HowThe settle strike with the smallest total payout to option holders for the 2026-12-18 expiration, over 30 strikes carrying 1,082 open contracts. Open interest is published once a day, before the open, so it describes the previous session.
SourcePut open interest divided by call open interest
As ofCboe delayed snapshot Nov 10, 4:23 PM ET
How262 put contracts / 820 call contracts = 0.32 for the 2026-12-18 expiration. Open interest is published once a day, before the open, so it describes the previous session.
SourceNet gamma exposure from Cboe greeks and open interest
As ofCboe delayed snapshot Nov 10, 4:23 PM ET
HowOver every strike with open interest for the 2026-12-18 expiration: (call gamma × call OI minus put gamma × put OI) × 100 × spot² × 1%, summed. Calls count as positive and puts as negative, a convention about who holds the other side, not a measurement.
Event risk before this expiration: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 — 110 — is the max pain price.
Open interest by strike · Fri, Dec 18
■ calls (up)■ puts (down)ALSN open contracts per strike for Fri, Dec 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, Dec 18
Implied volatility by strike · Fri, Dec 18
— call IV— put IVATM ≈ 34.9% · Quoted strikes only; illiquid wings with junk fits are dropped, not smoothed.
Gamma exposure by strike · Fri, Dec 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, Dec 18
Call Δ
Call Θ
Strike
Γ
Vega
Put Θ
Put Δ
0.96
-0.03
90
0.0040
0.03
-0.03
-0.05
0.94
-0.04
95
0.0056
0.05
-0.04
-0.06
0.92
-0.05
100
0.0077
0.06
-0.04
-0.09
0.89
-0.05
105
0.0106
0.07
-0.05
-0.12
0.84
-0.06
110
0.0144
0.10
-0.06
-0.16
0.77
-0.07
115
0.0194
0.12
-0.07
-0.23
0.66
-0.07
120
0.0245
0.15
-0.07
-0.34
0.53
-0.07
125
0.0276
0.16
-0.07
-0.47
0.40
-0.07
130
0.0265
0.15
-0.07
-0.60
0.29
-0.07
135
0.0225
0.14
-0.07
-0.71
0.21
-0.06
140
0.0180
0.12
-0.06
-0.79
0.16
-0.05
145
0.0141
0.10
-0.05
-0.84
0.12
-0.05
150
0.0111
0.08
-0.04
-0.88
0.10
-0.04
155
0.0088
0.07
-0.04
-0.91
0.08
-0.04
160
0.0070
0.06
-0.03
-0.93
Quoted contract greeks from the delayed feed (not modeled here); the highlighted row is nearest to spot. Showing 15 strikes around the money — all 30 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.
Max pain, walls and gamma print only when an expiration holds at least 100 open contracts across 5 strikes, and max pain also needs to stay within 5% of spot when its single heaviest strike is removed. Below that the expiration reads as thin rather than printing a level one trade could move.
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.