T. Rowe Price Associates
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T. Rowe Price Associates’s Biogen BIIB Stock Holding History

Quarter Market Value Status Shares Shares
Change %
Trade Value Portfolio Weight Portfolio Position
2025
Q2
$105M Sell
833,927
-317,265
-28% -$39.8M 0.01% 562
2025
Q1
$158M Sell
1,151,192
-782,524
-40% -$107M 0.02% 474
2024
Q4
$296M Buy
1,933,716
+21,170
+1% +$3.24M 0.03% 354
2024
Q3
$371M Sell
1,912,546
-98,865
-5% -$19.2M 0.04% 324
2024
Q2
$466M Buy
2,011,411
+421,782
+27% +$97.8M 0.06% 284
2024
Q1
$343M Buy
1,589,629
+81,283
+5% +$17.5M 0.04% 335
2023
Q4
$390M Buy
1,508,346
+344,816
+30% +$89.2M 0.05% 293
2023
Q3
$299M Buy
1,163,530
+34,888
+3% +$8.97M 0.04% 319
2023
Q2
$321M Sell
1,128,642
-959,714
-46% -$273M 0.04% 305
2023
Q1
$581M Buy
2,088,356
+691,843
+50% +$192M 0.09% 226
2022
Q4
$387M Sell
1,396,513
-138,002
-9% -$38.2M 0.06% 271
2022
Q3
$410M Buy
1,534,515
+503,584
+49% +$134M 0.07% 252
2022
Q2
$210M Sell
1,030,931
-45,038
-4% -$9.19M 0.03% 466
2022
Q1
$227M Sell
1,075,969
-55,388
-5% -$11.7M 0.02% 493
2021
Q4
$271M Sell
1,131,357
-652,779
-37% -$157M 0.02% 476
2021
Q3
$505M Buy
1,784,136
+171,573
+11% +$48.6M 0.05% 343
2021
Q2
$558M Sell
1,612,563
-164,608
-9% -$57M 0.05% 321
2021
Q1
$497M Buy
1,777,171
+89,873
+5% +$25.1M 0.05% 338
2020
Q4
$413M Buy
1,687,298
+316,017
+23% +$77.4M 0.04% 368
2020
Q3
$389M Buy
1,371,281
+163,403
+14% +$46.4M 0.05% 341
2020
Q2
$323M Sell
1,207,878
-3,076,679
-72% -$823M 0.04% 362
2020
Q1
$1.36B Buy
4,284,557
+2,272,645
+113% +$719M 0.21% 101
2019
Q4
$597M Buy
2,011,912
+907,258
+82% +$269M 0.08% 272
2019
Q3
$257M Buy
1,104,654
+6,884
+0.6% +$1.6M 0.04% 398
2019
Q2
$257M Buy
1,097,770
+45,881
+4% +$10.7M 0.04% 406
2019
Q1
$249M Sell
1,051,889
-232,117
-18% -$54.9M 0.04% 412
2018
Q4
$386M Sell
1,284,006
-499,136
-28% -$150M 0.07% 280
2018
Q3
$630M Sell
1,783,142
-190,489
-10% -$67.3M 0.09% 226
2018
Q2
$573M Sell
1,973,631
-2,048,468
-51% -$595M 0.09% 225
2018
Q1
$1.1B Sell
4,022,099
-4,512,212
-53% -$1.24B 0.18% 130
2017
Q4
$2.72B Sell
8,534,311
-2,147,067
-20% -$684M 0.44% 43
2017
Q3
$3.34B Buy
10,681,378
+1,732,596
+19% +$543M 0.57% 30
2017
Q2
$2.43B Buy
8,948,782
+830,591
+10% +$225M 0.44% 45
2017
Q1
$2.22B Sell
8,118,191
-600,042
-7% -$164M 0.42% 49
2016
Q4
$2.47B Buy
8,718,233
+1,108,205
+15% +$314M 0.49% 41
2016
Q3
$2.38B Buy
7,610,028
+1,243,876
+20% +$389M 0.48% 43
2016
Q2
$1.54B Sell
6,366,152
-1,753,757
-22% -$424M 0.33% 65
2016
Q1
$2.11B Buy
8,119,909
+1,759,477
+28% +$458M 0.45% 42
2015
Q4
$1.95B Buy
6,360,432
+333,346
+6% +$102M 0.41% 53
2015
Q3
$1.76B Sell
6,027,086
-4,446,701
-42% -$1.3B 0.39% 55
2015
Q2
$4.23B Sell
10,473,787
-317,775
-3% -$128M 0.87% 16
2015
Q1
$4.56B Sell
10,791,562
-1,384,986
-11% -$585M 0.94% 13
2014
Q4
$4.13B Sell
12,176,548
-614,504
-5% -$209M 0.88% 13
2014
Q3
$4.23B Buy
12,791,052
+596,411
+5% +$197M 0.92% 11
2014
Q2
$3.85B Buy
12,194,641
+16,492
+0.1% +$5.2M 0.83% 13
2014
Q1
$3.72B Buy
12,178,149
+527,011
+5% +$161M 0.84% 9
2013
Q4
$3.26B Buy
11,651,138
+823,942
+8% +$230M 0.75% 13
2013
Q3
$2.61B Sell
10,827,196
-120,921
-1% -$29.1M 0.65% 19
2013
Q2
$2.36B Buy
+10,948,117
New +$2.36B 0.63% 19