BIIB Options Open Interest by Strike, Oct 21 Settlement
BIIB open interest settled 2026-10-21 vs 2026-10-20.
Source: SquawkFlow's archive of settled open interest. Counts are contracts, not trades; they do not identify which side opened or closed a position.
Computed from the Oct 21 settlement. Next update after the Oct 22 settlement, after 5:30 a.m. PT (8:30 a.m. ET) on Friday, Oct 23, 2026.
All archived unexpired expiration/strike/type keys, including unchanged counts. Series sharing that key are combined; roots and deliverables are not retained. Zero-OI keys omitted by the archive are not reconstructed.
This page shows the 6 nearest of 14 expirations, with the 40 strikes nearest the archived reference price (2026-10-21) for each, plus the largest changes across the whole book. The complete book, 601 expiration/strike/type keys, is in the Markdown table.
Strike bucket on the horizontal axis, settled open contracts per bucket on the vertical axis. Calls in the accent color; puts in orange. Totals across the 6 nearest expirations, strikes from 193 to 289. Source: SquawkFlow's archive of settled open interest. Counts are contracts, not trades; they do not identify which side opened or closed a position.
BIIB: largest changes in the full book, settled 2026-10-21 vs 2026-10-20
Strike
Expiry
Type
Prior OI
Settled OI
Change
230
12/18
put
836
1,331
+495
240
12/18
call
664
1,155
+491
245
12/18
call
630
1,083
+453
235
12/18
put
5
353
+348
265
10/23
call
115
389
+274
220
03/19
put
23
227
+204
210
10/30
put
24
185
+161
250
01/15
call
855
958
+103
250
06/17
put
0
89
+89
290
06/17
call
2
90
+88
260
11/20
call
177
236
+59
300
01/15
call
748
787
+39
250
11/20
call
158
124
-34
240
10/30
put
4
35
+31
240
11/13
put
0
26
+26
Expiration 2026-10-23
BIIB open interest, settled 2026-10-21, expiration 2026-10-23, strikes 120 to 270
Strike
Expiry
Type
Prior OI
Settled OI
Change
120
10/23
put
1
1
0
185
10/23
put
1
1
0
200
10/23
put
7
7
0
202.5
10/23
put
53
53
0
207.5
10/23
put
6
6
0
210
10/23
call
2
2
0
210
10/23
put
12
12
0
212.5
10/23
put
6
6
0
215
10/23
call
7
7
0
215
10/23
put
309
309
0
217.5
10/23
call
1
1
0
220
10/23
call
208
208
0
220
10/23
put
764
764
0
222.5
10/23
call
1
1
0
222.5
10/23
put
7
7
0
225
10/23
call
210
209
-1
225
10/23
put
54
54
0
227.5
10/23
call
4
4
0
227.5
10/23
put
4
3
-1
230
10/23
call
411
411
0
230
10/23
put
532
522
-10
232.5
10/23
call
14
14
0
232.5
10/23
put
253
275
+22
235
10/23
call
32
32
0
235
10/23
put
21
21
0
237.5
10/23
call
10
10
0
237.5
10/23
put
0
1
+1
240
10/23
call
297
294
-3
240
10/23
put
5
12
+7
242.5
10/23
call
10
16
+6
242.5
10/23
put
2
3
+1
245
10/23
call
80
79
-1
245
10/23
put
1
1
0
247.5
10/23
call
15
23
+8
250
10/23
call
68
71
+3
252.5
10/23
call
3
5
+2
255
10/23
call
2
3
+1
257.5
10/23
call
1
1
0
257.5
10/23
put
0
2
+2
260
10/23
call
42
48
+6
265
10/23
call
115
389
+274
270
10/23
call
1
1
0
Expiration 2026-10-30
BIIB open interest, settled 2026-10-21, expiration 2026-10-30, strikes 180 to 300
Strike
Expiry
Type
Prior OI
Settled OI
Change
180
10/30
call
2
2
0
180
10/30
put
1
1
0
185
10/30
put
2
2
0
190
10/30
put
39
39
0
195
10/30
call
1
1
0
195
10/30
put
1
1
0
200
10/30
put
18
18
0
202.5
10/30
put
4
4
0
205
10/30
put
23
23
0
210
10/30
call
4
4
0
210
10/30
put
24
185
+161
215
10/30
call
1
1
0
215
10/30
put
245
244
-1
217.5
10/30
put
1
1
0
220
10/30
call
36
39
+3
220
10/30
put
30
30
0
222.5
10/30
put
1
1
0
225
10/30
call
54
54
0
225
10/30
put
57
57
0
227.5
10/30
call
1
1
0
227.5
10/30
put
5
4
-1
230
10/30
call
21
21
0
230
10/30
put
12
13
+1
232.5
10/30
call
10
10
0
232.5
10/30
put
2
2
0
235
10/30
call
23
23
0
235
10/30
put
1
18
+17
237.5
10/30
call
1
4
+3
237.5
10/30
put
4
5
+1
240
10/30
call
318
317
-1
240
10/30
put
4
35
+31
242.5
10/30
call
4
3
-1
245
10/30
call
15
16
+1
250
10/30
call
8
13
+5
255
10/30
call
17
19
+2
255
10/30
put
1
1
0
260
10/30
call
1
1
0
265
10/30
call
1
0
-1
270
10/30
call
0
2
+2
275
10/30
call
5
6
+1
290
10/30
call
1
1
0
295
10/30
call
2
2
0
300
10/30
call
1
1
0
Expiration 2026-11-06
BIIB open interest, settled 2026-10-21, expiration 2026-11-06, strikes 185 to 285
Strike
Expiry
Type
Prior OI
Settled OI
Change
185
11/06
put
1
1
0
200
11/06
put
11
11
0
205
11/06
put
14
14
0
210
11/06
put
1
0
-1
215
11/06
put
4
4
0
220
11/06
call
37
37
0
220
11/06
put
9
9
0
225
11/06
call
261
260
-1
225
11/06
put
8
8
0
230
11/06
call
105
104
-1
230
11/06
put
3
3
0
235
11/06
call
146
145
-1
235
11/06
put
9
9
0
240
11/06
call
26
26
0
242.5
11/06
call
0
1
+1
245
11/06
call
7
11
+4
250
11/06
call
5
5
0
252.5
11/06
call
0
1
+1
255
11/06
call
10
10
0
260
11/06
call
2
3
+1
265
11/06
call
4
4
0
270
11/06
call
1
2
+1
285
11/06
call
0
1
+1
Expiration 2026-11-13
BIIB open interest, settled 2026-10-21, expiration 2026-11-13, strikes 115 to 295
Strike
Expiry
Type
Prior OI
Settled OI
Change
115
11/13
put
1
1
0
190
11/13
put
3
1
-2
195
11/13
put
84
73
-11
200
11/13
put
9
1
-8
205
11/13
put
2
2
0
210
11/13
put
6
5
-1
220
11/13
put
0
6
+6
225
11/13
call
1
1
0
225
11/13
put
7
7
0
230
11/13
call
8
1
-7
230
11/13
put
7
7
0
235
11/13
call
10
28
+18
235
11/13
put
11
11
0
240
11/13
call
2
3
+1
240
11/13
put
0
26
+26
245
11/13
call
4
4
0
250
11/13
call
0
3
+3
260
11/13
call
1
1
0
265
11/13
call
0
7
+7
295
11/13
call
1
1
0
Expiration 2026-11-20
BIIB open interest, settled 2026-10-21, expiration 2026-11-20, strikes 115 to 320
Strike
Expiry
Type
Prior OI
Settled OI
Change
115
11/20
put
7
7
0
130
11/20
call
1
1
0
160
11/20
put
2
2
0
165
11/20
put
15
15
0
170
11/20
put
3
3
0
175
11/20
put
3
3
0
180
11/20
put
12
12
0
185
11/20
put
10
10
0
190
11/20
call
450
450
0
190
11/20
put
6
6
0
195
11/20
put
101
101
0
200
11/20
call
7
7
0
200
11/20
put
35
35
0
210
11/20
call
4
5
+1
210
11/20
put
233
233
0
215
11/20
put
1
1
0
220
11/20
call
30
30
0
220
11/20
put
18
17
-1
230
11/20
call
130
130
0
230
11/20
put
23
25
+2
235
11/20
call
1
2
+1
235
11/20
put
10
10
0
240
11/20
call
352
347
-5
240
11/20
put
2
3
+1
242.5
11/20
call
0
1
+1
245
11/20
call
40
43
+3
247.5
11/20
call
0
1
+1
250
11/20
call
158
124
-34
255
11/20
call
6
6
0
260
11/20
call
177
236
+59
265
11/20
call
2
2
0
270
11/20
call
15
15
0
270
11/20
put
1
1
0
280
11/20
call
19
20
+1
280
11/20
put
1
6
+5
290
11/20
call
0
4
+4
300
11/20
call
4
4
0
320
11/20
call
1
1
0
Expiration 2026-11-27
BIIB open interest, settled 2026-10-21, expiration 2026-11-27, strikes 145 to 265
Strike
Expiry
Type
Prior OI
Settled OI
Change
145
11/27
put
1
1
0
195
11/27
put
1
1
0
200
11/27
put
1
1
0
205
11/27
put
1
1
0
210
11/27
put
1
1
0
215
11/27
put
1
1
0
220
11/27
put
1
1
0
230
11/27
call
2
2
0
235
11/27
call
5
5
0
240
11/27
call
1
1
0
250
11/27
call
1
1
0
255
11/27
call
2
2
0
260
11/27
call
1
1
0
265
11/27
call
0
1
+1
Later expirations (2026-12-18, 2027-01-15, 2027-03-19, 2027-04-16, 2027-06-17, 2027-09-17, 2028-01-21, 2029-01-19) and all other strikes are in the Markdown table.