Semiconductor companies set to boost S&P 500 earnings growth as chip sector hits record weight

The S&P 500’s earnings story this quarter has a very specific main character, and it runs on silicon. Semiconductor and semiconductor equipment companies are projected to post 133% year-over-year earnings growth in Q2 2026, according to LSEG data. That single sector is expected to account for roughly 44% of the entire index’s earnings gains for the quarter.

The overall S&P 500 is forecast to deliver 26% earnings growth year-over-year. The semiconductor sector isn’t just participating in the rally. It is the rally.

The numbers behind the chip boom

LSEG’s earnings research head Tajinder Dhillon highlighted the outsized contributions of companies like NVIDIA, AMD, Broadcom, and Micron in driving these numbers.

The sector’s dominance is showing up in index composition too. As of mid-June 2026, semiconductor stocks hit a record 18.8% of the S&P 500’s total market capitalization, according to data cited from Bloomberg, S&P, and Citadel Securities.

Earnings results from foundry giants are backing up the thesis. TSMC reported Q2 net profit up 77% as of July 16, 2026. Samsung’s operating profit surged a staggering 19x in early July, though the stock market’s reaction to that number was more measured than the headline deserved.

A July to forget for chip stocks

Despite year-to-date gains of 65% on the PHLX Semiconductor Index (SOX), compared to the S&P 500’s 9%, July has been brutal. The SOX dropped more than 18% during the month, erasing a significant chunk of gains in a matter of weeks.

When one sector is responsible for 44% of earnings growth and simultaneously experiencing double-digit drawdowns, portfolio managers start losing sleep. LSEG’s data shows the sector’s contribution is climbing while major tech companies outside the chip space are seeing their relative contribution to index earnings decline.

What this means for investors

The concentration risk here is hard to ignore. When a single sector approaches 19% of index market value and drives nearly half of quarterly earnings growth, any disruption to that sector’s trajectory would ripple across the entire market.

A 65% year-to-date gain followed by an 18% monthly decline means investors who entered at the wrong time are sitting on meaningful losses, even though the broader trend remains sharply positive.

Investors watching names like NVIDIA and AMD should pay close attention to forward guidance in upcoming earnings calls. The 133% backward-looking growth number is already priced into expectations. What matters now is whether management teams signal sustained AI demand into the back half of 2026, or whether the tone shifts toward caution.

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