Net gamma exposure by strike ($M per 1% move) · estimated from the WDC options chain (Polygon).
These are the 6 strikes carrying the most dealer gamma in WDC right now. The heaviest is 410 at -4.3M per 1% move, 3.8% below spot — that is where hedging flow concentrates, and where price tends to slow down or stall.
| Strike | Net gamma | From spot | Effect |
|---|---|---|---|
| 425 | +2.5M | -0.2% | pins price |
| 420 | -2.9M | -1.4% | accelerates moves |
| 415 | -2.2M | -2.6% | accelerates moves |
| 410 | -4.3M | -3.8% | accelerates moves |
| 400 | -3.1M | -6.1% | accelerates moves |
| 390 | -0.8M | -8.5% | accelerates moves |
As of the latest session, WDC is trading at $426.00 (+0.56% on the day). Net dealer gamma is negative, with the zero-gamma flip near —. The call wall sits at 425 (upside magnet / resistance) and the put wall at 410 (downside level). Max pain is 430, and the options market is pricing a 1-sigma expected move of about ±2.9% (ATM IV 77%).
The book leans mildly upward: +$4M of positive gamma above spot versus +$3M below, a 1.4-to-1 tilt. Enough to bias drift toward 425, not enough to call it a magnet.
One strike dominates the map: 410, carrying −$4M per 1% move — below the current price. Negative gamma that size behaves like an accelerant — dealers chase price through it rather than defending it.
Options are expensive here: ATM implied volatility is 77%, pricing a 1-sigma move of ±2.9% (±$12.16) 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.
Note that WDC has already traded through its call wall at 425 (−0.23% away). Past the wall, that positive gamma stops acting as a magnet and starts acting as a cap — the pull that carried price here is now the thing resisting it. The 410–425 band spans 3.5% of spot.
Want it interactive? Open WDC on the live gamma map → · see how WDC compares across the whole board on the free market regime tracker · new to this? What is GEX →
WDC is in positive gamma with — of room above the null flip. Dealers are damping moves, so expect a mean-reverting tape that pulls back toward the heavy strikes.
WDC's flip isn't resolvable from the current chain — check the live map for today's level.
WDC's flip is not resolvable from the current chain. Pull it live on the free map — the level moves with open interest, so a stale number is worse than none.
WDC's call wall (425) is a magnet and resistance; the put wall (410) is support in positive gamma but a through-level once price is below the flip.
430, for the 2026-09-18 expiry — expiring today. Spot is $426.00, so max pain sits 0.9% above the current price. In negative gamma the pull is weak: dealers are amplifying moves, not damping them toward a strike.
About -15M 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 →
The flip, walls and max pain before the open — free. No card required.
Also see the flow side: WDC options flow →
Posting the link is enough — X, Discord and Slack render the live data card automatically.
Live WDC dealer gamma, updates itself. No signup, no API key. Copy and paste:
Keep the credit line — it's the only thing we ask for.
This is the free auto-read. Premium members get the daily SPY gamma drop — the map turned into a scenario-by-scenario trading plan — plus the live conviction desk and AI copilot.
Estimated from the WDC options chain (Polygon) · gamma shifts intraday · educational, not financial advice · options carry substantial risk.
