Building a GEX-Based Portfolio
One gamma trade is a tactic. A portfolio built on gamma requires deciding how much of your risk budget belongs to each regime, how correlated your positions really are, and what happens when every name flips at once.
Budget risk by regime, not by ticker
Group positions by the regime that has to hold for them to work. Five credit spreads on five different tickers, all requiring positive gamma, are one bet. Cap total risk per regime bucket at a fixed percentage of account equity.
- Cap regime-bucket risk at 4–6% of equity; single position at 1–2%.
- Track net portfolio delta, gamma and vega, not just per-trade max loss.
- Hold at least one structure that profits if the dominant regime breaks.
Correlation is higher than it looks
Index-component gamma profiles are driven by the same index-level flow. During stress, single-name correlation to SPY approaches one, so diversification across tech names buys almost nothing. Diversify across regime dependence and across time horizon instead.
Laddering expirations
Mixing 0DTE, weekly and monthly structures smooths the gamma profile of your own book: short-dated positions carry the tactical edge while longer-dated ones anchor exposure and reduce the frequency of forced decisions.
Rebalancing rules
Rebalance on regime change and on breach of a bucket cap, never on P&L alone. Write the triggers down; discretionary rebalancing during a negative-gamma session is how portfolios turn into single trades.
A worked $100,000 account example
Suppose a $100,000 account runs three positive-gamma-regime credit spreads: an SPY put spread risking $900, a QQQ put spread risking $850, and an AAPL put spread risking $700, for $2,450 total risk, roughly 2.45% of equity. Because all three depend on the same broad-market positive-gamma regime, they belong in a single 'positive-gamma equity' bucket, not three independent 1% bets. If the bucket cap is set at 5% of equity, there is room for one more similarly sized position, but not five more. Alongside that bucket, holding a small long-gamma-agnostic hedge, such as a cheap 30-delta SPY put bought outright for $300, gives the book a position that gains if the dominant regime breaks and the other three spreads are simultaneously stressed.
- Sum max loss across positions sharing a regime dependency before comparing to a bucket cap.
- A 2.45% combined risk on three correlated spreads is closer to one 2.45% trade than three separate 1% trades.
- A small standalone hedge outside the dominant regime bucket reduces the tail outcome when the regime flips.
Key takeaways
- Positions sharing a regime assumption are one position.
- Manage net portfolio Greeks, not a collection of max-loss numbers.
- Rebalance on regime and cap breaches, on a written rule.
- A small hedge outside the dominant regime bucket is cheap insurance against a correlated flip.
Practice this in the terminal
FAQ
How many regime buckets should a typical account have?
Two or three is usually enough for most retail-sized accounts: a dominant regime bucket sized to the current market, a smaller opposite-regime bucket for hedges or contrarian trades, and optionally a cash or low-Greek bucket held in reserve for reallocation after a confirmed transition.
Does index diversification help during a market-wide gamma flip?
Not much. Single-name gamma profiles on large tech components tend to move together with the broad index during stress, so treating SPY, QQQ and mega-cap single names as independent diversifiers overstates how protected the portfolio actually is.
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