BIIB· Biogen
Open interest · contracts by strike
Spot
217.2
Max Pain
200
Call OI
4,485
Put OI
3,683
P/C ratio
0.82
Open interest by strike (contracts)
Call OIPut OISpot / max pain
Max pain 200
Spot 217.2
245
242.5
240
614
237.5
235
85
232.5
230
688
227.5
225
54
222.5
220
238
753
217.5
215
212.5
210
187
864
207.5
205
202.5
200
755
974
Call OI
197.5
195
798
207
192.5
190
1,280
79
Put OI
187.5
185
314
Open interest by strike with the max-pain level marked, per expiry — heuristics over CBOE delayed chains, same strike band as the GEX profile.
History
BIIB open interest, night by night.
Total call and put contracts held on each recorded session — the level the strike profile above is a snapshot of.
10 Jun → 11 Sep
OI totals over time
Contracts outstanding, summed over the whole captured chain — every listed expiry and strike, wider than the strike band and single expiry shown in the profile above.
call OI, contractsput OI, contracts
One reading per session, captured nightly after the close, 10 Jun → 11 Sep, over CBOE delayed (~15-min) chains, computed across the full listed chain. Gaps are weekends, holidays and sessions a capture missed; any reading can be absent on a session that was captured, and the series is broken rather than drawn through it.