2 tracked superinvestors hold Biogen Inc (BIIB), worth $2.9B combined, led by PRIMECAP team. Smart money is accumulating BIIB as of the latest 13F filings.
Current price
$220.83
+57.8%
1Y
Biogen Inc. is a leading biotechnology firm dedicated to the discovery, development, production, and distribution of treatments for complex neurological and neurodegenerative conditions. Its established portfolio includes a range of medications addressing multiple sclerosis (MS), such as TECFIDERA, VUMERITY, AVONEX, PLEGRIDY, TYSABRI, and FAMPYRA. For spinal muscular atrophy (SMA), Biogen…
Market cap
$27.6B
P/E
20.11
Div yield
0.0%
Revenue YoY
1.4%
Analyst target
$244
Snapshot for context. For deep analysis use a stock screener — this page is about who owns it.
Superinvestors holding
2
tracked 13F / N-PORT funds
Combined value
$2.9B
disclosed long exposure
Tier-1 conviction
0
concentrated holders
Net this quarter
+1
1 buying · 0 selling
Smart money is net accumulating BIIB: 1 funds added or opened versus 0 trimming.
Biogen Inc (BIIB) appears mainly in diversified and quant books here (2 funds, $2.9B combined) rather than in concentrated conviction portfolios — read the holders below with that in mind.
The largest position belongs to PRIMECAP team at 1.9% of their book — no single tracked manager treats it as an outsized, top-weighted bet.
No tracked fund opened a new position this quarter; 1 added and 0 trimmed, a net add.
| Investor | Move | % of their portfolio | Position value |
|---|---|---|---|
| Held | 1.9% | $1.8B | |
| Added | 0.7% | $1.1B |
Tier badge = signal quality: 1 concentrated conviction · 2 quant/multi (context) · 3 retail & diversified. Only Tier 1 holdings feed the consensus signal.
Which superinvestors own BIIB?
2 tracked funds hold Biogen Inc (BIIB), the largest being PRIMECAP team (Vanguard PRIMECAP) at 1.9% of its 13F portfolio. 0 of them are concentrated Tier-1 conviction managers.
Is smart money buying or selling BIIB?
In the most recent 13F quarter, 1 tracked fund added or opened BIIB and 0 trimmed it.
How much BIIB do tracked funds hold?
Combined disclosed long exposure to BIIB across tracked superinvestors is $2.9B as of the Jun 2026 filings.
One email when a tracked manager opens, adds to or files to sell a position — from Form 4, 13D and Form 144, not the 45-day-old 13F.
Holdings aggregated from the latest SEC 13F & N-PORT filings via FMP · Jun 2026 quarter. Long equity positions only, reported with up to a 45-day delay — for activity between filings see real-time moves. Not financial advice.