Analyst downgrades 6-27-07: FFIV, LPSN, SUN, TSO and VLO

MOST NOTEWORTHY: The Mosaic Company (MOS), LivePerson (LPSN) and three U.S. refiners were today's noteworthy downgrades:

Stephens downgraded shares of LivePerson Inc (NASDAQ: LPSN) to EqualWeight from Overweight citing execution risk associated with the Kasamba.com acquisition.

Citigroup cut shares of Sunoco Inc (NYSE: SUN) to Hold from Buy and Tesoro Corp (NYSE: TSO) and Valero Energy Corp (NYSE: VLO) to Sell from Hold based on valuation...

OTHER DOWNGRADES:

Bear Stearns cut Ventana Medical Systems (NASDAQ: VMSI) to Peer Perform from Outperform.

Nuvelo Inc (NASDAQ: NUVO) was cut to Market Perform from Outperform at William Blair.

Keefe Bruyette downgraded shares of Cowen Group (NASDAQ: COWN) to Market Perform from Outperform.

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

Tags: analyst, cowen, cown, downgrade, f5, ffiv, liveperson, lpsn, mos, mosaic, nuvelo, nuvo, rating, sun, sunoco, tesoro, theflyonthewall.com, tso, valero, ventana, vlo, vmsi

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