Morgan Stanley Quantitative Warning: Momentum Collapse, Leveraged ETFs Massive Sell-off of U.S. Stocks, Few Retail Investors Taking Over!

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Momentum consensus trades experienced a "collapse" style reversal on February 5. Morgan Stanley believes that the rapid widening of declines was caused by concentrated unwinding of crowded long positions combined with passive selling pressure from leveraged ETF rebalancing, while retail buying—which should have cushioned the fall—was noticeably absent, resulting in insufficient marginal support.

This decline showed a "relatively restrained index, but intense internal market movement" structural characteristic: selling pressure was highly concentrated in the Nasdaq, technology, and semiconductor sectors, previously leading and crowded high-beta themes (such as AI, national security, Bitcoin mining stocks). In contrast, cyclical, chemical, and banking sectors performed better, showing obvious rotation.

In the outlook, a short-term technical rebound may occur, but Morgan Stanley is more inclined towards “selling into rallies”: because the deleveraging/rebalancing cycle may not be over, and retail funds remain weak ahead of tax season, making the next round of selling pressure harder to absorb. Historical data also shows that after such a strong single-day momentum crash, stock prices are most likely to fall over the next 1-2 months.

Index volatility is relatively restrained, but internal sectors swing wildly

The notable feature of this round of decline is a "disconnection between indexes and internal movements". Goldman Sachs pointed out that during the day, up to three-quarters of stocks outperformed the S&P 500, even as indexes continued to drop, indicating the pain was focused on a handful of crowded momentum trades (betting on the trend to continue, buying rising assets, selling falling ones).

The Goldman trading desk attributes this to reversal under rising volatility and technical divergence, rather than a single fundamental trigger.

Morgan Stanley trader Bryson Williams also noted in his closing remarks that the day looked more like a VaR shock-driven position rebalance, with selling mainly from concentrated unwinding of stocks that surged early in the year, rather than symmetric long/short simultaneous deleveraging.

Momentum collapse: crowded positions underwent concentrated unwinding, AI and high-beta themes came under pressure

Morgan Stanley data shows that the long-short momentum index MSZZMOMO fell about 7.7% in one day, an extreme move equivalent to 4 standard deviations, mainly dragged down by the long side. The momentum longs MSQQUMOL fell about 5.7%, while the momentum shorts MSQQUMOS rose only 1.9%, showing a one-sided "cutting longs not shorts" adjustment.

By theme, selling pressure was highly concentrated in previously leading, crowded sectors: AI, national security, Bitcoin mining stocks and other high-beta stocks became the core of the decline, while cyclical, chemical and banking stocks outperformed, creating an "anti-AI" rotation.

Leveraged ETF rebalancing amplifies selling pressure and creates risk of continued sell-off

According to Morgan Stanley's quant team estimates, leveraged ETF rebalancing resulted in about $18 billion in U.S. stock selling pressure, making it one of the key drivers of the day's decline (when stocks fall, leveraged ETFs must sell stocks to maintain leverage ratios), with the supply focused in Nasdaq, tech, and semiconductor sectors, causing single-day sell volume of more than $100 million for several hot stocks.

More importantly, this type of selling pressure has not ended. Morgan Stanley states that with volatility still elevated and stock leverage still near historical highs, the risk of ETF rebalancing triggered selling persists over the next week, with an estimated scale of about $10 billion. If deleveraging continues, volatility in high-leverage stocks will keep increasing.

Meanwhile, although options market makers remain net positive gamma (buying dips, selling rallies), the exposure has declined noticeably. Coupled with negative gamma from leveraged ETFs (chasing rallies, selling dips), the market overall is close to "net negative gamma", and this liquidity structure intensifies volatility and selling feedback loops.

Retail buying is absent: a vacuum of marginal buyers and worries over tax-season demand

In the past, retail buying on dips often cushioned price drops, but this time it's clearly missing. Morgan Stanley says that retail net buying intensity was low that day (only 16% of days over the past year were lower), and mainly occurred during the afternoon rebound.

At the same time, institutional net selling was strong (only 11% of days in the past year were higher), mainly during the morning session. This left consensus long positions lacking support at key moments.

Weak retail interest also directly suppressed the momentum factor. Morgan Stanley notes that retail favorites heavily overlap with the stocks used in momentum long/short strategies; so when retail stops buying, momentum strategies get dragged down as well. Morgan Stanley also points to seasonal trends: returns for retail-concentrated stocks in January are negatively correlated with returns in February and March, historically associated with liquidity squeezes during tax season.

What's next: a possible rebound, but Morgan Stanley advises selling into strength

According to historical statistics, Morgan Stanley notes that when the long-short momentum index MSZZMOMO falls 7% or more in a single day, with the long side especially weak (MSQQUMOL down 5% or more that day), it's usually a negative signal for the coming days. Median stock performance is typically negative over the next 1-2 months, only turning positive in the third month. Median peak-to-trough MSZZMOMO decline is around 22%.

Under this pricing framework, a short-term technical rebound may occur. The Goldman trading desk thinks a large momentum pullback like this could offer a buying opportunity in the mid-term, but Morgan Stanley's view is more cautious, mainly because positions have not been fully unwound, systemic supply has not landed yet, and retail investors as marginal buyers still "missing" may make the next round of selling even harder to absorb.

Risk Disclaimer and Exemption ClauseThe market is risky, investment requires caution. This article does not constitute personal investment advice and does not take into account individual users’ specific investment objectives, financial circumstances, or needs. Users should consider whether any opinions, views, or conclusions in this article are appropriate to their particular circumstances. Any investment made based on this is at your own risk. ```