AI Chip Exposure Drives Almost All Recent S&P 500 Gains, Raising Investor Concerns

Summary

• NVIDIA (NVDA) delivered a 102% gain over two years despite a 33× trailing earnings multiple and $119 billion in supply commitments; AMD (AMD) rose 181% on a 156× forward P/E with a $762 billion market cap; the SPDR S&P 500 ETF (SPY) posted a 41% return, which would have been just 16% without exposure to AI infrastructure firms.

• The S&P 500’s 26‑point outperformance stems solely from AI‑linked megacaps trading at stretched valuations, even as the 10‑year Treasury yields 5%, consumer sentiment has slipped into recessionary territory, and the VIX remains below its 12‑month average, raising concentration risks for retirement portfolios.

A striking data point for passive investors: on the Retire SMART Podcast episode 416, the host calculated that removing AI‑related holdings from the S&P 500 would reduce the 22‑month return from 42% to roughly 16%.

The 26‑point gap is confirmed by the SPDR S&P 500 ETF Trust (NYSEARCA:SPY), which delivered a 41% return over the two‑year period ending May 22, 2026. Excluding AI infrastructure exposure reveals an index that barely outperformed cash.

How Passive Investing Turned into a Concentrated AI Bet

SPY’s composition illustrates the mechanism: NVIDIA accounts for 8% of the index, Microsoft 5%, and Broadcom 3%; in the Invesco QQQ Trust the concentration is even sharper — NVIDIA alone holds 10%, Microsoft 9%, and Broadcom 6%. Market‑cap weighting amplified both the upside and the associated risk.

The two‑year price performance of these companies clarifies the source of the index’s returns:

The NVIDIA Anchor

NVIDIA sits at the heart of the concentration narrative, boasting a $5.22 trillion market capitalization. Its fundamentals are outstanding: Q1 FY2027 revenue reached $81.6 billion, a 85% year‑over‑year increase, driven by 199% growth in data‑center networking. CEO Jensen Huang warned investors that “The buildout of AI factories, the largest infrastructure expansion in human history, is accelerating at extraordinary speed.”

The risk profile is equally pronounced. NVIDIA disclosed $119 billion in total supply commitments, and Q2 FY2027 guidance now excludes all data‑center compute revenue from China. Reddit sentiment turned bearish on May 23‑24, with scores in the 30‑41 range despite the earnings beat, illustrating a market dynamic where strong results no longer reliably boost the stock.

The Valuation Stretch Across the Cohort

AMD trades at a forward P/E of 67 on a $762 billion market cap, with Lisa Su highlighting a partnership with Meta to deploy up to 6 GW of Instinct GPUs. Broadcom, with a $1.96 trillion market cap, targets $100 billion in AI revenue by 2027. Microsoft, at 25× trailing earnings, offers a relative bargain, having built an AI run‑rate exceeding $37 billion — a 123% year‑over‑year increase. Palantir stands out with a trailing P/E of 154 and 63× sales, despite a Rule‑of‑40 score of 127%.

The Macro Setup Argues for Risk Review

Three macro indicators tighten the retirement narrative: the 10‑year Treasury yield sits at 5%, near a 12‑month high in the 98th percentile, providing a compelling risk‑free alternative for equity allocations; the VIX at 16.76 is below its 12‑month average of 18.2, suggesting complacency; and University of Michigan consumer sentiment fell to 49.8 in April 2026, a recessionary reading and a 12‑month low.

The host’s directive is clear: “Make sure you understand how much risk your portfolio carries because we have enjoyed strong returns at historic highs; you may now be assuming more risk than you are comfortable taking.” For investors nearing retirement, the critical question is what share of an S&P 500 fund, a target‑date fund, or a 401(k) default is allocated to a handful of AI‑linked megacaps. If the past two years’ gains felt effortless, the concentration that generated them warrants deliberate sizing.

Source link