CBA and Macquarie Lead June Mortgage Book Growth

APRA data shows Australia's top 10 lenders hold a combined $2.30 trillion in housing loans, with Macquarie posting the strongest monthly growth rate.

Understanding which lenders are actively growing their mortgage books — and which are contracting — gives borrowers useful context when shopping for a home loan or preparing to refinance. The Adviser reports that analysis of the June 2026 APRA monthly ADI statistics by Agile Market Intelligence found the country's 10 largest authorised deposit-taking institutions now hold a combined $2.30 trillion in residential lending, with the growth concentrated firmly at the top.

Two lenders stood out from the field in June: Commonwealth Bank of Australia on dollars added, and Macquarie Bank on growth rate.

CBA Leads on Volume, Macquarie on Pace

Commonwealth Bank of Australia retained its position as the nation's largest home lender by a considerable margin, adding $5 billion to its housing loan book in June — the largest single-month dollar increase among the lenders reviewed. CBA's total housing portfolio includes $413 billion in owner-occupied loans and $222 billion in investment lending. The overall book is weighted 65% toward owner-occupied borrowers, meaning nearly two-thirds of CBA's residential exposure sits with homeowners rather than investors.

Macquarie Bank delivered the standout growth rate of June, expanding its housing loan book by $3.39 billion or 1.88% during the month. At $184 billion, Macquarie holds the largest housing portfolio among the mid-tier lenders, with owner-occupied loans accounting for around 60% of its book. The 1.88% monthly growth rate is well ahead of the 0.50–0.80% range that the major bank cohort generally posted during June, indicating that Macquarie's competitive positioning in mortgages remains active.

Among the remaining major banks, ANZ produced the highest monthly percentage expansion of the group, with its housing loan book rising 0.95% in June — an acceleration after a more subdued prior month. The remaining major banks grew within a relatively narrow range of 0.50–0.80% per month, with growth appearing to have settled after what Agile characterised as stronger gains earlier in the year.

Across the top 10 institutions, owner-occupied lending remained the principal source of housing-loan balances. CBA maintained both the largest investment portfolio and the largest owner-occupied book, reinforcing its presence across both borrower segments.

Mid-Tier Divergence: Who Is Growing and Who Is Contracting

The mid-tier lenders presented a more varied picture in June, with ING extending its growth trajectory while several others remained in contraction.

ING Bank recorded a 0.76% rise in its housing loan book during June and holds the highest owner-occupied concentration among the institutions reviewed — 74% of its portfolio is tied to owner-occupier lending. That profile gives ING a particular focus on the segment that tends to generate stronger relationship stickiness.

Bank of Queensland and Suncorp Bank both remained in negative territory, with housing loan books declining 0.42% and 0.23% respectively. Agile noted that both results nevertheless represented an improvement on earlier months, suggesting the rate of contraction is easing rather than deepening. Bendigo and Adelaide Bank and HSBC also recorded smaller declines of 0.16% and 0.44% respectively.

The divergence between lenders in growth mode and those in contraction is a useful signal for borrowers. Lenders actively growing their books typically need to attract new borrowers, which often means more competitive rates, stronger cashback offers, or more flexible credit policies to generate that volume.

What Lender Momentum Means for Your Rate

For owner-occupiers with a loan held at a contracting lender, the picture is worth examining carefully. A lender managing a declining book may be less motivated to retain existing customers through rate adjustments, whereas a lender chasing growth has more incentive to offer competitive terms. Running a refinance savings estimate gives you a clear read on whether switching could save you meaningful money before you commit the time to a full application.

For prospective buyers, the fact that the market's top 10 lenders now hold $2.30 trillion in combined residential lending — and that several are actively competing for new-to-bank borrowers — means meaningful competition for good quality loans remains in place. Comparing home loans across lenders is the most direct way to access that competitive tension and find where the market is currently sharpest.

Investors should note that CBA maintained both the largest investment portfolio and the largest owner-occupied book among the lenders reviewed. If your investment lending sits with a lender currently in contraction, it is worth benchmarking your rate against current investor home loan options to confirm you are not paying a loyalty premium in a market where more aggressive alternatives exist.

The gap between Macquarie's 1.88% growth rate and the contractions recorded by several mid-tier lenders reflects how actively differentiated lender behaviour is right now. That differentiation is what makes comparison genuinely valuable — and what makes reviewing your loan more important than in periods when all lenders move in the same direction.

The full analysis draws on Agile Market Intelligence's review of APRA monthly ADI statistics for June 2026, as reported by The Adviser.

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