core · Lesson 2
The Dealer Hedging Engine
Why dealers move price even when they don't want to. · 5 min read
To understand Helios you have to understand one thing: market makers don't take directional risk if they can help it. When a retail trader buys a call, the dealer sells it. To stay flat, the dealer immediately hedges the delta — by buying the underlying.
Why this drives the tape
Every time price moves, the delta of every option in the dealer's book changes. To stay delta-neutral, dealers must continuously buy and sell the underlying. This mechanical buying and selling is one of the dominant forces in intraday SPX/SPY/QQQ price action.
Long-gamma vs short-gamma dealers
- When dealers are long gamma, their hedging is counter-trend — they sell rallies, buy dips. That stabilizes price.
- When dealers are short gamma, their hedging is pro-trend — they buy rallies, sell dips. That accelerates price.
The same setup that looks like calm in a long-gamma regime can look like a meltdown in a short-gamma regime. The regime is the lens.
Got a follow-up?
Ask Helios anything about this lesson — it knows your tier and current dashboard state.