US Stocks Hit New Highs But Only 20 Stocks Reach Top - Highly Similar to the 2000 Internet Bubble Top
N.R. Finch
The S&P 500 closed at a record high on the last trading day of May, yet only 20 constituents hit their own all-time highs — 13 of them AI-linked. BofA strategist Michael Hartnett flags the pattern as nearly identical to the March 2000 dot-com top, warning the bull run is nearing its end.
A record high — so why did only 20 stocks keep up?
On the last trading day of May, the S&P 500 closed at a record high — but only 20 of its constituents simultaneously touched their own all-time highs.
Of those 20, 13 are directly tied to AI. This means → the index's "new high" was almost entirely carried by a single AI storyline; the other 480-plus stocks did not follow.
In plain terms = the headline says "record high," but the vast majority of stocks didn't rally. A handful of AI leaders dragged the index up on their own.
How close is this to the 2000 dot-com top?
BofA strategist Michael Hartnett noted that in March 2000, when the dot-com bubble peaked, roughly 20 stocks were likewise the only ones hitting record highs.
He believes the current "speculative price action" has probably not ended yet, but the signal suggests the rally is approaching its final phase.
This reflects a recurring pattern: late-stage bull markets are not broad — capital floods into a handful of star names, pushes the index to a peak, and then the cycle ends.
How big were the semiconductor gains, and where did the money go?
The main driver in May was semiconductors, especially memory-chip makers: Micron surged 85% in a single month, SK Hynix rose 81%, AMD 50%, Samsung 43% — all approaching or reaching trillion-dollar market caps.
The Nasdaq Composite gained 25% across April and May combined, its best two-month stretch in over twenty years.
This means → capital did not spread evenly across tech — it concentrated heavily in AI-linked chip companies. The more concentrated the gains, the greater the pullback risk.
Market breadth is deteriorating — what does that signal?
The advance-decline line — a running tally of the gap between daily advancers and decliners — has weakened steadily since mid-April, flashing a bearish signal.
BCA Research data show that as of May 20, only about 55% of S&P 500 constituents traded above their 200-day moving average.
In plain terms = when half the index can't hold above its long-term average, the fundamentals of most companies do not support the index's headline level. The surface looks strong; the interior is fragile.
What is BofA telling clients to do?
Hartnett advises clients to shift to defensive positioning as soon as possible.
His "post-bubble playbook": go long bonds while also going long the defensive sectors that badly lagged during the bubble's final stage.
This means → he expects central-bank tightening and rising rates to ultimately end this bull market — the call now is to reduce offense and add defense.
Content is for reference only, not financial advice.