BHP Shares Widen Lead as Australia Most Valuable, While CBA Suffers Historic Rout

BHP Group has cemented its position as Australia’s most valuable company, with its market capitalisation now towering at A$303.72 billion compared to Commonwealth Bank’s A$257.16 billion following a dramatic shift in fortunes that has reshaped the ASX landscape this year.

BHP shares hit a fresh all-time high of A$62.30 on Wednesday, gaining 2.91 percent on the day and extending year-to-date gains to 34.44 percent. The rally has pushed the miner’s relative strength index to 75.02, well into overbought territory, yet momentum shows no signs of abating.

In stark contrast, CBA plunged 10.43 percent in its worst single-day percentage decline on record, dragging the bank into negative territory for 2026 at down 4.62 percent year-to-date. The A$46.56 billion gap between the two companies marks a significant widening from earlier in the year when they traded neck-and-neck for the top spot.

Shifting Tides

The divergence reflects a fundamental shift in market sentiment away from domestically exposed financials toward globally diversified commodity producers.

BHP’s latest half-year results to 31 December 2025 revealed copper has overtaken iron ore as the company’s largest profit contributor for the first time, driven by record copper prices and strong operational performance. The company achieved near-record production volumes in both iron ore and copper over 2025, with iron ore output maintained in the mid-250 million tonne range and copper operations delivering robust margins.

The miner has also benefited from an easing of tensions with China after state-backed buyer China Mineral Resources Group partially lifted restrictions on BHP cargo purchases in April 2026. The earlier freeze had created a significant political risk overhang, but Bloomberg reports indicating resumed purchases at selected steel mills helped compress that risk premium. BHP’s CFO has stated publicly that new investors are buying in specifically for copper exposure and artificial intelligence-linked demand, rather than traditional iron ore leverage.

Meanwhile, CBA’s collapse came after a flat trading update, higher bad loan provisions, and growing concerns around mortgage growth. Proposed federal budget changes to negative gearing and capital gains tax have sparked analyst warnings that Australia’s 30-year housing super-cycle may be ending, fundamentally undermining the investment thesis for banks that had been priced as bond proxies.

What Lay Ahead

Markets are clearly rotating toward global commodity exposure at the expense of domestic housing cycle plays. The narrative that copper is “the new oil” for artificial intelligence infrastructure and decarbonisation has taken hold, supporting premium valuations for diversified miners with significant copper exposure. BHP’s evolution from an iron ore income stock to a copper-centric growth story aligns perfectly with this thematic, attracting both institutional flows and retail interest.

BHP has now carved out a commanding lead over CBA after differing starts to 2026,  and while overbought technicals and rich valuations suggest vulnerability to any negative surprise, the combination of strong operational delivery, easing China tensions, and powerful thematic tailwinds continues to attract capital, leaving the stock well-positioned to maintain leadership.

Bull Case: