While the broad S&P 500 has barely moved for months, confined to a narrow trading range, individual sectors have swung sharply and largely offset one another.
Now that most earnings reports are behind them, investors are focusing on macro dangers again, and there is no shortage: the conflict in Iran, a divided Federal Reserve, and inflation that remains sticky.
"The macro picture is deteriorating," Brent Kochuba, who founded the options platform SpotGamma, said. "Before the idea was that AI could grow our way out of our problems, but that is now coming a bit into question."
RBC Capital Markets' trading desk often describes the current high-dispersion, low-correlation market as resembling a duck gliding across a pond. "It's a duck sitting on the surface but paddling very hard beneath it," according to Matthew Davis, RBC's director of flow derivatives trading. "That dynamic has yielded very good results for institutions who have been exposed to the dispersion trade."
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Data is starting to show possible change. According to Cboe Global Markets Inc., an index tracking one-month dispersion expectations in large-cap stocks has fallen in six of the last seven sessions, after spiking earlier this month to a level not seen since 2020. Implied correlation for the S&P 500's top 50 names is heading for its third straight weekly increase, having touched an all-time low earlier this month. Also this week, a normalized three-month put-to-call skew gauge on the S&P 500 climbed to its highest point since April.
Taken together, those derivatives measures suggest that traders are positioning less for stock-specific surprises and more for an index-level event. Falling dispersion expectations and rising implied correlation are two sides of the same concern: a macro shock or a blowup in the AI trade would cause many stocks to move together, making index hedges more valuable than single-stock hedges.
In a client note this week, Goldman Sachs traders, among them Gail Hafif, said that as macro uncertainty lingers and momentum enthusiasm is being washed out, the probability of a correlation shock is drawing attention.
The VIX, Cboe's volatility gauge, remains comfortably below 20, a threshold often tied to growing market stress. Investors are increasing their demand for downside protection as August begins, a month that, like September, has historically produced some of the biggest swings in U.S. stocks.
A number of traders bracing for bigger macro moves compare the current moment with August 2024, when the Bank of Japan unexpectedly raised rates, a move that unraveled the yen carry trade and briefly sent the VIX above 65 while dragging the S&P 500 to a three-month low. That episode is a reminder of how quickly calm positioning can unwind when correlations snap back. Even with low current readings of implied correlation, a sharp shock can force a broad deleveraging.
Vuk Vukovic, CIO of Oraclum Capital, holds short-dated put options on the S&P 500, which would gain value should the index fall sharply. "You don't know if it's going to happen next month," he said by phone. "It can happen in two years, but you've got to be ready."
Jamie Sandells, who is a portfolio manager at Janus Henderson, has set up his portfolio to profit from rising correlation. "If we did get a big macro shakeout, or a big downtrend in AI, we could actually see that correlation pick up," Sandells said by phone. "Some sort of macro event, maybe a Fed shock, maybe an AI shock, could drive up index volatility quite significantly."
The SPDR S&P 500 ETF Trust, the State Street product, traded at 741.69, up 1.68%. For now, the duck is still paddling hard beneath the surface.
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