Last week the market had the best week since the Fed hiked. The S&P 500 added 1.2%, the Nasdaq gained 2%, and Meta ran 13% on its Muse AI agent reaching the top of the App Store faster than ChatGPT ever did. Oil fell on Middle East de-escalation and Treasury yields retreated from the near-5% close of triple witching Friday. This week the data gets heavy: PCE inflation on Wednesday, the September jobs report Friday, and five Fed speakers Tuesday including Williams and Waller speaking the day before the Fed's preferred inflation gauge drops. Here is what to watch.
Market News, Week of September 28, 2026
The story of last week was Meta Platforms. The company launched Muse, a personal AI agent, on September 8. By the week of September 21, Muse had reached number one on the Apple App Store, surpassing ChatGPT's adoption pace at the equivalent point in its history. Meta stock climbed approximately 13% last week alone and is up roughly 36% through September 24. The stock reached $777.59, pushing Meta's market capitalization to approximately $1.98 trillion. Analysts began publishing revenue projections for Muse in the $50 billion annual range, a figure that would represent a business larger than most Fortune 500 companies built inside a product that launched three weeks ago. Muse operates as an autonomous browser-driving agent, not a conversational chatbot: it manages email and calendars, books travel, executes purchases via Stripe, and performs tasks on behalf of the user rather than just answering questions. That is the distinction the market is pricing. If Muse is a product, it generates advertising revenue. If it is a platform for agentic commerce, it generates transaction fees. Analysts projecting $50 billion are pricing the platform scenario.
The macro backdrop that allowed Meta to run was oil and yields. Oil prices fell last week on signals of progress toward a Middle East ceasefire, reducing the energy inflation component that the Fed cited in its September 16 rate hike. The 10-year Treasury yield, which closed the prior week at 4.996%, retreated enough to provide a tailwind for growth and AI-adjacent names. The S&P 500 sits about 2% below its 2026 record high. Monday September 21 was the strongest single day of the week, with the Nasdaq up 2.3%, S&P up 1.5%, and Dow up 0.7%, as easing geopolitical tensions and falling yields combined for a risk-on open.
Wednesday September 30 is the quarter end. September 30 closes Q3 2026. Institutional portfolio rebalancing, window dressing, and mutual fund fiscal year-end flows all land on the same day as the PCE inflation print. That is an unusual combination. FactSet estimates S&P 500 earnings grew 28.9% in Q3 2026, which would mark the third consecutive quarter above 25% growth. The official Q3 earnings season does not begin in earnest until the second week of October, but the fundamental backdrop heading into it is strong.
Economic Calendar, Week of September 28, 2026
Monday, September 28: No major scheduled data releases. Watch oil prices at the open for any weekend Middle East developments. Quarter-end positioning begins today ahead of the September 30 close.
Tuesday, September 29: JOLTS Job Openings for August (10:00am ET, impact: High). The job openings level is the labor market's leading indicator: it signals future hiring demand before it shows up in payrolls. After the Fed hiked citing labor market strength, a significant decline in August openings would complicate the case for a November follow-up hike. Conference Board Consumer Confidence for September (10:00am ET, impact: High). Five Federal Reserve officials speak, including New York Fed President Williams and Fed Governor Waller. Both are influential in setting the consensus view. Their language Tuesday, the day before PCE drops, will telegraph the Fed's initial read on what the inflation data means for November.
Wednesday, September 30: PCE Price Index for August (8:30am ET, impact: Very High). This is the week's most important release and the Fed's preferred inflation gauge. July PCE came in at 3.7% year-over-year headline and 3.3% core (excluding food and energy). The August read will determine whether the September rate hike is working or whether inflation is reaccelerating. An August core PCE above 3.3% confirms the Fed's inflation concern and makes November a live meeting. A reading below 3.0% gives the Fed room to pause. This data hits the tape at the same time as quarter-end rebalancing flows, which can amplify the initial reaction. Also today: ADP private sector employment report for September (8:15am ET); final Q2 2026 GDP revision; Chicago PMI for September. Q3 2026 closes at 4:00pm.
Thursday, October 1: ISM Manufacturing PMI for September (10:00am ET, impact: High). Q4 2026 begins. The August ISM Manufacturing read sets the baseline. A September reading above 50 confirms the expansion thesis that supported the Fed's hike. A reading below 50 in the same week as a weak jobs report creates the stagflation signal. Construction Spending for August (10:00am ET). EIA Weekly Crude Oil Stockpiles (10:30am ET).
Friday, October 2: September Jobs Report, nonfarm payrolls (8:30am ET, impact: Very High). This is the week's closing binary and the most important economic data point before the November FOMC meeting. Consensus estimate: approximately 90,000 nonfarm payrolls. Capital Economics projects 50,000, citing continued federal workforce reductions limiting any private sector rebound. The unemployment rate is expected to hold at 4.1%. A print at or below 90,000 with 4.1% unemployment, alongside a PCE above 3.3% on Wednesday, creates the stagflation read the Fed has least ability to respond to cleanly. A print above 150,000 with a steady unemployment rate keeps the soft-landing narrative intact and gives the Fed reason to consider a November hike.
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