Dealer Positioning Explained: How Market Makers Actually Move Prices

When a trader buys an option, someone must take the other side. That someone is a dealer — and dealers, collectively, hold one of the largest and most consequential books in the market. They are not betting on direction. They are doing something far more mechanical, and far more predictable.

Most retail traders have heard "dealer hedging" invoked to explain everything from pinning to squeezes, and most of what circulates is wrong. Big call open interest is not automatically bullish. Dealers are not "the smart money," and they are almost never "trapped." The real mechanic — the one that determines whether a session compresses or accelerates — follows from what a dealer book actually contains and the one obligation it creates. That mechanic is knowable, and it repeats.

Once you can read that book, session character stops looking random. Why some breakouts fade while others extend, why volatility arrives in specific zones, where the friction points sit before the open — all of it traces back to the same aggregate position. Building that read, step by step, is exactly what the Library curriculum does.

What the Full Lesson Covers

• Who options dealers actually are
• Anatomy of the aggregate dealer book
• The delta-hedging feedback loop
• Long-gamma vs short-gamma regimes
• How dealer books reshape intraday
• Retail-accessible positioning proxies
• Common misreads of dealer behavior
• The regime-first analysis framework