Friday I wrote that the market could survive 5%+ yields as long as the deals held. Over the weekend, one of them broke. Trump rejected Iran's proposal to reopen the Strait of Hormuz. Oil surged past $96, yields climbed to 5.24%, and the S&P gave back most of Friday's gain in a single session.
The Close
Down across the board. The S&P fell about 0.6% to close near 7,699. The Nasdaq dropped 0.9%. The Dow lost more than 300 points. Eight of 11 sectors finished in the red.
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| WTI Crude | $94.96 | +2.8% | ||
| 10-Yr Yield | 5.24% | +2 bps | ||
| S&P 500 | 7,699 | −0.6% | ||
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| Energy |
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+1.0% | ||
| Consumer Staples |
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+0.3% | ||
| Health Care |
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+0.2% | ||
| Financials |
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−0.3% | ||
| Industrials |
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−0.4% | ||
| Materials |
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−0.5% | ||
| Real Estate |
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−0.7% | ||
| Technology |
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−0.8% | ||
| Utilities |
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−1.0% | ||
| Consumer Disc |
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−1.2% | ||
| Comm Services |
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−1.5% | ||
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The trigger was clear. Over the weekend, Trump rejected Tehran's proposal to end the conflict and reopen the Strait of Hormuz. He told Axios on Sunday that while he expects talks to resume this week, the terms Iran offered were not acceptable. The market had spent Thursday and Friday building a diplomacy premium into prices. Monday morning it came out.
WTI crude topped $96 during the session before settling near $95. Brent rose 2.5% to $106.89. When crude is back above $95 and Brent is above $106, the inflation story is alive.
The 10-year Treasury yield climbed to 5.24%, its highest in nearly two decades. The 30-year hit 5.56%, the highest since 2004. Mohamed El-Erian said on CNBC that he's willing to bet yields stay around 5% and "we're not going back" to four or four-and-a-half percent.
Only three sectors finished green: energy, consumer staples, and health care. The classic defensive trio. When money rotates into canned goods, hospitals, and oil companies, the market is telling you it's nervous about what comes next.
The biggest single-stock story was MongoDB, down 18.5% after its CEO Chirantan "CJ" Desai left immediately to become Meta's chief enterprise platform officer. Meta itself fell 4.4% on the day — the enterprise AI launch that poached MongoDB's CEO also spooked investors about how much Meta plans to spend building it. ServiceNow dropped 3.2% on the same fears.
Goldman Sachs flagged a number worth watching. The S&P 500's forward price-to-earnings ratio — the price investors pay per dollar of expected future earnings — has dropped to 19 times from 22 times. The market isn't cheap, but it's getting cheaper. And yields are the reason.
What The Market Is Pricing In
The S&P fell half a percent on Monday and gave back most of Friday's gain. What changed? One headline. Trump walked away from the Iran deal.
Friday's thesis was simple: diplomacy and AI can offset 5%+ yields. The market gained on the week because falling oil and trade truce headlines gave stocks a floor every time bonds pushed them lower. That thesis survived exactly one weekend.
Monday showed you what happens when the diplomacy leg breaks. Oil jumps. Yields keep climbing. Defensive sectors — energy, staples, health care — catch a bid, and everything else sells. Consumer cyclicals and communication services led the decline.
The S&P 500's forward P/E has dropped from 22 times to 19 times since the Fed hiked on September 16. That's the market adjusting to a world where the risk-free rate is above 5% and climbing. At 19 times, the S&P is back to its 10-year average. But averages don't hold when yields are at 19-year highs.
Where does the floor come from now? Trump told Axios that talks will resume this week, which is why the selloff was half a percent and not two. The market is still giving credit for a deal — just less of it.
There's also the calendar. Core PCE on Wednesday will tell you whether the oil-driven inflation is showing up in the Fed's preferred gauge. Micron reports after the bell Wednesday and is the first big test of whether AI capital spending is still accelerating.
The last time Trump pulled the rug on an Iran deal was May 2018, when he walked away from the JCPOA. Oil jumped. But the S&P didn't roll over for another six months — it peaked in September 2018 before the December crash. The runway between deal collapse and market reckoning was longer then. With yields already at 5.24% and the Fed actively hiking, the runway this time is shorter.
What's Next
Three things I'm watching this week:
01 — Iran Ceasefire Framework
Trump said Sunday he expects U.S. negotiators to engage in more talks with Iran this week. Axios reported that the U.S., Iran, and regional mediators are discussing terms for a potential 45-day ceasefire that could lead to a permanent end to the conflict. If a framework emerges, oil drops and the rally resumes. If talks stall again, $96 WTI becomes $100 and the yield pressure intensifies.
02 — Micron Earnings (Wednesday, September 30, after close)
The first major AI earnings report of the season. Micron's data center revenue has been the cleanest read on AI demand for the last four quarters. If orders are still accelerating, the AI thesis holds and tech gets a bid even at 5%+ yields. If there's any sign of a slowdown, the one pillar holding up the Nasdaq comes into question.
03 — Q3 Ends Wednesday
The third quarter closes in two days. Money managers are adjusting portfolios — selling the week's losers, buying the laggards, cleaning up their books. After two weeks where yields moved 30 basis points and some sectors swung 3–5%, the forced buying and selling from quarter-end rebalancing could amplify whatever direction the market picks tomorrow and Wednesday.
Friday proved the market can survive 5%+ yields with a deal in hand. Monday proved it can't survive them without one.
That's it for today. See you tomorrow after the close.
