Pre-Open Movers 6/21: (TOBC) (BBY) (MDR) Higher; (WAG) (ESRX) (PSEC) Lower (more...)

Below are stocks making notable moves in pre-open trading:

HIGHER:
Tower Bancorp Inc. (Nasdaq: TOBC) 34% HIGHER; Susquehanna to acquire the company
Best Buy Co. Inc. (NYSE: BBY) 4% HIGHER; buyback, dividend news
McDermott International Inc. (NYSE: MDR) 3% HIGHER; new Buy rating
Renren Inc. American Depositary (Nasdaq: RENN) 3% HIGHER; Q1 earnings
BP plc (BP) 3% HIGHER; reached a settlement with Weatherford related to the Deepwater Horizon incident.
Weatherford International (NYSE: WFT) 2% HIGHER; reached a settlement with BP related to the Deepwater Horizon incident.
Synchronoss Technologies, Inc. (Nasdaq: SNCR) 2% HIGHER; upgraded
Biogen Idec Inc. (Nasdaq: BIIB) 2% HIGHER; upgraded
Discover Financial Services (NYSE: DFS) 1% HIGHER; upgraded
Aruba Networks, Inc. (Nasdaq: ARUN) 1% HIGHER; new Buy rating

LOWER:
Walgreen Co. (NYSE: WAG) 6% LOWER; Q3 results, ends deal with Express Script
Prospect Capital Corporation ((Nasdaq: PSEC) 5% LOWER; stock offering
Achillion Pharmaceuticals, Inc. (Nasdaq: ACHN) 5% LOWER; stock offering
Motorola Mobility Holdings, Inc. (NYSE: MMI) 4% LOWER; downgraded
Express Scripts Inc. (Nasdaq: ESRX) 3% LOWER; Walgreen ends deal
Susquehanna (Nasdaq: SUSQ) 2% LOWER; to acquire Tower Bancorp
Invesco Mortgage Capital Inc. (NYSE: IVR) 2% LOWER; stock offering

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