Artisan Partners, a U.S.-based investor in Seven & i Holdings, on Sunday opposed the Japanese retailer's CEO succession plan and urged the company to reconsider a takeover offer, according to a letter to the board. Last week, the 7-Eleven convenience store operator named Stephen Dacus as CEO to lead its recovery and respond to a $47 billion takeover offer from Canada's Alimentation Couche-Tard. In the letter, Artisan Partners opposed Dacus's selection and urged Seven & i to engage with Couche-