S&P 500 and Nasdaq Reach Record Highs Amid AI Rally

The U.S. stock market rose on May 11, with the S&P 500 and Nasdaq trading at or near all-time closing highs, according to Reuters. The PHLX Semiconductor Index climbed about 2.5%, Reuters reports, with chipmakers broadly outperforming the broader market. Reuters quotes Ross Mayfield, an investment strategy analyst at Baird, saying, "The semis and AI infrastructure trade has taken on a life entirely of its own." AP reports the S&P 500 was up 0.3% from its record set Friday and the Nasdaq was likewise higher and on track for an all-time high.

Energy markets pushed higher as diplomatic talks between the U.S. and Iran stalled and the Strait of Hormuz remained effectively closed in parts, Reuters and Bloomberg-based coverage indicate. AP reports Brent crude rose to $104.02 a barrel, an intraday advance of about 2.7%, and Reuters describes oil rising roughly 3% on the session. Reuters also reports that 440 companies in the S&P 500 had reported first-quarter results and that 83% of those had topped earnings expectations, citing LSEG IBES.

Equity gains were concentrated in semiconductor and AI-infrastructure-related names rather than broad cyclical sectors, per Reuters market data showing outsized moves in the PHLX Semiconductor index. For practitioners, this pattern reinforces that near-term demand signals for chips and AI hardware remain a material factor for vendor selection, procurement timing, and capacity planning in data-center projects.

Geopolitical pressure from the Iran conflict continues to lift oil prices and push up yields, which typically raises input costs for energy- and transport-intensive companies. At the same time, strong corporate earnings early in the reporting season, as measured by LSEG IBES and reported by Reuters, have kept investor focus on technology earnings momentum. Observed patterns in similar market episodes show that concentrated rallies led by a sector, like semiconductors, can outpace broader macro concerns for multiple sessions before the breadth of gains widens or reverses.

For practitioners: Monitor upcoming macro datapoints and remaining earnings releases this reporting cycle; Reuters notes that the first-quarter reporting period is nearing its home stretch. Also watch oil and shipping-route developments around the Strait of Hormuz for potential second-order effects on logistics, input-cost inflation, and hardware supply chains. Market reactions to further diplomatic activity between the U.S. and Iran, including any mediated talks reported by outlets such as Reuters and AP, will be relevant for risk models that include energy-price shocks.

Procurement and capacity-planning teams should track semiconductor inventory and lead-time updates from suppliers, since sector-specific rallies often compress supply quickly. Observed patterns in previous cycles indicate that a sustained AI-driven hardware surge often changes vendor negotiation dynamics and prioritization of capital budgets.

All index moves, percentage changes, and corporate earnings statistics in this report are drawn from Reuters and AP coverage of U.S. markets on May 11, 2026, with additional market framing from Bloomberg-based reporting carried by SwissInfo and other outlets. "The semis and AI infrastructure trade has taken on a life entirely of its own," is attributed to Ross Mayfield and reported by Reuters.