New Zealand's benchmark index hit a new 52-week high Friday, buoyed by an upgraded earnings guidance from a2 Milk Company (NZE:ATM, ASX:A2M).

The S&P/NZX 50 Index rose 2.2%, or 276.66 points, to close at 13,041.90. The index has gained 2% over the last five trading days.

Consumer non-durables led the increase as stocks climbed more than 5%. Health technology and non-energy minerals shares followed, with gains of over 3% each.

a2 Milk soared almost 16% after it upgraded its fiscal 2025 year-on-year revenue growth guidance to "mid to high single-digit revenue growth" from "mid single-digit growth."

The company attributed the revised outlook to a significant increase in Mataura Valley Milk external ingredient sales.

In other corporate news, Oceania Healthcare (NZE:OCA, ASX:OCA) fell 5% after it reported a loss of NZ$0.024 per share for the six months ended Sept. 30, compared with earnings of NZ$0.049 per share a year earlier.