"What has created buying in our market for quite some time now is our economic
outlook," Williamson said, who expected Thursday's budget to confirm further growth in the economy.
Energy stocks were mixed. Contact Energy rose 0.4 percent to $5.50. Meridian Energy advanced 0.4 percent to $1.20.Vectoer, the Auckland lines company, was the day's worst performer down 2 percent to $2.49 while MightyRiverPower slid 1.8 percent to $2.225.
Recent political polls have called into doubt the presumption the National-led government will return for a third term after September's election. The main opposition parties, Labour and Greens, want to re-regulate the energy sector, creating a state-owned central buyer to push down consumer electricity bills.
"Investors in the electricity generators will really be waiting for the next lot of election poll results to determine how things are tracking. That sector is likely to remain volatile as we head into the election," Williamson said.
Fletcher Building, New Zealand's largest listed company, was unchanged at $9.32. Xero, the cloud-based accounting firm, climbed 1.4 percent to $30.62.
Infratil, the infrastructure investor, advanced 1.1 percent to $2.29 ahead of reporting its earnings tomorrow. Trustpower, which is majority owned by Infratil, was unchanged at $7.05. The electricity generator and retailer reported a drop in full year profit last week, as it chased growth in its Australian windfarms to offset a drop in New Zealand sales.
Ryman Healthcare fell 0.5 percent to $8.64. The retirement village operator is due to report earnings this week, which Williamson said are expected to be strong but are already priced in.
Auckland International Airport advanced 1 percent to $4.12 after New Zealand's busiest gateway announced it plans to raise $150 million through a seven-year bond issue.
Units in Fonterra Shareholders' Fund were unchanged at $6.00 after Fonterra Cooperative Group said the gap between cheese and milk powder prices had lessened, reducing pressure on its margins. The units give investors access to the dividend stream.
Skellerup Holdings, the industrial rubber maker, rose 0.6 percent to $1.71. A substantial shareholder's notice showed Milford Asset Management had upped its holding in the stock to 9.6 percent.