The S&P 500 rose 0.54% to 7,815.52, sitting just points below its 52-week high of 7,835.09 set earlier this year. The Nasdaq Composite gained 0.58% to 27,635.36, nearly matching its own record high of 27,693.19. The Dow Jones Industrial Average added 0.41% to close at 51,477.43, though it remains further below its 52-week peak near 54,744.
The market's calm stands in contrast to escalating tensions at sea. Nearly 20 commercial vessels, the majority of them oil tankers, have been targeted in attacks while transiting the Hormuz chokepoint over the past month, according to the data reviewed by LoopWire. The strait is a vital artery for global crude shipments, and any sustained disruption there carries the potential to tighten supply and push energy prices higher worldwide.
So far, investors appear to be looking past the risk, with all three major indexes advancing in Tuesday's session. That resilience may reflect confidence that global oil supply can absorb the disruption for now, or simply that markets have not yet fully priced in the possibility of a broader supply shock. Energy markets, however, are likely to stay on alert, since further attacks could quickly reverse that calm if shipping companies begin rerouting vessels or insurers raise costs for passage through the strait.
The tanker attacks also arrive against a backdrop of other energy-related strain in the U.S. economy. Diesel prices have already surged to records domestically, a separate pressure point tied to broader fuel supply disruptions. A worsening of the Hormuz situation could compound that stress, given the region's outsized role in global crude flows.
For now, equity investors are treating the geopolitical risk as a background concern rather than a market-moving threat, with both the S&P 500 and Nasdaq trading within arm's reach of record territory. But with attacks continuing on a weekly basis, traders will be watching closely for any sign that the risk premium on oil begins to show up in broader market pricing, particularly if shipping disruptions intensify or spread to other vessels in the corridor.