AI trade got too crowded, and the unwind began

When the crowd heads for the door

Momentum has been the market’s favorite espresso shot all year — until Thursday, when everyone seemed to get the jitters at once. ETFs like MTUM, PDP, and QMOM sold off as the AI and high-beta growth names they’d been leaning on suddenly reversed course.

The setup was almost too neat: months of gains, a pile-on into the same winners, and then a sharp reminder that crowded trades can get messy fast. MTUM fell 1.8% on the day, its worst drop since late March, while Goldman Sachs’ high-beta momentum basket sank 8% in one of its ugliest sessions in years.

Why investors care

This wasn’t just a random wobble. The sell-off hit the exact pocket of the market that had become the most overloaded: AI-linked and software names with sky-high expectations and not much room for disappointment. Goldman said momentum positioning has now hit the 100th percentile versus the past five years, which is Wall Street’s polite way of saying, “everyone is standing in the same doorway.”

A few moving parts made the unwind worse:

• Stronger-than-expected software earnings gave traders a reason to rotate
• AI winners pulled back after a massive run
• Momentum strategies, by design, keep adding to what’s already working — until it stops working

Dip or trap?

Goldman’s historical playbook is the part that may calm nerves. Since 2006, similar momentum crashes have been followed by average gains of 1.45% over the next week and nearly 23% over the next year. So yes, Thursday looked ugly. But it also fits the classic market script where the crowd gets spooked, sells first, and thinks later.

That’s why MTUM, PDP, and QMOM were firmer on Friday even after Thursday’s bruising. Big picture: the AI trade may still be alive, but the market just reminded everyone that even the hottest trend can get a very human case of indigestion.