The Stock Market Keeps Hitting Records, but Investors Are Betting Against It at Record Levels
The S&P 500 — a basket of 500 large U.S. companies used as a benchmark for the overall stock market — closed at a new all-time high 25 times in 2026 through Tuesday, August 4, according to Bloomberg Terminal data. But two other numbers tell a very different story underneath.
Short interest, which measures bets that stock prices will fall, reached 3.79% of available shares in July 2026. That is the highest level ever recorded, according to S3 Partners LLC. Separately, Evercore ISI reported that 121 companies in the S&P 500 — roughly one in five — have been moving in the opposite direction of the overall market over the past six months. That is also a record.
Think of the S&P 500 like a team sport. The scoreboard says the team is winning, but a large portion of the players are running the wrong way.
These two facts do not contradict each other. The 25 record highs reflect the combined performance of all 500 companies, weighted by size. The companies pushing the index to new highs are mostly large, well-known firms. The record short interest reflects bearish bets concentrated in different companies — many of which may not be the ones lifting the index. The gap between what the top-line number says and what is happening underneath has grown wide enough to notice.
When nearly a quarter of the 500 companies are moving opposite to the market itself, that divergence is a big deal. It means the index's gains increasingly come from a shrinking group of winners while a growing group of laggards drags in the other direction.
The record short interest adds another wrinkle. High levels of bearish betting can actually push prices higher through what traders call a short squeeze — when rising prices force pessimists to buy back shares, driving prices up further. But it also means a significant group of investors believes conditions will deteriorate in ways the index does not yet show.
The Evercore ISI data came out August 17, the most recent of the three sources. The short interest figure reflects July positioning, and the record-close count runs through August 4. Taken together, they describe a market where the headline number and what is happening beneath it have pulled apart.
The real question is not whether the index will keep setting records. It is whether the gains, and the bets surrounding them, can hold up. When 121 stocks move against a market at all-time highs and short interest sits at a record, the top-line number is telling a much simpler story than what is actually going on inside.
