Analyst Upgrades

• Aetna (AET) to buy from neutral at Goldman.
• Kellogg (K) to buy from neutral at UBS.
• PetSmart (PETM) to outperform from market perform at JMP Securities.
• NetApp (NTAP) and Scripps Networks (SNI) to buy from hold at Wunderlich.
• Thoratec (THOR) to buy from hold at Auriga.
• ArcelorMittal (MT) to overweight from neutral at HSBC.
• Bristol-Myers (BMY) to outperform from neutral at Cowen.
• Eaton Vance (EV) to neutral from sell at Ticonderoga.
• Adtran (ADTN) to buy from underperform at BofA/Merrill.

MOST NOTEWORTHY: GSI Technology, Array Biopharma and Continental Resources were today's noteworthy initiations:

• Merriman believes GSI Technology Inc (NASDAQ: GSIT) is positioned to benefit as growing bandwidth demand and increasingly complex protocols drive the need for faster and higher density memory in networking equipment. The firm started shares with a Buy rating.
• Array Biopharma Inc (NASDAQ: ARRY) was assumed with an Outperform rating at William Blair. The firm thinks the company's pipeline contains significant value, which will be catalyzed over the next 12-18 months by continued clinical progress and potential partnerships.
• Continental Resources Inc (NYSE: CLR) was initiated with a Buy rating and $30 target at Jefferies, and points to the company's double-digit growth and strong reserve growth potential.

OTHER INITIATIONS:

• Lehman initiated Ventas Inc (NYSE: VTR) with an Equal Weight rating $46 target and HCP Inc (NYSE: HCP) with an Overweight rating.
• The Boston Beer Company Inc (NYSE: SAM) was assumed with an Overweight rating and $43 target at HSBC.

MOST NOTEWORTHY: Ballard Power Systems Inc (BLDP), GSI Technology, Inc (GSIT), eTelecare Global Solutions (ETEL) and JA Solar Holdings Co, Ltd (JASO) were the most noteworthy initiations in today's modest-sized list:

• Lazard started Ballard Power (NASDAQ: BLDP) with a Hold rating based on valuation.

• GSI Technology (NASDAQ: GIST) is gaining shares at key customers while ramp-up of its next-generation product should act as a strong catalyst to revenue starting in 2H07; Baird started shares with an Outperform rating.

• Baird also initiated eTelecare Global (NASDAQ: ETEL) with an Outperform rating citing consistent above-industry growth rates.

• American Technology initiated JA Solar Holdings Co (NASDAQ: JASO) with a Buy rating, pointing to the company's long-term customer agreements and solid silicon position...

OTHER INITIATIONS:

• MetroPCS Communications, Inc (NYSE: PCS) was started with an Overweight rating at Lehman.

• Cowen initiated shares of NetGear, Inc (NASDAQ: NTGR) with a Neutral rating.

• Lazard initiated Itron, Inc (NASDAQ: ITRI) with a Buy rating.

• Pacific Crest started shares of AsiaInfo Holdings, Inc (NASDAQ: ASIA) with a Sector Perform rating.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).