Staples Inc., the office-supply giant headquartered in Framingham, said Monday that Michael A. Miles Jr., president and chief operating officer, will resign from the company, effective Feb. 2.

Miles has accepted a position with Berkshire Partners, the Boston-based investment firm, Staples said in a press release.

In September, Staples announced plans to turn around its retail business by closing US and international stores, reducing the size of existing shops, restructuring its international business, and shaking up leadership, a Globe story noted. The company said then that it was consolidating its retail and online operations, closing 45 stores and delivery businesses in Europe, pursuing the sale of its European printing systems business, and appointing a new president of Staples Europe.

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Staples has annual sales of roughly $25 billion.