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$BIIB

$199.00 -$10.03 (4.8%)

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Insider Transactions

Insider Transaction Summary

GEORGE A SCANGOS

54,779 shares

Net: 0 B/S: -

John Cox

39,045 shares

Net: 0 B/S: -

Christopher Viehbacher

38,015 shares

Net: +46,303 B/S: ∞

CAROLINE DORSA

31,002 shares

Net: 0 B/S: -

Michel Vounatsos

30,210 shares

Net: 0 B/S: -

Eric K Rowinsky

25,844 shares

Net: +1,505 B/S: ∞

MICHAEL R MCDONNELL

24,341 shares

Net: 0 B/S: -

ROBERT W PANGIA

20,632 shares

Net: 0 B/S: -

STEPHEN A SHERWIN

15,193 shares

Net: +1,505 B/S: ∞

Richard Mulligan

15,099 shares

Net: 0 B/S: -

ALEXANDER J DENNER

15,099 shares

Net: 0 B/S: -

NANCY LEAMING

13,763 shares

Net: 0 B/S: -

DOUGLAS E WILLIAMS

11,817 shares

Net: 0 B/S: -

Jesus B Mantas

11,263 shares

Net: +1,505 B/S: ∞

Paul J Clancy

10,813 shares

Net: 0 B/S: -

Priya Singhal

10,560 shares

Net: +9,905 B/S: 4.15

Nicole Murphy

10,560 shares

Net: +11,648 B/S: ∞

WILLIAM A HAWKINS

10,365 shares

Net: +1,505 B/S: ∞

Alfred Sandrock

10,169 shares

Net: 0 B/S: -

STELIOS PAPADOPOULOS

10,095 shares

Net: 0 B/S: -

Chirfi Guindo

9,668 shares

Net: 0 B/S: -

LYNN SCHENK

9,032 shares

Net: 0 B/S: -

Maria C Freire

8,820 shares

Net: +2,005 B/S: ∞

Robin Kramer

8,450 shares

Net: +8,966 B/S: ∞

SUSAN H ALEXANDER

8,450 shares

Net: +9,581 B/S: ∞

Jane Grogan

8,450 shares

Net: +9,786 B/S: ∞

JEFFREY D CAPELLO

8,348 shares

Net: 0 B/S: -

Ginger Gregory

8,025 shares

Net: +8,869 B/S: ∞

Brian S Posner

8,025 shares

Net: 0 B/S: -

Rachid Izzar

7,390 shares

Net: +8,629 B/S: ∞

Adriana Karaboutis

6,886 shares

Net: 0 B/S: -

Adam Keeney

6,820 shares

Net: +9,722 B/S: ∞

SUSAN LANGER

6,634 shares

Net: +1,505 B/S: ∞

Daniel Karp

6,030 shares

Net: 0 B/S: -

Monish D Patolawala

5,215 shares

Net: +1,505 B/S: ∞

Alphonse Galdes

5,064 shares

Net: 0 B/S: -

Jean-Paul Kress

4,660 shares

Net: 0 B/S: -

Lloyd Minor

3,875 shares

Net: +1,505 B/S: ∞

Steven H Holtzman

3,462 shares

Net: 0 B/S: -

Spyridon Artavanis-Tsakonas

3,150 shares

Net: 0 B/S: -

Adam Koppel

2,402 shares

Net: 0 B/S: -

Menelas N Pangalos

2,370 shares

Net: +3,875 B/S: ∞

WILLIAM D /CA/ JONES

2,145 shares

Net: 0 B/S: -

Sean Godbout

1,396 shares

Net: +2,126 B/S: ∞

Kenneth DiPietro

1,174 shares

Net: 0 B/S: -

GREGORY F COVINO

531 shares

Net: 0 B/S: -

Michael D Ehlers

0 shares

Net: 0 B/S: -

Paul McKenzie

0 shares

Net: 0 B/S: -

Insider Name	Current Shares	Net Change (1yr)	Buy/Sell Ratio
GEORGE A SCANGOS	54,779	0	-
John Cox	39,045	0	-
Christopher Viehbacher	38,015	+46,303	∞
CAROLINE DORSA	31,002	0	-
Michel Vounatsos	30,210	0	-
Eric K Rowinsky	25,844	+1,505	∞
MICHAEL R MCDONNELL	24,341	0	-
ROBERT W PANGIA	20,632	0	-
STEPHEN A SHERWIN	15,193	+1,505	∞
Richard Mulligan	15,099	0	-
ALEXANDER J DENNER	15,099	0	-
NANCY LEAMING	13,763	0	-
DOUGLAS E WILLIAMS	11,817	0	-
Jesus B Mantas	11,263	+1,505	∞
Paul J Clancy	10,813	0	-
Priya Singhal	10,560	+9,905	4.15
Nicole Murphy	10,560	+11,648	∞
WILLIAM A HAWKINS	10,365	+1,505	∞
Alfred Sandrock	10,169	0	-
STELIOS PAPADOPOULOS	10,095	0	-
Chirfi Guindo	9,668	0	-
LYNN SCHENK	9,032	0	-
Maria C Freire	8,820	+2,005	∞
Robin Kramer	8,450	+8,966	∞
SUSAN H ALEXANDER	8,450	+9,581	∞
Jane Grogan	8,450	+9,786	∞
JEFFREY D CAPELLO	8,348	0	-
Ginger Gregory	8,025	+8,869	∞
Brian S Posner	8,025	0	-
Rachid Izzar	7,390	+8,629	∞
Adriana Karaboutis	6,886	0	-
Adam Keeney	6,820	+9,722	∞
SUSAN LANGER	6,634	+1,505	∞
Daniel Karp	6,030	0	-
Monish D Patolawala	5,215	+1,505	∞
Alphonse Galdes	5,064	0	-
Jean-Paul Kress	4,660	0	-
Lloyd Minor	3,875	+1,505	∞
Steven H Holtzman	3,462	0	-
Spyridon Artavanis-Tsakonas	3,150	0	-
Adam Koppel	2,402	0	-
Menelas N Pangalos	2,370	+3,875	∞
WILLIAM D /CA/ JONES	2,145	0	-
Sean Godbout	1,396	+2,126	∞
Kenneth DiPietro	1,174	0	-
GREGORY F COVINO	531	0	-
Michael D Ehlers	0	0	-
Paul McKenzie	0	0	-

Individual Transactions

June 09, 2026

Eric K Rowinsky

Grant/Award Acquisition

Change: +1,505

Price: $0.00

Shares: 25,844

Value: +$0

Maria C Freire

Grant/Award Acquisition

Change: +2,005

Price: $0.00

Shares: 8,820

Value: +$0

STEPHEN A SHERWIN

Grant/Award Acquisition

Change: +1,505

Price: $0.00

Shares: 15,193

Value: +$0

WILLIAM A HAWKINS

Grant/Award Acquisition

Change: +1,505

Price: $0.00

Shares: 10,365

Value: +$0

Jesus B Mantas

Grant/Award Acquisition

Change: +1,505

Price: $0.00

Shares: 11,263

Value: +$0

Monish D Patolawala

Grant/Award Acquisition

Change: +1,505

Price: $0.00

Shares: 5,215

Value: +$0

SUSAN LANGER

Grant/Award Acquisition

Change: +1,505

Price: $0.00

Shares: 6,634

Value: +$0

Menelas N Pangalos

Grant/Award Acquisition

Change: +1,505

Price: $0.00

Shares: 3,875

Value: +$0

Lloyd Minor

Grant/Award Acquisition

Change: +1,505

Price: $0.00

Shares: 3,875

Value: +$0

Menelas N Pangalos

Option Exercise/Conversion

Change: +2,370

Price: $0.00

Shares: 2,370

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Eric K Rowinsky	Jun 11	Grant/Award Acquisition (A) Compensation/Award	25,844	+1,505	$0.00	+$0
Maria C Freire	Jun 11	Grant/Award Acquisition (A) Compensation/Award	8,820	+2,005	$0.00	+$0
STEPHEN A SHERWIN	Jun 11	Grant/Award Acquisition (A) Compensation/Award	15,193	+1,505	$0.00	+$0
WILLIAM A HAWKINS	Jun 11	Grant/Award Acquisition (A) Compensation/Award	10,365	+1,505	$0.00	+$0
Jesus B Mantas	Jun 11	Grant/Award Acquisition (A) Compensation/Award	11,263	+1,505	$0.00	+$0
Monish D Patolawala	Jun 11	Grant/Award Acquisition (A) Compensation/Award	5,215	+1,505	$0.00	+$0
SUSAN LANGER	Jun 11	Grant/Award Acquisition (A) Compensation/Award	6,634	+1,505	$0.00	+$0
Menelas N Pangalos	Jun 11	Grant/Award Acquisition (A) Compensation/Award	3,875	+1,505	$0.00	+$0
Lloyd Minor	Jun 11	Grant/Award Acquisition (A) Compensation/Award	3,875	+1,505	$0.00	+$0
Menelas N Pangalos	Jun 11	Option Exercise/Conversion (M) Compensation/Award	2,370	+2,370	$0.00	+$0

May 01, 2026

Adam Keeney

Tax Payment

Change: -455

Price: $187.06

Shares: 6,365

Value: -$85,112

Adam Keeney

Option Exercise/Conversion

Change: +939

Price: $0.00

Shares: 6,820

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Adam Keeney	May 05	Tax Payment (F) Tax Payment	6,365	-455	$187.06	-$85,112
Adam Keeney	May 05	Option Exercise/Conversion (M) Compensation/Award	6,820	+939	$0.00	+$0

April 01, 2026

Sean Godbout

Tax Payment

Change: -54

Price: $183.78

Shares: 1,342

Value: -$9,924

Sean Godbout

Option Exercise/Conversion

Change: +181

Price: $0.00

Shares: 1,396

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Sean Godbout	Apr 03	Tax Payment (F) Tax Payment	1,342	-54	$183.78	-$9,924
Sean Godbout	Apr 03	Option Exercise/Conversion (M) Compensation/Award	1,396	+181	$0.00	+$0

February 13, 2026

Sean Godbout

Grant/Award Acquisition

Change: +1,800

Price: $0.00

Shares: 1,800

Value: +$0

Jane Grogan

Grant/Award Acquisition

Change: +8,450

Price: $0.00

Shares: 8,450

Value: +$0

Adam Keeney

Grant/Award Acquisition

Change: +8,025

Price: $0.00

Shares: 8,025

Value: +$0

Nicole Murphy

Grant/Award Acquisition

Change: +10,560

Price: $0.00

Shares: 10,560

Value: +$0

Rachid Izzar

Grant/Award Acquisition

Change: +7,390

Price: $0.00

Shares: 7,390

Value: +$0

Christopher Viehbacher

Grant/Award Acquisition

Change: +38,015

Price: $0.00

Shares: 38,015

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Sean Godbout	Feb 17	Grant/Award Acquisition (A) Compensation/Award	1,800	+1,800	$0.00	+$0
Jane Grogan	Feb 17	Grant/Award Acquisition (A) Compensation/Award	8,450	+8,450	$0.00	+$0
Adam Keeney	Feb 17	Grant/Award Acquisition (A) Compensation/Award	8,025	+8,025	$0.00	+$0
Nicole Murphy	Feb 17	Grant/Award Acquisition (A) Compensation/Award	10,560	+10,560	$0.00	+$0
Rachid Izzar	Feb 17	Grant/Award Acquisition (A) Compensation/Award	7,390	+7,390	$0.00	+$0
Christopher Viehbacher	Feb 17	Grant/Award Acquisition (A) Compensation/Award	38,015	+38,015	$0.00	+$0