Stocks Tightly Mixed After Open; Alibaba Climbs On Q2 Results

... The stock was almost 4% above a 99.80 buy point in a short IPO base. (NASDAQ: REGN ) sagged 4% lower. The Tarrytown, N.Y., biotech turned in earnings and revenue shy of analyst projections. The gap-down loss left shares 7% below last week's high. ...

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