Semiconductor companies are on track to become the single biggest driver of S&P 500 earnings growth, overtaking Amazon, Google, Meta, and Microsoft. According to the Kobeissi Letter, those four megacap tech names contributed about 34% of the index's year-over-year earnings-per-share growth in the first quarter of 2026, while semiconductor companies contributed another 31%. Combined, those two groups accounted for 65% of all S&P 500 earnings growth in Q1, up sharply from 52% in the same quarter a year earlier, while every other company in the index made up just 36% of the growth between them. The mix is expected to tilt further as the current earnings season plays out. Analysts project semiconductor companies will add another 17 percentage points to their share in Q2 2026, pushing their contribution to a record 48%, while the combined share from Amazon, Google, Meta, and Microsoft is expected to fall by 25 percentage points to roughly 9%. If that plays out, it would mark a clear handoff, from software and cloud giants funding the AI buildout to the chipmakers actually selling the hardware, as the market's main source of profit growth, a concentration that leaves the index increasingly dependent on a narrow slice of the semiconductor supply chain.
Why it matters · When two sectors already supply 65% of index earnings growth and chips alone are set to jump to 48% next quarter, the S&P 500's health starts to hinge on a handful of semiconductor names delivering, meaning any stumble in chip demand or AI capex would hit the whole index much harder than a typical earnings miss.
Worth asking · Semiconductor companies are set to supply almost half of the S&P 500's earnings growth next quarter. Is that a healthy sign the AI buildout is finally showing up in hard profits, or does it mean the index's gains now rest on a dangerously narrow base?