US technology momentum stocks staged a dramatic rebound on Tuesday, July 21st.
The Morgan Stanley TMT Momentum Factor surged over 12% for its largest single-day gain on record, surpassing even the daily performances seen during the 2000 dot-com bubble.
The Goldman Sachs (GS) High Beta Momentum Long Index (GSCBHMOM) rose approximately 8.5%, marking its strongest daily performance since April 2025, while its Long/Short High Beta Momentum Index (GSPRHIMO) jumped 9.5%, its best showing since 2021 and nearing historically elevated levels last seen in 2003.
The Nasdaq Composite Index led the major indices with a gain of about 1.3%. The semiconductor sector was the primary driver, with the Philadelphia Semiconductor Index soaring 4.6% and the VanEck Semiconductor ETF climbing roughly 4.5%. Micron Technology (MU) surged over 10%, Intel gained about 8.6%, SanDisk rose around 14%, Cerebras Systems advanced approximately 18%, and Cipher Mining jumped more than 11%.
This powerful rally occurred after three consecutive days of declines and followed a cumulative 33% plunge in momentum stocks.
Drivers Behind the Surge: A Short Squeeze
To understand this rebound, one must first grasp the severity of the preceding decline.
According to Goldman Sachs data, high-beta momentum stocks had plummeted 33% in just a few trading sessions, representing one of the most severe drawdowns since the dot-com bubble burst. The Goldman Sachs High Beta Momentum Index had broken below its 200-day moving average, hitting its lowest point since January this year, with oversold conditions reaching their worst level since last August.
The deeper the fall, the greater the potential for a sharp bounce—a fundamental market dynamic.
This rebound was largely fueled by a "short squeeze." Investors who had heavily shorted momentum stocks, particularly trend-following traders in South Korea and Japan, suffered significant losses over the past two weeks. The South Korean market even witnessed large-scale margin call events that severely impacted local retail investors. As these shorts were forced to cover their positions, the resulting buying created a self-reinforcing upward spiral.
Analysis from Zacks Investment Research noted that Micron Technology had previously broken below the neckline of a "head and shoulders" pattern on its daily chart, a bearish technical signal. However, Tuesday's more than 10% surge pushed the stock back above that level. "False breakdowns often trigger sharp, opposite moves as late-to-the-party bears and short sellers get trapped."
Underlying Market Weakness Casts Doubt on Rally's Health
While the headline numbers appear impressive, the internal market structure remains unhealthy.
BTIG strategist Jonathan Krinsky analyzed that Tuesday's overall trading volume was low, with volumes for SPY, QQQ, and the S&P 500 cash index all 20% to 30% below their 20-day averages. Concurrently, while the S&P 500 index rose nearly 1%, the number of declining stocks still outnumbered advancing ones. This marks the highest frequency of such price-breadth divergences this year, and Tuesday saw another occurrence.
Goldman Sachs trader data showed total exchange volume was about 17% below the 20-day average, with market maker book liquidity at just $6.83 million and market activity scoring a mere 3 out of 10.
In other words, this rally resembles a concentrated surge in a few heavily weighted stocks rather than a broad-based recovery.
Bloomberg macro strategist Michael Ball analyzed, "It is premature to declare the correction over." Demand for put options on semiconductor ETFs and previous AI star stocks remains high. Negative Gamma exposure in the Nasdaq, semiconductor ETFs, and related stocks means market makers will exacerbate moves rather than dampen volatility—amplifying both rallies and declines.
Analyst Caution: Rally Hits Key Resistance, Advises Selling Into Strength
Not all analysts are optimistic about this rebound.
BTIG's Jonathan Krinsky issued a clear warning, advising to "fade" the rally. He had previously anticipated that a momentum stock rebound would face strong resistance in the 730-750 range, and Tuesday's move precisely pushed the GSCBHMOM index to the lower end of that zone.
Krinsky stated, "Extreme volatility, coupled with historic stock-level dispersion, is a signal the market is undergoing a full-blown correction." He expects high-beta momentum stocks to begin stalling as they move into the core of the resistance zone between Wednesday and Thursday.
Historically, since 1999, the High Beta Momentum Long Index has recorded single-day gains exceeding 7% while above its 200-day moving average only ten times. Three occurred this year, three in early 2021, and three in early 2000. Krinsky pointed out this data "speaks to both the rarity of the move and the continued statistical echoes of the 1999-2000 period we are seeing."
Contrasting View: Momentum Sell-off Nearing End, Opportunity to Add
In contrast to BTIG's caution, both Goldman Sachs and UBS believe the momentum sell-off is nearing its end and suggest investors seize the opportunity.
Goldman Sachs' Julia Mensch noted in a report that the firm had signaled last week the momentum sell-off was "entering the later stages." She wrote, "With positioning already significantly cleared (Goldman Sachs Prime Brokerage data shows momentum exposure at the 64th percentile over the past year and 93rd percentile over five years), and no new fundamental catalyst behind the sell-off, we believe momentum has room to revert to its longer-term trend. This sell-off may be a good opportunity to add momentum exposure or buy AI stocks on weakness."
Michael Romano, Head of Hedge Fund Equity Derivatives Sales at UBS, expressed a similar view in a client note, citing improving AI fundamentals as a buy signal. However, he advised investors to "build positions gradually, rather than going all-in at once."
Romano wrote, "Momentum de-risking was and remains a compelling thesis. Scaling in is prudent." He expects the momentum sell-off to bottom by the end of July, if it hasn't already, adding, "Once the turn happens, I expect liquidity to drive prices to overshoot to the upside."
Nevertheless, Goldman Sachs maintains a degree of caution. Given the recent extreme volatility and the dense earnings season ahead, the firm recommends investors gain exposure through "limited-loss structures" rather than holding outright long positions.
Earnings Season Emerges as the Next Critical Test
The sustainability of this rebound largely hinges on this week's corporate earnings reports.
According to Reuters, 113 S&P 500 companies, representing about 18% of the index's market capitalization, are scheduled to report this week. Among them, Alphabet's (GOOGL) earnings are seen as "the most important data point of the week," with the market keenly focused on its full-year 2026 capital expenditure guidance—widely expected to be raised—which will provide crucial clues about the trajectory of AI spending.
Adam Turnquist, Chief Technical Strategist at LPL Financial, stated, "The focus now isn't just on the total capex number. The next focal point will be return on investment and the quality of spending, which we believe will become a core topic in the second half."
He further noted, "We expect continued volatility in the semiconductor sector as overbought conditions need to be digested, profit-taking pressures emerge, and crowded positioning is unwound. Fundamentally, we don't believe anything has substantively changed."
So far, 66 S&P 500 companies have reported, with approximately 88% exceeding analyst profit expectations. 3M surged over 9% and General Motors gained about 5% on the day, both buoyed by better-than-expected results.
Bond Market and Macro Concerns Linger
While equities celebrated, the bond market issued warnings.
US Treasury yields moved higher across the curve, with the short-end 2-year yield rising 5 basis points and the long-end 30-year yield up 2 basis points. Long-term yields climbed to two-month highs, erasing the bond gains spurred by last week's lower-than-expected inflation data.
Rising oil prices were a contributing factor. Brent crude futures closed back above $90 per barrel for the first time since June 11th. Tensions in the Middle East escalated as Yemen's Houthi group announced a blockade of the southern Red Sea entrance, causing two oil tankers carrying Saudi crude to turn around. Kpler's MarineTraffic data showed that even before the blockade announcement, cargo loadings passing through the Bab el-Mandeb Strait had fallen 34% over the past two weeks.
Izaac Brook, Rates Strategist at RBC Capital Markets, stated, "Today's market move is primarily a function of continued strength in energy prices. Rate volatility was amplified by breaks through watched technical levels—4.20% on the 2-year and 4.60% on the 10-year—and the typically low-liquidity summer trading environment."
Bloomberg's Cameron Crise warned that long-bond yields are at a critical juncture where 5% could shift from resistance to support, with the next obvious target being 5.5%—"That would be a shock to equities, especially if an upside economic surprise drives yields higher and negatively impacts stocks."
Goldman Sachs IG Credit Head Kevin Boova also cautioned that credit spreads for mega-cap tech companies have hit new highs, noting "the hyperscale cloud/AI/data center space feels a bit fragile again."
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