BIIB· Biogen
Open interest · contracts by strike
Spot
216.1
Max Pain
200
Call OI
1,361
Put OI
124
P/C ratio
0.09
Open interest by strike (contracts)
Call OIPut OISpot / max pain
Max pain 200
Spot 216.1
245
240
235
230
227.5
225
652
Call OI
222.5
30
220
462
217.5
215
212.5
36
210
49
207.5
205
202.5
200
Max pain
197.5
195
192.5
190
187.5
185
27
Put OI
Open interest by strike with the max-pain level marked, per expiry — heuristics over CBOE delayed chains, same strike band as the GEX profile.