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co-founder Paul Allen has filed to sell his entire 19.95 million share stake in

USA Networks

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for $28.50 a share.

According to a filing with the

Securities and Exchange Commission

, Allen will sell the shares to various purchasers. Allen's planned sale price represents a discount to USA Networks' Thursday close of $29.35.

Shares of USA Networks were recently up 2.4% to $30.06.