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Citi Sees Growing Short-Squeeze Risk as U.S. Market Positioning Improves

Fiona Craig

Sat, August 15, 2026 at 4:30 PM GMT+3 4 min read

Short sellers in U.S. equities are becoming increasingly exposed to further market gains, according to Citi, as investors rebuild risk positions across major developed markets. Recent flows have primarily reflected fresh buying rather than investors simply closing bearish bets, suggesting confidence is gradually returning to U.S. and European equities.

Investors add new long positions in U.S. stocks

Citi strategists said positioning strengthened across all major U.S. equity indices during the latest week.

Importantly, the improvement was driven predominantly by investors establishing new long positions rather than covering existing shorts.

The Nasdaq and S&P 500 registered similar week-on-week improvements, with positioning in both indices moving out of bearish territory and returning to a net long stance.

The Russell 2000 remains the most extended U.S. index covered by Citi, indicating that positioning in smaller companies has already moved further than in the large-cap benchmarks.

S&P 500 shorts face mounting pressure

The recovery in U.S. stocks has increased pressure on investors maintaining short positions.

Citi said average losses across S&P 500 short positions are now elevated, "leaving the sizeable short base vulnerable to forced covering should markets grind higher."

If equities continue advancing, short sellers facing mounting losses may be forced to buy shares to close their positions.

That activity could itself generate additional upward pressure, potentially accelerating the market's advance through a short squeeze.

Citi said the current imbalance between potential gains and losses means positioning risk is "skewed toward additional squeeze-driven flows."

Fresh risk-taking drives positioning recovery

The broader message from Citi's positioning data is that investors are becoming more willing to take risk.

Rather than the recent improvement simply reflecting bearish traders exiting losing positions, new capital is being deployed into long equity positions.

That distinction is important because fresh long accumulation can indicate greater underlying confidence in the market outlook.

Citi said this has been the dominant pattern over the past week, particularly across the United States and Europe.

Europe records strong positioning rebound

European markets produced one of the clearest recoveries in global positioning, according to Citi.

Weekly flows were dominated by new long positions, pushing positioning in the EuroStoxx 50 and FTSE towards moderately bullish levels.

The DAX has also continued recovering from previous weakness and is now more closely aligned with the constructive positioning already visible among European banking stocks.

Europe recorded the strongest overall positioning recovery among developed markets, accompanied by an improvement in positioning profit and loss.

European investors become increasingly constructive

The shift towards new long positions suggests investors are showing greater confidence in European equities rather than merely reducing bearish exposure.

Improving profit-and-loss conditions could reinforce that trend if existing positions continue generating gains.

The development also makes European positioning more balanced following earlier periods of weakness, particularly in Germany.

Continued inflows could strengthen the recovery further, although increasingly bullish positioning could eventually reduce the amount of additional buying available from investors moving back into the market.

Australian and Chinese positioning improves

Outside the U.S. and Europe, Citi identified improving positioning across parts of the Asia-Pacific region.

Positioning strengthened in Australia's S&P/ASX 200 as well as China's A50 index.

These improvements indicate that the broader rebuilding of risk exposure is not confined to Western developed markets.

However, conditions remain uneven across Asia, with South Korea standing out as an important exception.

KOSPI short positions create reversal risk

Positioning in South Korea's KOSPI continued to deteriorate, leaving the market with a heavily one-sided short book.

Citi believes this creates the potential for a sharp reversal if investor sentiment improves.

The bank warned that the KOSPI positioning imbalance "is creating the potential for abrupt covering flows if sentiment improves."

A sudden change in sentiment could therefore force short sellers to unwind bearish positions rapidly, potentially amplifying any rebound in South Korean equities.

Short squeezes could provide additional market fuel

Citi's latest positioning analysis points to a generally more constructive environment across global equities.

Fresh long positions are being established in the U.S. and Europe, while positioning has also strengthened in Australia and China.

At the same time, sizeable short positions remain vulnerable in several markets.

For the S&P 500 in particular, further gradual gains could increase losses for bearish investors and trigger forced buying, adding another potential source of support for the rally.

The combination of renewed risk-taking and vulnerable short positions means future gains could increasingly be reinforced by squeeze-driven flows if markets continue moving higher.

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