Net gamma exposure by strike ($M per 1% move) · estimated from the ARM options chain (Polygon).
These are the 6 strikes carrying the most dealer gamma in ARM right now. The heaviest is 270 at +45.3M per 1% move, 1.9% above spot — that is where hedging flow concentrates, and where price tends to slow down or stall.
| Strike | Net gamma | From spot | Effect |
|---|---|---|---|
| 282.5 | +3.3M | 6.6% | pins price |
| 280 | +11.6M | 5.7% | pins price |
| 275 | +7.3M | 3.8% | pins price |
| 272.5 | +12.8M | 2.9% | pins price |
| 270 | +45.3M | 1.9% | pins price |
| 250 | -2.5M | -5.6% | accelerates moves |
As of the latest session, ARM is trading at $264.90 (+2.83% on the day). Net dealer gamma is negative, with the zero-gamma flip near 267.97. The call wall sits at 270 (upside magnet / resistance) and the put wall at 250 (downside level). Max pain is 250, and the options market is pricing a 1-sigma expected move of about ±6.3% (ATM IV 171%).
ARM is trading below its zero-gamma flip. Spot 264.9 sits −1.16% under 267.97, which puts dealers on the wrong side of their hedges: staying neutral forces them to sell weakness and buy strength. That is the mechanical reason moves in ARM are extending rather than fading right now. Until 267.97 is reclaimed and held, treat every level below as a through-level rather than support.
One strike dominates the map: 270, carrying +$45M per 1% move — above the current price. Positive gamma that size behaves like a wall: rallies into it get sold by hedging flow, and dips toward it get bought.
Options are expensive here: ATM implied volatility is 171%, pricing a 1-sigma move of ±6.3% (±$16.77) into the nearest expiry. At that level you need the move and you need it quickly — long premium bleeds fast, and the structure above argues for spreads over outright calls.
That leaves a working band of 250 to 270 — 7.6% of spot, with +1.93% of room to the call wall and −5.62% down to the put wall. In a positive-gamma tape the edge is fading the edges of that band rather than chasing either end.
Want it interactive? Open ARM on the live gamma map → · see how ARM compares across the whole board on the free market regime tracker · new to this? What is GEX →
ARM is in negative gamma — spot is −1.16% below the 267.97 flip. Dealers amplify moves at these levels, so ARM trends rather than pins, and downside levels behave as through-levels instead of support.
About −1.16%, which is roughly -0.2× the ±6.3% the options are pricing for one session. Under 1× means the flip is reachable in a normal day; over 2× means the regime is unlikely to change without a catalyst. We track this across every major index on the free regime dashboard.
ARM's flip is 267.97, with spot at $264.90. Price is under it, so ARM needs to reclaim 267.97 and hold it to get back into the suppressed regime — roughly -0.2× a single session's expected move away, which is why the level matters more than any moving average on the chart right now.
ARM's call wall (270) is a magnet and resistance; the put wall (250) is support in positive gamma but a through-level once price is below the flip.
250, for the 2026-09-18 expiry — expiring today. Spot is $264.90, so max pain sits 5.6% below the current price. In negative gamma the pull is weak: dealers are amplifying moves, not damping them toward a strike.
About +79M per 1% move into the 2026-09-18 expiry — though spot is below the zero-gamma flip, so hedging at this price runs with the move and adds to it. GEX describes the character of the tape, not the direction. How dealer gamma works →
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Estimated from the ARM options chain (Polygon) · gamma shifts intraday · educational, not financial advice · options carry substantial risk.
