Position in BIIB
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$30,865,467
+$9,144,346 QoQ
Shares Held
142,856
+20.6% QoQ
Ownership
0.097%
of shares outstanding
% of Portfolio
1.16%
of 13F equity value
Holder Rank
#82
of 1,036 holders
Holding Since
Dec 2025
3 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in BIIB Over Time
Shares Held
Position Value (USD)
Position in Drug Manufacturers - General
Healthcare · as of Jun 30, 2026Portolan Capital Management, LLC holds $30,865,467 across 1 Drug Manufacturers - General name. BIIB ranks #1 (100.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | BIIB |
Biogen Inc.
This page
|
142,856 | $30,865,467 |
All Filings in BIIB
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3 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $30,865,467 | 142,856 | Shares | Sole | 2026-08-14 | |
| 2026-03-31 | $21,721,121 | 118,481 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $14,957,390 | 84,990 | Shares | Sole | 2026-02-17 | |
| No filing history on record for this holder in this stock. | ||||||