Rafferty Asset Management’s Biogen BIIB Stock Holding History

Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake
Trade Value Portfolio Weight Portfolio Position
2026
Q1
$6.42M Sell
35,018
-13,541
-28% -$2.5M 0.03% 309
2025
Q4
$8.55M Sell
48,559
-110,068
-69% -$18M 0.03% 282
2025
Q3
$22.2M Sell
158,627
-21,813
-12% -$2.95M 0.07% 144
2025
Q2
$22.7M Sell
180,440
-335
-0.2% -$41.7K 0.07% 137
2025
Q1
$24.7M Sell
180,775
-8,745
-5% -$1.25M 0.11% 118
2024
Q4
$29M Buy
189,520
+29,319
+18% +$4.95M 0.1% 120
2024
Q3
$31.1M Buy
160,201
+8,906
+6% +$1.86M 0.11% 107
2024
Q2
$35.1M Buy
151,295
+38,479
+34% +$8.36M 0.13% 91
2024
Q1
$24.3M Buy
112,816
+16,934
+18% +$3.97M 0.09% 117
2023
Q4
$24.8M Buy
95,882
+13,335
+16% +$3.28M 0.1% 117
2023
Q3
$21.2M Buy
82,547
+17,754
+27% +$4.75M 0.12% 110
2023
Q2
$18.5M Buy
64,793
+5,628
+10% +$1.68M 0.1% 121
2023
Q1
$16.4M Buy
59,165
+2,794
+5% +$773K 0.11% 123
2022
Q4
$15.6M Sell
56,371
-16,459
-23% -$4.65M 0.13% 122
2022
Q3
$19.4M Buy
72,830
+17,895
+33% +$3.8M 0.21% 80
2022
Q2
$11.2M Sell
54,935
-8,299
-13% -$1.7M 0.1% 120
2022
Q1
$13.3M Buy
63,234
+18,274
+41% +$3.97M 0.08% 152
2021
Q4
$10.8M Buy
44,960
+15,793
+54% +$4.06M 0.06% 174
2021
Q3
$8.25M Buy
29,167
+9,718
+50% +$3.19M 0.06% 191
2021
Q2
$6.74M Sell
19,449
-9,647
-33% -$2.92M 0.04% 251
2021
Q1
$8.14M Buy
29,096
+7,355
+34% +$1.98M 0.06% 192
2020
Q4
$5.32M Buy
21,741
+857
+4% +$221K 0.05% 206
2020
Q3
$5.92M Buy
20,884
+2,815
+16% +$785K 0.07% 163
2020
Q2
$4.83M Buy
18,069
+6,856
+61% +$2.06M 0.07% 176
2020
Q1
$3.55M Sell
11,213
-14,833
-57% -$4.5M 0.15% 81
2019
Q4
$7.73M Sell
26,046
-10,611
-29% -$2.94M 0.12% 98
2019
Q3
$8.53M Sell
36,657
-3,439
-9% -$801K 0.13% 83
2019
Q2
$9.38M Buy
40,096
+11,237
+39% +$2.59M 0.16% 70
2019
Q1
$6.82M Buy
28,859
+23,281
+417% +$7.33M 0.11% 99
2018
Q4
$1.68M Sell
5,578
-491
-8% -$157K 0.04% 248
2018
Q3
$2.14M Sell
6,069
-8,598
-59% -$2.96M 0.03% 277
2018
Q2
$4.26M Buy
14,667
+5,752
+65% +$1.62M 0.06% 156
2018
Q1
$2.44M Buy
8,915
+4,383
+97% +$1.36M 0.04% 240
2017
Q4
$1.44M Sell
4,532
-335
-7% -$107K 0.02% 354
2017
Q3
$1.52M Sell
4,867
-814
-14% -$241K 0.03% 317
2017
Q2
$1.54M Buy
5,681
+1,516
+36% +$401K 0.04% 245
2017
Q1
$1.14M Buy
4,165
+649
+18% +$184K 0.03% 321
2016
Q4
$997K Buy
3,516
+1,104
+46% +$327K 0.05% 199
2016
Q3
$755K Sell
2,412
-56
-2% -$16.6K 0.03% 232
2016
Q2
$0 Sell
2,468
-638
-21% -$168K ﹤0.01% 508
2016
Q1
$809K Sell
3,106
-6,171
-67% -$1.63M 0.04% 283
2015
Q4
$2.86M Buy
9,277
+1,533
+20% +$441K 0.34% 61
2015
Q3
$2.26M Buy
7,744
+5,205
+205% +$1.72M 0.18% 118
2015
Q2
$1.03M Sell
2,539
-231
-8% -$92.7K 0.07% 218
2015
Q1
$1.17M Buy
2,770
+1,154
+71% +$455K 0.09% 205
2014
Q4
$549K Buy
1,616
+296
+22% +$95.8K 0.12% 175
2014
Q3
$437K Buy
1,320
+557
+73% +$184K 0.05% 174
2014
Q2
$241K Sell
763
-520
-41% -$157K 0.05% 279
2014
Q1
$392K Sell
1,283
-161
-11% -$51.1K 0.08% 113
2013
Q4
$404K Buy
+1,444
New +$373K 0.1% 129

Other funds holding BIIB

Rafferty Asset Management's BIIB Position: Q1 2026 in Review

Rafferty Asset Management reduced its Biogen (BIIB) stake by 28% in Q1 2026, selling an estimated $2.5M and leaving 35,018 shares worth $6.42M. The position accounts for 0.03% of the portfolio, ranked #309.

Rafferty Asset Management first reported a position in BIIB in Q4 2013 and has held it in 50 quarters since. The position peaked at $35.1M in Q2 2024. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Rafferty Asset Management held 35,018 shares of Biogen worth $6.42M as of Q1 2026.
  • Rafferty Asset Management sold 13,541 Biogen shares in Q1 2026, an estimated $2.5M.
  • Biogen made up 0.03% of Rafferty Asset Management's portfolio in Q1 2026, its #309 holding.
  • Rafferty Asset Management first reported a position in Biogen in Q4 2013 and has held it in 50 quarters since.
  • Rafferty Asset Management's Biogen position peaked at $35.1M in Q2 2024.
  • 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Rafferty Asset Management's 13F filing for Q1 2026, filed 15 May 2026.