S&P 500 rally faces AI‑driven valuation risks as analysts warn of earnings bubble

The S&P 500 has risen roughly 9 % year‑to‑date, posting its strongest quarterly gain since 2020 and a 10.2 % return in the first half of 2026. The advance has been led by technology and artificial‑intelligence‑related stocks, with memory‑chip makers such as Sandisk, Micron and Intel among the best‑performing constituents.

Analysts are increasingly wary of the rally’s sustainability. Bank of America cautions that elevated valuations and heavy AI‑related capital spending could trigger a 5 % correction by year‑end, warning that speculation is at extreme levels and free‑cash‑flow generation is weakening for the sector’s “hyperscalers.” Similar concerns are echoed in Germany, where analysts note an earnings‑growth forecast of about 25 % for S&P 500 companies and warn that the rapid rise in profit expectations may be unsustainable.

Other market participants remain bullish: JPMorgan maintains a higher year‑end target, and Yardeni Research projects a continued climb to 8,250. Meanwhile, the Federal Reserve is expected to raise rates three times in 2026, adding further pressure on equities. Chip stocks have rebounded in recent sessions, and broader market sentiment remains mixed as investors balance strong AI‑driven earnings against valuation and monetary‑policy risks.