Trump renews tariff onslaught with three tariff actions in four days covering 99.4% of US imports
Measured from 25 Jul 2026 (event start), not the 25 Jul 2026 announcement
Semiconductors moved -10.0%, 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.
NVDA, AMD, INTC · down
What Happened
President Trump has resumed aggressive tariff escalation after a period of relative quiet during the Iran conflict that began in February 2026. Three separate tariff actions were announced and/or implemented in a four-day window, with new tariffs covering 99.4 percent of US imports. This represents comprehensive tariff coverage across consumer goods, electronics, automotive parts, agricultural products, and industrial inputs. The tariffs were announced amid the Supreme Court's previous strikes against Trump tariffs, suggesting administration strategy shift toward legislative or regulatory basis for duties. Timing suggests political positioning ahead of mid-term congressional elections, with tariff rhetoric indicating intent to pressure trade partners including allies.
Comprehensive 99.4% US import coverage effectively resets tariff regime after Supreme Court defeats; creates inflation shock to consumer goods and manufacturing inputs.
Three actions in four days as of July 25, 2026; effective dates vary by product category but most appear to take effect within 30-90 days.
Reporting indicates Trump administration implemented three separate tariff actions in four days ending approximately July 25, 2026, after relatively quiet period since February. Coverage is reported as 99.4 percent of US imports.
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.
Semiconductors moved most at -10.0% against the market, the direction you would expect from a tariffs. 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.
- Industrials25% → 41%1.7x more volatile after
- Semiconductors58% → 92%1.6x more volatile after
- Retailers24% → 27%1.1x more volatile after
- Broad market12% → 19%1.6x more volatile after
A ratio above 1.00 means the sector's daily-price swings widened after the event. Industrials became the most erratic at 1.65×, and 3 of 4 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 |
|---|---|---|---|
| Industrials | -2.6% | Day 4 | Still elevated |
| Semiconductors | -9.2% | Day 2 | Day 3 |
| Retailers | +4.2% | Day 2 | Day 3 |
| Broad market | +0.1% | Day 4 | Still elevated |
The reaction peaked around day 3 on average. 2 of 4 sectors reverted inside the window, 2 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.