$BIIB is held by 17 managers from the Top-Performer cohort as of Q1 2026. Position weights range from 0.00% to 1.67%, with an average of 0.15% of portfolio. Largest holder: Lpwm LLC at 1.67%. A weekly Smart-Money commentary for this ticker has not been generated yet this batch — the table below shows the full cohort positioning.
BIOGEN INC
13F holders
996
Net 13F flow · Q
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Insider buys · 90d
0
Insider net · 90d
—
Congress · 90d
0
Convergence
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Institutional holders
Top 10 of 996 · Source: 13F-HR01
Primecap Management CO
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02
First Financial Bankshares Inc.
—
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03
Axa S.a.
—
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04
State Street
—
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05
ProShare Advisors LLC
—
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06
Brightline Capital Management, LLC
—
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07
US Bancorp De
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08
Nbc Securities, Inc.
—
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09
Point72 Asset Management, L.P.
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10
Renaissancere Holdings Ltd.
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Each fund name links to that filer's expert page. Share counts and per-fund weights are pending the 13F ingest fix (portfolios_expertholding.units is currently mis-populated — see the same caveat on the fund detail page's holdings table). Quarter-over-quarter delta ships with the metrics pipeline.
Smart Money · top-200 alpha cohort
17 holders · Q1 202601
Lpwm LLC
1.67% ↓ 0.7pp
α +19.0pts
02
Sectoral Asset Management Inc.
0.32% NEW
α +39.3pts
03
ADAR1 Capital Management, LLC
0.12% held
α +74.0pts
04
Wellington Management Group LLP
0.10% held
α +10.5pts
05
Erste Asset Management GmbH
0.09% held
α +33.4pts
06
Banque Pictet & Cie SA
0.09% held
α +10.3pts
07
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC
0.05% held
α +27.5pts
08
Caption Management, LLC
0.04% held
α +15.5pts
09
Citigroup Inc.
0.04% held
α +26.3pts
10
Nisa Investment Advisors, LLC
0.02% held
α +16.6pts
11
WINTON GROUP Ltd
0.02% held
α +27.0pts
12
Costello Asset Management, INC
0.02% held
α +14.3pts
13
Bellevue Group AG
0.02% held
α +12.2pts
14
New Age Alpha Advisors, LLC
0.01% held
α +10.8pts
15
Principal Securities, Inc.
0.00% held
α +21.3pts
16
Johnson Financial Group, Inc.
0.00% held
α +14.7pts
17
Level Financial Advisors
0.00% held
α +30.9pts
Smart Money shows holdings from our Top-Performer cohort — the 200 highest-alpha manager_13f funds in our universe. Position weight (current quarter) and QoQ delta versus prior quarter. α is the manager's annual alpha vs benchmark.
Insider activity · last 90 days
7 transactions · 4 filersTransaction codes: P open-market purchase · S sale · M option exercise · A grant · F tax-withhold sale. Insider names link to each individual's expert page.
Congress trades · last 90 days
18 disclosures · STOCK ActConvergence · Pattern Engine ships in v1.1
30-day windowIn development
Convergence detection for $BIIB lands with the Pattern Engine.
Once the Pattern Engine ships, this section will surface every active convergence event involving $BIIB — the institutional managers and Congress members on the same name, the 30-day window, and the combined position size.
Source data: SEC EDGAR · 13F-HR · Form 4 · CapitolTrades · Last refreshed 09:35 UTC.