A rare occurrence where equities and the dollar fall together

Key points:

• Over the past three months, the S&P 500 and the Dollar Index (DXY) have weakened simultaneously
• The Dollar Index (DXY), the S&P 500, and most sectors displayed lackluster returns and consistency
• A broad global index performed even worse than the world's most benchmarked index

When stocks and the dollar fall in tandem, it often reflects a repatriation trade

Over the past three months, the S&P 500 and the U.S. Dollar Index (DXY) have experienced notable declines, fueling a familiar round of narratives questioning the end of U.S. exceptionalism and speculating about the dollar's reserve currency status. Although the headlines lean dramatic, the underlying dynamics, while rare, appear more routine. 

We're likely witnessing a repatriation flow, a common feature during global equity market stress when investors seek the safety of their home country. This time, the trigger is a tariff tantrum, as rising trade tensions have injected uncertainty into global markets.

The S&P 500 and the Dollar Index (DXY) declined by -7% over three months, the first such instance after a high in the world's most benchmarked index.

This study serves more as a market observation than a direct trading signal, offering historical context to the current environment. 

Similar concurrent declines in stocks and the dollar suggest risk remains high

Given that fluctuations in the dollar often influence stock prices, especially for large-cap multinational companies, let's see how the dollar reacts after it and the S&P 500 dropped as they have over the last three months.

In the six months that followed, the dollar showed no consistent pattern, behaving much like a coin toss. However, a year later, it was higher in 75% of the cases.  

What about stocks?

The S&P 500 exhibited a modest rally during the first three months, but momentum faded, with the index advancing in just half of the instances between months four and six. In six of the eight historical parallels, the world's most benchmarked index went on to post a lower low. Only 1978 and 1998 coincided with a bottom.

Sector performance was mixed in the initial three months. A year later, however, technology outperformed all other groups, potentially due to its global reach and the tailwind of a weaker dollar. 

From a global standpoint, there wasn't much opportunity overseas when viewed through the lens of a broad index. The MSCI World Index underperformed the S&P 500, suggesting that the simultaneous decline in the S&P 500 and the dollar stemmed from a systemic issue. 

What the research tells us...

Over the past three months, the S&P 500 and the U.S. dollar have declined in unison, a rare and notable development given that the dollar typically strengthens during risk-off periods when equity markets retreat. A falling dollar alongside a falling stock market tends to occur during periods of uncertainty, often pointing to market stress or geopolitical tensions that trigger capital repatriation, not the dollar's demise. With six of the last eight instances resulting in a lower low for the S&P 500, maintaining a cautious stance and waiting for a more favorable entry point appears prudent.