Position in BIIB
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$494,993
+$185,349 QoQ
Shares Held
2,291
+35.6% QoQ
Ownership
0.002%
of shares outstanding
% of Portfolio
0.02%
of 13F equity value
Holder Rank
#575
of 1,036 holders
Holding Since
Mar 2020
22 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in BIIB Over Time
Shares Held
Position Value (USD)
Derivatives in BIIB
reported options exposure · as of Sep 30, 2025CallValue
$1,050,600
CallShares
7,500
PutValue
$0
PutShares
0
Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.
Position in Drug Manufacturers - General
Healthcare · as of Jun 30, 2026Parallax Volatility Advisers, L.P. holds $35,775,129 across 10 Drug Manufacturers - General names. BIIB ranks #8 (1.4% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | MRK |
Merck & Co., Inc.
|
116,081 | $14,916,408 | |
| 2 | LLY |
ELI LILLY & Co
|
9,217 | $11,055,147 | |
| 3 | BMY |
Bristol Myers Squibb Co
|
78,510 | $4,523,746 | |
| 4 | AMGN |
Amgen Inc
|
5,354 | $1,938,790 | |
| 5 | GILD |
Gilead Sciences, Inc.
|
8,057 | $1,017,921 | |
| 6 | ABBV |
AbbVie Inc.
|
3,654 | $919,492 | |
| 7 | PFE |
Pfizer Inc
|
27,276 | $656,806 | |
| 8 | BIIB |
Biogen Inc.
This page
|
2,291 | $494,993 |
All Filings in BIIB
Export CSV
47 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $494,993 | 2,291 | Shares | Sole | 2026-08-14 | |
| 2026-03-31 | $309,644 | 1,689 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $393,689 | 2,237 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $1,050,600 | 7,500 | Call | Sole | 2025-11-14 | |
| 2024-12-31 | $2,093,474 | 13,690 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $38,768 | 200 | Put | Sole | 2024-11-14 | |
| 2024-09-30 | $2,788,969 | 14,388 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $3,307,144 | 14,266 | Shares | Sole | 2024-08-14 | |
| 2023-09-30 | $6,367,422 | 24,775 | Shares | Sole | 2023-11-14 | |
| 2023-09-30 | $7,016,373 | 27,300 | Put | Sole | 2023-11-14 | |
| 2023-09-30 | $719,628 | 2,800 | Call | Sole | 2023-11-14 | |
| 2023-06-30 | $797,580 | 2,800 | Call | Sole | 2023-08-14 | |
| 2023-06-30 | $4,247,398 | 14,911 | Shares | Sole | 2023-08-14 | |
| 2023-06-30 | $10,425,510 | 36,600 | Put | Sole | 2023-08-14 | |
| 2023-03-31 | $3,391,966 | 12,200 | Call | Sole | 2023-05-15 | |
| 2022-12-31 | $28,827,372 | 104,100 | Call | Sole | 2023-02-27 | |
| 2022-12-31 | $9,415,280 | 34,000 | Put | Sole | 2023-02-27 | |
| 2022-09-30 | $16,554,000 | 62,000 | Put | Sole | 2022-11-21 | |
| 2022-09-30 | $31,292,400 | 117,200 | Call | Sole | 2022-11-21 | |
| 2022-06-30 | $6,566,868 | 32,200 | Put | Sole | 2022-08-17 | |
| 2022-06-30 | $1,488,762 | 7,300 | Call | Sole | 2022-08-17 | |
| 2022-03-31 | $105,300 | 500 | Call | Sole | 2022-05-16 | |
| 2022-03-31 | $10,361,520 | 49,200 | Put | Sole | 2022-05-16 | |
| 2022-03-31 | $4,828,215 | 22,926 | Shares | Sole | 2022-05-16 | |
| 2021-12-31 | $46,579,508 | 194,146 | Shares | Sole | 2022-02-14 | |
| 2021-12-31 | $66,601,792 | 277,600 | Put | Sole | 2022-02-14 | |
| 2021-12-31 | $19,865,376 | 82,800 | Call | Sole | 2022-02-14 | |
| 2021-09-30 | $55,833,927 | 197,300 | Put | Sole | 2021-11-15 | |
| 2021-09-30 | $26,402,967 | 93,300 | Call | Sole | 2021-11-15 | |
| 2021-09-30 | $21,523,653 | 76,058 | Shares | Sole | 2021-11-15 | |
| 2021-06-30 | $42,106,432 | 121,600 | Put | Sole | 2021-08-16 | |
| 2021-06-30 | $4,582,883 | 13,235 | Shares | Sole | 2021-08-16 | |
| 2021-06-30 | $21,676,502 | 62,600 | Call | Sole | 2021-08-16 | |
| 2021-03-31 | $6,993,750 | 25,000 | Put | Sole | 2021-05-14 | |
| 2021-03-31 | $67,699 | 242 | Shares | Sole | 2021-05-14 | |
| 2020-12-31 | $8,790,474 | 35,900 | Put | Sole | 2021-02-16 | |
| 2020-12-31 | $12,218,514 | 49,900 | Call | Sole | 2021-02-16 | |
| 2020-12-31 | $399,121 | 1,630 | Shares | Sole | 2021-02-16 | |
| 2020-09-30 | $13,049,280 | 46,000 | Put | Sole | 2020-11-13 | |
| 2020-09-30 | $4,420,869 | 15,584 | Shares | Sole | 2020-11-13 | |
| 2020-09-30 | $9,815,328 | 34,600 | Call | Sole | 2020-11-13 | |
| 2020-06-30 | $13,431,010 | 50,200 | Put | Sole | 2020-08-14 | |
| 2020-06-30 | $3,531,660 | 13,200 | Call | Sole | 2020-08-14 | |
| 2020-06-30 | $4,988,737 | 18,646 | Shares | Sole | 2020-08-14 | |
| 2020-03-31 | $11,041,662 | 34,900 | Put | Sole | 2020-05-15 | |
| 2020-03-31 | $411,294 | 1,300 | Call | Sole | 2020-05-15 | |
| 2020-03-31 | $2,343,426 | 7,407 | Shares | Sole | 2020-05-15 | |
| No filing history on record for this holder in this stock. | ||||||