Sprint Nextel (S) and its subsidiaries have offered approximately $2.1 billion in cash to purchase the shares of Clearwire (NASDAQ: CLWR) they do not already own.

Sprint already owns a majority interest in Clearwire, equal to approximately 51.7% of its outstanding stock. As per a Dec. 11 Schedule 13D filing with the SEC, Sprint would pay for the outstanding shares from "working capital."

Sprint has agreed to pay shareholders $2.90 per share, valuing Clearwire at approximately $4.2 billion. Of the remaining shares outstanding, Comcast (CMCSA -0.37%) and Intel (INTC 0.64%) each hold positions in Clearwire. Comcast's approximately 88.5 million shares represent 12.8% of Clearwire's common stock, while Intel's ownership stake is 12.4%.

A Sprint spokesperson declined to comment on the proposed transaction, stating "We are not commenting beyond it [the SEC filing]."

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