Cross-Market Gamma Analysis
Equity index gamma is spread across several venues and products. Looking at one in isolation gives an incomplete picture; comparing them gives you a confidence score for the level you are about to trade.
Normalising across products
SPX, SPY and /ES track the same underlying with different multipliers and strike spacing. Convert every profile to index points and to notional dollars before comparing, otherwise SPY's 1-point strikes look denser than they economically are.
Agreement is a confidence score
When the SPX flip, the SPY flip and the /ES flip cluster within a few index points, the level is robust and worth trading aggressively. When they scatter, the estimate is fragile — size down and demand more confirmation.
- Cluster within ~0.15% of spot: high-confidence level.
- Scattered flips: reduce size and widen stops, or stand aside.
- Futures gamma leads in overnight sessions when the cash chains are closed.
QQQ vs SPY divergence
A negative-gamma QQQ with a positive-gamma SPY typically means tech-specific flow is driving the tape. Expect trend behaviour in NDX names and mean reversion in the broad index — trade each with its own playbook rather than averaging them.
Overnight and session handoff
Use /ES gamma to frame the overnight range, then re-anchor to cash profiles at the open. The most common cross-market trap is carrying an overnight futures level into a cash session that has repriced its entire chain.
Key takeaways
- Normalise to index points and notional before comparing products.
- Clustered flip levels mean high confidence; scattered ones mean stand down.
- Futures lead overnight; cash chains take over at the open.
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Educational content only. Options involve substantial risk and are not suitable for every investor. Nothing here is financial advice.