Fletcher Building fell 0.5 percent to $9.42, extending a four day sell off, on bigger-than-normal turnover of $87 million. New Zealand's largest listed company counts Australia as its biggest market, and is under pressure from a high kiwi dollar and a weakening Australian economy.
"A lot of New Zealand companies are struggling to gain any traction in that Australian market at the moment," Williamson said. "It's still a very sluggish economy over there, and not just that their currency is weak compared to ours, so any translation of earnings back into kiwi dollars is obviously going to be down."
Australian banks also fell. Westpac Banking Group fell 1.1 percent to $35.60 and Australia & New Zealand Banking Group declined 0.4 percent to $34.25.
Retirement village operator Metlifecare fell 0.2 percent to $4.14after reporting underlying profit growth in the first-half.
"Metlifecare is still in a transition period of adding care beds to their current rest homes and are still a year or so away until they really start to ramp up their pretty aggressive expansion," said Williamson. "The underlying financial performance for the past six months was pretty in line with what was expected."
Ryman Healthcare rose 2.6 percent to $7.90 and Summerset Group Holdings slipped 0.6 percent to $3.40.
Auckland International Airport rose 0.4 percent to $3.74. Cloud-based accounting software company Xero gained 0.02 percent to $40.15. Sky Network Television was up 0.8 percent to $6.12 and casino operator Sky City Entertainment Group climbed 1 percent to $3.93.
Outside the benchmark index, Cavalier Corp was unchanged at $1.70 after downgrading full-year guidance after a disappointing first-half. Mercer Group slipped 4.8 percent to 20 cents after the stainless steel fabricator said full-year profit will decline as it hires more staff.
Lyttelton Port Co sank 8.4 percent to $3.15 after the Christchurch ocean hub resumed paying dividend after its $438.3 million insurance settlement swelled its first-half profit.
Northland Port Corp, which owns half of Whangarei post operating company, was unchanged at $3.10 after reporting a 3.7 percent increase in first-half earnings which will flow onto annual gains.