New Zealand’s Supermarket Duopoly: How Foodstuffs and Woolworths Kept 82%

New Zealand’s grocery market is the clearest example in the developed world of how a small, distant economy drifts into duopoly and then finds it very hard to drift back out. This article explains how Foodstuffs and Woolworths NZ came to dominate, how each makes money, what the Commerce Commission found, what the Grocery Commissioner has and has not changed, and why a third national chain has not appeared despite an open invitation from the government. It is part of the New Zealand Company Stories hub.

How did New Zealand end up with a supermarket duopoly?

The duopoly is the product of a century of consolidation. Grocer-owned buying co-operatives formed in the 1920s to become Foodstuffs, while a string of mergers among corporate chains in the 1980s and 1990s left a single investor-owned rival, today called Woolworths NZ.

The co-operative side began when independent grocers pooled their buying to resist chain stores, creating the Four Square banner in the 1920s. The first self-service Four Square opened in 1948, New World followed as the full-service supermarket format, and Pak’nSave, a no-frills warehouse model, arrived in 1985. The regional co-operatives merged over time until only two remained: Foodstuffs North Island and Foodstuffs South Island.

The corporate side took a different path. Foodtown opened the country’s first modern supermarket in 1958, and over the following decades Foodtown, Countdown, Woolworths and other banners were bought, merged and rebranded under Progressive Enterprises. Australia’s Woolworths Group acquired Progressive in 2005, ran it for years under the Countdown name, and from 2023 began rebranding the stores as Woolworths.

Each merger was defensible on its own terms. Scale matters in a country of about five million people spread over two long islands, and each deal promised lower costs. The cumulative result, however, was a market with two national buyers, two national distribution networks and no third party able to match either.

How do Foodstuffs and Woolworths NZ make money?

Both earn a retail margin on roughly NZ$25bn of annual grocery sales, but through different structures. Foodstuffs is a pair of co-operatives whose members own individual stores; Woolworths NZ is a wholly owned subsidiary that runs corporate stores and reports to Sydney.

At Foodstuffs, the co-operative buys, warehouses and distributes, runs the Pams private label and the Gilmours and Trents wholesale arms, and holds much of the property. Each New World, Pak’nSave or Four Square is owned by a local operator, who keeps the store’s profit and receives rebates from the co-operative. Because the profit sits in several hundred private businesses, the group’s true profitability is harder to see than a listed company’s.

Woolworths NZ is more transparent. In the year to June 2026 it reported sales of NZ$8.49bn, up 2.5%, and earnings before interest and tax of NZ$163m, up 8.8%, a margin of only 1.9%. That is thin by the standards of its Australian parent and reflects several years of heavy spending on store conversions, wages and price investment.

A third income stream sits behind both: supplier funding. The Commission’s 2026 report found that the major retailers spent NZ$18.6bn with about 3,300 suppliers in 2025 and collected roughly NZ$6bn in rebates, discounts and promotional payments, equal to about 26% of their sales revenue. The top tenth of suppliers accounted for 90% of the spend.

Who owns the two groups and how are they governed?

Foodstuffs North Island and Foodstuffs South Island are separate co-operatives owned by their store operators, with boards elected largely from among those members. Woolworths NZ is owned by ASX-listed Woolworths Group, whose total sales reached A$71.5bn in the 2026 financial year.

The co-operative form has real strengths. Owner-operators live in their communities, carry personal capital at risk and tend to run tight stores. It also has a governance weakness: members benefit from limiting the number of competing stores, including other members’ stores, and the co-operative controls who gets a site. The model resembles New Zealand’s farmer co-operatives, described in the Fonterra story, more than it resembles a conventional retailer.

Woolworths NZ’s governance issue is the opposite one. Decisions on capital, range and technology are made in the context of a group whose New Zealand arm is a small share of earnings. The pattern of Australian parents owning dominant local operators is familiar from the Big Four banks, which were the subject of their own Commerce Commission study.

What did the Commerce Commission find in 2022?

The Commission’s market study, published on 8 March 2022, concluded that competition was “not working well”. It described rivalry between the two groups as muted, prices as high by international standards and profits as persistently above a normal return.

The numbers were stark. The Commission estimated that the major retailers earned a return on capital of about 12.9% between 2015 and 2019, against a fair return it put at about 5.5%. That gap was widely summarised as excess profits of roughly NZ$1m a day. The study identified three barriers to entry: a shortage of suitable sites, the incumbents’ land banks and restrictive covenants, and the lack of any independent wholesale supply.

It stopped short of recommending a break-up. Instead it proposed banning restrictive covenants, a mandatory code for supplier dealings, compulsory unit pricing, a wholesale access regime and a dedicated regulator. Parliament passed the covenants ban in June 2022 and the Grocery Industry Competition Act in 2023.

What does the Grocery Commissioner actually do?

The Grocery Commissioner, a role inside the Commerce Commission first held by Pierre van Heerden from July 2023, monitors the sector, enforces the Grocery Supply Code and the wholesale regime, and publishes an annual report on the state of competition.

The supply code governs how the big retailers treat suppliers, with penalties that can reach 3% of turnover. A revised code took effect on 1 May 2026, banning charges for unfit products and tightening protection against retaliation. The Commission has issued warnings to Foodstuffs North Island and Woolworths NZ under the code, and in July 2025 it filed civil proceedings against Foodstuffs North Island and Gilmours alleging cartel conduct.

Pricing accuracy has become a second front. The Commission brought Fair Trading Act charges against Woolworths NZ and two Pak’nSave stores, in Silverdale and Hamilton, over shelf prices and specials that did not match what was charged at the checkout. The two Pak’nSave stores pleaded guilty, with the prosecutor seeking a starting point of NZ$160,000 against a maximum of NZ$600,000 per offence.

What do the latest numbers say about competition?

They say very little has changed. The June 2026 report gives the three major banners 82% of the national market and a Herfindahl-Hirschman concentration score of 3,585, compared with 1,515 in the United Kingdom and 1,934 in Ireland.

Auckland is the least concentrated region, with the majors on 71%, and it is the only place where a foreign entrant is visible: Costco holds about 4% of the Auckland market from a single warehouse. Even there, the regional concentration score rose slightly between 2024 and 2025.

The report offers some comfort on margins. Gross margins on fresh food fell by about 0.8 percentage points in aggregate and on other groceries by about 0.2 points, with Pak’nSave in the North Island giving up most. Yet the Commission notes that both Foodstuffs co-operatives remain in the top tier of international peers on profitability. Food prices rose 4.6% in 2025, broadly in line with Britain and Australia.

Why has the wholesale regime not created new competitors?

Because access to the incumbents’ wholesale arms does not give a rival the incumbents’ cost base. Between July 2023 and August 2025 the regime generated only about NZ$22m of sales, a rounding error in a market worth roughly NZ$25bn a year.

The idea was to let small retailers buy branded goods from the major groups at competitive prices. In practice a customer buying through a competitor’s warehouse pays that competitor a margin, sees none of the supplier rebates, and has no control over range. Woolworths NZ supplied 78% of the wholesale volume, and 234 customers had been accepted by the end of 2025, most of them convenience stores and small grocers.

The entrants that have appeared are niche: Asian grocers, Farro Fresh in premium food, and a handful of independents in Christchurch and the Hutt Valley. None threatens a weekly main shop. That finding echoes the experience of general merchants, covered in the piece on The Warehouse Group, which trialled fresh produce from 2023 and was pitched by its founder in 2024 as a possible third grocery player.

Why did regulators block the Foodstuffs merger?

The Commerce Commission declined the merger of the two Foodstuffs co-operatives in October 2024 because it would have cut the number of major grocery buyers from three to two, strengthening the merged group’s hand over suppliers.

Foodstuffs North Island and South Island applied in December 2023, arguing that they do not compete with each other at retail, since each trades only on its own island, and that a single national co-operative would be cheaper to run. The Commission accepted the retail point but focused on the buying side: the merged entity would have been the largest acquirer of groceries in the country.

The co-operatives appealed in November 2024 and the High Court heard the case in March 2026. The episode shows how far the policy mood has shifted. A decade ago an efficiency merger of two non-overlapping co-operatives might have passed easily; in 2024 it was read as a move in the wrong direction.

Who competes with the big two, and why is there no third chain?

The fringe consists of Costco, The Warehouse, specialist grocers, meal-kit firms and convenience chains. No third national chain exists because entry requires sites, distribution centres and supplier terms at a scale that New Zealand’s population makes hard to justify.

In August 2025 Economic Growth Minister Nicola Willis announced an “express lane” for new supermarkets: fast-track consenting intended to cut approval times from about 18 months to under a year, a single national building-consent authority, changes to overseas investment rules and a sharper predatory-pricing test. The enabling amendment to the Fast-track Approvals Act passed on 11 December 2025.

The response from abroad was cool. Aldi and Lidl did not take part in the government’s request for information. Costco said faster consenting would help its plans for more warehouses, and five domestic players described expansion plans. A discount chain weighing New Zealand sees a market smaller than Sydney’s, 2,000 km from the nearest existing distribution centre.

The brands that sell through the duopoly feel the consequences directly. A manufacturer such as Whittaker’s can negotiate from strength because shoppers ask for it by name; hundreds of smaller suppliers cannot.

What are the main risks for the incumbents?

The largest risk is political rather than commercial: forced structural separation. Litigation, penalties and a slow loss of share in Auckland are secondary but real.

The government has commissioned cost-benefit work on restructuring options. Officials estimated in 2023 that a break-up could cost about NZ$3.8bn over 20 years in lost economies of scale, a figure the incumbents cite often. Against that, New Zealand First has proposed splitting Foodstuffs so that Pak’nSave competes against New World and Four Square, and in September 2026 the Green Party proposed a publicly backed chain, KiwiMart, built from 120 stores and two distribution centres bought from the incumbents at an estimated cost of NZ$2.8bn.

For Woolworths NZ the commercial risk is that a 1.9% margin leaves little room for error if a price war with Pak’nSave intensifies. For Foodstuffs it is that the co-operative structure, long an asset, becomes the target of reform, since separating banners is easier to imagine in a federation of owner-operators than in a corporate chain.

What can founders and CFOs learn from the supermarket duopoly?

The practical lesson is that in a small market, control of scarce infrastructure, here sites, distribution and supplier terms, matters more than brand or price, and that such control eventually attracts regulation that reshapes the economics.

• Map the bottleneck. The incumbents’ advantage is logistics and land, not shelf prices. Entrants who attack on price without solving supply fail.
• Treat rebates as a pricing system. A quarter of retailer revenue flowing back from suppliers means list prices are a starting point only.
• Expect regulation to follow returns. A return on capital more than double the benchmark was sustainable for years, until it was measured and published.
• Co-operatives hide and protect value. Member ownership kept Foodstuffs free of takeover and market scrutiny, and also made its profits a political mystery.
• Scale thresholds are real. Before blaming conduct, check whether a market of five million can support a third full-line network at all.

Founders building consumer brands should also read the profile of Sir Stephen Tindall, whose career shows both what a challenger retailer can achieve in New Zealand and where it runs out of room.

What happens next for the supermarket duopoly?

Three things will shape the next two years: whether any entrant uses the express lane, how the courts and the Commission resolve the outstanding cases, and whether the government formed after the late-2026 general election pursues structural separation.

Costco’s expansion beyond its first Auckland warehouse is the most concrete near-term change, and the Commission expects it to shift Auckland’s numbers. The 27 further site divestments the majors have signalled, and the steady removal of lease covenants, will free some land for rivals.

The deeper question is whether New Zealanders are prepared to pay the transition cost of a break-up in exchange for uncertain long-run gains. Every party now campaigns on grocery prices, and the regulator’s reports supply fresh ammunition each June. The duopoly has survived four years of scrutiny largely intact; it is less clear that it can survive four more.

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