Executive Summary 

May 2026 was the month the Iran war’s grip on commodities finally began to loosen — and markets responded with a measured but broad-based advance. Brent crude fell from above $116 at the start of the month to close below $95 on May 29, delivering the largest single-month oil price decline since the conflict began in late February. That disinflation impulse did not ignite another April-style euphoria, but it provided the macro backdrop for equities to grind higher, with the S&P 500 and Nasdaq closing the month at new all-time highs for the eighth consecutive week. 

The S&P 500 returned approximately 4.6%, while the Nasdaq Composite gained around 5.8%, its second consecutive month of meaningful outperformance. The Dow Jones added roughly 3.2%, and the Russell 2000 lagged, ending the month up just over 1% as the small-cap index faced headwinds from still-elevated yields and a mid-month Treasury sell-off triggered by hotter-than-expected CPI data. The dominant narrative of the month was the convergence of three epochal events in a single 48-hour window: Nvidia’s blockbuster Q1 FY2027 earnings, SpaceX’s S-1 filing for what would be the largest IPO in U.S. history, and Cerebras Systems completing a $5.55 billion debut. Together, these events cemented the market’s conviction that the AI infrastructure cycle is accelerating, not plateauing. 

Equity Markets Performance 

U.S. equity markets advanced in May, led again by the Nasdaq, though with notably narrower leadership than April’s broad surge. The S&P 500 gained approximately 4.6%, closing the month around 7,564, extending its eight-week winning streak despite a mid-month wobble when the 10-year yield briefly touched its highest level in a year following a hot inflation print. The Dow Jones added around 3.2%, reflecting more modest exposure to the AI semiconductor supply chain. The Russell 2000 posted a muted gain of approximately 1.5%, weighed down by sensitivity to the yield spike and a weaker response to the oil deflationary impulse given small-cap energy exposure. 

The Nasdaq Composite was the standout performer, gaining approximately 5.8%, driven by Nvidia’s earnings and the wave of AI-related sentiment that followed SpaceX’s IPO filing. International markets had a more mixed month. European indices made modest gains as oil’s decline eased input cost pressure, while India’s equity market sold off sharply on continued geopolitical risk aversion, rupee weakness, and elevated crude prices through the first half of the month. 

Sector Performance 

May’s sector picture was narrower than April’s, with AI-adjacent technology and communication services again leading while energy and healthcare lagged. Nvidia’s Q1 FY2027 earnings — revenue of $81.6 billion, up 85% year-over-year and ahead of the $79.2 billion consensus estimate — served as the catalyst that kept the technology trade alive even as yields rose. 

• Information Technology (XLK): Led the tape for the second consecutive month. Nvidia’s beat and the SpaceX/Cerebras IPO tailwinds drove semiconductor and mega-cap software names higher. The sector remained the dominant source of index alpha, though gains were more concentrated than in April’s 25% surge. 

• Communication Services (XLC): Continued to advance on AI monetization themes, with Alphabet and Meta sustaining momentum from Q1 earnings. 

• Consumer Discretionary (XLY): Supported by falling oil prices, which improved consumer spending expectations, and by Amazon’s resilience in the face of macro uncertainty. 

• Energy (XLE): The month’s notable laggard. Brent crude’s decline from $116 to below $95 — driven by credible ceasefire extension talks and IEA SPR releases — compressed energy sector earnings expectations and triggered profit-taking after March’s war premium rally. 

• Healthcare (XLV): Underperformed as capital continued to rotate toward growth. No single catalyst dragged the sector; it simply lost the tug-of-war for allocation against technology in a risk-on environment. 

Fixed Income 

The Treasury market had a volatile month, with yields surging sharply in the middle before partially recovering by month-end. The 10-year yield closed May at 4.45%, up approximately 6–7 basis points on the month but well off the intra-month high reached when CPI printed at 3.8% year-over-year on May 15, the highest annual pace since early 2023. The 2-year yield closed at 3.98%, and the 30-year at approximately 4.98%. The yield curve steepened modestly over the month, with the 10-2 spread widening to around 47 basis points as the long end repriced faster than the front end. 

The Federal Reserve held rates steady, as universally expected. Fed funds remain at approximately 3.5%, and the May FOMC meeting produced no surprises. However, the reinstatement of rate hike pricing was the month’s fixed income story: futures markets ended May assigning roughly 46% probability to a rate hike by December 2026, a dramatic shift from the multiple-cut scenario that was priced at the start of the year. PCE data released late in the month came in marginally below expectations on a monthly basis, but annual headline and core PCE at 3.8% and 3.3% respectively remain well above target, keeping the Fed firmly on hold and leaving hike risk meaningful. 

Commodities 

Metals 

Gold weakened through most of May as yields rose and the dollar strengthened. The metal closed the month near $4,524 per ounce, down roughly 2% from April’s close near $4,615. The mid-month inflation shock was the primary headwind, pushing real yields higher and reducing the relative appeal of non-yielding assets. Central bank buying continued to provide a floor, but the combination of a stronger USD and a hawkish repricing of Fed expectations capped any recovery. 

Silver also retreated through the month, retreating from April’s elevated levels as the gold-silver ratio widened. The partial unwind of oil-driven industrial demand expectations weighed on the metal’s dual-use premium. 

Energy 

The defining commodity story of May was the dramatic decline in Brent crude. The contract opened the month near $116 per barrel and closed near $94, a move of approximately 19% in a single month — the largest monthly decline since the conflict began. The driver was a credible ceasefire extension framework: reports in the final week of May indicated that the U.S. and Iran had reached a preliminary understanding to extend the ceasefire by 60 days and begin structured nuclear program discussions, though President Trump had not formally endorsed the terms by month-end. 

The IEA continued coordinated SPR releases. California gasoline prices, which had peaked above $6 during the height of the blockade, began retreating, providing modest relief to U.S. consumers and improving the headline inflation trajectory for coming months. Natural gas remained relatively stable. The speed of oil’s decline introduced a new risk: deflation in energy, if sustained, could flip the earnings revision cycle for the energy sector sharply negative. 

Cryptocurrency 

Bitcoin had a volatile and ultimately disappointing month, opening near $80,000 with strong institutional ETF inflows before fading sharply as the mid-month Treasury sell-off tightened financial conditions. The U.S. spot Bitcoin ETF complex recorded net inflows of approximately $700 million in early May, with BlackRock’s IBIT and Fidelity’s FBTC leading institutional flows. However, the Coinbase Act (Clarity Act) regulatory tailwind was partially offset by the same yield dynamics that pressured gold, and BTC closed the month near $73,700 — down approximately 8% on the month and still well below its October 2025 all-time high of $125,100. 

Late-month data flagged a $1.47 billion weekly outflow from digital asset funds in the final week, the largest of 2026, suggesting institutional caution as the dollar and yields rebounded from their intra-month lows. The digital gold narrative remains intact structurally, but the near-term correlation with real yields has reasserted itself. 

International Markets 

• MSCI EAFE (Developed): Modest gains as European and Japanese equities benefited from the oil price decline in the second half of the month. The ECB held rates steady at 2.0%, and European data remained stable if uninspiring. UK markets outperformed slightly on energy sector relief. 

• MSCI Emerging Markets: A split month. AI supply chain names in Taiwan and South Korea retained their momentum from April, while India was a notable drag. China’s CSI 300 gained approximately 3.0% as domestic A-shares were supported by state-linked buying, though MSCI China declined around 2.8% as offshore sentiment remained cautious. 

• China (CSI 300): +3.0% — Steady domestic bid supported A-shares. Retail sales continued to weaken and industrial production disappointed, but domestic AI hardware names and policy support underpinned onshore equities. Beijing continued to benefit from discounted Russian and Central Asian oil sourcing. 

• India (Nifty 50 / Sensex): The Sensex closed May at approximately 74,776, down from 76,913 at the end of April — a decline of around 2.8%. The month was a risk-off episode for Indian equities: escalating geopolitical concerns early in the month, a record-low rupee, and sustained foreign institutional selling drove some of the steepest single-day declines in over a year. The IT services sector continued to lag on AI outsourcing displacement concerns. 

Outlook: June 2026 

Three variables will dominate June. First, the Iran ceasefire extension. If the preliminary U.S.-Iran framework is formally endorsed and the Strait of Hormuz reopens on a sustained basis, the disinflationary impulse from oil would accelerate, improving the PCE trajectory and materially reducing the probability of a December rate hike. That scenario would likely be broadly positive for equities — particularly rate-sensitive sectors like real estate and small caps — while pressuring energy and strengthening duration assets. A breakdown back into active conflict would reignite March’s playbook.