$100 Oil. A War in the Middle East. And the S&P 500 Still Won't Fall. Here's Why
For three straight weeks, headlines screamed. Oil above $100. U.S. and Israeli strikes on Iran. The Strait of Hormuz, a narrow waterway responsible for nearly a third of all global maritime crude shipments, effectively shut down. Tankers on fire. Gasoline at the pump hitting prices Americans hadn't seen in years.
You'd expect a bloodbath in equities. A crash. A bear market. At minimum, a serious, sustained correction that wipes out months of gains and sends investors sprinting for the exits.
Instead? The S&P 500 barely moved. It dipped. It wobbled. It had some ugly days. But it held. And then, remarkably, it started bouncing back. Even as $100 oil persisted. Even as the war continued. Even as the Federal Reserve sat on its hands.
This is the question every investor, strategist, and market watcher is now asking: If geopolitical chaos and triple-digit oil prices can't kill the bull market, what can?
Let's dig in, because the answer is both more reassuring and more dangerous than most people realize.
The Shockwave: What Actually Happened When War Broke Out
The U.S.-Israeli military campaign against Iran began on February 28, 2026. The initial market reaction was immediate, and ugly. The Dow Jones fell more than 400 points that first day. The S&P 500 dropped 0.7%. But that was only the opening act.
Oil Hits $100, The Numbers Behind the Panic
What followed over the next two weeks was an energy shock of historic proportions. Brent crude surged roughly 40% from its pre-conflict levels, closing above $100 per barrel on March 12, the first time it had done so since August 2022. That single session saw a 9.2% jump. Then, following U.S. strikes on Iran's Kharg Island, it briefly spiked to around $106/bbl.
The Strait of Hormuz, Why This Chokepoint Matters So Much
In 2025, approximately 13 million barrels of oil per day transited the Strait of Hormuz, roughly 31% of all maritime crude shipments globally. When Iran's Revolutionary Guards commander declared the strait closed on March 2, warning that any vessel attempting passage would be set on fire, it wasn't just a military escalation. It was a direct threat to the global energy supply chain.
The IEA's head described the resulting crisis as "the greatest global energy security challenge in history." Maritime shipping costs quadrupled as tankers rerouted around the Cape of Good Hope, adding thousands of miles and days to every voyage.
And yet. The S&P 500 didn't collapse. Not by a long shot.
The Market's Surprising Response: Resilience, Not Collapse
Here's the number that should stop every investor in their tracks: through all of this, the S&P 500 was down only about 2–4% from its highs as the conflict unfolded. International markets? A very different story. Japan, South Korea, and the euro area each declined by 8% or more, because those economies are deeply energy-import dependent.
America, somehow, held on.
The S&P 500 Is Down Just ~4%, Is That a Big Deal?
Technically, yes, on March 19, the index closed at 6,606, breaking below its 200-day moving average for the first time in 214 sessions. That's a real technical warning signal. But in context? A 4% drawdown while the Strait of Hormuz is closed, oil is at $100-plus, and a war is actively unfolding in the Middle East is… remarkably contained.
Why U.S. Equities Shrugged (Mostly)
There are four interconnected reasons the market didn't fall apart, and understanding all four matters if you want to know when (and if) it eventually will:
- The AI backbone: Technology stocks, particularly AI-centric companies like NVIDIA, Microsoft, and Alphabet, are, at least partly, decoupled from the physical constraints of the oil market. They don't run on crude. They run on compute.
- U.S. energy independence: America is a top oil producer. Unlike Japan or Germany, the U.S. imports only a minimal fraction of its oil from the Strait of Hormuz. The physical pain of this shock lands hardest elsewhere.
- Hope for a short conflict: Markets are exceptional at pricing optimism. The expectation, still alive as of this writing, is that the conflict resolves "in the near term, rather than months," as White House economic adviser Kevin Hassett put it.
- Broad underlying fundamentals: Evercore ISI raised its 2026 S&P 500 EPS forecast to $304, citing robust Q4 results. Goldman Sachs estimated AI investments could account for roughly 40% of S&P 500 earnings growth in 2026. The profit engine didn't stop.
The Hidden Pillars Holding Up the Market
Think of the S&P 500 right now like a table with four legs. One leg, energy/geopolitics, is wobbling badly. But the other three are still solid. Here's what those other legs are made of.
The AI Economy as a Geopolitical Shock Absorber
This is genuinely new. In past oil crises, the 1973 OPEC embargo, the 1990 Gulf War spike, the 2022 surge following Russia's invasion of Ukraine, there was no significant sector of the U.S. economy that was energetically insulated from crude prices at this scale.
In 2026, there is. The Big Four AI hyperscalers, Microsoft, Alphabet, Amazon, Meta, have combined capital expenditures projected at $505 billion in 2026. These companies run on electricity and silicon, not petroleum. When oil spikes and consumer discretionary stocks bleed, AI infrastructure stocks have provided what analysts are calling a "geopolitical hedge" embedded right inside the index itself.
Goldman Sachs noted that "the supply shock today appears narrowly concentrated in the energy sector", a crucial distinction from the 2021–2022 inflation surge that rattled the entire global economy. AI-centric tech has kept the index from capitulating.
U.S. Energy Independence Is a Game Changer
President Trump made the point bluntly: China sources about 90% of its oil through the Strait of Hormuz. The United States? A minimal amount. This asymmetry is doing serious work in the stock market. When a supply shock is geographically concentrated in its pain, hurting Europe and Asia far more than the U.S., capital actually flows into American equities as a safe haven, partially cushioning what would otherwise be a steeper decline.
Goldman Sachs, LPL, Morgan Stanley All Say the Same Thing
When the three biggest names on Wall Street converge on a message, it's worth pausing to hear it. All three have published research drawing on historical data to argue that geopolitical shocks, while painful in the short term, rarely cause lasting damage to diversified U.S. equity portfolios.
Morgan Stanley found that over 75 years, the S&P 500 rose an average of 8.4% in the 12 months following major geopolitical shock events. LPL Research's review of 26 geopolitical events going back over 80 years showed average S&P 500 pullbacks of just 4.5%, with markets typically stabilizing in less than a month. Goldman's own analysis of seven similar episodes since 1950 found the index declined an average of 4% in the first week, but recovered within the following month.
History Speaks: What Past Oil Shocks Did to the S&P 500
Here's the honest, slightly uncomfortable truth: history is reassuring, but only up to a point. Goldman Sachs also studied four severe oil supply shocks and found that the full peak-to-trough damage often played out over months, not days. The early resilience can be misleading. The market may be, as Goldman noted, only "in the early innings of repricing."
Sources: Goldman Sachs equity strategy research, LPL Research, Morgan Stanley Wealth Management, S&P Global. Past performance does not guarantee future results.
The lesson from this table? Short-term resilience is not the same as long-term safety. The 1973 and 2022 scenarios, both prolonged supply shocks, led to deep, extended bear markets. The 1990 and 2003 events, where the underlying conflict resolved relatively quickly, led to powerful recoveries. The duration of the current Iran conflict is therefore the single most important variable in the market's 2026 story.
What Could Actually Stop the S&P 500?
This is the question that matters most. And the honest answer is: several things could. They're not guaranteed. But they're real, and investors should watch for them with clear eyes.
Conflict Drags On + Inflation Reignites
Oil futures suggest prices may not return to pre-war levels until August 2026. If that holds, higher energy costs seep into core CPI, forcing the Fed to delay or reverse rate cuts. That changes everything for stock valuations. "Higher for longer" rates are the market's kryptonite.
The Fed Gets Forced to Hike Again
The Fed held at 3.5%–3.75% in March. But 30-year Treasury yields are already testing 5%. If energy-driven inflation breaches the Fed's targets convincingly, a rate hike in H2 2026 would hit equity valuations like a brick wall, especially tech stocks with high price-to-earnings multiples.
The 200-Day Moving Average Has Already Broken
On March 19, the S&P 500 closed below its 200-DMA for the first time in 214 sessions. This is a serious technical signal. It doesn't guarantee a bear market, but it's the kind of level where institutional trend-following funds begin systematic selling. Watch this closely.
There's also a fourth, less-discussed scenario: a private credit crisis. Elevated interest rates combined with rising energy costs are beginning to pressure leveraged borrowers. A crack in private credit markets, where visibility is already limited, could amplify any equity drawdown rapidly.
What Smart Investors Are Doing Right Now
Let's be honest about something: the instinct to sell everything and wait in cash during a war feels completely rational. It feels like prudence. But historically, that instinct has cost long-term investors dearly, far more than the wars themselves.
Don't Time the Market, Time Your Emotions
LPL Research put it plainly in their latest commentary: "It's human nature to want to sell stocks and sit in cash." But in 26 geopolitical events spanning eight decades, diversified portfolios consistently recovered. The investors who got hurt most weren't the ones who held, they were the ones who panic-sold at the bottom and waited too long to reinvest.
The single best thing most investors can do right now is the same thing that's always true: stay diversified, stay invested, and stay focused on time horizons longer than the current news cycle.
Sector Rotation: Where Smart Money Is Moving
- Energy sector: XLE, VDE, and IXC ETFs have hit 52-week or all-time highs. Oil field services firms like Baker Hughes and Halliburton are up 4%+ in recent sessions. If you're not positioned here, you're leaving obvious upside on the table.
- Defense & aerospace: Military conflict is a reliable catalyst for defense spending increases. Lockheed Martin, Northrop Grumman, and related ETFs are attracting institutional capital. This is one of the clearest sector plays in the current environment.
- AI infrastructure, selectively: NVIDIA fell on rising data center energy cost concerns, but the long-term thesis is intact. Goldman estimates AI could contribute ~40% of S&P 500 EPS growth in 2026. The "AI dream" hasn't died, it's entered a more sober phase. Quality AI plays on dips remain attractive for long-term holders.
- Avoid high-energy-cost retailers: Consumer discretionary names like Macy's, Lululemon, and travel-adjacent stocks face a genuine "tax at the pump" headwind. The American consumer is resilient, but $3.79/gallon gasoline is starting to bite.
The new watchwords on Wall Street are "geopolitical sovereignty", companies with domestic supply chains, pricing power, and low energy sensitivity. Think less about chasing growth at any price, and more about resilience at a reasonable price. That shift in framing may define returns for the rest of the decade.
So, Can Anything Actually Stop the S&P 500?
Here's the straightforward answer: yes. Something can stop it, and the conditions for that scenario are very much alive.
But, and this is the part that gets lost in the fear, the current resilience of U.S. equities isn't denial or complacency. It's the rational reflection of structural realities: U.S. energy independence, the AI-driven earnings engine, a Fed that hasn't been forced to act aggressively, and a stock market with an 80-year track record of shrugging off geopolitical chaos faster than anyone expects.
The market is currently making a bet. The bet is that this conflict resolves before the oil shock becomes a full-blown inflation re-escalation, before the Fed's hand gets forced, before corporate margins get crushed, before the consumer truly breaks. That bet could prove correct. It's proven correct more often than not in history.
But it's a bet, not a guarantee. And the clock is running.
Watch three things: the status of the Strait of Hormuz, the trajectory of core CPI in April and May, and whether the S&P 500 can reclaim its 200-day moving average. Those three data points will tell you more about the market's next major move than any single headline will.
And whatever you do, don't let fear make the decision your strategy should be making.