"I suspect the underwriters will be selling their small additional over-allotment shares into the market for the next few weeks, which might keep the stock down for a while, but that's good for us, " says Adamo.

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Users who go over their monthly data allotment will pay an additional fee based on their existing data plan.

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Underwriters have an over-allotment option to sell up to an additional 3 million shares for selling holders.

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