Diplomacy optimism drove markets higher early this week, then reversed hard as oil rallied back above 103 dollars.

The pattern is becoming familiar: progress on Iran talks eases oil, and any wobble sends it right back up.

Technology led the advance through Monday and Tuesday.

The S&P 500 rose 1.5 percent Monday, its best day since early August, as Meta jumped 11 percent on early success signs for its AI agent.

Chipmakers extended the move Tuesday. The Nasdaq 100 hit a record, its sixth straight gain for semiconductors, with AMD topping 1 trillion dollars in value.

• Trump said he would probably meet Iran's president at the UN
• US and Iranian officials held a very productive meeting in New York
• Brent fell from 100 dollars to 99 as hopes built

Trump also said the conflict would end shortly after the midterms, and a China summit with Xi added to the optimistic tone.

That momentum reversed on Wednesday in one session.

Brent jumped to 103 dollars after Iran's president said the country will not allow free navigation through Hormuz while sanctions and a blockade remain in place.

That single line undercut days of diplomatic optimism. Equities and bonds fell together as inflation bets firmed again.

A weak Treasury auction compounded the oil driven selloff.

A 70 billion dollar five year note auction came in weak, pushing yields across most maturities to nearly two decade highs.

The dollar advanced against every major currency. US business activity data showing its fastest expansion since 2021 added further fuel to the inflation case.

The Fed already raised rates 25 basis points last week. Fed Governor Michael Barr said further tightening will likely be needed to hit the 2 percent target, and money markets now fully price two more hikes over the next three decisions.

Separately, the Trump administration is working with refiners to voluntarily limit diesel exports rather than impose an outright ban, Energy Secretary Chris Wright said.

Geopolitics → Oil → Inflation → Federal Reserve → Equity leadership

• Diplomacy is driving oil in both directions within a single week
• Iran has drawn a hard line on Hormuz navigation despite talks
• Bond yields sit near two decade highs after a weak auction
• The Fed is signaling two more hikes are already priced in
• Strong US business activity data is reinforcing the inflation case

Every diplomatic gain this week has been undone by a single Iranian statement. The market has not learned to trust the trend yet.

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