The August U.S. CPI report has added fresh fuel to an already tense atmosphere surrounding the Federal Reserve's September policy meeting. While headline inflation data met expectations, core CPI accelerated on a monthly basis and came in above forecasts. Combined with robust PPI and employment figures, market bets on a 25-basis-point rate hike next week have rapidly intensified.

According to the CME FedWatch tool, the probability of a September hike stood at around 70% before the CPI release; after the data was published, this probability surged toward 90%. If the Fed does act next week, it would mark the first rate increase in three years. What's particularly noteworthy, however, is the market's reaction: Treasury yields moved higher, yet equity index futures did not fall as intuition might suggest. All three major U.S. stock indices actually rose more than 1%. Behind this lies a market that appears to be pricing in more than just CPI itself—it's re-pricing the complex interplay of inflation, interest rates, oil prices, geopolitical risks, and tech earnings.

Core CPI Runs Hot: Gasoline, Shelter, and Transport Costs All Rise

The Labor Department reported Friday that CPI rose 0.4% month-over-month in August, following a modest 0.1% increase in July; year-over-year, CPI advanced 3.4%, unchanged from July, both in line with consensus expectations. Excluding food and energy, core CPI climbed 0.3% month-over-month, exceeding the 0.2% forecast and accelerating from July's 0.2% gain; core CPI rose 2.4% on an annual basis, a slight pullback from July's 2.5%.

This report indicates that inflation is making little progress toward the Fed's 2% target, under pressure from the Iran conflict, tariffs, and ongoing demand stemming from data center construction. Looking at the components, gasoline prices jumped 3.9%, accounting for more than one-third of the index's increase. The energy index overall rose 2.1% amid escalating Middle East tensions, up 16.3% year-over-year. Food prices edged up 0.1%, with the cost of food at home flat, while the food index gained 2.7% annually.

Another crucial factor was shelter costs rising 0.3%, reversing the slowdown seen in the previous two months. Transportation services prices increased 0.5%. Used car and truck prices gained 0.4%, and new vehicle prices rose 0.3%, appearing to be part of a broad-based uptick. Notably, the Fed closely tracks the Personal Consumption Expenditures (PCE) price index rather than CPI. Despite core CPI easing slightly to 2.4% year-over-year, core PCE remained elevated at 3.3% in July, far above the Fed's 2% objective.

PPI and Jobs Data Align, Lifting Core PCE Estimates

Thursday's PPI data also demonstrated stubborn inflationary pressures. August PPI rose, with several key components—which feed into the PCE inflation calculation—showing strength. Combined with last week's strong August jobs report, this provided further support for rate hike expectations next week.

Following the PPI release, economists' estimates for August core PCE ranged from 0.15% to 0.28% month-over-month, compared to July's 0.2% increase; the year-over-year estimate range was 3.2% to 3.3%, versus July's 3.3%. Furthermore, the August PCE report will incorporate methodological adjustments, which some economists believe could shave a few basis points off the core inflation rate.

Additionally, some economists argue that import tariffs—particularly the recently imposed duties on Canada—are keeping price pressures alive. Discontent over high gasoline and food costs has notably dented President Trump's approval ratings and could cost Republicans control of Congress in the November midterm elections.

For now, the Fed remains divided on its next move. Officials have held rates steady at the previous five meetings, though three dissented at the July meeting in favor of a 25-basis-point hike. Fed Chair Warsh has been reluctant to tip his hand, but he stated last month that if the Fed cannot be "confident that underlying inflation is moving clearly and sufficiently quickly toward target," then there is "more work to do."

Fed Governor Waller indicated last week at an event that he would lean toward holding rates steady if data confirmed cooling inflationary pressures. His remarks briefly lowered hike probabilities. However, after the latest CPI figures, futures markets suggest investors see next week's hike as almost certain, with another increase highly likely before year-end.

Meanwhile, Trump continues to pressure the Fed to cut rates, posting on social media last week: "Lower interest rates, or I will stop trading with countries that have a trade deficit with us." Economists attribute the surge in long-term Treasury yields to such political intimidation, with some expecting the Fed to choose a hawkish stance next Wednesday to reaffirm its independence. Kathy Bostjancic, chief economist at Nationwide, commented: "Chair Warsh and others have signaled that rates can only stay put if disinflation continues, and today's August report does not provide those conditions. Additionally, renewed gains in crude oil, gasoline, and diesel prices heighten concerns that energy cost increases could feed through to other goods and services, as well as inflation expectations." The firm now projects a 25-basis-point hike next week.

Why Are Stocks Rising Despite the CPI Miss? The Market Is Trading on Three Interconnected Themes

Even as Fed rate hike expectations escalated and Treasury yields continued to climb following the CPI release, U.S. equity index futures expanded their gains. On the surface, "hotter inflation and higher hike odds" should be bearish for stocks. But the market is currently trading a far more nuanced logic.

First, this CPI report is not a full-blown blowout. Headline CPI met expectations on both monthly and annual bases, and core CPI also matched forecasts year-over-year; the only clear miss was the monthly core figure. Consequently, the market did not receive a "runaway inflation" signal that would fundamentally alter the monetary policy trajectory. In other words, while rising hike expectations are a negative factor, much of this negativity had already been priced in by the market in advance. Stephen Juneau, senior economist at Bank of America, commented after the CPI release: "This report doesn't really make us more worried about the inflation outlook," even though it will prompt the Fed to hike next week.

Second, the pullback in oil prices serves as another key driver for equities. Over the past few days, oil breaking above $100 per barrel and continuing to surge weighed on market risk appetite. Brent crude futures jumped over 6% on Thursday, raising concerns that energy costs would feed further into inflation and corporate expenses, potentially forcing the Fed to maintain tighter policy for longer. But on Friday, oil prices retreated sharply. Brent had approached $110 per barrel before falling on reports that Middle Eastern nations were attempting to broker a temporary agreement with Iran regarding shipping arrangements in the Strait of Hormuz. In recent trading, both Brent and WTI were down more than 3%.

This decline is a significant positive for stocks. The market's real fear isn't just "whether the Fed hikes 25 basis points next week" but rather the chain: escalating Middle East conflict → rising oil prices → resurgent inflation → forced consecutive Fed hikes → higher Treasury yields → compressed equity valuations. Friday's substantial drop in oil from highs suggests a degree of easing in this risk chain. The market is effectively witnessing a hedge: a hot CPI boosts hike expectations, but falling oil prices reduce the risk of further inflation deterioration going forward.

Third, tech stocks have an independent catalyst. Oracle's (ORCL.US) strong quarterly results and forward guidance drove its shares sharply higher pre-market, providing a lift to Nasdaq futures. Market data shows Nasdaq 100 futures gained slightly more than S&P 500 futures and Dow futures. This indicates the current rally is not purely about interest rates. For tech companies, AI investment, cloud computing, and enterprise software demand remain independent earnings drivers. As long as earnings expectations are robust enough, they can offset some of the valuation pressure from rising rates.

The market had already endured several days of losses due to rising oil, higher PPI, and climbing Treasury yields. Thursday's data showed August PPI up 5.4% year-over-year alongside an oil surge of over 6%, pushing yields higher and marking the fourth consecutive session of declines for major indices. In other words, before the CPI release, the market had already priced in "hot inflation and a more hawkish Fed." Therefore, when the final CPI showed only a modest upside surprise in monthly core inflation, rather than a comprehensive beat across all measures, there was no need for another large-scale sell-off.

From a trading perspective, this is closer to "the worst-case scenario didn't worsen." It could even be interpreted as the market shifting focus from "will the Fed hike?" to "how many more hikes after this one?" If a September hike is nearly certain, the real questions become whether October and December will see further increases, and what the rate path looks like into 2027.

The Real Risk Remains a "Oil + Inflation" Double Shock

However, the rally in equity futures does not mean inflation risk has dissipated. In fact, the biggest variable remains oil prices. In the August CPI report, gasoline prices resumed their climb after two months of declines; meanwhile, Thursday's PPI data showed energy price increases transmitting to the production side. If oil breaks back above $110 or pushes even higher, today's optimistic interpretation of the CPI could quickly reverse.

Particularly concerning is if the oil rally is not a short-term shock but persists due to supply disruption in the Strait of Hormuz. In that scenario, it could simultaneously push up headline inflation, squeeze consumers' real incomes, and force the Fed to maintain higher rates. This would create the most adverse combination for stocks: elevated oil prices + above-target inflation + continued Fed hikes + rising Treasury yields.

Conversely, if Middle East tensions show signs of easing and oil continues to retreat from above $100, then even a 25-basis-point hike in September could be viewed as a "fully priced-in" move rather than the start of a new tightening cycle. The real meaning of today's futures rally is not that the market views this CPI favorably, but rather that while the report leans hawkish, it wasn't bad enough to break the existing trading framework; concurrently, falling oil prices and easing geopolitical risks provide fresh breathing room for risk assets.

Going forward, the market's focus will shift beyond just September's decision to whether oil can sustain its decline and whether the Fed will continue hiking afterward. These two variables will likely determine whether this rebound is merely a technical recovery from oversold conditions or the beginning of a renewed uptrend.