Event risk before this expiration:FOMC decision Wed, Oct 28 · Jobs report Fri, Nov 6 · CPI release Tue, Nov 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 — 38 — is the max pain price.
Open interest by strike · Fri, Nov 20
■ calls (up)■ puts (down)GGAL open contracts per strike for Fri, Nov 20.
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, Nov 20
■ calls (up)■ puts (down)Today's traded contracts per strike (delayed).
Implied volatility by strike · Fri, Nov 20
— call IV— put IVATM ≈ 47.8% · Quoted strikes only; illiquid wings with junk fits are dropped, not smoothed.
Gamma exposure by strike · Fri, Nov 20
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, Nov 20
Call Δ
Call Θ
Strike
Γ
Vega
Put Θ
Put Δ
0.87
-0.02
30
0.0328
0.02
-0.02
-0.13
0.84
-0.02
31
0.0404
0.03
-0.02
-0.16
0.80
-0.02
32
0.0488
0.03
-0.02
-0.20
0.74
-0.03
33
0.0577
0.04
-0.03
-0.26
0.68
-0.03
34
0.0659
0.04
-0.03
-0.32
0.61
-0.03
35
0.0722
0.04
-0.03
-0.39
0.54
-0.03
36
0.0755
0.04
-0.03
-0.47
0.46
-0.03
37
0.0754
0.04
-0.03
-0.54
0.39
-0.03
38
0.0722
0.04
-0.03
-0.61
0.33
-0.03
39
0.0669
0.04
-0.03
-0.67
0.28
-0.03
40
0.0606
0.04
-0.03
-0.73
0.23
-0.03
41
0.0539
0.03
-0.03
-0.77
0.20
-0.02
42
0.0476
0.03
-0.02
-0.81
0.17
-0.02
43
0.0417
0.03
-0.02
-0.84
Quoted contract greeks from the delayed feed (not modeled here); the highlighted row is nearest to spot. Showing 14 strikes around the money — all 19 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.