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 — 380 — is the max pain price.
Open interest by strike · Fri, Oct 23
■ calls (up)■ puts (down)UNH open contracts per strike for Fri, Oct 23.
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 23
■ calls (up)■ puts (down)Today's traded contracts per strike (delayed).
Implied volatility by strike · Fri, Oct 23
— call IV— put IVATM ≈ 49.7% · Quoted strikes only; illiquid wings with junk fits are dropped, not smoothed.
Gamma exposure by strike · Fri, Oct 23
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 23
Call Δ
Call Θ
Strike
Γ
Vega
Put Θ
Put Δ
0.70
-0.47
362.5
0.0093
0.26
-0.47
-0.30
0.67
-0.48
365
0.0097
0.27
-0.48
-0.33
0.65
-0.50
367.5
0.0100
0.28
-0.50
-0.35
0.62
-0.51
370
0.0102
0.28
-0.51
-0.38
0.60
-0.52
372.5
0.0104
0.29
-0.52
-0.40
0.57
-0.53
375
0.0106
0.29
-0.53
-0.43
0.54
-0.53
377.5
0.0107
0.29
-0.53
-0.46
0.52
-0.53
380
0.0107
0.30
-0.54
-0.48
0.49
-0.53
382.5
0.0108
0.30
-0.54
-0.51
0.46
-0.53
385
0.0107
0.29
-0.53
-0.54
0.44
-0.52
387.5
0.0107
0.29
-0.53
-0.56
0.41
-0.52
390
0.0106
0.29
-0.52
-0.59
0.36
-0.49
395
0.0102
0.28
-0.50
-0.64
0.31
-0.46
400
0.0097
0.26
-0.47
-0.69
0.27
-0.43
405
0.0090
0.24
-0.43
-0.74
Quoted contract greeks from the delayed feed (not modeled here); the highlighted row is nearest to spot. Showing 15 strikes around the money — all 44 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.