(Bloomberg) -- T-Mobile US Inc. plans to offer shares as part of a transaction with co-owner SoftBank Group Corp., which is unloading a portion of its stake in the wireless carrier.

T-Mobile will hold a public offering of 133.5 million shares of its common stock, the mobile-phone company said in a statement. It also will grant the underwriters an additional 10 million shares of its common stock.

Additionally, T-Mobile intends to sell up to 30 million shares of its common stock to a Delaware statutory trust.

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