May 2026 will be remembered as the month the war premium broke. After a 13-week paralysis around the Strait of Hormuz, a U.S.–Iran ceasefire framework brokered in the final week opened a path to de-mining the world's most critical oil-shipping chokepoint. Crude collapsed roughly 20% from its 2026 highs, gasoline retreated, and the inflation-scare narrative that had dominated April was replaced by a renewed conviction in disinflation. The S&P 500 closed May at a fresh record 7,580.06, advancing 5.15% on the month and extending its winning streak to nine consecutive weeks — the longest run since 2023. The Nasdaq Composite outperformed with an 8.36% monthly gain on a renewed AI-capex bid, the small-cap Russell 2000 added 4.27%, and the Dow climbed 2.78%.

The Iran Ceasefire and the Strait of Hormuz

The defining event of the month was the announcement late in May of a 60-day ceasefire framework between the United States and Iran, with the Strait of Hormuz to be de-mined and reopened to commercial shipping under the auspices of a multilateral monitoring arrangement. In exchange, the U.S. agreed to lift its blockade on Iranian ports and issue selective sanctions waivers to allow Iranian crude back onto world markets. The framework was not without setbacks — Iran fired a ballistic missile at a U.S. air base in Kuwait on May 28 (shot down without casualties) and a brief U.S. retaliatory strike sequence kept tail risks visible — but the directional shift was decisive. WTI crude closed May at $87.36 per barrel, down from $104.84 at the end of April, while Brent settled near $91.12 — its lowest level in roughly six weeks and on pace for its largest monthly loss since 2020. The implied easing of headline inflation, in turn, was the dominant tailwind for risk assets.

Powell Hands Over the Gavel · Warsh Confirmed 54–45

On May 13, 2026, the Senate confirmed Kevin Warsh as the eleventh Chair of the Federal Reserve in the modern era by a 54–45 vote — the narrowest margin in the history of the position. Only Pennsylvania Democrat John Fetterman crossed party lines to back the nominee. Chair Jerome Powell's term as Chair concluded on May 15; he will remain on the Board of Governors for the duration of his governor term. Warsh was sworn in at the White House on May 22 — the first Fed Chair to take the oath there since Alan Greenspan in 1987 — pledging the Committee's independence, acknowledging the lagged disinflationary effects of the energy reversal, and reiterating data dependence ahead of the June 16–17 FOMC meeting. There was no FOMC meeting in May, leaving the federal funds target range at 3.50%–3.75%.

April CPI: Headline Inflation Climbs to a Three-Year High

The April CPI report, released on May 12, showed the all-items index rising 3.8% year-over-year — the highest reading since May 2023 and up from March's 3.3%. The headline figure climbed 0.6% month-over-month. Energy alone surged 17.9% year-over-year, with gasoline up 28.4%. Importantly, core CPI rose just 2.8% — confirming that the inflation impulse remained a supply-side, energy-driven phenomenon rather than a re-broadening into services. The subsequent April PCE report, released May 28, showed headline PCE at 3.8% and core PCE at 3.3%. Markets concluded that with crude already retracing, the worst of the energy pass-through was behind them.

Nvidia and the AI-Capex Bid

The Nasdaq's 8.36% May advance was anchored by a blockbuster Q1 FY27 print from Nvidia, reported after the close on May 20. Revenue of $81.6 billion beat the $78.86 billion consensus and was up 85% year-over-year, with Data Center revenue of $75.2 billion, up 92%. The company authorized an additional $80 billion share repurchase and raised its quarterly dividend twenty-five-fold to $0.25. Micron followed on May 26 with a 19% single-day surge — driven by a UBS price-target hike from $535 to $1,625 — that pushed the memory-chip maker past a $1 trillion market capitalization for the first time. Walmart's May 21 report — Q1 FY27 total revenue of $177.8 billion (up 7.3% YoY) and U.S. comparable sales up 4.1% — reassured investors that the consumer was absorbing tariff and energy pass-through.

The Trump–Xi Beijing Summit

President Trump and President Xi Jinping met in Beijing on May 14–15, the rescheduled version of the summit originally slated for March. The headline deliverables: a Chinese commitment to purchase $17 billion in U.S. agricultural products annually through 2028, the restoration of market access for U.S. beef and poultry, an offer from Beijing to help facilitate de-mining of the Strait of Hormuz, and the chartering of two new bilateral institutions — the U.S.–China Board of Trade and the U.S.–China Board of Investment. Outcomes on semiconductors and rare earths were narrower than markets had hoped, but the de-escalation removed a meaningful tail risk and provided incremental support to multinational earnings expectations.

The Dollar, Gold, and Bitcoin

The U.S. Dollar Index drifted higher to close May near 98.94, a modest 0.86% gain on the month as the rate-differential narrative reasserted itself in the absence of crisis-bid flows. Gold, the standout haven of the prior six months, paused for breath: spot prices touched a two-month low near $4,380 on May 28 before rebounding to an LBMA PM Fix of $4,545.95 on May 29 — down 2.09% on the month but still up 5.47% year-to-date. Bitcoin, by contrast, failed to catch the risk-on bid: weighed by ETF outflows and continued long unwind from the October 2025 peak, BTC slipped to roughly $73,876 over the May 30–31 weekend, down 3.16% on the month and 15.6% year-to-date — confirming that gold has decisively led the haven trade in 2026.

OPEC+ Without the UAE

The first OPEC+ meeting following the UAE's May 1 formal exit from the cartel produced, on May 3, a modestly accelerated supply increase of 188,000 barrels per day for the seven remaining voluntary-cut participants. The increment was largely symbolic — sanctioned barrels in Iran and Russia limit effective marginal supply — but it underscored Saudi Arabia's willingness to defend market share even as the demand side improves with the prospective Hormuz re-opening. The combined effect on the curve was a meaningful flattening of the front-month spread and a more orderly path back toward $80 Brent.