Financial stocks advanced 1.4 percent, led by the "Big Four" banks, which rose between 1 percent and 2.3 percent.
Australia and New Zealand Banking rose more than 2 percent after the bank pledged on Tuesday to lend more to investors as it reported the lowest annualised growth rate in mortgage lending in more than two years.
Investors have "refocused attention on the big four because that's where the gains are," said Michael McCarthy, chief market strategist at CMC Markets.
New Zealand's benchmark S&P/NZX 50 index was marginally lower, falling 0.23 percent or 21.18 points to finish the session at 9,224.26.
Dairy product maker a2 Milk Company skid 2.2 percent, while Auckland International Airport dipped 0.6 percent.