SourcePut open interest divided by call open interest
As ofCboe delayed snapshot Nov 10, 7:05 PM ET
How1,123 put contracts / 657 call contracts = 1.71 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 10, 7:05 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.
Max pain is not shown: without its single heaviest strike it moves 19.5% of spot, more than the 5% we allow, so one strike decides it. Walls and gamma still print.
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.
Max pain is not shown: without its single heaviest strike it moves 19.5% of spot, more than the 5% we allow, so one strike decides it. Walls and gamma still print.
Open interest by strike · Fri, May 21
■ calls (up)■ puts (down)ROL 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
Implied volatility by strike · Fri, May 21
— call IV— put IVATM ≈ 35.6% · 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
0.97
not quoted
20
0.0041
0.02
-0.00
-0.03
0.96
not quoted
22.5
0.0066
0.02
-0.00
-0.04
0.94
-0.00
25
0.0100
0.03
-0.00
-0.07
0.90
-0.00
27.5
0.0147
0.05
-0.01
-0.10
0.85
-0.00
30
0.0208
0.06
-0.01
-0.15
0.79
-0.01
32.5
0.0280
0.08
-0.01
-0.21
0.71
-0.01
35
0.0354
0.09
-0.01
-0.30
0.61
-0.01
37.5
0.0415
0.10
-0.01
-0.40
0.50
-0.01
40
0.0447
0.11
-0.01
-0.51
0.40
-0.01
42.5
0.0440
0.11
-0.01
-0.62
0.30
-0.01
45
0.0401
0.10
-0.01
-0.71
Quoted contract greeks from the delayed feed (not modeled here); the highlighted row is nearest to spot. Showing 11 strikes around the money — all 12 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.