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 — 195 — is the max pain price.
Open interest by strike · Fri, May 21
■ calls (up)■ puts (down)WDFC 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 ≈ 34.7% · 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
0.94
-0.02
135
0.0016
0.18
-0.02
-0.06
0.87
-0.03
160
0.0032
0.33
-0.03
-0.13
0.78
-0.04
180
0.0049
0.47
-0.04
-0.22
0.76
-0.04
185
0.0054
0.50
-0.04
-0.25
0.73
-0.04
190
0.0058
0.53
-0.05
-0.28
0.69
-0.05
195
0.0062
0.56
-0.05
-0.31
0.66
-0.05
200
0.0065
0.58
-0.05
-0.34
0.59
-0.05
210
0.0071
0.62
-0.05
-0.41
0.45
-0.05
230
0.0076
0.63
-0.05
-0.56
0.38
-0.05
240
0.0074
0.61
-0.05
-0.64
0.31
-0.04
250
0.0070
0.56
-0.04
-0.70
0.25
-0.04
260
0.0064
0.51
-0.04
-0.77
0.20
-0.03
270
0.0056
0.46
-0.04
-0.82
0.16
-0.03
280
0.0049
0.40
-0.03
-0.88
Quoted contract greeks from the delayed feed (not modeled here); the highlighted row is nearest to spot. Showing 14 strikes around the money — all 16 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.