Zamp shares jumped about 19% in one session after Abu Dhabi fund revealed its plan to buy 45.15 percent.
Mubadala, Abu Dhabi's sovereign wealth fund, is bidding to buy Zamp SA, which owns Burger King and Popeye in Brazil.
Mubadala already owns 5% of Zamp and initiated a tender offer. According to a securities filing, it offered 7.55 reais per share for 45.15 percent of total ownership, bringing its position to 50.1%.