BIOGEN INC

$BIIB

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Smart money positioned

17 of the Top-200 alpha managers hold $BIIB as of the latest 13F snapshot.

13F holders

996

Insider buys · 90d

Congress · 90d

2trades

Smart Money · top-200 alpha cohort

17 holders · Q1 2026

$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.

Lpwm LLC

1.67% ↓ 0.7pp

α +19.0pts

Sectoral Asset Management Inc.

0.32% NEW

α +39.3pts

ADAR1 Capital Management, LLC

0.12% held

α +74.0pts

Wellington Management Group LLP

0.10% held

α +10.5pts

Erste Asset Management GmbH

0.09% held

α +33.4pts

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.

Institutional holders

Top 10 of 996 · Source: 13F-HR

Primecap Management CO

1.97% of portfolio

14,757,997 sh

First Financial Bankshares Inc.

ProShare Advisors LLC

0.05% of portfolio

2,638,834 sh

Brightline Capital Management, LLC

Point72 Asset Management, L.P.

1.26% of portfolio

2,000,000 sh

Renaissancere Holdings Ltd.

0.06% of portfolio

1,541,376 sh

See all 996 13F holders · Pro →

Insider activity · last 90 days

7 transactions · 4 filers

09 Feb 2026

Singhal Priya —

▼ SOLD

2,660

$199.83

02 Feb 2026

Singhal Priya —

▼ SOLD

748

$179.30

02 Sep 2025

Singhal Priya —

▼ SOLD

517

$133.55

08 Jul 2025

Izzar Rachid —

▼ SOLD

2,223

$135.00

19 May 2025

Singhal Priya —

▼ SOLD

3,806

$126.25

02 May 2025

Dorsa Caroline —

▲ BOUGHT

1,235

$122.72

07 Mar 2025

Sherwin Stephen A —

▼ SOLD

8,760

$150.02

Transaction 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.