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 — 40 — is the max pain price.
Open interest by strike · Fri, May 21
■ calls (up)■ puts (down)UBS open contracts per strike for Fri, May 21.
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, May 21
■ calls (up)■ puts (down)Today's traded contracts per strike (delayed).
Implied volatility by strike · Fri, May 21
— call IV— put IVATM ≈ 31.1% · Quoted strikes only; illiquid wings with junk fits are dropped, not smoothed.
Gamma exposure by strike · Fri, May 21
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, May 21
Call Δ
Call Θ
Strike
Γ
Vega
Put Θ
Put Δ
0.93
-0.00
32.5
0.0090
0.05
-0.01
-0.08
0.91
-0.00
35
0.0126
0.06
-0.01
-0.11
0.87
-0.01
37.5
0.0170
0.08
-0.01
-0.15
0.81
-0.01
40
0.0221
0.09
-0.01
-0.20
0.75
-0.01
42.5
0.0274
0.12
-0.01
-0.27
0.67
-0.01
45
0.0321
0.13
-0.01
-0.35
0.59
-0.01
47.5
0.0354
0.14
-0.01
-0.43
0.50
-0.01
50
0.0370
0.14
-0.01
-0.52
0.41
-0.01
52.5
0.0365
0.14
-0.01
-0.61
0.33
-0.01
55
0.0343
0.13
-0.01
-0.69
0.26
-0.01
57.5
0.0308
0.12
-0.01
-0.77
0.20
-0.01
60
0.0266
0.10
-0.01
-0.84
0.11
-0.00
65
0.0180
0.07
-0.01
-0.97
0.06
-0.00
70
0.0111
0.04
-0.00
-1.00
Quoted contract greeks from the delayed feed (not modeled here); the highlighted row is nearest to spot. 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.