S&P 500's worst day since October has a major asterisk

The article explains that the S&P 500’s 2.6% drop on June 5 was driven less by broad market weakness than by a sharp selloff in a handful of mega-cap tech and chip stocks. Stronger-than-expected U.S. jobs data pushed Treasury yields higher and reduced expectations for Fed rate cuts, pressuring expensive growth names. The piece highlights that cap-weighted vehicles like SPY and VOO were hit much harder than the equal-weight approach, represented by RSP, because the largest stocks dominate returns. It also notes that the decline was concentrated in names such as Micron, Marvell, Broadcom, and Lululemon, underscoring how much concentration risk has built into the index. Overall, the market message is that the S&P 500’s recent weakness may be more about valuation sensitivity and sector concentration than a broad-based deterioration in equities.