Janus Henderson Group
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Janus Henderson Group’s Biogen BIIB Stock Holding History

Janus Henderson Group’s Portfolio BIIB Stock Details BIIB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$3.48M Sell
18,975
-1,277
-6% -$235K ﹤0.01% 1090
2025
Q4 		$3.56M Buy
20,252
+1,992
+11% +$325K ﹤0.01% 1069
2025
Q3 		$2.56M Hold
18,260
– – ﹤0.01% 1212
2025
Q2 		$2.29M Sell
18,260
-2,568
-12% -$320K ﹤0.01% 1225
2025
Q1 		$2.88M Buy
20,828
+1,065
+5% +$152K ﹤0.01% 1097
2024
Q4 		$3.02M Sell
19,763
-3,266
-14% -$551K ﹤0.01% 1111
2024
Q3 		$4.46M Buy
23,029
+1,900
+9% +$397K ﹤0.01% 935
2024
Q2 		$4.9M Sell
21,129
-14,030
-40% -$3.05M ﹤0.01% 853
2024
Q1 		$7.58M Buy
35,159
+13,985
+66% +$3.28M ﹤0.01% 757
2023
Q4 		$5.48M Buy
21,174
+86
+0.4% +$21.1K ﹤0.01% 797
2023
Q3 		$5.42M Buy
21,088
+1,007
+5% +$269K ﹤0.01% 801
2023
Q2 		$5.72M Sell
20,081
-1,165
-5% -$347K ﹤0.01% 827
2023
Q1 		$5.91M Buy
21,246
+2,251
+12% +$623K ﹤0.01% 832
2022
Q4 		$5.26M Sell
18,995
-14,327
-43% -$4.05M ﹤0.01% 850
2022
Q3 		$8.9M Buy
33,322
+15,020
+82% +$3.19M ﹤0.01% 850
2022
Q2 		$3.73M Sell
18,302
-340,693
-95% -$69.6M ﹤0.01% 898
2022
Q1 		$75.6M Buy
358,995
+57,550
+19% +$12.5M 0.04% 384
2021
Q4 		$72.3M Buy
301,445
+164,593
+120% +$42.3M 0.03% 435
2021
Q3 		$38.7M Buy
136,852
+47,905
+54% +$15.7M 0.02% 622
2021
Q2 		$30.8M Buy
88,947
+14,746
+20% +$4.47M 0.01% 684
2021
Q1 		$20.8M Sell
74,201
-37,796
-34% -$10.2M 0.01% 762
2020
Q4 		$27.4M Sell
111,997
-7,933
-7% -$2.05M 0.01% 683
2020
Q3 		$34M Sell
119,930
-7,117
-6% -$1.99M 0.02% 592
2020
Q2 		$34M Buy
127,047
+47,633
+60% +$14.3M 0.02% 580
2020
Q1 		$25.1M Sell
79,414
-2,593
-3% -$787K 0.02% 620
2019
Q4 		$24.3M Buy
82,007
+2,669
+3% +$741K 0.01% 777
2019
Q3 		$18.5M Sell
79,338
-2,057
-3% -$479K 0.01% 843
2019
Q2 		$19M Buy
81,395
+3,281
+4% +$758K 0.01% 802
2019
Q1 		$18.5M Sell
78,114
-359,200
-82% -$113M 0.01% 800
2018
Q4 		$132M Sell
437,314
-78,806
-15% -$25.1M 0.08% 282
2018
Q3 		$182M Sell
516,120
-1,079,866
-68% -$372M 0.1% 244
2018
Q2 		$463M Buy
1,595,986
+30,353
+2% +$8.53M 0.26% 97
2018
Q1 		$429M Buy
1,565,633
+37,247
+2% +$11.6M 0.25% 105
2017
Q4 		$487M Buy
1,528,386
+88,235
+6% +$28.3M 0.3% 84
2017
Q3 		$451M Sell
1,440,151
-5,409
-0.4% -$1.6M 0.29% 89
2017
Q2 		$392M Buy
1,445,560
+1,414,707
+4,585% +$374M 0.27% 97
2017
Q1 		$8.44M Buy
30,853
+335
+1% +$94.7K 0.06% 301
2016
Q4 		$8.66M Buy
30,518
+2,444
+9% +$724K 0.06% 298
2016
Q3 		$8.79M Sell
28,074
-1,911
-6% -$566K 0.06% 285
2016
Q2 		$7.25M Sell
29,985
-2,061
-6% -$543K 0.06% 289
2016
Q1 		$8.34M Hold
32,046
– – 0.07% 283
2015
Q4 		$9.82M Hold
32,046
– – 0.08% 265
2015
Q3 		$9.34M Sell
32,046
-51,484
-62% -$17M 0.08% 261
2015
Q2 		$33.7M Sell
83,530
-28,320
-25% -$11.4M 0.27% 110
2015
Q1 		$47.2M Buy
111,850
+12,396
+12% +$4.89M 0.36% 68
2014
Q4 		$33.8M Buy
99,454
+260
+0.3% +$84.1K 0.24% 115
2014
Q3 		$32.8M Sell
99,194
-6,828
-6% -$2.25M 0.31% 73
2014
Q2 		$33.4M Sell
106,022
-45,082
-30% -$13.6M 0.31% 76
2014
Q1 		$46.2M Buy
151,104
+3,715
+3% +$1.18M 0.45% 47
2013
Q4 		$41.2M Sell
147,389
-14,477
-9% -$3.74M 0.42% 60
2013
Q3 		$39M Sell
161,866
-30,278
-16% -$6.78M 0.43% 56
2013
Q2 		$41.9M Buy
+192,144
New +$41.1M 0.49% 46

Other funds holding BIIB

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

Janus Henderson Group's BIIB Position: Q1 2026 in Review

Janus Henderson Group reduced its Biogen (BIIB) stake by 6.3% in Q1 2026, selling an estimated $235K and leaving 18,975 shares worth $3.48M. The position accounts for ﹤0.01% of the portfolio, ranked #1090.

Janus Henderson Group first reported a position in BIIB in Q2 2013 and has held it in 52 quarters since. The position peaked at $487M in Q4 2017. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Janus Henderson Group held 18,975 shares of Biogen worth $3.48M as of Q1 2026.
  • Janus Henderson Group sold 1,277 Biogen shares in Q1 2026, an estimated $235K.
  • Biogen made up ﹤0.01% of Janus Henderson Group's portfolio in Q1 2026, its #1090 holding.
  • Janus Henderson Group first reported a position in Biogen in Q2 2013 and has held it in 52 quarters since.
  • Janus Henderson Group's Biogen position peaked at $487M in Q4 2017.
  • 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Janus Henderson Group's 13F filing for Q1 2026, filed 15 May 2026.