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After-hours buzz: Alibaba, Under Armour, Staples & more

Michael Nagle | Bloomberg | Getty Images

Check out the companies making headlines after the bell Tuesday:

Alibaba shares stumbled after Japan's SoftBank said it will sell at least $7.9 billion in shares. SoftBank previously owned about 32 percent of the e-commerce giant's shares, and the transaction will bring its stake down to about 28 percent. Yahoo, which owns a stake in Alibaba, also edged lower after the report.

Shares of Under Armour dipped briefly in extended trading after the athletic apparel brand adjusted its shareholder guidance to reflect the shuttering of retailer Sports Authority. Under Armour expects to recognize an impairment charge of about $23 million during the second quarter of 2016 related to Sports Authority's liquidation. As a result, Under Armour recast its revenue and profit expectations.