DEX & the dealer's hedge book
Every dollar of DEX has a stock hedge sitting against it.
DEX is not just a picture of the crowd's bets — it is a map of the stock dealers are holding against those bets. A dealer who sold the calls behind a big positive-DEX strike is long stock against them; a dealer short the puts behind a negative-DEX strike is short stock against those.
Why the hedge matters more than the bet
- The options crowd can be wrong quietly. The hedges against their positions are real shares that must be bought and sold in the open market.
- When options decay, expire, or get closed, the hedges unwind — releasing that stock supply or demand back into the tape.
- The bigger the DEX at a strike, the bigger the unwind when it rolls off. Large-DEX strikes act like scheduled liquidity events.
DEX is stock, eventually
Read a big DEX bar as future stock flow with a timer on it: the delta notional parked at that strike will re-enter the market as hedges adjust and expire. GEX tells you how fast that adjustment accelerates; DEX tells you how much is parked.