MOST NOTEWORTHY:

• Freidman Billings cut Medimmune inc (NASDAQ: MEDI) to Market Perform from Outperform on valuation. Prudential downgraded shares to Neutral from Overweight and recommended investors take profits in the company.
• J.B. Hunt Transport Services Inc (NASDAQ: JBHT) was downgraded to Peer Perform from Outperform at Bear Stearns citing valuation.
• Lockheed Martin (NYSE: LMT) was removed from Goldman Sachs Conviction Buy List and prefers L-3 Communication (LLL) over the large-cap aerospace/defense company.
• Komag Inc (NASDAQ: KOMG) was downgraded to Sell from Neutral at American Technology as they believe industry fundamentals have weakened and that the Seagate (STX) preannouncement will increase pricing pressure.

• Stifel downgraded Mercantile Bank (NASDAQ: MBWM) to Hold from Buy at Stifel.
• Soliel downgraded shares of Limited Brands (NYSE: LTD) to Hold from Buy.
• Matrix USA cut DSP Group (NASDAQ: DSPG) to Strong Sell from Hold.
• Brean Murray downgraded shares of Keithley Instruments (NYSE: KEI) to Sell from Buy with a $13 target following the company's Q2 pre-announcement.
• Needham cut Semitool Inc (NASDAQ: SMTL) to Hold from Buy.

Analyst downgrades 4-13-07: JBHT, LMT, LTD and MEDI downgraded today originally appeared on BloggingStocks on Fri, 13 Apr 2007 11:21:00 EST. Please see our terms for use of feeds.