The S&P 500’s materials sector suffered its steepest one-day decline in more than a year, sliding close to 3% and ranking as the weakest performer among the index’s eleven sectors.

Packaging Names Lead Losses

Smurfit WestRock and Amcor were among the hardest hit, tumbling more than 7% and 6% respectively, as the broader group came under heavy selling pressure.

Chemical Makers Buck the Trend

Not every materials name struggled. LyondellBasell and Dow Inc. both posted gains, rising more than 4% and 3% respectively, limiting the damage across the sector.

Comparable to April 2025 Selloff

If the decline held through the close, it would mark the sector’s worst single day since the tariff-driven selloff that rattled markets in early April 2025.

Broader Context

The move came the same day President Trump’s comments on trade and the Middle East roiled multiple corners of the market, adding to volatility across commodity-linked sectors.