Most traders watch the market open like hawks, but it’s often the final hour that decides the real story. Last week showed how late-session positioning can completely change how a trading day finishes — and how gamma levels can help spot those shifts before they happen.
Why the Last Hour Matters
Market makers and institutions adjust risk as the close approaches. This isn’t random — it’s about balancing exposure before the day ends. When gamma exposure shifts late, it can turn a quiet day into a sharp rally or a fast drop.
That’s exactly what happened in SPY this particular week, where prices hovered within forecasted gamma ranges most of the day before breaking toward new levels in the final 60 minutes.
These late moves aren’t about manipulation — they’re about hedging. If institutions need to buy or sell significant volume to stay neutral, their actions can accelerate price moves into the close.
Spotting the Shift Before It Hits
Gamma levels act like a map of potential turning points. This particular week, forecasts were within about $1 to $1.50 of actual SPY closes — close enough to trade effectively. The key is watching whether price moves toward or away from high gamma zones during the day.
If it pushes through and holds, especially in the afternoon, odds rise that end-of-day positioning will reinforce that move.
For traders, the takeaway is simple…
Don’t tune out after lunch. The last hour can bring decisive, tradable moves that either confirm or completely reverse earlier trends. If you’re using gamma as part of your strategy, those late shifts may be the signal that locks in the trade.
Kane Shieh
Kane Shieh Trading
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*This is for informational and educational purposes only. There is inherent risk in trading, so trade at your own risk.
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