HowThe settle strike with the smallest total payout to option holders for the 2027-05-21 expiration, over 27 strikes carrying 206 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 8, 8:26 PM ET
How120 put contracts / 86 call contracts = 1.40 for the 2027-05-21 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 8, 8:26 PM ET
HowOver every strike with open interest for the 2027-05-21 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: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 — 1040 — is the max pain price.
Open interest by strike · Fri, May 21
■ calls (up)■ puts (down)COST 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 ≈ 23.9% · 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
0.75
-0.15
970
0.0017
2.46
-0.16
-0.26
0.73
-0.15
980
0.0017
2.55
-0.17
-0.28
0.71
-0.16
990
0.0018
2.63
-0.17
-0.30
0.70
-0.16
1000
0.0019
2.71
-0.18
-0.32
0.68
-0.17
1010
0.0019
2.78
-0.18
-0.34
0.66
-0.17
1020
0.0020
2.84
-0.18
-0.36
0.62
-0.18
1040
0.0021
2.95
-0.19
-0.40
0.60
-0.18
1050
0.0021
2.99
-0.20
-0.42
0.57
-0.18
1060
0.0021
3.02
-0.20
-0.45
0.53
-0.18
1080
0.0022
3.06
-0.20
-0.49
0.49
-0.18
1100
0.0022
3.08
-0.20
-0.54
0.47
-0.18
1110
0.0022
3.07
-0.20
-0.56
0.45
-0.18
1120
0.0022
3.05
-0.20
-0.59
0.41
-0.18
1140
0.0021
3.00
-0.20
-0.64
0.39
-0.17
1150
0.0021
2.96
-0.20
-0.66
Quoted contract greeks from the delayed feed (not modeled here); the highlighted row is nearest to spot. Showing 15 strikes around the money — all 27 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.