Event risk before this expiration: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 — 54 — is the max pain price.
Open interest by strike · Fri, Jan 21
■ calls (up)■ puts (down)SPYI open contracts per strike for Fri, Jan 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, Jan 21
■ calls (up)■ puts (down)Today's traded contracts per strike (delayed).
Implied volatility by strike · Fri, Jan 21
— call IV— put IVATM ≈ 10.5% · Quoted strikes only; illiquid wings with junk fits are dropped, not smoothed.
Gamma exposure by strike · Fri, Jan 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, Jan 21
Call Δ
Call Θ
Strike
Γ
Vega
Put Θ
Put Δ
1.00
—
35
0.0136
0.10
-0.00
-0.12
1.00
—
40
0.0235
0.14
-0.00
-0.18
1.00
—
45
0.0011
0.00
-0.00
-0.30
1.00
—
47
0.0065
0.00
-0.00
-0.38
0.94
-0.00
50
0.0712
0.04
-0.00
-0.56
0.85
-0.00
51
0.1369
0.09
-0.00
-0.64
0.68
-0.01
52
0.1819
0.14
-0.00
-0.70
0.50
-0.01
53
0.1615
0.16
-0.00
-0.75
0.37
-0.00
54
0.1166
0.16
-0.00
-0.80
0.28
-0.00
55
0.0838
0.16
-0.00
-0.83
0.22
-0.00
56
0.0640
0.14
0.00
-0.85
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.