What is Dealer Positioning?
Dealer positioning refers to the aggregate options exposure held by market makers (dealers) and the hedging flows that result from that exposure. Dealers do not choose to be long or short, their positioning is determined by customer demand. The convention every public gamma metric is built on, and the one used throughout this site, is that against index customer flow the dealer is long the calls and short the puts: overwriting and collars sell calls to the desk, and demand for downside protection sells puts to it. A dealer long calls gains delta as price rises and sells the underlying into the rally to stay neutral. A dealer short puts gains delta as price falls and sells the underlying into the decline. Which of the two sides is larger sets the sign on net gamma. Open interest records that a contract exists and never which side a dealer holds, so the convention is a prior rather than a measurement.
Understanding dealer positioning gives you insight into the mechanical flows that will occur as the market moves. These are not discretionary flows based on sentiment, they are mathematically determined by the options Greeks and must happen regardless of the dealer's opinion about market direction.
How to Read Dealer Positioning
Dealer positioning is typically described across several dimensions:
Net gamma exposure: Are dealers long or short gamma overall? Long gamma means they will sell into rallies and buy into dips (stabilizing). Short gamma means they will buy into rallies and sell into dips (destabilizing). This is the most important dimension.
Delta exposure: Are dealers net long or short delta? This tells you whether their hedging has left them with directional exposure. A market maker who has sold a large number of calls and fully hedged with stock has neutral delta but short gamma.
Vanna exposure: How will changes in implied volatility affect dealers' delta and require rehedging? If dealers have large vanna exposure, a sudden shift in IV will trigger significant stock buying or selling.
Charm exposure: How does the passage of time change dealers' delta? Charm flows are predictable day-to-day adjustments that occur even without price movement. They tend to be strongest heading into expiration.
Key Positioning Scenarios
Dealers long gamma, price above GEX flip: This is the calm, low-volatility regime. Expect tight ranges, mean-reverting price action, and subdued VIX. Market makers act as shock absorbers. Selling strategies work well.
Dealers short gamma, price below GEX flip: This is the volatile regime. Expect wide ranges, trending moves, and elevated VIX. Market makers amplify moves. Buying strategies and trend-following work better.
Dealers heavily long calls at one strike (call wall): If the market approaches this level, expect selling pressure from delta hedging, because a long-call position gains delta into the rally and the desk sells the underlying to stay neutral. The call wall acts as resistance unless a strong catalyst pushes through it. Breakouts above the call wall can be powerful as hedging flows reverse.
Dealers heavily short puts at one strike (put wall): A short put carries positive delta that grows as spot falls, so a delta-neutral desk sells into the decline, short-put inventory amplifies a move down rather than cushioning it. The put wall is still worth marking, but for other reasons: once price trades through the strike those puts go deep in the money, gamma collapses, and the mechanical selling simply stops, which on a chart looks much like support appearing.
Vanna and Charm Flows
Beyond basic gamma hedging, sophisticated traders track vanna and charm flows:
Vanna flows at market open: Implied volatility often adjusts at the open based on overnight news and futures moves. Run it through the same short-put book. If IV drops at the open, those put deltas shrink, the short hedge against them is oversized, and the desk buys shares back. If IV rises, put deltas grow and more of the underlying is sold to re-hedge, which compounds a decline. Part of the familiar negative correlation between price and volatility is hedge maintenance rather than sentiment. These flows are often strongest in the first 30-60 minutes of trading.
Charm flows into close: As each trading day passes, options lose a day of time value. This changes delta in predictable ways. An in-the-money contract's delta migrates toward its limit, plus one for a call and minus one for a put, while an out-of-the-money contract's delta migrates toward zero. Which way delta moves is set by where the strike sits against the forward, not by whether the contract is a call or a put: above the forward a call's delta falls toward zero and a put's toward minus one, both falling, and below it both rise. Dealers must adjust their hedges accordingly. These charm-related adjustments tend to create a "drift" in the last 1-2 hours of trading, particularly heading into weekends and expirations.
Practical Framework
Here is a daily checklist for reading dealer positioning:
- Check the GEX flip level relative to the current price. Are you in positive or negative gamma territory?
- Identify the call wall and put wall. The model reads these as the edges of the range the options book is positioned around.
- Note the Swing Line. Is the market in a low-vol or high-vol regime?
- Assess vanna and charm exposure for the day. Are there significant flows expected from time decay or IV shifts?
- Note which regime the model assigns: hedging that leans against moves in positive gamma, hedging that adds to them in negative gamma. That describes the environment, not the next move.
SquawkFlow aggregates dealer positioning data into a single dashboard view, showing GEX levels, walls, and regime indicators in one view.