Wall Street Is the Biggest Winner of the Iran War—And the S&P 500 Just Turned Positive for the Year

Why It Matters

The move shows how geopolitical headlines can be leveraged for outsized returns, underscoring the importance of timing and sentiment in equity markets. It also signals that investors remain confident in corporate earnings even as the Iran conflict persists.

Key Takeaways

• S&P 500 rose 1.02% to 6,886, erasing Iran war losses
• Brent crude fell ~4% to $4.50, then rebounded above $103
• Wall Street's 'TACO trade' gains 35% return on ten de‑escalation sessions
• Morgan Stanley cites double‑digit EPS growth as bullish earnings catalyst
• Trump’s blockade threats spark short‑term rally despite ongoing conflict

Pulse Analysis

The Iran conflict has become a surprisingly reliable catalyst for market swings, but the underlying driver is less about the war itself and more about how investors interpret risk signals. When a low‑profile X post hinted at possible nuclear‑deal negotiations, traders quickly priced in a de‑escalation scenario, sending Brent crude tumbling and equities soaring. This rapid reaction illustrates the market’s heightened sensitivity to any hint of diplomatic progress, especially when it aligns with the historical pattern of the so‑called "TACO trade"—a term coined after former President Trump’s habit of pulling back on aggressive policies, prompting a surge in risk‑on assets.

The "TACO trade" has evolved from a tongue‑in‑cheek joke into a measurable strategy. Data from MarketWatch shows that nine of the ten best S&P 500 days since Trump’s second term were tied to de‑escalation events, delivering a compounded 35% return for traders who captured only those sessions. This outsized performance contrasts sharply with the index’s roughly 13% gain over the same period, highlighting the premium placed on timing geopolitical news. Asset managers now monitor political chatter as closely as earnings releases, treating each diplomatic flare‑up as a potential entry point.

Beyond the headline drama, fundamentals remain a key anchor. Morgan Stanley’s latest note points to double‑digit earnings‑per‑share growth across the median S&P 500 company—the fastest pace since 2021—suggesting that corporate profitability can sustain the rally even if the Iran war drags on. Investors are betting that earnings momentum will outpace any lingering supply‑side shocks from oil price volatility. In this environment, the blend of geopolitical sentiment and solid earnings fundamentals creates a fertile ground for continued equity upside, provided traders stay disciplined about the fleeting nature of headline‑driven moves.