Dow Jones and S&P 500 Close at Record Highs for Fourth Day as US-Iran Deal Hopes Sink Oil and Bond Yields

The Quick Take

• Dow Jones and S&P 500 posted record closes for the fourth consecutive session amid US-Iran deal optimism
• Oil prices fell sharply as diplomatic progress raised expectations of increased Iranian crude supply reaching global markets
• Bond yields declined alongside oil, providing a dual tailwind of lower inflation expectations and easing financial conditions
• Falling US yields narrow the differential that drives FII outflows from Indian and Asian equity markets

US equity indices extended their record-setting streak to four consecutive sessions on August 4, 2026, with both the Dow Jones Industrial Average and the S&P 500 reaching new all-time closing highs. The catalyst was a convergence of macro tailwinds: progress in diplomatic negotiations between the US and Iran raised the prospect of additional Iranian crude oil re-entering global markets, driving oil prices sharply lower and simultaneously pulling bond yields down as inflation expectations softened. This dual easing reinforced risk-on investor sentiment that has characterized the current US earnings season, encouraging capital rotation into equities from fixed income.

Lower US bond yields improve the relative attractiveness of equities by reducing discount rates applied to long-duration earnings streams, extending the valuation runway for growth stocks. For Indian and Asian markets, the yield dynamic is particularly significant: narrowing the gap between US 10-year yields and Indian government bond yields reduces the incentive for foreign institutional investors to rotate capital out of Indian markets toward US fixed income. FII flows into Indian equities historically improve when US yields retreat. Peer indices in Singapore, Hong Kong, and Japan were positioned to follow the US lead in after-hours trading and on the following session open.

The critical forward variable is whether US-Iran negotiations conclude with a formal supply agreement. If talks stall or collapse, oil prices could reverse sharply — rekindling inflation expectations and driving bond yields back up, unwinding the equity tailwind. Watch for formal State Department or Iranian foreign ministry confirmation of deal progress. The next OPEC+ ministerial meeting is a secondary signal: any Iranian supply increase negotiated under a deal would need to be accommodated within OPEC+ quota frameworks or would trigger a production renegotiation that could partially offset the bearish oil price impact.

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