While the impending giant public offering of Facebook gets most of the attention, enterprise technology companies keep attracting the money. On Friday, Proofpoint, a maker of corporate security software, began trading at $16.85 a share, 30 percent above its initial public offering price of $13. The stock was expected to price in the $10 to $12 a share range. Another company, the network software maker Infoblox, opened at $22.57, about 40 percent above its $16 IPO price. Infoblox had an expected initial public stock offering price of $12 to $14.
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