S&P 500 Falls 0.57% at Open as September CPI Prints 3.7% Against a 3.6% Estimate

US equities opened lower on Wednesday after a September inflation report showed consumer prices rising faster than forecast, sending the S&P 500 down 44.61 points, or 0.57%, to 7,760.84 and the NASDAQ 100 down 303.48 points, or 0.99%, to 30,266 as of 10:00 AM New York time.

What Happened

September consumer price data released at 12:30 UTC showed headline inflation at 3.7% year-on-year against a 3.6% estimate, up from 3.4% in August. On a month-on-month basis, the headline CPI rose 0.6%, matching the 0.6% estimate, and compared with 0.4% in the prior month. The seasonally adjusted CPI index level came in at 336.3, above the 335.8 estimate, while the unadjusted index stood at 336.94, above the 336.65 estimate.

Core inflation, which strips out food and energy, rose 2.6% year-on-year against a 2.5% estimate, accelerating from 2.4% in August. On a monthly basis, core CPI printed at 0.3%, above the 0.2% estimate, and matching the prior month's reading of 0.3%.

Earnings: Financials Lead a Mixed Morning

Several large companies reported results before the opening bell, adding to the day's market narrative. Morgan Stanley delivered EPS of 3.03 USD against an estimate of 2.93 USD, with revenue of 20.34 billion USD against an estimate of 19.93 billion USD. BlackRock posted EPS of 15.93 USD against an estimate of 14.32 USD and revenue of 7.75 billion USD against an estimate of 7.42 billion USD.

Bank of America reported EPS of 1.08 USD against an estimate of 1.10 USD, with revenue of 30 billion USD against an estimate of 30.58 billion USD. Fastenal reported EPS of 0.35 USD against an estimate of 0.34 USD and revenue of 2.46 billion USD against an estimate of 2.44 billion USD. ASML Holding posted EPS of 14.65 USD against an estimate of 12.17 USD, though its revenue of 13.05 billion USD came in below the 13.14 billion USD estimate.

The earnings picture was uneven. Profit figures from Morgan Stanley, BlackRock, Fastenal and ASML came in above their respective EPS estimates, while Bank of America's EPS of 1.08 USD fell short of the 1.10 USD estimate and its revenue of 30 billion USD trailed the 30.58 billion USD estimate. ASML's revenue of 13.05 billion USD fell short of the 13.14 billion USD estimate, adding a note of caution on the technology equipment side. The mixed results were not sufficient to offset the inflation-driven pressure on equities at the open.

Why It Matters

The September CPI data arrives at a sensitive moment for markets. Headline inflation accelerated to 3.7% year-on-year from 3.4% in August, and core inflation moved to 2.6% from 2.4% over the same period. The headline reading of 3.7% against a 3.6% estimate and the core reading of 2.6% against a 2.5% estimate together reduce the likelihood that the Federal Reserve will move quickly to cut rates, keeping pressure on rate-sensitive sectors and growth-oriented equities.

The NASDAQ 100's steeper decline of 0.99% relative to the S&P 500's 0.57% drop reflects this dynamic, as technology and growth stocks tend to be more sensitive to the interest rate outlook. The S&P 500's previous close was 7,805.45, and the NASDAQ 100's previous close was 30,569.48, giving context to the scale of the morning's moves. The CBOE Volatility Index stands at 15.81, up 3.54% from its previous close of 15.27, signaling a pickup in near-term uncertainty among options market participants consistent with the cautious tone seen across equity markets at the open.

For the financial sector specifically, the earnings results from Bank of America and Morgan Stanley offer a window into how large institutions are navigating an environment of elevated borrowing costs. Morgan Stanley's revenue of 20.34 billion USD against a 19.93 billion USD estimate and BlackRock's revenue of 7.75 billion USD against a 7.42 billion USD estimate suggest that asset management and investment banking activity held up well in the third quarter. Bank of America's revenue of 30 billion USD against a 30.58 billion USD estimate points to more pressure on the lending side, where higher rates can compress net interest margins as deposit costs rise alongside loan yields.

ASML's results are notable beyond the earnings season context. The Dutch semiconductor equipment maker reported EPS of 14.65 USD against an estimate of 12.17 USD, a substantial profit outperformance, yet its revenue of 13.05 billion USD fell short of the 13.14 billion USD estimate. For a company whose order book is closely watched as a leading indicator of global chip investment cycles, a revenue shortfall — even alongside strong profitability — draws attention to the pace of equipment spending by chipmakers. That dynamic adds a layer of complexity to the technology sector's reaction to today's data.

What to Watch Next

The earnings season continues to accelerate through October, with results from major financial institutions and technology companies providing a read on corporate health against a backdrop of elevated inflation and higher borrowing costs. The September CPI readings — headline at 3.7% against a 3.6% estimate and core at 2.6% against a 2.5% estimate — will feed directly into market expectations ahead of the Federal Reserve's next policy decision.

Any Federal Reserve commentary in the wake of today's CPI print will be closely followed for signals on the pace of future policy adjustments. The month-on-month core reading of 0.3% against a 0.2% estimate, and the acceleration in the year-on-year headline from 3.4% in August to 3.7% in September, will be key reference points in that discussion. Subsequent inflation and labor market releases on the data calendar will be the next key inputs for assessing whether the September readings represent a trend or a one-month deviation from the prior path.