• 24/06/1971 - Registered - BHP Group Employees Credit Co-operative Limited - VIC
  • 01/01/1995 - Accepted engagements of Lysaght Employees (Victoria) Credit Union Co-operative Limited
  • 24/02/2003 - Name changed to Big Sky Credit Union Limited
  • 01/09/2003 - Accepted engagements of BP Employees Credit Co-operative Limited (VIC)
  • 01/05/2006 - Merged with RACV Credit Union Limited
  • 01/11/2009 - Merged with GMH (Employees) QWL Credit Co-operative Limited; continuing to trade as Big Sky Credit Union Limited
  • 1/04/2012 - Merged into LifePlan Building Society and renamed Big Sky Building Society
  • 24/10/2018 - Name changed to Australian Unity Bank
  • AGY1002