• September flash PMI shows manufacturing at 57.0 vs. 53.6 forecast, services at 58.7 vs. 56.0 expected, and composite at 58.4, up from 56.0 in August.
  • The broad-based expansion suggests the economy entered late Q3 with strong momentum, potentially complicating the Federal Reserve's efforts to curb inflation.
  • Markets may see support for equities, but bonds could face pressure as rate-cut expectations diminish.

Surprising Strength in U.S. Business Activity

The U.S. private sector kicked into higher gear in September, with flash purchasing managers' index readings far exceeding analyst expectations, according to data released on Tuesday. The S&P Global flash manufacturing PMI jumped to 57.0, well above the 53.6 forecast, while the services PMI soared to 58.7, trouncing expectations of 56.0. The composite index, which blends both sectors, climbed to 58.4 from 56.0 in August. All readings are comfortably above the 50 threshold that separates expansion from contraction, signaling robust growth across factories and service providers.

The surprise is particularly notable because both major sectors outperformed by a wide margin, suggesting the economy is not slowing as much as some had feared. "The U.S. private sector is firing on all cylinders," said one economist who reviewed the data, speaking on condition of anonymity. "This is a much stronger picture than anyone anticipated." The flash PMI surveys are based on early monthly responses from purchasing managers, offering a timely snapshot of output, orders, hiring, and pricing trends before official data are released.

Implications for Fed Policy and Markets

The strong reading comes just days after the Federal Reserve raised its benchmark interest rate by 25 basis points to a range of 3.75%–4.00%, its first hike since 2023. Policymakers have repeatedly stressed their commitment to bringing inflation down, and the latest PMI data may reinforce the case for keeping rates restrictive for longer. "This weakens the argument for near-term rate cuts," said a fixed-income strategist at a major Wall Street bank. "The Fed will likely see this as confirmation that the economy can handle higher rates."

Equities could benefit from the growth signal, particularly in cyclical sectors like industrials, business services, and consumer discretionary. However, bond investors may push yields higher on expectations of prolonged tightening. The dollar also stands to gain if U.S. growth outpaces other major economies. "The data is unequivocally positive for earnings, but the inflation implications are a double-edged sword," noted one portfolio manager.

What to Watch

Investors will scrutinize the underlying details of the PMI report—new orders, employment, input costs, and selling prices—to gauge whether the strength is sustainable. The final September PMI, due next week, could revise the flash estimates. Also on the radar: ISM surveys, the September jobs report, and upcoming CPI and PCE inflation data. With the Fed signaling additional tightening may be needed, all eyes will be on whether this burst of activity translates into persistent price pressures.

Correction: An earlier version of this article misstated the forecast for the services PMI. It was 56.0, not 55.0.