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 — 17 — is the max pain price.
Open interest by strike · Fri, Dec 18
■ calls (up)■ puts (down)UNHG 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 ≈ 56.6% · 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
0.91
-0.01
15
0.0238
0.01
-0.01
-0.09
0.88
-0.01
16
0.0304
0.02
-0.01
-0.12
0.85
-0.01
17
0.0386
0.02
-0.01
-0.15
0.80
-0.01
18
0.0480
0.02
-0.01
-0.19
0.75
-0.01
19
0.0580
0.03
-0.01
-0.25
0.68
-0.02
20
0.0674
0.03
-0.02
-0.31
0.61
-0.02
21
0.0744
0.03
-0.02
-0.39
0.53
-0.02
22
0.0780
0.03
-0.02
-0.46
0.46
-0.02
23
0.0779
0.03
-0.02
-0.54
0.39
-0.02
24
0.0747
0.03
-0.02
-0.61
0.33
-0.02
25
0.0694
0.03
-0.02
-0.67
0.27
-0.01
26
0.0630
0.03
-0.02
-0.72
0.23
-0.01
27
0.0564
0.03
-0.01
-0.77
0.19
-0.01
28
0.0499
0.02
-0.01
-0.81
0.16
-0.01
29
0.0439
0.02
-0.01
-0.84
Quoted contract greeks from the delayed feed (not modeled here); the highlighted row is nearest to spot. Showing 15 strikes around the money — all 29 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.