Pan American Silver (NASDAQ:PAAS) shares were down more than 3% Tuesday after the stock was downgraded to Sell from Neutral at Goldman Sachs, which lowered its price target to $10 from $15.22. PAAS was trading in a 52-week range of $14.66 to $15.04.

Novo Nordisk (NYSE:NVO) shares were up about 5% after Bank of America raised its rating on the healthcare company’s stock to Buy from Neutral Tuesday. NOV hit an all-time high of $48.42 per share on the upgrade.

Rosetta Resources (NASDAQ:ROSE) has erased gains made over the past three days and is trading more than 8% lower on the heels of a downgrade by Howard Weil and lackluster Q4 results. Although the oil exploration and production company late Monday reported EPS of $0.83 vs estimates of $0.78, $204.8 million in revenue missed estimates of $221 million. As a result, Howard Weil lowered its rating on the stock to Outperform from Focus Stock and cut its price target to $65 from $72. ROSE last traded at $43.42 with a 52-week range of $39.33 to $65.30.

Infoblox (NYSE:BLOX) gained 2.6% to $23.21 per share in afternoon Tuesday trading following new Deutsche Bank started coverage with a buy rating and price target of $25 per share. StreetInsider.com reports analyst Vijay Bhagavath said “We take a long view on Infoblox’s growth story over the next few years. We note reset expectations and favorable risk/reward at current levels.” BLOX, an information technology company, has a 52-week price range of $17.10 – $48.97 per share.