Ownership Report🏦 Who Owns Australian Banking
The Big 4 control approximately 80% of Australian mortgages. Many products that appear to be alternatives — online banks, community brands, challenger apps — are owned by the same four institutions.
~80%
of AU mortgages held by
just 4 banks
$4.9B
ANZ paid for Suncorp Bank
approved on ACCC appeal, 2024
8%
market share held by
60+ customer-owned banks
The Big Four
🇦🇺 Commonwealth Bank (CBA)
ASX: CBA · Mortgage share: ~26% · est. 1911
Australia's largest bank by market capitalisation. Government-owned until privatised 1996. Significant offshore institutional investor base via ASX listing.
Brands & subsidiaries
🔴Bankwestacq. 2008WA bank with 120yr history. Fully absorbed into CBA — no longer a separate banking licence.
🔴Colonial First StateWealth management arm
🔴CommSecOnline broking — CBA's own brand
🔴UnloanCBA's 'digital challenger' brand. Same institution.
🇦🇺 Westpac Banking Corporation
ASX: WBC · Mortgage share: ~22% · est. 1817
Australia's oldest bank, founded 1817 as Bank of New South Wales. Renamed Westpac 1982. Acquired multiple regional banks with strong local identities.
Brands & subsidiaries
🔴St.George Bankacq. 2008NSW institution, strong regional identity. Fully owned Westpac subsidiary.
🔴BankSAacq. 2008SA brand via St.George acquisition
🔴Bank of Melbourneacq. 2011Westpac relaunched this WA brand in VIC for local appeal. Always a Westpac product.
🔴RAMS Home Loansacq. 2007Home loan brand — underwritten by Westpac
🇦🇺 National Australia Bank (NAB)
ASX: NAB · Mortgage share: ~17% · est. 1858
Created through the 1982 merger of National Bank of Australasia and Commercial Banking Company of Sydney. UBank was NAB's attempt at a challenger brand identity — a completely separate brand with different rates, same institution.
Brands & subsidiaries
🔴UBankNAB's digital/challenger brand. Merged with 86 400 (also NAB-acquired) in 2022.
🔴JudoBankNAB holds minority stake — SME-focused. Separately ASX-listed.
🇦🇺 ANZ Banking Group
ASX: ANZ · Mortgage share: ~14% · est. 1835
Formed from the 1970 merger of Bank of Australasia and Union Bank of Australia. Strong Asia-Pacific presence. Acquired Suncorp Bank (the banking division, not insurance) in 2024.
Brands & subsidiaries
🔴ANZ PlusANZ's digital banking app — same institution
🔴Suncorp Bankacq. 2024Queensland banking institution. ACCC approved acquisition on appeal. Strong QLD community identity — now ANZ.
What's a Customer-Owned Bank?
Customer-owned banks (also called credit unions, building societies, or mutual banks) are owned by their members — the customers. There are no external shareholders. Surplus profits are returned to members through lower fees, better rates, or community investment rather than extracted as dividends to shareholders.
Australia has over 60 customer-owned banking institutions. They hold approximately 8% of the market by assets — small, but growing. The Customer Owned Banking Association (COBA) maintains a directory at customerownedbanking.asn.au.
Verified IndependentCustomer-Owned Banks Worth Knowing
No shareholders. Profits stay with members.
Where the Profits Come From
The Big 4 earned a combined ~$31 billion net profit in FY2024. Here's how that breaks down — and which products are most extractive.
CBA FY2024
$10.2B
Highest of the Big 4
Westpac FY2024
$7.0B
Recovering from scandals
ANZ FY2024
$6.7B
Post Suncorp Bank acquisition
Where the money comes from
What it is
The dominant profit source. Net interest margin on mortgages is the core business. The Big 4 hold ~80% of AU mortgages — if you have a home loan, there's a 4 in 5 chance your repayments are flowing to one of them.
The sting
Australians now pay among the highest mortgage costs relative to income of any comparable country. The Big 4's mortgage dominance directly enables this.
What it is
Commercial and SME loans. Historically underserved — the Big 4 have preferred low-risk residential mortgages over business lending. This has been identified by the ACCC and Productivity Commission as a structural problem for Australian business.
The sting
Small businesses pay higher rates and face more friction accessing credit than equivalent businesses in comparable economies. The Big 4's preference for mortgages crowds out business investment.
Credit cards & personal loans
~12%
What it is
High-margin products. Average Australian credit card interest rate: ~19.5% p.a. The RBA cash rate has moved significantly — credit card rates have not followed. The spread between the cash rate and credit card rates is near historic highs.
The sting
Credit card interest rates in Australia have barely moved in 20 years despite significant cash rate changes. The IMF has specifically flagged AU bank credit card margins as above international norms.
Fees and transaction banking
~8%
What it is
Account fees, transaction fees, foreign exchange margins, merchant fees. Australia has reduced some fees (e.g., ATM fees largely eliminated) but merchant fee costs remain among the highest in the developed world relative to transaction value.
The sting
Every card transaction you make generates a merchant fee. The Big 4's payment network dominance means small businesses absorb these costs — which are then passed on in prices.
Wealth management & insurance
~5%
What it is
Despite divesting many wealth arms post-Royal Commission, the Big 4 retain significant income from financial planning, insurance, and investment products — often distributed through the same branches that handle deposits.
The sting
The Financial Services Royal Commission (2019) found systematic misconduct in this area — fees for no service, conflicted advice, selling unsuitable products. Structural reform has been partial.
Sources: CBA Annual Report FY2024; NAB Annual Report FY2024; Westpac Annual Report FY2024; ANZ Annual Report FY2024; APRA ADI Statistics; RBA Statistics; IMF Article IV Consultation Australia 2024.
Sources & References
- APRA Authorised Deposit-taking Institution statistics, 2024
- CBA acquisition of Bankwest: CBA and HBOS press releases, 2008
- Westpac acquisition of St.George: Westpac/St.George merger documents, 2008
- ANZ acquisition of Suncorp Bank: ACCC decision on appeal, 2024
- NAB/UBank/86400 merger: NAB press release, 2022
- Customer Owned Banking Association (COBA): customerownedbanking.asn.au
- APRA mortgage market share data: APRA Monthly ADI Statistics