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