Vanguard Group’s Biogen BIIB Stock Holding History

Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake
Trade Value Portfolio Weight Portfolio Position
2025
Q4
$3.07B Buy
17,447,092
+157,857
+0.9% +$25.8M 0.04% 369
2025
Q3
$2.42B Sell
17,289,235
-1,416
-0% -$191K 0.04% 430
2025
Q2
$2.17B Buy
17,290,651
+257,812
+2% +$32.1M 0.04% 441
2025
Q1
$2.33B Buy
17,032,839
+283,964
+2% +$40.6M 0.04% 409
2024
Q4
$2.56B Buy
16,748,875
+70,368
+0.4% +$11.9M 0.04% 394
2024
Q3
$3.23B Buy
16,678,507
+78,344
+0.5% +$16.4M 0.06% 327
2024
Q2
$3.85B Buy
16,600,163
+29,765
+0.2% +$6.47M 0.07% 267
2024
Q1
$3.57B Buy
16,570,398
+2,163,068
+15% +$507M 0.07% 288
2023
Q4
$3.73B Buy
14,407,330
+2,218,744
+18% +$545M 0.08% 244
2023
Q3
$3.13B Sell
12,188,586
-7,850
-0.1% -$2.1M 0.08% 257
2023
Q2
$3.47B Buy
12,196,436
+38,774
+0.3% +$11.5M 0.08% 242
2023
Q1
$3.38B Buy
12,157,662
+181,039
+2% +$50.1M 0.09% 250
2022
Q4
$3.32B Buy
11,976,623
+61,650
+0.5% +$17.4M 0.09% 234
2022
Q3
$3.18B Buy
11,914,973
+54,951
+0.5% +$11.7M 0.09% 223
2022
Q2
$2.42B Buy
11,860,022
+139,438
+1% +$28.5M 0.07% 302
2022
Q1
$2.47B Buy
11,720,584
+183,285
+2% +$39.9M 0.06% 358
2021
Q4
$2.77B Sell
11,537,299
-154,577
-1% -$39.7M 0.06% 329
2021
Q3
$3.31B Sell
11,691,876
-61,457
-0.5% -$20.1M 0.08% 247
2021
Q2
$4.07B Sell
11,753,333
-100,325
-0.8% -$30.4M 0.1% 182
2021
Q1
$3.32B Sell
11,853,658
-42,852
-0.4% -$11.6M 0.09% 212
2020
Q4
$2.91B Sell
11,896,510
-451,562
-4% -$116M 0.08% 236
2020
Q3
$3.5B Sell
12,348,072
-528,035
-4% -$147M 0.12% 155
2020
Q2
$3.45B Sell
12,876,107
-1,362,120
-10% -$409M 0.12% 149
2020
Q1
$4.5B Buy
14,238,227
+367,689
+3% +$112M 0.19% 98
2019
Q4
$4.12B Sell
13,870,538
-224,988
-2% -$62.4M 0.14% 130
2019
Q3
$3.28B Sell
14,095,526
-719,828
-5% -$168M 0.12% 168
2019
Q2
$3.46B Sell
14,815,354
-200,117
-1% -$46.2M 0.13% 145
2019
Q1
$3.55B Sell
15,015,471
-155,136
-1% -$48.9M 0.14% 138
2018
Q4
$4.57B Buy
15,170,607
+356,482
+2% +$114M 0.21% 88
2018
Q3
$5.23B Sell
14,814,125
-483,799
-3% -$167M 0.2% 84
2018
Q2
$4.44B Buy
15,297,924
+168,681
+1% +$47.4M 0.19% 93
2018
Q1
$4.14B Buy
15,129,243
+258,224
+2% +$80.2M 0.18% 100
2017
Q4
$4.74B Buy
14,871,019
+202,077
+1% +$64.8M 0.21% 85
2017
Q3
$4.59B Buy
14,668,942
+134,115
+0.9% +$39.7M 0.21% 83
2017
Q2
$3.94B Buy
14,534,827
+182,337
+1% +$48.2M 0.19% 94
2017
Q1
$3.92B Buy
14,352,490
+342,568
+2% +$96.9M 0.2% 87
2016
Q4
$3.97B Buy
14,009,922
+163,866
+1% +$48.6M 0.22% 79
2016
Q3
$4.33B Buy
13,846,056
+301,440
+2% +$89.3M 0.25% 65
2016
Q2
$3.28B Buy
13,544,616
+182,714
+1% +$48.2M 0.2% 93
2016
Q1
$3.48B Buy
13,361,902
+133,400
+1% +$35.2M 0.23% 80
2015
Q4
$4.05B Sell
13,228,502
-349,032
-3% -$100M 0.27% 62
2015
Q3
$3.96B Buy
13,577,534
+196,139
+1% +$64.8M 0.29% 59
2015
Q2
$5.41B Buy
13,381,395
+239,059
+2% +$95.9M 0.37% 46
2015
Q1
$5.55B Buy
13,142,336
+411,642
+3% +$162M 0.38% 46
2014
Q4
$4.32B Buy
12,730,694
+395,460
+3% +$128M 0.31% 51
2014
Q3
$4.08B Buy
12,335,234
+248,937
+2% +$82.1M 0.32% 50
2014
Q2
$3.81B Buy
12,086,297
+187,167
+2% +$56.3M 0.3% 56
2014
Q1
$3.64B Buy
11,899,130
+275,477
+2% +$87.4M 0.31% 52
2013
Q4
$3.25B Buy
11,623,653
+105,771
+0.9% +$27.4M 0.29% 60
2013
Q3
$2.77B Buy
11,517,882
+169,709
+1% +$38M 0.27% 67
2013
Q2
$2.44B Buy
+11,348,173
New +$2.42B 0.26% 67

Other funds holding BIIB

Vanguard Group's BIIB Position: Q4 2025 in Review

Vanguard Group increased its Biogen (BIIB) stake by 0.91% in Q4 2025, buying an estimated $25.8M and bringing the position to 17,447,092 shares worth $3.07B. The position accounts for 0.04% of the portfolio, ranked #369.

Vanguard Group first reported a position in BIIB in Q2 2013 and has held it in 51 quarters since. The position peaked at $5.55B in Q1 2015. 1,001 funds tracked by Wall St. Rank hold BIIB as of Q4 2025.

  • Vanguard Group held 17,447,092 shares of Biogen worth $3.07B as of Q4 2025.
  • Vanguard Group bought 157,857 Biogen shares in Q4 2025, an estimated $25.8M.
  • Biogen made up 0.04% of Vanguard Group's portfolio in Q4 2025, its #369 holding.
  • Vanguard Group first reported a position in Biogen in Q2 2013 and has held it in 51 quarters since.
  • Vanguard Group's Biogen position peaked at $5.55B in Q1 2015.
  • 1,001 funds tracked by Wall St. Rank held Biogen as of Q4 2025.

Based on Vanguard Group's 13F filing for Q4 2025, filed 29 Jan 2026.