The S&P 500 rose to the highest level since March 2022 early in the third quarter but rising global bond yields, fears of a rebound in inflation and concerns about a future economic slowdown weighed on the major indices in August and September and the S&P 500 finished the third quarter with a modest loss.

The S&P 500 started the third quarter largely the same way it ended the second quarter – with gains. Stocks rose broadly in July thanks primarily to “Goldilocks” economic data, meaning the data showed solid economic growth but not to the extent that would have implied the Federal Reserve needed to hike rates further than investors expected. That solid economic data combined with a decline in inflation metrics to further boost stock prices, as investors embraced reduced near-term recession risks and steadily declining inflation. The Federal Reserve, meanwhile, increased interest rates in late July but also signaled that could be the last rate hike of the cycle. That tone and commentary further fueled optimism that one of the most aggressive rate hike cycles in history was soon coming to an end. Finally, Q2 earnings season was better-than-feared with mostly favorable corporate guidance which supported expectations for strong earnings growth into 2024. The S&P 500 rose to the highest level since March 2022 and the index finished with a strong monthly gain of more than 3%.

The market dynamic changed on the first day of August, however, when Fitch Ratings, one of the larger U.S. credit rating agencies, downgraded U.S. sovereign debt. Fitch cited long-term risks of the current U.S. fiscal trajectory as the main reason for the downgrade, but while that lacked any near-term specific justification for the downgrade, the action itself put immediate downward pressure on U.S. Treasuries, sending their yields meaningfully higher. The Fitch downgrade kickstarted a rise in Treasury yields that lasted the entire month, as the downgrade combined with a rebound in anecdotal inflation indicators and a large increase in Treasury sales stemming from the debt ceiling drama pushed yields sharply higher. The 10-year Treasury yield rose from 4.05% on August 1st to a high of 4.34% on August 21st, the highest level since mid-2007. That rapid rise in yields weighed on stock prices throughout August and the S&P 500 posted its first negative monthly return since February, as higher rates pressured equity valuations and raised concerns about a future economic slowdown. The S&P 500 finished August down 1.59%.

The August volatility subsided in early September, however, as solid economic data and a pause in the rise in Treasury yields allowed the S&P 500 to stabilize through the first half of the month. But volatility returned following the September Fed decision as the FOMC delivered markets a “hawkish” surprise, despite not increasing interest rates. Specifically, the majority of Fed members reiterated that they anticipated the need for an additional rate hike before the end of the year and forecasted only two rate cuts for all of 2024, down from four rate cuts forecasted at the June meeting. Then, late in the month, two additional developments weighed further on both stocks and bonds. First, the United Auto Workers labor union began a general strike, a move that would disrupt automobile production and temporarily weigh on economic growth. Second, the U.S. careened towards another government shutdown as Republicans and Democrats failed to agree on a “Continuing Resolution” to fund the government. The shutdown was avoided at the last minute, but the funding extension only lasts until November 17th meaning there will likely be another budget battle in the coming months. The S&P 500 declined towards the end of the month to hit a fresh three-month low, ending September down modestly.

In sum, volatility returned to markets during the third quarter, as rising bond yields pressured stock valuations, some inflation indicators pointed to a bounce back in inflation and the Fed reiterated a “higher for longer” interest rate outlook.