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After-hours buzz: Micron, T-Mobile, Nordstrom & more

Traders work on the floor of the New York Stock Exchange.
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Check out the companies making headlines after the bell Thursday:

Micron Technology shares jumped about 8 percent after the electronics maker handed in fiscal fourth-quarter earnings of 37 cents a share on $3.6 billion in sales, topping expectations of 32 cents a share on $3.55 billion.

Credit monitoring firm Experian said it experienced a data breach that impacted more than 15 million T-Mobile customers, according to Dow Jones. The incident, which exposed some users' personal information, pertains to applicants for postpaid service and device funding, the report said. Shares of the mobile provider were down nearly 2 percent after hours.

Retailer Nordstrom finalized the sale of its credit card portfolio to TD Bank. The financial servicer will now issue all Nordstrom-branded Visa and private label consumer credit cards. Nordstrom shares gained more than 4 percent after the announcement.

Advanced Micro Devices will cut about 5 percent of its global workforce as a part of "ongoing efforts to simplify its business." The chip manufacturer, which expects to take charges of about $42 million in connection with the plan, said it will save it approximately $58 million in its next fiscal year as a result. Shares about a half of a percent, before turning flat.

Food retail provider Supervalu said its CEO and President Sam Duncan will retire in February. The Minnesota-based company has named Chief Financial Officer Susan Grafton as his successor. Shares were up 1 percent in extended-hours trading.