US, Iran to begin talks about reopening Strait of Hormuz, denuclearization
Measured from 2 Aug 2026 (event start), not the 2 Aug 2026 announcement
Oil tanker operators moved -8.6%, the largest reaction measured, though not statistically significant, meaning it may reflect normal market noise rather than the event itself. This is a provisional result; the full measurement window is not yet complete.
STNG, FRO, INSW · down
What Happened
President Trump reversed course on planned military strikes against Iran and announced that the US would enter direct negotiations with Iran to reopen the Strait of Hormuz and address denuclearization. Qatar mediated the turnaround, presenting a revised proposal to Iranian officials after Saudi Crown Prince Mohammed bin Salman urged Trump to de-escalate. The Strait, which handles roughly 21 percent of global oil transit, has been effectively constrained by six months of US-Iran military conflict. This represents a potential breakthrough in a conflict that has driven significant energy price volatility and supply uncertainty since early 2026.
Potential resolution of six-month energy crisis affecting 21% of global crude trade, with immediate downward pressure on oil prices and margin expansion for energy-dependent sectors
Talks began August 3, 2026; duration and breakthrough probability unknown but any stabilization of the Strait would take weeks to operationalize
Trump announced talks would begin on Monday afternoon (August 3), with reporting dated August 2 confirming the decision after he called off planned strikes over the weekend
Read how dates work →Partial reaction shown. Significance flags are marked provisional and may change as more price data accumulates.
How To Read This
Each sector below is a basket of named stocks. The percentage shown is the move beyond the overall market (S&P 500) , what event studies call the . A move only counts as when it sits clearly outside that basket's normal weekly swings.
How Much Sectors Moved
Path over time. Click a sector in the legend to toggle it. Dashed lines mark key moments.
Oil tanker operators moved most at -8.6% against the market, the direction you would expect from a waterway block. None of the moves cleared the significance threshold. Read the direction as flavour, not signal.
Volatility
Volatility measures how erratic prices became, a separate signal from the direction of the move.
Market fear eased
- Oil tanker operators35% → 35%volatility roughly unchanged
- Oil & gas producers26% → 39%1.5x more volatile after
- Defense contractors29% → 6%4.7x calmer after
- Gold21% → 25%1.2x more volatile after
- Airline stocks40% → 54%1.3x more volatile after
The VIX fell 9.0 percent across the window, a mild move. Read this as the market's demand for protection, not the direction of any single sector.
A ratio above 1.00 means the sector's daily-price swings widened after the event. Oil & gas producers became the most erratic at 1.46×, and 3 of 5 sectors traded meaningfully wider than they did before. Volatility is a separate signal from direction: a sector can end flat and still have traded wildly along the way.
Phases
| Sector | Peak Move | Peak Day | Reverted By |
|---|---|---|---|
| Oil tanker operators | -8.1% | Day 2 | Still elevated |
| Oil & gas producers | -8.1% | Day 2 | Day 5 |
| Defense contractors | -2.5% | Day 1 | Day 3 |
| Gold | -3.7% | Day 1 | Day 2 |
| Airline stocks | +7.6% | Day 2 | Day 5 |
The reaction peaked around day 2 on average. 4 of 5 sectors reverted inside the window, 1 were still elevated at the close. A reaction that reverts is a shock priced in; one that stays is a re-rating.
Historical Precedents
Companies Most Affected
Measured 10 days after the event. Reaction still developing; the full window is not yet complete.
This tool informs your decision. It does not give investment advice.