Worthington Industries currently has market capitalization of $2.58 billion, 63 million shares outstanding, and debt outstanding of $580 million. Suppose the market expects Worthington to maintain this level of debt forever. Worthington's marginal tax rate is 27%.

This afternoon, Worthington will surprise the market by announcing it will issue an additional $300 million of debt and use the proceeds to repurchase shares. Worthington will maintain its new level of debt going forward. What is the expected return on Worthington's stock around the announcement?