NEW YORK, March 31, 2026, 16:12 EDT
Stocks pared earlier losses Tuesday on renewed optimism around a possible resolution to the Iran conflict, yet signs of strain lingered across options markets, bonds, and currency trading. Investors noted that market makers have grown more wary, tightening up across the board and driving up both trading costs and difficulty.
The Cboe Volatility Index, known as the VIX, tracks trader expectations for S&P 500 moves over the coming 30 days, based on options prices. On Monday, it settled at 30.61—down a touch from Friday’s 31.05 print. The S&P 500, meanwhile, is staring down its roughest quarter going back to 2022.
The fallout stretched well beyond Wall Street. Europe’s STOXX 600 sank 8% in March, marking its sharpest monthly slide in almost four years. MSCI’s global stock index shed roughly 9% for the month—even with Tuesday’s rebound factored in.
Stress is now hitting trading mechanics too. Volatility indexes for bonds, oil, and gold shot up, touching marks that recall earlier crises. Morgan Stanley tracked a roughly 27% jump in bid-ask spreads for new two-year Treasuries in March — meaning the price gap between buyers and sellers widened sharply.
Investors spot it right away when they hit the market. “Cut the trades into smaller sizes,” dealers told clients, according to Rajeev De Mello at GAMA Asset Management. Morgan Stanley’s Daniel Aksan put it plainly: in some corners of the European rates market, trading liquidity shrank to just 10% of what’s typical. Reuters
Stocks surged Tuesday after reports surfaced that President Donald Trump was open to halting military action against Iran—even if the Strait of Hormuz remained mostly shut. Bill Northey at U.S. Bank Wealth Management flagged that what the market wanted was “a more normal flow of energy” through the critical passage. By the bell, the S&P 500 finished up 2.91%, Nasdaq climbed 3.84%, and the Dow closed ahead by 2.47%. Nvidia, Alphabet, and Meta were among those pacing the gains. Reuters
Still, the rebound hasn’t cleared up what volatility is signaling. Real Investment Advice pointed out Monday that implied volatility—the level options traders are bracing for—stayed notably higher than the actual daily moves in equities. That gap implies investors continue to shell out for hedges against a jolt the market hasn’t entirely baked in.
The concerns stretch past just the Iran situation. Matt Orton at Raymond James flagged inflation as a sticking point. James Ragan from D.A. Davidson pointed to AI shakeups and the rise of private credit—loans made outside the usual banking system—as sources of anxiety that were rattling investors even before the conflict escalated. Every one of the seven megacap tech names has slipped this quarter; Microsoft and Tesla have both dropped more than 20%.
Why does it matter? Tech giants underpin the indexes. With tech making up roughly a third of the S&P 500, Orton put it plainly: the broader market can’t steady itself until those heavyweights stop sliding.
Tuesday’s rally might not last. Robeco’s Colin Graham pointed out that markets are “taking Washington at their word” on a possible end to the war, but haven’t factored in a scenario where the Strait of Hormuz remains closed. If that drags on for another week or two, Graham sees recession risks climbing. BNP Paribas flagged a different worry: a drawn-out conflict could swell the U.S. deficit toward 8% of GDP, further pressuring a bond market already anxious about inflation. Reuters
The late-March VIX spike still hangs in the background, despite Tuesday’s stock gains. Oil, rates, and trading liquidity are telling a less settled story than the close alone shows. Investors look to have picked up a breather—not a guarantee.
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