BIIB insider transactions

Head of Corporate Development Keeney Adam converted options into 939 shares and covered exercise/tax liability with 455 shares, increasing direct ownership by 8% to 6,365 units (SEC Form 4)

SEC Form 4 filed by Godbout Sean

SEC Form 4 filed by President and CEO Viehbacher Christopher

SEC Form 4 filed by Head of Development Singhal Priya

Head of Pharm Ops and Tech Murphy Nicole bought $585 worth of shares (3 units at $195.03), increasing direct ownership by 0.02% to 19,611 units (SEC Form 4)

SEC Form 4 filed by Chief Financial Officer Kramer Robin

SEC Form 4 filed by Head of Corporate Development Keeney Adam

SEC Form 4 filed by Head of Global Product Strat. Izzar Rachid

SEC Form 4 filed by Head of Research Grogan Jane

SEC Form 4 filed by EVP, Human Resources Gregory Ginger

SEC Form 4 filed by Chief Accounting Officer Godbout Sean

SEC Form 4 filed by EVP Chief Legal Officer Alexander Susan H

President and CEO Viehbacher Christopher converted options into 24,461 shares and covered exercise/tax liability with 10,980 shares, increasing direct ownership by 82% to 29,924 units (SEC Form 4)

Head of Development Singhal Priya converted options into 6,900 shares, covered exercise/tax liability with 2,468 shares and sold $531,548 worth of shares (2,660 units at $199.83), increasing direct ownership by 28% to 8,043 units (SEC Form 4)

Head of Pharm Ops and Tech Murphy Nicole converted options into 8,725 shares and covered exercise/tax liability with 3,339 shares, increasing direct ownership by 38% to 19,608 units (SEC Form 4)

Chief Financial Officer Kramer Robin converted options into 5,003 shares and covered exercise/tax liability with 1,543 shares, increasing direct ownership by 43% to 11,472 units (SEC Form 4)

Head of Corporate Development Keeney Adam converted options into 5,080 shares and covered exercise/tax liability with 1,583 shares, increasing direct ownership by 147% to 5,881 units (SEC Form 4)

Head of Global Product Strat. Izzar Rachid converted options into 6,889 shares and covered exercise/tax liability with 2,038 shares, increasing direct ownership by 79% to 11,011 units (SEC Form 4)

Head of Research Grogan Jane converted options into 3,258 shares and covered exercise/tax liability with 991 shares, increasing direct ownership by 127% to 4,058 units (SEC Form 4)

EVP, Human Resources Gregory Ginger converted options into 7,183 shares and covered exercise/tax liability with 2,589 shares, increasing direct ownership by 26% to 22,359 units (SEC Form 4)

Chief Accounting Officer Godbout Sean converted options into 1,079 shares and covered exercise/tax liability with 359 shares, increasing direct ownership by 146% to 1,215 units (SEC Form 4)

EVP Chief Legal Officer Alexander Susan H covered exercise/tax liability with 3,504 shares and converted options into 9,046 shares, increasing direct ownership by 15% to 41,807 units (SEC Form 4)

Head of Development Singhal Priya converted options into 1,829 shares, covered exercise/tax liability with 582 shares and sold $134,116 worth of shares (748 units at $179.30), increasing direct ownership by 9% to 6,271 units (SEC Form 4)

President and CEO Viehbacher Christopher converted options into 7,040 shares and covered exercise/tax liability with 3,404 shares, increasing direct ownership by 28% to 16,443 units (SEC Form 4)

Head of Research Grogan Jane converted options into 695 shares and covered exercise/tax liability with 337 shares, increasing direct ownership by 25% to 1,791 units (SEC Form 4)

Chief Accounting Officer Godbout Sean converted options into 26 shares and covered exercise/tax liability with 8 shares, increasing direct ownership by 4% to 495 units (SEC Form 4)

Head of Development Singhal Priya converted options into 1,669 shares, covered exercise/tax liability with 807 shares and sold $69,045 worth of shares (517 units at $133.55), increasing direct ownership by 6% to 5,772 units (SEC Form 4)

Head of Global Product Strat. Izzar Rachid sold $300,105 worth of shares (2,223 units at $135.00), decreasing direct ownership by 26% to 6,330 units (SEC Form 4)

SEC Form 4 filed by Director Pangalos Menelas N

Director Minor Lloyd was granted 2,370 shares (SEC Form 4)

Director Patolawala Monish D was granted 2,370 shares, increasing direct ownership by 177% to 3,710 units (SEC Form 4)

Director Mantas Jesus B was granted 2,370 shares, increasing direct ownership by 32% to 9,758 units (SEC Form 4)

Director Hawkins William A was granted 2,370 shares, increasing direct ownership by 37% to 8,860 units (SEC Form 4)

Director Freire Maria C was granted 2,370 shares, increasing direct ownership by 53% to 6,815 units (SEC Form 4)

Director Rowinsky Eric K was granted 2,370 shares, increasing direct ownership by 11% to 24,339 units (SEC Form 4)

Director Sherwin Stephen A was granted 2,370 shares, increasing direct ownership by 21% to 13,688 units (SEC Form 4)

Director Langer Susan was granted 2,370 shares, increasing direct ownership by 86% to 5,129 units (SEC Form 4)

Director Dorsa Caroline was granted 3,160 shares, increasing direct ownership by 11% to 31,002 units (SEC Form 4)

Head of Development Singhal Priya sold $480,508 worth of shares (3,806 units at $126.25), decreasing direct ownership by 41% to 5,427 units (SEC Form 4)

Head of Corporate Development Keeney Adam converted options into 938 shares and covered exercise/tax liability with 454 shares, increasing direct ownership by 25% to 2,384 units (SEC Form 4)

Director Dorsa Caroline bought $151,559 worth of shares (1,235 units at $122.72), increasing direct ownership by 5% to 27,842 units (SEC Form 4)

SEC Form 4 filed by Chief Accounting Officer Godbout Sean

Director Sherwin Stephen A sold $1,314,142 worth of shares (8,760 units at $150.02), decreasing direct ownership by 44% to 11,318 units (SEC Form 4)

New insider Godbout Sean claimed ownership of 310 shares (SEC Form 3)

Head of Development Singhal Priya converted options into 1,212 shares and covered exercise/tax liability with 357 shares, increasing direct ownership by 10% to 9,066 units (SEC Form 4)

Head of Pharm Ops and Tech Murphy Nicole converted options into 2,272 shares and covered exercise/tax liability with 670 shares, increasing direct ownership by 13% to 14,055 units (SEC Form 4)

EVP, Chief Financial Officer Mcdonnell Michael R converted options into 3,257 shares and covered exercise/tax liability with 1,371 shares, increasing direct ownership by 8% to 24,341 units (SEC Form 4)

Chief Accounting Officer Kramer Robin converted options into 834 shares and covered exercise/tax liability with 245 shares, increasing direct ownership by 8% to 8,012 units (SEC Form 4)

EVP, Human Resources Gregory Ginger covered exercise/tax liability with 634 shares and converted options into 2,159 shares, increasing direct ownership by 9% to 17,598 units (SEC Form 4)

EVP Chief Legal Officer Alexander Susan H converted options into 2,575 shares and covered exercise/tax liability with 807 shares, increasing direct ownership by 5% to 36,265 units (SEC Form 4)

Head of Global Product Strat. Izzar Rachid covered exercise/tax liability with 445 shares and converted options into 1,515 shares, increasing direct ownership by 14% to 8,553 units (SEC Form 4)

Head of Global Product Strat. Izzar Rachid converted options into 3,844 shares and covered exercise/tax liability with 1,165 shares, increasing direct ownership by 52% to 7,860 units (SEC Form 4)

EVP, Chief Financial Officer Mcdonnell Michael R converted options into 4,551 shares and covered exercise/tax liability with 1,502 shares, increasing direct ownership by 16% to 22,455 units (SEC Form 4)

President and CEO Viehbacher Christopher converted options into 9,008 shares and covered exercise/tax liability with 3,201 shares, increasing direct ownership by 83% to 12,807 units (SEC Form 4)

Head of Research Grogan Jane converted options into 1,385 shares and covered exercise/tax liability with 443 shares, increasing direct ownership by 192% to 1,433 units (SEC Form 4)

Head of Corporate Development Keeney Adam converted options into 1,801 shares and covered exercise/tax liability with 563 shares, increasing direct ownership by 187% to 1,900 units (SEC Form 4)

SEC Form 4 filed by Head of Global Product Strat. Izzar Rachid

Chief Accounting Officer Kramer Robin converted options into 1,491 shares and covered exercise/tax liability with 476 shares, increasing direct ownership by 16% to 7,423 units (SEC Form 4)

Head of Pharm Ops and Tech Murphy Nicole converted options into 4,042 shares and covered exercise/tax liability with 1,223 shares, increasing direct ownership by 29% to 12,453 units (SEC Form 4)

Head of Development Singhal Priya converted options into 2,216 shares and covered exercise/tax liability with 681 shares, increasing direct ownership by 23% to 8,211 units (SEC Form 4)