Event risk before this expiration:CPI release Wed, Oct 14 — 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 — 387.5 — is the max pain price.
Open interest by strike · Fri, Oct 16
■ calls (up)■ puts (down)UNH open contracts per strike for Fri, Oct 16.
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, Oct 16
■ calls (up)■ puts (down)Today's traded contracts per strike (delayed).
Implied volatility by strike · Fri, Oct 16
— call IV— put IVATM ≈ 65.3% · Quoted strikes only; illiquid wings with junk fits are dropped, not smoothed.
Gamma exposure by strike · Fri, Oct 16
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, Oct 16
Call Δ
Call Θ
Strike
Γ
Vega
Put Θ
Put Δ
0.71
-0.85
362.5
0.0100
0.18
-0.85
-0.29
0.69
-0.89
365
0.0104
0.19
-0.89
-0.32
0.66
-0.92
367.5
0.0107
0.19
-0.92
-0.34
0.63
-0.95
370
0.0111
0.20
-0.95
-0.37
0.60
-0.97
372.5
0.0113
0.20
-0.97
-0.40
0.57
-0.99
375
0.0115
0.21
-0.99
-0.43
0.54
-1.00
377.5
0.0116
0.21
-1.00
-0.46
0.51
-1.00
380
0.0117
0.21
-1.00
-0.49
0.48
-1.00
382.5
0.0117
0.21
-1.00
-0.52
0.46
-0.99
385
0.0117
0.21
-0.99
-0.55
0.43
-0.98
387.5
0.0116
0.21
-0.98
-0.57
0.40
-0.96
390
0.0114
0.20
-0.96
-0.60
0.37
-0.93
392.5
0.0112
0.20
-0.94
-0.63
0.34
-0.90
395
0.0109
0.19
-0.91
-0.66
0.32
-0.87
397.5
0.0106
0.19
-0.87
-0.68
Quoted contract greeks from the delayed feed (not modeled here); the highlighted row is nearest to spot. Showing 15 strikes around the money — all 52 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.