In the home loan market, Macbank wins again in May, Commbank holds its position, ANZ wins back some lost positions, but NAB and Westpac shed some share

APRA's May release of its monthly banking data shows a shift in who is winning and who is losing the battle for market share of the home loan market.

The data in this table shows that the growth of bank mortgage books slowed in May, rising less than +$6.9 bln from April. That is far less than the April 2026 rise of +$7.9 bln, in fact -10.1% less. And that was before the Canberra Budget on May 12 and the market-cooling measures announced then.

But the smallest of the big banks, Macquarie, still grew its home loan book more than any other bank including Commbank. And it did so for both owner-occupier mortgages and household investor lending.

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Macbank wasn't the only one to raise its market share in May from April. ANZ might be getting its mojo back because in both categories they made a notable recover.

Paying the price however were NAB and Westpac, both of whom gave up market share in May from April.

Heavyweight Commbank is hanging in there at levels similar to their overall market share of 25.3% for owner-occupier lending, but light for investor lending. Commbank is the only big bank making a concerted effort to win business without brokers.

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