The Tiny Dairy Stock That Skyrocketed to New Zealand's Biggest

The production line at the A2 Milk plant in Sydney, Australia.Photographer: Brendon Thorne/Bloomberg
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A2 Milk Co. is giving New Zealand equity stalwarts a run for their money.

In a span of about four years, its market cap has surged more than 3,000 percent, making it New Zealand’s most valuable company. It now has a value of about NZ$10.9 billion ($7.5 billion) -- that’s larger than some of the mainstays of the nation’s bourse such as Auckland International Airport Ltd. and Fonterra Co-operative Group Ltd.