Analyst upgrades:

• Bernstein upgraded Amgen (NASDAQ: AMGN) to Outperform from Market Perform on valuation as it believes threats to the core business are priced in at current levels and upside catalysts may come from pipeline news. The firm raised its target on shares to $65 from $57.
• Stephens upgraded CyberSource (NASDAQ: CYBS) to Overweight from Equal Weight on valuation as it believes the recent pullback creates a buying opportunity. The firm raised its target on shares to $16 from $14.
• JPMorgan upgraded Magna (NYSE: MGA) and Tenneco (NYSE: TEN) to Overweight from Neutral on expectations global auto production has sequentially bottomed with European light vehicle production rebounding in Q2. The firm also sees a short-term trading opportunity in TRW Automotive (NYSE: TRW), but keeps a Neutral rating on the stock.
• SINA Corp. (NASDAQ: SINA) was upgraded to Conviction Buy from Buy at Goldman.
• Cogent Communications (NASDAQ: CCOI) was raised to Buy from Hold at Citigroup.

Cogent Communications (NASDAQ: CCOI), a multinational, Tier 1 facilities-based IP networks, is expected to report Q4 EPS on Feb. 27.

CCOI March option implied volatility is at 89; April is at 77 and July at 72. CCOI average option implied volatility over the last 26-weeks is 62 according to Track Data, suggesting larger price movement.

Option Update is provided by Stock Specialist Paul Foster of theflyonthewall.com

MOST NOTABLE: Cabela's Inc (CAB), Time Warner Inc (TWX), Open Text Corp (OTEX) and Tortoise Capital Resources Corp (TTO) were some of today's more notable initiations:

• Cabela's inc (NYSE: CAB) was initiated with an Outperform rating and $30 target. The firm is confident in Cabela's outlook given the company's substantial store expansion opportunities, encouraging operating environment and valuation.

• Time Warner (NYSE: TWX) was started with a Buy rating and $25 target at UBS.

• Benchmark initiated Open Text Corp (NASDAQ: OTEX) with a Sell rating.

• Tortoise Capital Resources (NYSE: TTO )was initiated by both Ferris Baker and Stifel with a Buy rating.

OTHER INITIATIONS:

• CIBC initiated Volterra Semiconductor Corp (NASDAQ: VLTR) with a Sector Performer rating.

• Goldman initiated Savvis, Inc (NASDAQ: SVVS) with a Buy rating and $50 target.

• Cowen started Cogent Communications Group, Inc (NASDAQ: CCOI) with an Outperform rating.

• Avondale initiated Callaway Golf Co (NYSE: ELY) with a Market Outperform rating and $20 target.

• ThinkEquity started Adventrx Pharmaceuticals, Inc (NYSE: ANX) with a Buy rating and $5 target.

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