MOST NOTEWORTHY:

• Piper upgraded shares of Mattel (NYSE: MAT) to Outperform from Peer Perform on valuation and improving fundamentals and notes that product recalls have historically not had a lasting impact on sales.

• Goldman upgraded UnitedHealth (NYSE: UNH) to Neutral from Sell on valuation and expectations for improved profitability in 2H07.

• Alcoa (NYSE: AA) was upgraded to Outperform from Market Perform at Friedman Billings on valuation and expectations for a favorable report next week.

• JMP Securities has increased confidence in 1-800-Flowers.com's (NASDAQ: FLWS) management initiatives to drive leverage and operating margins following the Q4 report, upgrading shares to Outperform from Market Perform.

• Lehman upgraded shares of Marathon Oil (NYSE: MRO) to Overweight from Equal-Weight on valuation and expectations for strong oil and gas production growth...

• NBTY Inc (NYSE: NTY) was upgraded to Neutral from Underperform at JP Morgan.

• ThinkEquity upgraded F5 Networks (NASDAQ: FFIV) to Buy from Accumulate.

• Goldman upgraded the oil services sector to Attractive from Neutral based on the recent pullback; Sunoco (NYSE: SUN) and Hess (NYSE: HES) were also upgraded to Buy from Neutral.

Analyst upgrades: AA, FFIV, MAT, UNH and SUN originally appeared on BloggingStocks on Thu, 09 Aug 2007 10:33:00 EST. Please see our terms for use of feeds.