QTMB's predecessors in the ADI demutualisation stakes have tended to emerge from the bottom rungs of industry rankings.Of the two credit unions queued up for a member vote soon, Queensland Professional (trading as Your Credit Union) marshals around A$430 million in net assets and $200 million in assets.Transcomm Credit Union, based in Melbourne, is a genuine minnow with $5 million in net assets and $75 million in assets, too small to even warrant an entry in KPMG's annual study of the mutual ADI sector.Goldfields Credit Union, now Goldfields Money, managed a transition to an ASX listing from equally tiny beginnings in 2012.MyState Financial from Tasmania (with around $1.8 billion in assets at the time), which also morphed into an ASX entity, is the only mutual ADI of ADI great size to shed that status until now.Of the 80 odd credit unions, mutual building societies and mutual banks that will be left (assuming all current proposals proceed) more candidates for demutualisation may yet be found among those not at risk of being directed to merge by APRA.A handful are improbably small, with total assets as low as $5 million in the case of Old Gold Credit Union Co-Operative in Melbourne's eastern suburbs.There are 23 more mutual ADIs with total assets of less than $100 million.Twenty one mutual ADIs have passed the $1 billion mark, a sector lead by QTMB's home town rival Credit Union Australia with around $12 billion in assets.