Biogen Inc (BIIB)

The most recent insider trading activity occurred on February 12, 2026, with a buy transaction by Nicole Murphy. Prior to this, significant sell transactions were noted in February 2026 by Priya Singhal, and in July 2025 by Rachid Izzar. Other notable transactions include sales by Stephen A. Sherwin in March 2025 and buys by Caroline Dorsain in May 2025.
Stock chart
Ticker: BIIB Exchange: NSM


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Purchase Sale Planned purchase Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
Murphy Nicole
Head of Pharm Ops and Tech
1 purchase — total 585 USD
Buy 12 Feb 2026
Value US$4,496,578.69 | Price 445.67 | Shares 97,991
Sale 9 Feb 2026
Value US$1,858,512.78 | Price 53.15 | Shares 27,486
Proposed sale 9 Feb 2026
Value US$3,951,409.18 | Price 182.82 | Shares 30,414
Sale 2 Feb 2026
Value US$134,116.40 | Price 179.30 | Shares 748
Sale 2 Feb 2026
Value US$134,116.40 | Price 179.30 | Shares 748
Proposed sale 2 Feb 2026
Value US$134,116.40 | Price 179.30 | Shares 748
Proposed sale 2 Sep 2025
Value US$69,045.35 | Price 133.55 | Shares 517
Sale 2 Sep 2025
Value US$69,045.35 | Price 133.55 | Shares 517
Sale 8 Jul 2025
Value US$300,105.00 | Price 135.00 | Shares 2,223
Proposed sale 8 Jul 2025
Value US$300,105.00 | Price 135.00 | Shares 2,223
Planned sale 19 May 2025
Value US$480,507.50 | Price 126.25 | Shares 3,806
Proposed sale 19 May 2025
Value US$480,507.50 | Price 126.25 | Shares 3,806
Buy 2 May 2025
Value US$151,559.20 | Price 122.72 | Shares 1,235
Sale 7 Mar 2025
Value US$1,314,141.91 | Price 150.02 | Shares 8,760
Proposed sale 7 Mar 2025
Value US$1,290,961.20 | Price 147.37 | Shares 8,760
Proposed sale 9 Dec 2024
Value US$17,293.10 | Price 157.21 | Shares 110
Sale 9 Dec 2024
Value US$17,293.10 | Price 157.21 | Shares 110
Sale 3 Sep 2024
Value US$88,018.82 | Price 204.22 | Shares 431
Proposed sale 3 Sep 2024
Value US$88,018.82 | Price 204.22 | Shares 431
Planned sale 2 Apr 2024
Value US$19,817.37 | Price 213.09 | Shares 93
Proposed sale 2 Apr 2024
Value US$19,817.37 | Price 213.09 | Shares 93
Sale 22 Feb 2024
Value US$57,962.26 | Price 221.23 | Shares 262
Proposed sale 22 Feb 2024
Value US$57,962.26 | Price 221.23 | Shares 262
Proposed sale 21 Feb 2024
Value US$23,920.92 | Price 221.49 | Shares 108
Sale 16 Feb 2024
Value US$23,920.92 | Price 221.49 | Shares 108
Buy 15 Feb 2024
Value US$101,255.70 | Price 222.54 | Shares 455
Sale 12 Feb 2024
Value US$100,329.55 | Price 239.45 | Shares 419
Proposed sale 12 Feb 2024
Value US$100,329.55 | Price 239.45 | Shares 419
Sale 2 Feb 2024
Value US$155,919.62 | Price 245.93 | Shares 634
Proposed sale 2 Feb 2024
Value US$155,919.62 | Price 245.93 | Shares 634
Sale 11 Dec 2023
Value US$27,280.00 | Price 248.00 | Shares 110
Proposed sale 11 Dec 2023
Value US$27,280.00 | Price 248.00 | Shares 110
Sale 5 Sep 2023
Value US$116,124.33 | Price 269.43 | Shares 431
Proposed sale 5 Sep 2023
Value US$116,124.33 | Price 269.43 | Shares 431
Sale 3 Jul 2023
Value US$22,912.47 | Price 282.87 | Shares 81
Proposed sale 3 Jul 2023
Value US$22,912.47 | Price 282.87 | Shares 81
Planned sale 28 Apr 2023
Value US$804,300.00 | Price 300.00 | Shares 2,681
Proposed sale 28 Apr 2023
Value US$804,300.00 | Price 300.00 | Shares 2,681
Planned sale 4 Apr 2023
Value US$25,217.01 | Price 277.11 | Shares 91
Proposed sale 4 Apr 2023
Value US$25,217.01 | Price 277.11 | Shares 91
Planned sale 28 Mar 2023
Value US$153,394.08 | Price 270.06 | Shares 568
Proposed sale 28 Mar 2023
Value US$153,394.08 | Price 270.06 | Shares 568
Planned sale 14 Nov 2022
Value US$1,683,617.10 | Price 300.11 | Shares 5,610
Planned sale 27 Oct 2022
Value US$1,552,832.40 | Price 280.70 | Shares 5,532
Planned sale 7 Jun 2021
Value US$3,375,680.00 | Price 440.00 | Shares 7,672
Planned sale 4 Jun 2021
Value US$98,701.20 | Price 274.17 | Shares 360
Buy 9 Feb 2021
Value US$239,766.00 | Price 267.00 | Shares 898
Planned buy 30 Nov 2020
Value US$748,046.74 | Price 241.31 | Shares 3,100
Planned sale 4 Nov 2020
Value US$525,000.00 | Price 350.00 | Shares 1,500
Planned sale 11 Mar 2020
Value US$79,728.30 | Price 295.29 | Shares 270
Planned sale 11 Mar 2020
Value US$638,845.26 | Price 295.22 | Shares 2,164
Planned sale 2 Dec 2019
Value US$308,429.25 | Price 292.35 | Shares 1,055
Buy 2 May 2019
Value US$8,787,120.00 | Price 231.24 | Shares 38,000
Planned buy 1 May 2019
Value US$1,007,169.48 | Price 231.48 | Shares 4,351
Buy 1 May 2019
Value US$6,883,800.00 | Price 229.46 | Shares 30,000
Buy 30 Apr 2019
Value US$11,540,903.50 | Price 229.25 | Shares 50,342
Planned sale 18 Mar 2019
Value US$2,008,754.70 | Price 328.55 | Shares 6,114
Buy 1 Feb 2019
Value US$2,299,162.60 | Price 328.45 | Shares 7,000
Buy 31 Jan 2019
Value US$8,527,392.78 | Price 330.52 | Shares 25,800
Buy 30 Jan 2019
Value US$9,745,851.00 | Price 324.86 | Shares 30,000
Planned sale 26 Sep 2018
Value US$350,000.00 | Price 350.00 | Shares 1,000
Buy 25 Apr 2018
Value US$12,955,680.00 | Price 269.91 | Shares 48,000
Planned sale 27 Feb 2018
Value US$75,324.97 | Price 290.83 | Shares 259
Planned sale 23 Feb 2018
Value US$266,443.52 | Price 293.44 | Shares 908
Planned sale 20 Feb 2018
Value US$216,956.00 | Price 292.00 | Shares 743
Planned sale 15 Feb 2018
Value US$386,711.90 | Price 298.85 | Shares 1,294
Planned sale 9 Jan 2018
Value US$1,922,518.80 | Price 329.65 | Shares 5,832
Planned buy 29 Dec 2017
Value US$250,029.00 | Price 320.55 | Shares 780
Buy 29 Nov 2017
Value US$3,198,400.00 | Price 319.84 | Shares 10,000
Buy 28 Nov 2017
Value US$6,322,400.00 | Price 316.12 | Shares 20,000
Planned sale 25 Jul 2017
Value US$1,442,509.74 | Price 290.01 | Shares 4,974
Planned sale 19 Jul 2017
Value US$2,211,030.00 | Price 285.00 | Shares 7,758
Planned sale 9 Jun 2017
Value US$277,840.04 | Price 256.31 | Shares 1,084
Planned buy 1 May 2017
Value US$380,432.70 | Price 271.35 | Shares 1,402
Buy 27 Apr 2017
Value US$16,390,775.84 | Price 278.48 | Shares 58,858
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value
Number of shares Price Value Details
2026-02-17 2026-02-12 B Purchase

Head of Pharm Ops and Tech

Officer
97,991 -48.6%
445.67
US$4,496,579
97,991 -48.6% 445.67 US$4,496,579
2026-02-10 2026-02-09 S Sale

Head of Development

Officer
27,486 -45.2%
53.15
US$1,858,513
27,486 -45.2% 53.15 US$1,858,513
2026-02-09 2026-02-09 PrS Proposed sale

Officer

Officer
30,414
182.82
US$3,951,409
30,414 182.82 US$3,951,409
2026-02-03 2026-02-02 S Sale

Head of Development

Officer
748 -10.7%
179.30
US$134,116
748 -10.7% 179.30 US$134,116
2026-02-03 2026-02-02 S Sale

Head of Development

Officer
748 -10.7%
179.30
US$134,116
748 -10.7% 179.30 US$134,116
2026-02-02 2026-02-02 PrS Proposed sale

Officer

Officer
748
179.30
US$134,116
748 179.30 US$134,116
2025-09-02 2025-09-02 PrS Proposed sale

Officer

Officer
517
133.55
US$69,045
517 133.55 US$69,045
2025-09-02 2025-09-02 S Sale

Head of Development

Officer
517 -8.2%
133.55
US$69,045
517 -8.2% 133.55 US$69,045
2025-07-16 2025-07-08 S Sale

Head of Global Product Strat.

Officer
2,223 -26.0%
135.00
US$300,105
2,223 -26.0% 135.00 US$300,105
2025-07-08 2025-07-08 PrS Proposed sale

Officer

Officer
2,223
135.00
US$300,105
2,223 135.00 US$300,105
2025-05-20 2025-05-19 PlS Planned sale

Head of Development

Officer
3,806 -41.2%
126.25
US$480,508
3,806 -41.2% 126.25 US$480,508
2025-05-19 2025-05-19 PrS Proposed sale

Officer

Officer
3,806
126.25
US$480,508
3,806 126.25 US$480,508
2025-05-05 2025-05-02 B Purchase Non-Executive Director
1,235 +4.6%
122.72
US$151,559
1,235 +4.6% 122.72 US$151,559
2025-03-10 2025-03-07 S Sale Non-Executive Director
8,760 -43.6%
150.02
US$1,314,142
8,760 -43.6% 150.02 US$1,314,142
2025-03-07 2025-03-07 PrS Proposed sale

Director

Non-Executive Director
8,760
147.37
US$1,290,961
8,760 147.37 US$1,290,961
2024-12-09 2024-12-09 PrS Proposed sale

Officer

Officer
110
157.21
US$17,293
110 157.21 US$17,293
2024-12-09 2024-12-09 S Sale

Head of Development

Officer
110 -2.0%
157.21
US$17,293
110 -2.0% 157.21 US$17,293
2024-09-05 2024-09-03 S Sale

Head of Development

Officer
431 -7.5%
204.22
US$88,019
431 -7.5% 204.22 US$88,019
2024-09-03 2024-09-03 PrS Proposed sale

Officer

Officer
431
204.22
US$88,019
431 204.22 US$88,019
2024-04-03 2024-04-02 PlS Planned sale

Head of Development

Officer
93 -1.9%
213.09
US$19,817
93 -1.9% 213.09 US$19,817
2024-04-02 2024-04-02 PrS Proposed sale

Officer

Officer
93
213.09
US$19,817
93 213.09 US$19,817
2024-02-26 2024-02-22 S Sale

Head of Development

Officer
262 -5.1%
221.23
US$57,962
262 -5.1% 221.23 US$57,962
2024-02-22 2024-02-22 PrS Proposed sale

Officer

Officer
262
221.23
US$57,962
262 221.23 US$57,962
2024-02-21 2024-02-21 PrS Proposed sale

Officer

Officer
108
221.49
US$23,921
108 221.49 US$23,921
2024-02-21 2024-02-16 S Sale

Head of Development

Officer
108 -2.1%
221.49
US$23,921
108 -2.1% 221.49 US$23,921
2024-02-20 2024-02-15 B Purchase Non-Executive Director
455 +2.3%
222.54
US$101,256
455 +2.3% 222.54 US$101,256
2024-02-13 2024-02-12 S Sale

Head of Development

Officer
419 -8.5%
239.45
US$100,330
419 -8.5% 239.45 US$100,330
2024-02-12 2024-02-12 PrS Proposed sale

Officer

Officer
419
239.45
US$100,330
419 239.45 US$100,330
2024-02-05 2024-02-02 S Sale

Head of Development

Officer
634 -13.4%
245.93
US$155,920
634 -13.4% 245.93 US$155,920
2024-02-02 2024-02-02 PrS Proposed sale

Officer

Officer
634
245.93
US$155,920
634 245.93 US$155,920
2023-12-12 2023-12-11 S Sale

Head of Development

Officer
110 -3.1%
248.00
US$27,280
110 -3.1% 248.00 US$27,280
2023-12-11 2023-12-11 PrS Proposed sale

Officer

Officer
110
248.00
US$27,280
110 248.00 US$27,280
2023-09-06 2023-09-05 S Sale

Head of Development

Officer
431 -11.4%
269.43
US$116,124
431 -11.4% 269.43 US$116,124
2023-09-05 2023-09-05 PrS Proposed sale

Officer

Officer
431
269.43
US$116,124
431 269.43 US$116,124
2023-07-05 2023-07-03 S Sale

Head of Development

Officer
81 -2.7%
282.87
US$22,912
81 -2.7% 282.87 US$22,912
2023-07-03 2023-07-03 PrS Proposed sale

Officer

Officer
81
282.87
US$22,912
81 282.87 US$22,912
2023-05-02 2023-04-28 PlS Planned sale

EVP, Human Resources

Officer
2,681 -24.0%
300.00
US$804,300
2,681 -24.0% 300.00 US$804,300
2023-04-28 2023-04-28 PrS Proposed sale

Officer

Officer
2,681
300.00
US$804,300
2,681 300.00 US$804,300
2023-04-06 2023-04-04 PlS Planned sale

Head of Development

Officer
91 -3.1%
277.11
US$25,217
91 -3.1% 277.11 US$25,217
2023-04-04 2023-04-04 PrS Proposed sale

Officer

Officer
91
277.11
US$25,217
91 277.11 US$25,217
2023-03-30 2023-03-28 PlS Planned sale

Head of Development

Officer
568 -16.7%
270.06
US$153,394
568 -16.7% 270.06 US$153,394
2023-03-28 2023-03-28 PrS Proposed sale

Officer

Officer
568
270.06
US$153,394
568 270.06 US$153,394
2022-12-12 2022-11-14 PlS Planned sale

EVP, Human Resources

Officer
5,610 -49.6%
300.11
US$1,683,617
5,610 -49.6% 300.11 US$1,683,617
2022-10-28 2022-10-27 PlS Planned sale

EVP Chief Legal Off & Corp Sec

Officer
5,532 -12.3%
280.70
US$1,552,832
5,532 -12.3% 280.70 US$1,552,832
2021-06-09 2021-06-07 PlS Planned sale

Head of Research & Development

Officer
7,672 -43.0%
440.00
US$3,375,680
7,672 -43.0% 440.00 US$3,375,680
2021-06-07 2021-06-04 PlS Planned sale Non-Executive Director
360 -4.6%
274.17
US$98,701
360 -4.6% 274.17 US$98,701
2021-02-10 2021-02-09 B Purchase Non-Executive Director
898 +43.9%
267.00
US$239,766
898 +43.9% 267.00 US$239,766
2020-12-01 2020-11-30 PP Planned purchase

Chief Executive Officer

Executive Director
3,100 +9.8%
241.31
US$748,047
3,100 +9.8% 241.31 US$748,047
2020-11-06 2020-11-04 PlS Planned sale

EVP, Research & Development

Officer
1,500 -10.3%
350.00
US$525,000
1,500 -10.3% 350.00 US$525,000
2020-03-12 2020-03-11 PlS Planned sale Non-Executive Director
270 -1.7%
295.29
US$79,728
270 -1.7% 295.29 US$79,728
2020-03-12 2020-03-11 PlS Planned sale Non-Executive Director
2,164 -13.1%
295.22
US$638,845
2,164 -13.1% 295.22 US$638,845
2019-12-03 2019-12-02 PlS Planned sale Posner Brian S Non-Executive Director
1,055 -13.1%
292.35
US$308,429
1,055 -13.1% 292.35 US$308,429
2019-05-02 2019-05-02 B Purchase Non-Executive Director
38,000 +6.3%
231.24
US$8,787,120
38,000 +6.3% 231.24 US$8,787,120
2019-05-02 2019-05-01 PP Planned purchase

Chief Executive Officer

Executive Director
4,351 +26.1%
231.48
US$1,007,169
4,351 +26.1% 231.48 US$1,007,169
2019-05-02 2019-05-01 B Purchase Non-Executive Director
30,000 +5.2%
229.46
US$6,883,800
30,000 +5.2% 229.46 US$6,883,800
2019-05-02 2019-04-30 B Purchase Non-Executive Director
50,342 +9.6%
229.25
US$11,540,904
50,342 +9.6% 229.25 US$11,540,904
2019-03-19 2019-03-18 PlS Planned sale
6,114 -24.8%
328.55
US$2,008,755
6,114 -24.8% 328.55 US$2,008,755
2019-02-01 2019-02-01 B Purchase Non-Executive Director
7,000 +1.4%
328.45
US$2,299,163
7,000 +1.4% 328.45 US$2,299,163
2019-02-01 2019-01-31 B Purchase Non-Executive Director
25,800 +5.2%
330.52
US$8,527,393
25,800 +5.2% 330.52 US$8,527,393
2019-02-01 2019-01-30 B Purchase Non-Executive Director
30,000 +6.5%
324.86
US$9,745,851
30,000 +6.5% 324.86 US$9,745,851
2018-09-27 2018-09-26 PlS Planned sale Ehlers Michael D

EVP, Research and Development

Officer
1,000 -18.9%
350.00
US$350,000
1,000 -18.9% 350.00 US$350,000
2018-04-27 2018-04-25 B Purchase DENNER ALEXANDER J Non-Executive Director
48,000 +11.6%
269.91
US$12,955,680
48,000 +11.6% 269.91 US$12,955,680
2018-02-28 2018-02-27 PlS Planned sale Sandrock Alfred

EVP, Chief Medical Officer

Officer
259 -3.8%
290.83
US$75,325
259 -3.8% 290.83 US$75,325
2018-02-27 2018-02-23 PlS Planned sale Sandrock Alfred

EVP, Chief Medical Officer

Officer
908 -12.2%
293.44
US$266,444
908 -12.2% 293.44 US$266,444
2018-02-21 2018-02-20 PlS Planned sale Sandrock Alfred

EVP, Chief Medical Officer

Officer
743 -10.2%
292.00
US$216,956
743 -10.2% 292.00 US$216,956
2018-02-20 2018-02-15 PlS Planned sale Sandrock Alfred

EVP, Chief Medical Officer

Officer
1,294 -15.1%
298.85
US$386,712
1,294 -15.1% 298.85 US$386,712
2018-01-10 2018-01-09 PlS Planned sale PANGIA ROBERT W Non-Executive Director
5,832 -24.8%
329.65
US$1,922,519
5,832 -24.8% 329.65 US$1,922,519
2018-01-02 2017-12-29 PP Planned purchase Vounatsos Michel

Chief Executive Officer

Executive Director
780 +19.0%
320.55
US$250,029
780 +19.0% 320.55 US$250,029
2017-11-30 2017-11-29 B Purchase DENNER ALEXANDER J
10,000 +2.5%
319.84
US$3,198,400
10,000 +2.5% 319.84 US$3,198,400
2017-11-30 2017-11-28 B Purchase DENNER ALEXANDER J
20,000 +5.2%
316.12
US$6,322,400
20,000 +5.2% 316.12 US$6,322,400
2017-07-26 2017-07-25 PlS Planned sale ALEXANDER SUSAN H

EVP Chief Legal Corp Svc & Sec

Officer
4,974 -18.3%
290.01
US$1,442,510
4,974 -18.3% 290.01 US$1,442,510
2017-07-20 2017-07-19 PlS Planned sale ALEXANDER SUSAN H

EVP Chief Legal Corp Svc & Sec

Officer
7,758 -22.2%
285.00
US$2,211,030
7,758 -22.2% 285.00 US$2,211,030
2017-06-12 2017-06-09 PlS Planned sale Posner Brian S
1,084 -14.6%
256.31
US$277,840
1,084 -14.6% 256.31 US$277,840
2017-05-02 2017-05-01 PP Planned purchase Vounatsos Michel

Chief Executive Officer

Executive Director
1,402 +91.9%
271.35
US$380,433
1,402 +91.9% 271.35 US$380,433
2017-05-01 2017-04-27 B Purchase DENNER ALEXANDER J Non-Executive Director
58,858 +18.1%
278.48
US$16,390,776
58,858 +18.1% 278.48 US$16,390,776