Momentum Signal Outpaces Dot‑Com Surge
S&P 500 Momentum Index Jumps 34% in Two Months
The S&P 500 Momentum Index rose 34% over the last two months, the largest two‑month gain recorded since 1995. Business Insider reported that the rally has now surpassed the momentum levels seen during the late‑1990s dot‑com era, a benchmark often cited for speculative excess.
"The surge is an example of excessive optimism percolating in the market," – Philip Straehl, Morningstar.
Morningstar’s chief investment officer for its wealth division added that the index is “one of several signals flashing excessive investor optimism right now.” The comment underscores a broader concern that sentiment‑driven buying may be decoupling from underlying fundamentals.
Given the rapid appreciation, some market participants view the index as an early warning sign that investor sentiment may be pricing in overly optimistic expectations for future earnings.
Implications for Investors
Valuation risk: Rapid, sentiment‑driven price moves can inflate valuations, leaving portfolios vulnerable if momentum wanes.
Historical caution: The last comparable momentum spike in 1995 preceded a market correction, reminding investors that extreme optimism often precedes pullbacks.
Portfolio balance: Asset managers may consider tempering exposure to high‑momentum strategies with defensive positions or diversified assets.
Analysis: While a 34% rise signals strong short‑term upside, the consensus among Morningstar analysts suggests that the current optimism may be unsustainable. Investors are advised to monitor not only the Momentum Index but also complementary sentiment gauges, such as earnings revisions and credit spreads, to gauge the durability of the rally.
Until the momentum signal stabilizes, investors should monitor broader market breadth and valuation metrics to gauge whether the optimism remains justified.
Source: Business Insider, A stock market momentum signal has surpassed dot‑com levels as bubble warnings pile up, published July 9 2026.