Top Analyst Upgrades and Downgrades (ATVI, CELG, COST, EA, ECPG, HST, LEAP, MAR, PCS, PAL, SI, SPLS, TTWO, TCBI, TXN, ZNGA)

Activision Blizzard Inc. (NASDAQ: ATVI) started as Outperform with $16 target at Credit Suisse.

Celgene Corp. (NASDAQ: CELG) cut to Neutral at Piper Jaffray.

Costco Wholesale Corp. (NASDAQ: COST) reiterated Buy and raised target to $113 at Argus.

Electronic Arts Inc. (NASDAQ: EA) started as Neutral at Credit Suisse.

Encore Capital Group Inc. (NASDAQ: ECPG) named value stock of the day at Zacks.

Host Hotels & Resorts Inc. (NYSE: HST) cut to Neutral at Goldman Sachs.

Leap Wireless International Inc. (NASDAQ: LEAP) raised to Outperform at Oppenheimer.

Marriott International Inc. (NYSE: MAR) cut to Neutral at Goldman Sachs.

MetroPCS Communications Inc. (NYSE: PCS) cut to Underperform at Oppenheimer.

North American Palladium Ltd. (NYSEMKT: PAL) raised to Outperform at Credit Suisse.

Siemens A.G. (NYSE: SI) cut to Hold at Deutsche Bank.

Staples Inc. (NASDAQ: SPLS) named Bear of the Day at Zacks.

Take-Two Interactive Software Inc. (NASDAQ: TTWO) started as Neutral at Credit Suisse.

Texas Capital Bancshares Inc. (NASDAQ: TCBI) named as Bull of the Day at Zacks.

Texas Instruments Inc. (NASDAQ: TXN) cut to Neutral at Credit Suisse.

Zynga Inc (NASDAQ: ZNGA) started as Underperform with $3 target at Credit Suisse.

JON C. OGG