Australia and New Zealand Banking Group Limited (ASX:ANZ) has narrowed the list of bidders for its wealth unit. The bank has invited AIA Group Limited (SEHK:1299), MetLife, Inc. (NYSE:MET) and Zurich Insurance Group AG (SWX:ZURN) to make second-round offers for the business by September 15, 2017, according to certain people with knowledge of the matter. Shortlisted bidders will now conduct detailed due diligence and hold meetings with the unit's management, the people said, asking not to be identified because the details are private.