Also see: NYSE, Primerica: New Targets, EstimatesNEW YORK ( TheStreet) -- CHANGE IN RATINGS Arthur J. Gallagher ( AJG) was upgraded at Sterne Agee from Neutral to Buy. $33 price target. Stock has underperformed its peers this year, despite posting solid core earnings, Sterne Agee said. Aruba Networks ( ARUN) was upgraded from Neutral to Outperform at Wedbush. $30 price target. Stock has pulled back and has premier growth potential, Wedbush said. AptarGroup ( ATR) was upgraded at Keybanc from Hold to Buy. $60 price target. Company should continue to deliver solid organic growth, Keybanc said. Celanese ( CE) was downgraded at Morgan Stanley to Equal-weight. Company is leveraged to potential slower growth in China and weaker acetyls margins, Morgan Stanley said. $55 price target. Cliffs Natural Resources ( CLF) was initiated with a Buy rating at UBS. $122 price target. Company can deliver solid cash flow growth, UBS said. LinkedIn ( LNKD) was initiated with an Equal-Weight rating at Evercore Partners. Valuation call, based on a $70 price target, Evercore said. Molson Coors ( TAP) was downgraded at Stifel Nicolaus from Buy to Hold. Company would be paying a hefty premium for its stake in Foster's, Stifel Nicolaus said. Nokia ( NOK) was downgraded at Wunderlich from Buy to Hold. Lower profits will hurt the company's balance sheet, Wunderlich said. Praxair ( PX) was upgraded at Morgan Stanley from Underweight to Equal-Weight. $112 price target. Estimates also boosted, given better expected hydrogen growth, Morgan Stanley said. Ryder System ( R) was upgraded at Keybanc from Hold to Buy. $63 price target. Company could see a multiyear recovery in vehicle leasing, Keybanc said. Transocean ( RIG) was upgraded at Argus Research from Hold to Buy. $85 price target. Stock yields 5% and offers an attractive risk/reward at current levels, Argus said. RPX Corp. ( RPX) was rated new Equal-Weight at Barclays. Valuation call, based on a $34 price target, Barclays said. Stericycle ( SRCL) was upgraded from Underperform to Neutral at Bank of America/Merrill Lynch. $88 price target. Company is facing less competition from WM, BofA/Merrill said. TTM Technologies ( TTM) was upgraded at Needham from Buy to Strong Buy. Stock is a leader and trading at a discount to its peers, Needham said. Universal Health ( UHS) was upgraded to Outperform at Leerink Swann. Stock is attractive following a recent pullback, Leerink Swann said.