Coles Group, one of Australia’s biggest supermarket chains, told investors that sales growth slowed sharply in the first quarter of fiscal 2027, and that ongoing cost of living pressures and intense competitor promotions are likely to leave first half supermarket earnings broadly unchanged from the prior year. The trading update triggered a heavy selloff in Coles stock and fresh questions about how quickly the company can regain momentum against Woolworths and discount rivals.

Key numbers and management guidance

In its quarterly sales update for the 13 weeks to September 27, Coles reported total group sales revenue of A$11.21 billion, up 2.2 percent year on year. Supermarket sales rose 3.6 percent to A$10.32 billion, but comparable store sales growth slipped to 2.7 percent from 4.6 percent a year earlier. Liquor revenue fell for a sixth consecutive quarter, down 1.3 percent to A$831 million.

Coles flagged that cost of living pressures faced by Australian households, together with heightened promotional activity by competitors, continued into early October. As a result, management said it expects first half Supermarkets earnings before interest and tax, excluding significant items, to be in line with the prior corresponding period.

Market reaction and investor concerns

Investors sold Coles shares heavily after the update. Trading commentary and market reports said the stock experienced one of its worst sessions in months as analysts and traders digested the slower sales momentum and the flat earnings outlook. Commentary from broker notes and market analysts highlighted the widening gap between Coles and Woolworths in recent monthly food sales growth figures, intensifying concerns about market share and margin pressure.

Analysts pointed to several structural challenges. Coles has been investing in eCommerce, loyalty, and store renewals, with eCommerce penetration rising strongly year on year, but the benefit of those investments has so far been insufficient to offset tougher trading in-store. The company opened several new supermarkets and completed a number of renewals during the quarter, and said exclusive own brand ranges performed well, but these gains were not enough to prevent a weaker comparable sales outcome.

Why this matters for Australia’s grocery sector

The update matters for Australia’s retail sector because Coles is a bellwether for household spending and competitive dynamics across the supermarket duopoly and the growing discount and online channels. A sustained slowdown at Coles could feed through to lower supplier orders, slower inventory turnover, and renewed price promotions, all of which would pressure margins across the sector.

For investors, the flat near term earnings outlook raises questions about valuation and dividend sustainability if sales momentum does not recover. For consumers, the intensification of promotions may offer short term relief, but could also mean further volatility in product availability as retailers battle for market share.

Company strategy and next steps

Coles emphasised areas of strength in the trading update, including growth in eCommerce, gains from exclusive ranges, and stronger customer engagement metrics for its loyalty program. Management said it will continue to focus on everyday value, product quality, and customer experience, while executing planned store refurbishments and rollout initiatives.

However, the company gave limited new forward guidance beyond its expectation that first half supermarket earnings will be flat. That conservative stance, paired with the sales miss, leaves the near term outlook dependent on whether Coles can both defend margins and capture sales as seasonal trading, including the critical Christmas period, unfolds.

Broader economic context

The trading update comes against a backdrop of elevated household cost pressures in Australia, a shifting mix of retail demand toward discount channels and online, and rising input costs for energy and supply chains in some segments. These forces have complicated the operating environment for big grocers that must balance price competitiveness with margin protection.

How Coles responds in the coming months will influence not only its own earnings trajectory but also competitive behaviour across the supermarket sector and the outlook for Australia’s consumer staples segment on the ASX.

Coles said it will provide further detail at its half year results and continue to update the market through routine investor communications. In the meantime, the company’s latest trading update has prompted investors to reassess near term expectations for earnings and market share performance.