Oil plunges 12% as US-Iran pause cools supply fears; ASX 200 surges 1.4%

The sudden retreat in oil prices after a fleeting US-Iran ceasefire is splitting the financial world: equity traders cheered the relief, but bond vigilantes drove yields to 2026 highs, warning that the inflation genie isn't back in the bottle. For investors, the 12% plunge in Brent and a 1.4% rally on the ASX 200 disguise a deeper conundrum — the diverging signals from stocks and fixed income can't coexist indefinitely, and history suggests the bond market’s inflation anxiety may soon crash the party.

Global oil markets experienced a dramatic reversal on Monday as Brent crude slid more than 12% from its late-week peak, settling near $86.40 per barrel following reports that the United States and Iran had agreed to pause hostilities after 13 days of sustained airstrikes. The ceasefire, however tentative, immediately cooled the geopolitical risk premium that had driven crude to over $102 per barrel only the previous Thursday. This sharp pullback cascaded across Asian equities, with Australia's S&P/ASX 200 jumping 121.7 points, or 1.39%, to 8894 — its best single-session performance since mid-June. The broader All Ordinaries mirrored the advance, gaining 1.37% to 9063.8, as resource-heavy sectors rode the wave of lower input cost expectations and renewed risk appetite. Across the region, indices traced a similarly positive arc, underscoring how pivotal the Middle East supply narrative had become for global asset allocators.

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The ceasefire, however tentative, immediately cooled the geopolitical risk premium that had driven crude to over $102 per barrel only the previous Thursday.

Beneath the surface, however, a palpable tension was unfolding between equity and bond markets. While share traders celebrated the de-escalation, fixed-income participants were sending an altogether different signal. US Treasury yields had continued their relentless ascent through the prior week, with the benchmark 10-year note surging to its highest level of 2026 as inflation concerns, exacerbated by the conflict, refused to fade. The sell-off in bonds reflected a market pricing in a more hawkish Federal Reserve trajectory, a dynamic that historically weighs on growth and risk assets. Moomoo market strategist Michael McCarthy captured the divergence: 'Interest rate traders are saying one thing and share traders are saying another, and unfortunately, I think the bond traders are going to be right.' His warning highlights the fragility of the equity rally — it rests on a ceasefire that may not hold, while the underlying inflation impulse from elevated energy costs and disrupted supply chains lingers.