The scariest chart on Wall Street right now is actually one of the best buying signals in years (Save this). The Morgan Stanley Tech Momentum Index just hit a 17 day rate of change of -35.9%, the worst reading in the index's entire 27 year history. The Goldman Sachs High-Beta Momentum Index is down -24% month-to date, the worst performance since April 2009. Before you panic, you need to understand what these numbers actually measure because this is not the AI buildout collapsing but rather a momentum factor unwind and those are two very different things. A momentum strategy is simple, buy whatever has gone up the most, short whatever has gone down the most and in H1 2026, that strategy returned a historic 57% because AI stocks went nearly straight up. When a trade gets that crowded, Goldman tracked momentum positioning at the 100th percentile of the last five years, it gets fragile. One trigger causes every fund running the same playbook to sell at the same time and you get a cascade that has nothing to do with the actual businesses underneath. The triggers here were textbook, low holiday week liquidity, end of quarter rebalancing, profit taking after a record first half and a widely misread headline about Meta and data center capacity. The fundamental view remains positive and while JPMorgan said buy the dip and UBS called it an orderly de-risking exercise, not a forced liquidation. The data that actually matters hasn't moved. Hyperscalers are still guiding to $1.4 trillion in capex by 2028, a number Morgan Stanley just raised 9-10% for 2027 and 2028. Micron's entire HBM4 supply for 2026 is already sold out under long-term contracts, Nebius has $12 billion locked in from Meta and $17.4 billion from Microsoft. None of those contracts changed because a momentum index printed -35%. Goldman's own historical data shows that momentum selloffs of this magnitude since 2006 were followed by average gains of 1.45% the following week and nearly 23% over the next year. The worst momentum reading in 27 years sounds terrifying but what it actually means is that the trade got too crowded after a historic run and now it's flushing out the weakest hands. The only question left is simple, are you buying from the weak hands or are you one of them? The biggest opportunities are often created by the biggest overreactions and make sure to follow me @MelvinInvests for more.