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Dealer Flow
Why Gamma Matters More for 0DTE
Gamma matters on any option, but on 0DTE it's the whole story. The most concentrated gamma in the market sits in same-day contracts — and it shows.
NoVo Options Trading · 2026
Gamma is highest for at-the-money options nearest to expiration — which means 0DTE options carry the most concentrated gamma in the entire market. That single fact explains most of what makes same-day trading feel the way it does.
Concentrated gamma, intense hedging
Because 0DTE gamma is so concentrated, dealer hedging around same-day strikes is unusually intense — small moves in SPY force large, rapid hedging adjustments (how dealer hedging moves price). The huge daily volume in 0DTE options amplifies this further. The result is that dealer flow has an outsized grip on intraday price near those strikes.
Pins by day, fireworks by close
In a positive-gamma setup, this pins price hard to big 0DTE strikes — the market coils near a level for hours (gamma walls). But as expiration nears and gamma peaks into the afternoon, the hedging gets more violent, and in a negative-gamma regime the close can accelerate into a fast directional move (power hour).
On 0DTE, you're not just trading SPY — you're trading the dealer hedging that same-day gamma forces. Ignore it and the tape will feel random.
Why it's NoVo's edge
This is the core reason NoVo trades SPY, QQQ and IWM 0/1-DTE through a gamma lens: near the gamma-flip level, dealer positioning gives directional moves a real, measurable tilt (the gamma flip, positive vs negative gamma). It's also why the read gets less reliable far from the flip. See 0DTE trading.
More on this: IV vs HV for a Day Trader: Which One Matters More
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NoVo is a software tool for market analysis and for executing trades you initiate, not financial advice. This article is general education, not investment advice. Options trading involves substantial risk of loss, up to and including your entire capital. NoVo makes no guarantee of profit, win rate, or performance, and past results do not predict future outcomes. You are responsible for your own broker account, configuration, and trading decisions.