Mercury NZ chief executive Fraser Whineray's decision to leave the electricity generator-retailer for Fonterra Cooperative Group was the major corporate news of the day. Whineray will end five years in charge of Mercury in 2020 to take up the reins as chief operating officer at Fonterra. Both stocks benefited from the news, with Mercury up 0.9 per cent at $5.45 and Fonterra Shareholders' Fund units rising 1.3 per cent to $4.05.
Fonterra fund units have jumped from $3.15 over the past month, with investors more upbeat about the cooperative's prospects with a new strategy.
McCarthy said the stock also offered investors a value proposition at a much cheaper price.
The rival power companies were generally stronger, with Meridian Energy up 0.2 per cent at $5.35 on a volume of 1.5 million shares. Trustpower rose 0.1 per cent to $8.28 and Contact Energy advanced 2.2 per cent to $8.98 on a volume of 1.4 million shares. Genesis Energy slipped 1.1 per cent to $3.50.
Summerset Group rose 1.7 per cent to $6.52 after reporting an 11.5 per cent increase in third-quarter unit sales, with strong growth in resales and stable new sales.
Ryman Healthcare decreased 0.1 per cent to $12.93, Metlifecare rose 1.1 per cent to $4.45, and Arvida Group fell 1.4 per cent to $1.46.
Stride Property Group led the market higher, up 3.9 per cent at $2.41 on an unusually small volume of 77,000 shares, compared to its 90-day average of 388,000.
Fletcher Building was the most traded stock on a volume of 2.8 million shares, more than twice its 1.3 million average. It rose 0.8 per cent to $4.85. Spark New Zealand was up 1.9 per cent at $4.65 on a volume of 2.1 million shares.
Of other stocks trading on volumes of more than a million shares, Auckland International Airport fell 1.2 per cent to $9.08, Air New Zealand increased 0.9 per cent to $2.855, Goodman Property Trust increased 1.4 per cent to $2.24, Precinct Properties New Zealand was unchanged at $1.85, Kiwi Property Group edged up 0.3 per cent to $1.67, and Z Energy rose 1.3 per cent to $5.64.
Port of Tauranga posted the day's biggest decline, down 1.7 per cent at $6.39 on a slightly lighter volume than usual of 104,000 shares.
Synlait Milk increased 1.6 per cent to $9.16 after long-serving chief financial officer Nigel Greenwood announced his exit early next year. A2 Milk Co declined 1.1 per cent to $13.04.
Australia & New Zealand Banking Group rose 0.4 per cent to $29.30 after it said annual earnings will be hit by a A$559m ($597.1m) cost to remediate over-charging and mis-selling products to its customers.
Outside the benchmark index, New Zealand Oil & Gas jumped 16 per cent to 72 cents after the energy explorer's suitor and major shareholder OG Oil & Gas lifted a takeover offer by 12 cents to 74 cents.
AFT Pharmaceuticals climbed 4.7 per cent to $3.10 after it said it signed a memorandum of understanding to work with medicinal cannabis company Setek on how to develop business models for medicinal cannabis products. Rival medicinal cannabis firm Cannasouth fell 1.5 per cent to 65 cents.
Evolve Education rose 11 per cent to 11.9 cents after the early childhood education centre operator said it bought four centres in Melbourne for A$11.8m. The acquisitions are expected to add A$2.5m to annual earnings.