SPX Double Diagonal – March 11, 2026

๐Ÿšฆ Market Regime & Term Structure

MetricValueStatus
VIX at Entry24.89๐ŸŸก Warning (Elevated Volatility)
Front IV (Mar 26)24.6%Elevated
Back IV (Apr 13)23.8%Relative Discount
IV Differential+0.8%Backwardation (Slight)

๐Ÿ› ๏ธ The Setup: Mar 26 / Apr 13

The “Secret Sauce” here is the volatility arbitrage. By selling the front-month at a premium over the back-month, we gain a tailwind if volatility mean-reverts. The risk graph shows a massive “Profit Tent” spanning over 700 points.

LegExpirationStrikeTypePrice
Short PutMar 266530Sell$55.31
Long PutApr 136575Buy$100.68
Short CallMar 266980Sell$17.00
Long CallApr 137000Buy$43.53

Net Debit: $7,190.00


๐Ÿ“Š Risk Profile Analysis

  • Breakevens: Between 6,293.65 and 7,051.21 (at Mar 26 expiration).
  • Max Profit: ~$8,223.80 (Occurs if SPX pins exactly at 6530 or 6980 on Mar 26).
  • Current Underlying: 6,761.56 (Sitting comfortably in the “valley” of the tent).

๐Ÿ“ˆ The Greeks: Health Check

GreekValueInterpretation
Platform Delta1.32Neutral. Virtually no direction risk at entry.
Net ThetaPositiveBenefiting from the rapid decay of the $6530$ and $6980$ shorts.
Net VegaPositiveProfit increases if IV expands in the back month vs the front.

๐Ÿ›ก๏ธ Management & Exit (The House Rules)

MilestoneActionLogic
+10% ProfitDecision GateMonitor SPX at 6,761. If it drifts toward 7,000, watch the Call peak.
+25% ProfitHard ExitPrimary Target. Take the win and move on.
-25% LossHard StopExit if the net value drops below ~$5,400.
48-Hour RuleTime ExitMarch 24. Close before the front-month Gamma becomes unmanageable.

๐Ÿง  Strategic Summary

The trade is currently sitting in the sweet spot. With the SPX at 6,761, we are positioned right between the two profit peaks. We have roughly 460 points of downside cushion and 290 points of upside cushion before hitting the breakevens. This is a high-probability “Theta-Harvesting” machine.

Process > Outcome. Stay disciplined.

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