Approval should come soon. The $6.17 net arbitrage spread offers a 12% IRR if the deal closes midyear. Questar The definitive proxy for the Dominion Resources ( D ) acquisition of Questar (STR) was filed with the SEC. Questar shareholders vote on May 12. Office Depot Final arguments for the merger hearing between the FTC and Staples (SPLS) regarding the Office Depot ( ODP ) acquisition are on April 19. There is a $2.03 net arbitrage spread. More to come in future editions of M&A Daily… Done deal Youku (YOKU) was successfully acquired. Dead deal Pfizer ( PFE ) and Allergan (AGN) walked away from their deal. The decision was driven by the actions announced by the Treasury Department which qualified as an "Adverse Tax Law Change" under the merger agreement. Elsewhere on Seeking Alpha