S&P 500 dips, Nasdaq higher after data shows moderate inflation rise

September 30, 2026 5:49 AM EDT

Traders work on the floor at the New York Stock Exchange (NYSE) in New York City, U.S., September 29, 2026. REUTERS/Jeenah Moon

By Chuck Mikolajczak and Shashwat Chauhan

NEW YORK, Sept 30 (Reuters) - Nasdaq climbed ‌on Wednesday and the S&P ​500 dipped, but both ​indexes notched their second straight quarterly gains, as a softer-than-anticipated inflation reading cooled expectations that Federal Reserve policymakers would hike rates in October.

The US Commerce Department reported the Personal Consumption Expenditures Price Index (PCE) increased 3.4% on an annual basis in August, below the 3.7% estimate of economists polled by Reuters.

Separately, the final reading of ‌second-quarter GDP data was revised higher to a 2.2% annualized rate, thanks to solid consumer spending and investments helping to fuel the buildout of ⁠AI infrastructure.

The rising prices of crude oil from the US-Iran war and sky-high diesel fuel costs have stoked inflation worries and pushed US Treasury yields higher. Fed officials have indicated more rate hikes might be needed if price pressures fail ‌to moderate after the central bank raised interest rates ‌by 25 basis points this month.

Stocks lost ground heading into the closing bell, however, as the 2-year US Treasury note yield, which typically moves in step with Fed interest-rate expectations, turned slightly higher on the day. Longer-dated yields kept climbing on expectations for solid economic growth.

Market expectations for a rate hike of at least 25 basis points at the Fed's ​October meeting slumped to about 37%, according to CME's FedWatch Tool, from roughly 51% in the prior session and nearly 71% a week ago.

Analysts also noted that recent methodology changes in calculating PCE by the Bureau of Economic Analysis contributed to a lower reading.

"What the market is focused on is, is the economy continuing to grow and can it manage those higher ⁠interest rates? And I would say so far, the market has looked kind of like history that when the economy is growing, when profits are strong, when there's a secular theme, it will look past higher interest rates," said Anthony Saglimbene, chief market ​strategist at Ameriprise Financial in Troy, Michigan.

"However... if these higher rates stay at these elevated levels for longer, it's likely to start doing potentially more damage to the bond side of the portfolio, it could limit credit or available credit. And if investors start to feel those ​conditions could weigh on economic growth or weigh on corporate profitability over the next quarter or two, then ‌I think you would see a very swift negative reaction in the market."

S&P, NASDAQ NOTCH QUARTERLY GAINS

The Dow Jones Industrial Average fell 443.87 points, or 0.86%, to 50,906.05, the S&P 500 lost 19.30 points, or 0.25%, to 7,651.54 and the Nasdaq Composite gained 63.52 points, or 0.24%, to 26,861.06. The ⁠S&P had risen as much as 0.7% while the Nasdaq had climbed as much as 1.2% on the session.

For the month, the S&P 500 fell 0.45%, the Nasdaq rose 1.86%, and the Dow fell 4.29%. The Dow snapped a five-month streak of gains while the S&P fell for the third month in four. The Nasdaq gained for a second straight month.

Both the S&P 500 and Nasdaq recorded their second straight quarterly advances and ⁠fifth in the past six. The Dow saw a quarterly decline for the second time in three.

Most megacap and growth stocks ticked higher, with Microsoft, Apple and Nvidia each rising ato lifting the S&P 500 tech index ​0.6% as the best-performing sector on the day. However, nine of the 11 major S&P sectors ended the day lower.

PRIVATE PAYROLLS RISE IN SEPTEMBER

A reading on the labor market showed private employment rose by 90,000 jobs this month after a downwardly revised 36,000 in August, the ADP National Employment Report showed. The data was the latest in a string of reports on the job market this week that will culminate in Friday's ‌key government payrolls report.

Without addressing the softer-than-expected inflation data, Fed Governor Lisa Cook said she is committed to bringing inflation down without harming the labor market as price pressures have been too high for too long.

Among other movers, Hewlett Packard Enterprise climbed 3.9% after the AI server maker ‌raised its long-term revenue growth forecast for its networking business and announced a $1.2 billion deal with Vultr.

Moderna slumped 5.3% after brokerage Citigroup downgraded its rating on the biotech company to "sell" from "neutral."

Declining issues outnumbered advancers by a 1.66-to-1 ⁠ratio on the NYSE and by a 1.51-to-1 ratio on the Nasdaq.

The ‌S&P 500 posted 11 new 52-week highs and 24 new ​lows while the Nasdaq Composite recorded 54 new highs and 212 new lows.

Volume on US exchanges was 18.13 billion shares, compared with the 17.06 billion average for the full session over the last 20 trading days.

(Reporting by Chuck Mikolajczak; additional reporting by Shashwat Chauhan and Tharuniyaa Lakshmi in Bengaluru; Editing by Devika ‌Syamnath and David Gregorio)



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