Event risk before this expiration:FOMC decision Wed, Oct 28 · Jobs report Fri, Nov 6 · CPI release Tue, Nov 10 · Jobs report Fri, Dec 4 · FOMC decision Wed, Dec 9 · CPI release Thu, Dec 10 — macro releases historically overwhelm pinning effects; max pain reads weakest in event weeks.
■ put-side pain■ call-side painTotal payout option writers would owe at each settle price (both sides, all open interest, ×100 shares) — low settles hurt put writers, high settles hurt call writers. The minimum — 60 — is the max pain price.
Open interest by strike · Fri, Dec 18
■ calls (up)■ puts (down)ACMR open contracts per strike for Fri, Dec 18.
Open-interest change: building vs unwinding
Needs two observed snapshot days for this expiration; the comparison appears automatically once the next weekday snapshot lands. We diff real observations only; nothing is estimated.
Volume by strike · Fri, Dec 18
■ calls (up)■ puts (down)Today's traded contracts per strike (delayed).
Implied volatility by strike · Fri, Dec 18
— call IV— put IVATM ≈ 83.9% · Quoted strikes only; illiquid wings with junk fits are dropped, not smoothed.
Gamma exposure by strike · Fri, Dec 18
Net dealer gamma per strike, in dollars per 1% move, assuming the standard convention (dealers long calls, short puts) — an assumption, not an observation. Above the amber flip level hedging tends to dampen moves; below it, to amplify them.
Greeks by strike · Fri, Dec 18
Call Δ
Call Θ
Strike
Γ
Vega
Put Θ
Put Δ
0.89
-0.03
35
0.0104
0.04
-0.03
-0.11
0.85
-0.04
37.5
0.0130
0.05
-0.04
-0.15
0.81
-0.04
40
0.0156
0.05
-0.04
-0.19
0.76
-0.05
42.5
0.0180
0.06
-0.05
-0.24
0.71
-0.05
45
0.0202
0.07
-0.05
-0.30
0.65
-0.06
47.5
0.0219
0.07
-0.06
-0.35
0.59
-0.06
50
0.0231
0.08
-0.06
-0.41
0.53
-0.06
52.5
0.0238
0.08
-0.06
-0.47
0.48
-0.06
55
0.0239
0.08
-0.06
-0.53
0.42
-0.06
57.5
0.0235
0.08
-0.06
-0.58
0.37
-0.06
60
0.0228
0.07
-0.06
-0.64
0.33
-0.05
62.5
0.0217
0.07
-0.05
-0.68
0.28
-0.05
65
0.0204
0.07
-0.05
-0.72
0.25
-0.05
67.5
0.0190
0.06
-0.05
-0.76
Quoted contract greeks from the delayed feed (not modeled here); the highlighted row is nearest to spot. Showing 14 strikes around the money — all 20 are in the CSV. Δ per $1 of underlying · Θ per day · vega per IV point.
Stacked — layer the expirations
Call open interest per strike, stacked across the checked expirations — each color is one expiry. Strikes are pruned to the liquid center of each chain.
Max pain is arithmetic, not prophecy: the settle price that would minimize what option writers pay out at expiration, computed from open interest alone. Prices sometimes gravitate toward heavy strikes into expiry — dealer hedging is a real flow — but the evidence that max pain predicts settlement better than chance is mixed, and we are not going to pretend otherwise. Use it as a map of where positioning is stacked, next to the fundamentals and the earnings calendar, not as a target.
Data: Cboe delayed public feed (~15 minutes), refreshed here about every 15 minutes. Open interest itself updates once daily, before the open. Educational information, not investment advice.