Despite the S&P 500 Index rising 18% since late March, short positions in the US stock market have surged to record highs, reflecting concerns about the sustainability of the rally.
Data from S3 Partners shows that short interest in S&P 500 components is nearing 3.79% of free float, the highest level recorded by the firm since 2010. The short interest ratio for Russell 3000 Index components has climbed even higher to 6.3%, also setting a new record. Concurrently, total short interest across US and Canadian markets has increased to $2.13 trillion, another peak since records began in 2010. The median short interest as a percentage of market capitalization for S&P 500 stocks has risen to 3%, the highest since late 2011.
Record Short Bets Across the Board
The expansion in bearish wagers is broad-based. S3 Partners data indicates that total US short interest surpassed $2.13 trillion in May, setting a new high since the firm began tracking the data in 2010. Goldman Sachs prime brokerage statistics reveal the median short interest for S&P 500 stocks has reached 3% of market cap, the highest level since 2011.
From a broader perspective, data from Global Markets Investor shows the median short interest for S&P 500 components is around 3.7%, an 11-year high; short interest for the Nasdaq 100 Index is about 2.7%, a 6-year high; and short interest for the Russell 2000 Index is close to 5.0%.
Data compiled by Reynolds Strategy shows that short interest for NYSE-listed stocks has been climbing since February, reaching 9% of the float in late June, a record high. For comparison, this ratio was only 5% during the global financial crisis and around 6% during the pandemic. The firm's chief market strategist, Brian Reynolds, described the recent surge in short positions as "vertical."
Short concentration at the individual stock level is even more striking. S3 Partners data shows at least 16 stocks have short interest exceeding 20% of their float. Among them, short interest in SpaceX (SPCX.US) has skyrocketed from $4.5 billion on June 15 to $25 billion, representing about 29% of its publicly available float. Ihor Dusaniwsky, Managing Director at S3 Partners, stated, "Short selling activity has increased, and the range of stocks being shorted has also expanded."
Primary Battleground for Shorts: AI and Semiconductors
The focus of short bets is clearly directed towards the AI and semiconductor sectors. S3 Partners data indicates the stocks with the largest short interest (in dollar terms) include the "Magnificent Seven" tech giants and chipmakers like Micron Technology (MU.US) and Broadcom (AVGO.US).
Michael Burry, the real-life inspiration for *The Big Short*, recently disclosed a new round of bearish bets, with a short list including NVIDIA (NVDA.US), Applied Materials (AMAT.US), Tesla (TSLA.US), Caterpillar (CAT.US), and the iShares Semiconductor ETF. Burry explicitly stated he has established short positions centered on the AI and semiconductor sectors.
Short sellers have not been without gains in this area. According to Bespoke Investment Group data, the most heavily shorted stocks in the Russell 3000 Index—such as Hertz Global Holdings (HTZ.US) and Eos Energy Enterprises (EOSE.US)—have fallen by an average of 15% this year, while all other stocks in the index have gained nearly 21%. Hertz has slumped 65% year-to-date, with about 79% of its shares sold short, delivering substantial returns for shorts.
SpaceX has been a "cash machine" for short sellers. Since its IPO in June, its stock price has fallen below the $135 offering price, generating nearly $5 billion in paper profits for shorts. Dusaniwsky revealed that among companies with less than a month of public trading, SpaceX's short interest ranks among the highest.
Multiple Risks Fueling Short Bets
Doubts about AI investment returns are a core concern. Over the past eight weeks, hedge funds have sold tech stocks at an unprecedented pace, setting a record for the cumulative selling ratio. Last week saw a sharp sell-off in US AI and tech stocks, with the Nasdaq falling 2.9% for the week and the Philadelphia Semiconductor Index dropping nearly 10%.
Morgan Stanley's US Tech Momentum Factor has been in a drawdown for 17 trading days, falling 40% from its peak, marking the fastest drawdown on record. Goldman Sachs characterized the Philadelphia Semiconductor Index's decline of over 20% from its June high, entering a technical bear market, as "one of the largest momentum strategy unwinds on record."
The main cause is not deteriorating fundamentals but the large-scale unwinding by hedge funds and mutual funds of the year's hottest pair trade: long semiconductors, short hyperscale cloud providers. Goldman Sachs partner Mark Wilson pointed out that the root of this sell-off lies in crowded positioning and concentrated leverage.
Geopolitical risks are also a significant factor. The US has conducted airstrikes against Iran for several consecutive nights, threatening shipping security in the Strait of Hormuz. Continued tit-for-tat attacks between the US and Iran have pushed WTI crude oil prices back above $80 per barrel. Geopolitical conflicts, by raising oil prices and inflation expectations, exert pressure on overall risk assets. Analysts note that escalating Middle East tensions, rising oil prices, and the approaching Fed meeting will collectively determine future asset price movements.
Earnings season uncertainty is the most immediate short-term catalyst. This week, Alphabet and Tesla will be among the first to report quarterly results. Some analysts warn that any signal from Google about cutting AI investment budgets could severely impact AI-related trades. Joseph Saluzzi, partner at Themis Trading, said, "The increase in short interest indicates that investors are concerned."
Bull-Bear Standoff: Two Forces Offset Each Other
The surge in short positions has not triggered a market crash. The S&P 500 has been oscillating around the 7500 level since first touching it on May 14. This resilience, defying expectations of a drop, stems from the simultaneous presence of bullish forces.
Reynolds noted that investor buying is likely offsetting the elevated bearish sentiment—it is precisely these two countervailing forces that have kept the stock market range-bound over the past month, thereby suppressing speculative behavior that might otherwise pave the way for a rebound. He stated in a report, "We still believe that retail investors will continue to push stocks to new highs, and that in any downturn, stock buybacks will accelerate, helping stocks recover from lows."
S3 Partners data shows that investors have roughly twice as much invested in long positions as in short positions. This means the market is in a fragile equilibrium: the balance could be broken at any moment if bullish forces weaken or bearish forces gather further strength.
Meanwhile, hedge funds are engaging in contrary actions. Goldman Sachs data shows that recently, hedge funds covered short positions in US single stocks at the fastest pace in three months. This complexity in the bull-bear struggle indicates the market is not simply "bullish" or "bearish" but is searching for direction amid high uncertainty. The Information Technology sector saw the largest net buying, with fund managers concentrating on covering semiconductor shorts.
Earnings Season: Judgment Day or Carnival for Shorts?
This week's earnings reports from tech giants will be a key variable determining the fate of short sellers. According to FactSet data, the Magnificent 7 as a whole are expected to post a 31.1% year-over-year increase in Q2 earnings, higher than the 22.8% for the rest of the S&P 500. Profit growth expectations are strong—but the problem is that the market has already priced in a lot of good news.
Michael Hartnett, chief investment strategist at Bank of America, warned that the bank's Bull & Bear Indicator has risen to an extreme historical level of 9.6, indicating the market is in a state of "extreme positioning." A Citigroup quantitative report shows the Nasdaq Index is only about 1% away from triggering systematic selling by Commodity Trading Advisors (CTAs).
Goldman Sachs believes the recent tech stock plunge stems from crowded positioning and concentrated leverage, not deteriorating fundamentals. The unwinding process is "near completion," but there is a lack of short-term catalysts for a reversal, and valuations remain high with structural market risks persisting.
JPMorgan is more cautious, noting that while equity long-short fund leverage, after reaching its highest level since 2017 in June, has retreated in July, "this adjustment is part of a broader deleveraging process." The bank expects tech stocks to face pressure for several more months.
The Wall of Fear in a Bull Market
S&P 500 short interest at 3.79%, Russell 3000 at 6.3%, NYSE overall at 9%—these numbers collectively paint an unprecedented picture of bearishness. In a nearly four-year bull market, shorts have consistently been at a disadvantage, yet they have not retreated but instead increased their bets.
The essence of this bull-bear standoff is a fundamental disagreement over the AI investment cycle. Bulls believe AI will reshape the global economy like the internet, with massive capital expenditures ultimately yielding excess returns. Bears worry that AI infrastructure buildout has entered a "cash-burning mode," and uncertainty about returns on capital is accumulating.
Earnings season will provide the latest evidence. If tech giants deliver better-than-expected results and raise AI investment guidance, short sellers could face a massive short squeeze—Goldman Sachs previously noted that the $2.13 trillion in short interest itself could become fuel for a market rally. If results disappoint or signal cuts to AI investment, shorts' bets will be richly rewarded.
Saluzzi stated, "Earnings season and the geopolitical situation will be important factors influencing the market for the rest of the month."
With the $2.13 trillion "powder keg" of short positions looming above, a breakout in either direction could trigger sharp, one-sided volatility—whether a short-squeeze-fueled surge or a panic-driven sell-off.
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