Short Interest in US Stocks Hits Record High Amid Market Rally

Short interest in U.S. stocks has reached unprecedented levels, a sign that some investors are increasingly betting against the market even as it posts significant gains. This divergence highlights a growing tension between bullish momentum and bearish sentiment among market participants.

Record Bearish Bets

Data from financial analytics firm S3 Partners LLC shows that bearish wagers against broad market indexes have hit all-time highs. The firm's analysis, which dates back to 2010, reveals key metrics:

• Short interest in S&P 500 Index stocks is now near 3.79% of the free float, a record high.
• For the broader Russell 3000 Index, short interest recently reached 6.3% of free float, also a record.

This trend has emerged despite a strong market performance, with the S&P 500 having rallied 18% since late March. The index did, however, pull back 1.6% last week amid concerns over technology spending and competition.

Market Context and Positioning

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"Short selling has increased and the breadth of names shorted has increased," said Ihor Dusaniwsky, manager of predictive analytics at S3 Partners. This indicates that bearish sentiment is not confined to a few specific stocks but is becoming more widespread.

Despite the rise in short positions, the market's nearly four-year bull run has forced many short sellers to hedge their bets. According to S3 Partners, investors still hold approximately twice as much capital in long positions as they do in short positions, suggesting that overall market positioning remains net-long.

A High-Profile Target

One notable example of concentrated short interest is Space Exploration Technologies Corp. (SpaceX). Before a recent stock decline, the company was the ninth-most shorted in the U.S. market.

Bets against SpaceX totaled $25 billion, which represents nearly 29% of its publicly available shares, or float. These bearish positions have been profitable so far this year, with short sellers realizing nearly 28%, or $4.8 billion, in mark-to-market gains, according to S3 Partners.