Net gamma exposure by strike ($M per 1% move) · estimated from the MRK options chain (Polygon).
As of the latest session, MRK is trading at $129.44 (-0.71% on the day). Net dealer gamma is positive, with the zero-gamma flip near 135.75. The call wall sits at 132 (upside magnet / resistance) and the put wall at 130 (downside level). Max pain is 128, and the options market is pricing a 1-sigma expected move of about ±1.8% (ATM IV 50%).
MRK is in positive gamma. Dealers are net long gamma — they sell strength and buy weakness, which compresses volatility and pulls price toward the big strikes. Expect a grindy, mean-reverting tape that wants to pin near 128. The edge is fading the extremes of the 130–132 band — until 135.75 gives way to the downside.
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MRK is currently in positive gamma, with the zero-gamma flip near 135.75. Positive gamma means dealers dampen moves — a calmer, mean-reverting, pin-toward-the-strikes tape.
MRK's zero-gamma flip is around 135.75 — the price where net dealer gamma crosses zero. Above it the tape tends to be positive-gamma (suppressed, range-bound); below it, negative-gamma (amplified, trending). Reclaiming or losing the flip is the single most important level on the map.
MRK's call wall (132) is a magnet and resistance; the put wall (130) is support in positive gamma but a through-level once price is below the flip.
MRK's max pain is 128 — the strike where the most options expire worthless. In a positive-gamma tape, price often gets drawn toward max pain into expiration.
Gamma exposure is a map of where option dealers are forced to hedge. Positive GEX = dealers sell strength / buy weakness (suppresses volatility, pins price). Negative GEX = dealers chase the move (amplifies volatility, trends). It tells you the character of the tape, not the direction. Full GEX guide →
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Estimated from the MRK options chain (Polygon) · gamma shifts intraday · educational, not financial advice · options carry substantial risk.
