Markets Tested as Iran Conflict Continues

In our 2026 Outlook: The Policy Engine, we listed several risks to stocks that could prevent the S&P 500 from achieving our forecast for high-single-digit returns in 2026 (to a fair value target range of 7,300–7,400). One was narrow stock market leadership. Well, as mega cap technology leadership faded in recent months, the cyclicals and defensives picked up the slack. The traditional market-cap-weighted S&P 500 Index is down 1.5% year to date as of March 6, 2026, but the average stock in the index is up 3.2%.

Another risk we cited was a potential artificial intelligence (AI) bubble. Although scrutiny on AI and fears of business model disruption have increased, we wouldn’t call AI a bubble with NVIDIA (NVDA) shares trading at a price-to-earnings ratio (P/E) of 21.6 based on the consensus earnings estimate over the next four quarters (by no means is this a recommendation, but NVDA grew revenue more than 70% and nearly doubled its net income last quarter). Rising interest rates and midterm elections, both largely non-factors so far, were also on our 2026 risk list.

What about geopolitical risk? Yes, it was there, too. Last week reminded us why geopolitical threats should always be on lists of risks from Wall Street strategists. It’s just a matter of time before it comes around again. Our key message for investors dealing with these unnerving headlines and market volatility is simple. Be patient. Stay diversified. Maintain balanced portfolios that include some investments well-positioned for volatility. Look for opportunities on the other side. Those who ride out the ups and downs, in time, will be grateful they did.

Checking the Oil Under the Hood

It’s difficult to separate the human and emotional side of war from the economic and market impacts. Without minimizing the human element, we focus on markets here. From that perspective, the energy market is the primary way through which this crisis will affect markets globally. Oil and natural gas production and transit have already been disrupted, sending prices sharply higher. If these disruptions are severe and long lasting, they have the potential to influence inflation expectations, weigh on business confidence, and elevate volatility across asset classes, all of which will likely translate into lower stock prices. Simply put, the more intense and prolonged the geopolitical shock, the larger the likely market impact.

The center of this crisis lies in the Strait of Hormuz, a vital waterway that carries 20% of the world’s oil supply. Oil and liquified natural gas (LNG) traffic through the strait is at a standstill, but at this point we don’t have any reason to expect the logjam to continue for more than a few weeks. That should hopefully give the Trump administration and allies in the Persian Gulf region enough time to eliminate, or dramatically reduce Iran’s drone stockpile and missile launch capabilities, better defend against Iran’s drone attacks on oil tankers, and ensure the ships can pass through. For a persistent rise in crude prices to materialize, markets would likely need evidence of a more prolonged shutdown of the Strait. President Trump controls the timeline here, but in the fog of war, timelines can change.

Bottom line: Watch the flow of oil and oil prices to gauge the effects of the conflict on economic growth and inflation. A meaningful escalation could potentially disrupt energy markets enough to push oil prices well over $100 a barrel and keep them there. A dozen countries have already been hit by Iranian strikes. This scenario remains unlikely in our view, especially in a midterm election year, but it’s possible. We’ve already seen the Trump administration grant India a 30-day waiver to import Russian oil to help alleviate some of the upward pressure on oil prices. More actions by the administration to contain oil prices are forthcoming.

Oil Prices Surged, Strait of Hormuz Tanker Traffic at a Standstill