(Bloomberg) -- Brookfield Asset Management Inc.’s planned A$18.7 billion ($11.9 billion) acquisition of utility Origin Energy Ltd. is under threat after the target’s top investor said it would vote against the deal. Most Read from BloombergIsrael Latest: Netanyahu Vows to Stay On; Targets Hit in LebanonInnovent, Lilly Obesity Drug Spurs More Weight Loss in TrialSony’s Bungie Game Unit Cuts Staff Following Delayed TitlesSaudi Forces on High Alert After Deadly Clash With Houthi RebelsHouse Republi