• SanDisk Corp. (NASDAQ:SNDK) was upgraded at Goldman Sachs to Buy from Neutral because they expect an improved NAND pricing environment.
• Baird upgraded Lear Corp. (NYSE:LEA) to Neutral from Underperform, with a $36 target, following the buyout offer from Carl Icahn's American Real Estate Partners LP for $36 a share.
• Deutsche Bank upgraded shares of Sunoco, Inc (NYSE:SUN) to Buy from Hold due to better-than-expected demand as well as rising East Coast margins.

• Merriman upgraded 8x8, Inc (NASDAQ:EGHT) to Buy from Neutral. The firm believes that by focusing on the SOHO VoIP market, 8x8, Inc has formed a solid revenue base from which to grow; the broker also finds shares undervalued.
• Wachovia upgraded shares of Parkway Properties, Inc. (NYSE:PKY) to Outperform from Market Perform based on relative valuations, as opposed to Highwoods Properties (HIW), which was downgraded today.
• Stifel took RealNetworks, Inc. (NASDAQ:RNWK) up to Hold from Sell on valuation.
  
• Goldman reinstated Catalina Marketing Corp. (NYSE:POS) with a Neutral, up from its previous Sell rating.
• American Technology added Silicon Image, Inc. (NASDAQ:SIMG) to its Focus List, as the firm believes its recent weakness provides investors with a buying opportunity.
• Matrix US upgraded MapInfo Corp. (NASDAQ:MAPS) to Hold from Sell based on valuation.

Analyst upgrades 2-20-07: SanDisk, Lear and Sunoco ... originally appeared on BloggingStocks on Tue, 20 Feb 2007 12:15:00 EST. Please see our terms for use of feeds.