Analyst downgrades: BBY, UBS, CS and JEF

MOST NOTEWORTHY: Best Buy, UBS AG, Credit Suisse and Jefferies Group were today's noteworthy downgrades:

Deutsche Bank downgraded Best Buy (NYSE: BBY) shares to Hold from Buy on flat panel TV supply concerns as well as Wal-Mart's (NYSE: WMT) aggressiveness in consumer electronics.
Societe Generale cut UBS (NYSE: UBS) and Credit Suisse (NYSE: CS) to Sell from Hold as they expect weakness in the company's investment banking revenues.
Keefe Bruyette downgraded shares of Jefferies Group (NYSE: JEF) to Market Perform from Outperform on valuation as they do not see a near-term catalyst given the "choppy" environment and expense headwinds.

OTHER DOWNGRADES:

Greenhill & Co (NYSE: GHL) was cut to Market Perform from Outperform at Wachovia.
Citigroup lowered Entravision Comm (NYSE: EVC) to Hold from Buy.
Kosan Biosciences (NASDAQ: KOSN) was downgraded at Rodman & Renshaw to Market Perform from Outperform.

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