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 — 450 — is the max pain price.
Open interest by strike · Fri, Nov 20
■ calls (up)■ puts (down)HCA 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 ≈ 37.3% · 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
0.78
-0.23
420
0.0056
0.40
-0.24
-0.22
0.76
-0.25
425
0.0060
0.43
-0.26
-0.25
0.72
-0.26
430
0.0065
0.45
-0.27
-0.28
0.69
-0.28
435
0.0069
0.48
-0.28
-0.31
0.65
-0.29
440
0.0073
0.50
-0.29
-0.35
0.61
-0.30
445
0.0076
0.52
-0.30
-0.39
0.58
-0.30
450
0.0078
0.53
-0.31
-0.43
0.54
-0.31
455
0.0079
0.54
-0.31
-0.47
0.50
-0.31
460
0.0080
0.54
-0.31
-0.51
0.46
-0.31
465
0.0080
0.54
-0.31
-0.55
0.42
-0.30
470
0.0079
0.53
-0.30
-0.59
0.38
-0.29
475
0.0077
0.52
-0.30
-0.63
0.35
-0.28
480
0.0074
0.50
-0.29
-0.66
0.31
-0.27
485
0.0071
0.48
-0.28
-0.70
0.28
-0.26
490
0.0068
0.46
-0.26
-0.73
Quoted contract greeks from the delayed feed (not modeled here); the highlighted row is nearest to spot. Showing 15 strikes around the money — all 45 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.