■ 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 — 440 — is the max pain price.
Open interest by strike · Fri, Sep 18
■ calls (up)■ puts (down)WDC open contracts per strike for Fri, Sep 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, Sep 18
■ calls (up)■ puts (down)Today's traded contracts per strike (delayed).
Implied volatility by strike · Fri, Sep 18
— call IV— put IVATM ≈ 67.3% · Quoted strikes only; illiquid wings with junk fits are dropped, not smoothed.
Gamma exposure by strike · Fri, Sep 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, Sep 18
Call Δ
Call Θ
Strike
Γ
Vega
Put Θ
Put Δ
0.92
-0.41
400
0.0030
0.10
-0.43
-0.08
0.88
-0.55
410
0.0041
0.13
-0.56
-0.12
0.84
-0.70
420
0.0053
0.17
-0.72
-0.16
0.81
-0.78
425
0.0059
0.19
-0.80
-0.19
0.77
-0.86
430
0.0065
0.21
-0.88
-0.23
0.70
-1.01
440
0.0075
0.24
-1.02
-0.30
0.62
-1.11
450
0.0083
0.26
-1.12
-0.38
0.53
-1.17
460
0.0086
0.27
-1.17
-0.47
0.49
-1.17
465
0.0087
0.27
-1.18
-0.51
0.45
-1.16
470
0.0086
0.27
-1.17
-0.55
0.39
-1.13
477.5
0.0083
0.26
-1.13
-0.61
0.37
-1.11
480
0.0081
0.26
-1.11
-0.64
0.29
-1.01
490
0.0074
0.24
-1.01
-0.71
0.23
-0.89
500
0.0065
0.21
-0.88
-0.77
0.18
-0.75
510
0.0055
0.18
-0.74
-0.82
Quoted contract greeks from the delayed feed (not modeled here); the highlighted row is nearest to spot. Showing 15 strikes around the money — all 60 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.