The Cboe Volatility Index (^VIX) climbed 6.83% to 18.15 through the Monday open, its sharpest one-session percentage advance since the late-March bond market wobble. The move was driven by aggressive May and June S&P 500 put accumulation: the SPX put-to-call ratio hit 1.42 — the highest since the early-October regional bank scare — with the 6,950–7,000 strike cluster trading roughly 4.6x the 21-day average daily volume.
The VIX term structure flattened sharply: front-month vs. four-month spread compressed to 0.85 points from 2.10 at the Friday close, the flattest configuration since November 4, and a setup classically associated with hedger demand running ahead of dealer supply. The Cboe SKEW index rose to 152.4 from 145.6, signaling out-of-the-money put richness even as at-the-money implied vol moved up.
Geopolitical Drivers
Day 67 of the Israel-Iran conflict opened with two overnight Israeli Air Force strikes on Bandar Abbas naval installations and a reported Iranian medium-range ballistic missile launch toward the central Negev — intercepted by Arrow-3. Brent crude opened at $96.40 a barrel — up 1.9% from Friday — the highest opening level in eight sessions. Pentagon press secretary Sabrina Singh confirmed the deployment of an additional Patriot battery to the Al-Udeid base. Tail-risk indicators in oil are rising: the WTI 25-delta risk reversal jumped to a 3.4-vol skew toward calls, the steepest right-skew since the 2022 Ukraine invasion.
Macro Cross-Currents
Friday's March PCE print of 2.7% headline and 2.6% core year-on-year — both 10 basis points above consensus — catalyzed a 6 basis-point sell-off in the 2-year U.S. Treasury yield to 4.21%, with Fed Funds futures now pricing only 38% probability of a June 17 cut. The CME FedWatch terminal cut probability for 2026 dropped to 1.6 from 2.4 in 24 hours. Dollar-Index DXY printed 105.20 — a fresh 2026 high — pressuring the EUR/USD lower to 1.1696 and GBP/USD to 1.3541.