Oil Prices Plunge, Stocks Mixed as Iran Signals Openness to U.S. Diplomatic Deal

Crude oil prices tumbled on Monday after the presidents of the United States and Iran signaled openness to a diplomatic resolution of the eight-month conflict that has repeatedly jolted energy markets, according to CNBC. U.S. equities were mixed the same day, with the Dow Jones Industrial Average rising even as the Nasdaq and S&P 500 slipped, reflecting a rotation rather than a uniform risk-on move.

Oil's Sharp Reversal

West Texas Intermediate futures shed 7.4% to close at $96.46 a barrel, their biggest daily loss since July 27, while Brent crude lost 7.6% to settle at $104.77 a barrel, CNBC reported. The decline followed a run-up of more than 10% in October, when the market had priced in the risk of a major military escalation after the U.S. midterm elections, according to the same CNBC report.

What's Driving the Diplomatic Signals

President Trump told reporters Monday that Iran wants to "make a deal and that could happen," CNBC reported. Secretary of State Marco Rubio said over the weekend that Trump "hasn't made a decision" to attack Iran and that Washington would prefer to resolve the conflict "peacefully," according to CNBC's live markets coverage.

Iran's foreign minister, Abbas Araghchi, said an agreement with the U.S. is possible if Washington "demonstrates goodwill" and is "truly seeking a peaceful solution," according to Iran's IRNA news agency as cited by CNBC. Tehran's stated conditions include:

• Lifting U.S. sanctions
• Reducing the U.S. military presence in the region to previous levels
• Lifting the naval blockade on Iranian ports

Separately, Al Jazeera reported that Iran is trying to accelerate a ceasefire proposal that includes a swift reopening of the Strait of Hormuz and a return to talks over Iran's nuclear program, with Tehran's conditions also covering a guarantee of an end to strikes and a complete regional ceasefire, particularly in Lebanon. Al Jazeera, citing the state IRNA news agency, also reported that Iran's Supreme Leader Mojtaba Khamenei had reportedly granted the government “powers” to accelerate talks with the U.S. — even as CNBC reported that Khamenei separately called on Saturday for Tehran's armed forces to meet “any level or type of threat” with an “immediate, impactful, and geographically unrestricted response.”

A History of False Dawns

This is not the first time diplomacy has appeared to de-escalate the conflict. Al Jazeera reported that on June 15, 2026, Trump announced completion of a "deal" with Iran, authorizing the toll-free reopening of the Strait of Hormuz and the immediate removal of the U.S. naval blockade, with Iran's Supreme National Security Council later confirming the sides had finalized the wording of a memorandum of understanding. Even then, Al Jazeera reported that U.S. Secretary of Energy Chris Wright acknowledged it could take "many months" for energy supplies to normalize, and shipping executive SV Anchan predicted normal flows could take "over a year" to return given the lack of detail in the agreement.

The pattern repeated in October: Morningstar reported that oil climbed to a five-month high on fears the U.S. could strike Iran after the midterms, before diplomatic signals resurfaced in early November. CNBC noted that "the oil market has sold off during previous phases of the war on rumors of a possible settlement, only for the conflict to subsequently escalate and spike prices again" -- a dynamic that underscores why Monday's drop should be read cautiously rather than as confirmation that the conflict is over.

The Sticking Point: Uranium Enrichment

Even as talks appear to be gaining momentum, a core disagreement remains unresolved. According to the Arms Control Association, Vice President JD Vance said Iran needs to make a "meaningful" reduction in uranium enrichment to meet U.S. demands, a softer framing than Trump's earlier demand for a full freeze or abandonment of enrichment. Iran's atomic energy chief, Mohammad Eslami, rejected any retreat, saying on Oct. 7 that "enrichment is an integral part of the nuclear process, and we will not abandon it in any way," per the same report.

The Arms Control Association also reported that an Iranian official wrote in an Oct. 11 post on X that while the U.S. “has agreed to some of Iran's seven conditions,” the response was “INADEQUATE,” adding that “Iranian diplomacy has changed and there will be no return to the status quo ante.” On the military side, the same report cited CNN's Oct. 15 reporting that U.S. strike planning includes options to use the Massive Ordnance Air Blast bomb on Iranian nuclear sites and energy infrastructure, and noted Iranian officials' own escalation threats, including a warning from Gen. Mohammad Reza Naqdi that if Washington makes the wrong move Iran “will come for you with the father of bombs, and all your assets will be at risk,” and an Oct. 18 claim from Mohsen Rezaei that Iran's armed forces have prepared a plan “more devastating” than the 12-day war of June 2025.

Market Positioning and the Risk Premium

Not every analyst views Monday's selloff as evidence the geopolitical risk premium is gone. TD Securities analyst Ryan McKay told CNBC that "so long as there is no concrete conclusion to the war, and tanker and Houthi attacks remain prevalent, we do not anticipate a complete erosion of the risk premium via diplomacy headlines alone." That framing suggests traders are treating Monday's move as a repricing of near-term escalation odds rather than a resolution of the underlying supply risk.

Background context from JPMorgan's institutional research helps explain why the market can swing sharply on headlines without necessarily reflecting actual supply disruption: Iran produces roughly 5% of global oil, and the Strait of Hormuz is a passageway for roughly one-fifth of the world's oil supply, but JPMorgan noted that OPEC+ spare capacity and near-record U.S. shale output have acted as cushions limiting the magnitude of disruption so far.

Stocks Mixed as Rotation Plays Out

In equities, CNBC reported that the Nasdaq dipped 0.6% and the S&P 500 shed 0.2% Monday after earlier gains, while the Dow Jones Industrial Average outperformed, rising 328 points, or 0.6%, as money rotated into old-economy and defensive names. E-Trade's Chris Larkin told CNBC that the market faces more potential "volatility triggers" this week, including the midterms and jobs data, but that its "ability to bend but not break under pressure has been a positive sign."

Could the Diplomatic Track Collapse?

Trump posted on Truth Social on Oct. 8 that the U.S. "will not be attacking Iran any time prior to the [U.S.] Midterm Elections" on Nov. 3, according to the Arms Control Association, even after reports that the Pentagon had been asked to draw up strike options, as Yahoo Finance reported citing The Atlantic. That self-imposed timeline means the period immediately after the midterms is when markets may face the next real test of whether diplomacy or escalation prevails. Given the repeated cycle this year of diplomatic hope followed by renewed military threats, as both CNBC and the Arms Control Association documented, traders appear to be treating Monday's price drop as a provisional repricing rather than a durable removal of risk.

Bottom Line

Monday's plunge in oil prices and the mixed finish in U.S. stocks reflect a market reacting to genuine diplomatic signals from both Washington and Tehran, including Iran's reported conditions and Khamenei's grant of negotiating authority. But the unresolved dispute over uranium enrichment, Iran's own description of the U.S. response as "inadequate," and a track record of diplomatic optimism giving way to renewed escalation all suggest the risk premium embedded in oil prices has been only partially, not fully, unwound.