Event risk before this expiration:Jobs report Fri, Aug 7 · CPI release Wed, Aug 12 — 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 — 12.5 — is the max pain price.
Open interest by strike · Fri, Aug 21
■ calls (up)■ puts (down)XNDU open contracts per strike for Fri, Aug 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, Aug 21
■ calls (up)■ puts (down)Today's traded contracts per strike (delayed).
Implied volatility by strike · Fri, Aug 21
— call IV— put IVATM ≈ 154.6% · Quoted strikes only; illiquid wings with junk fits are dropped, not smoothed.
Gamma exposure by strike · Fri, Aug 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, Aug 21
Call Δ
Call Θ
Strike
Γ
Vega
Put Θ
Put Δ
0.88
-0.02
8
0.0547
0.01
-0.02
-0.12
0.85
-0.02
8.5
0.0669
0.01
-0.02
-0.15
0.81
-0.03
9
0.0807
0.01
-0.03
-0.19
0.76
-0.03
9.5
0.0951
0.01
-0.03
-0.24
0.71
-0.03
10
0.1088
0.01
-0.03
-0.29
0.65
-0.03
10.5
0.1200
0.01
-0.03
-0.35
0.58
-0.03
11
0.1271
0.01
-0.03
-0.41
0.52
-0.03
11.5
0.1293
0.01
-0.03
-0.48
0.46
-0.03
12
0.1272
0.01
-0.03
-0.54
0.40
-0.03
12.5
0.1219
0.01
-0.03
-0.59
0.35
-0.03
13
0.1148
0.01
-0.03
-0.64
0.28
-0.03
14
0.0986
0.01
-0.03
-0.71
0.25
-0.03
14.5
0.0908
0.01
-0.03
-0.74
0.22
-0.03
15
0.0834
0.01
-0.03
-0.77
0.15
-0.02
17
0.0596
0.01
-0.02
-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 21 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.