Merrill Lynch upgraded Dell (NASDAQ: DELL) to "buy" from "neutral," according to Briefing.com. The news service also reports that Citigroup began coverage of Valero (NSYE: VLO) with a rating of "buy."
Costco (NASDAQ: COST) was cut to "neutral" at Piper Jaffray, according to 24/7 Wall St. The financial website also reports that NASDAQ (NASDAQ: NDAQ) was raised to "overweight" at Lehman Brothers.










