Group One Trading
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Group One Trading’s Biogen BIIB Stock Holding History

Group One Trading’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 		$2.55M Sell
13,900
-32,900
-70% -$6.06M ﹤0.01% 1861
2025
Q4 		$8.24M Buy
46,800
+29,900
+177% +$4.88M 0.01% 1081
2025
Q3 		$2.37M Sell
16,900
-164,800
-91% -$22.3M ﹤0.01% 2143
2025
Q2 		$22.8M Sell
181,700
-94,100
-34% -$11.7M 0.05% 372
2025
Q1 		$37.7M Buy
275,800
+227,000
+465% +$32.5M 0.11% 145
2024
Q4 		$7.46M Sell
48,800
-8,500
-15% -$1.43M 0.02% 877
2024
Q3 		$11.1M Buy
57,300
+1,200
+2% +$251K 0.03% 565
2024
Q2 		$13M Buy
56,100
+35,100
+167% +$7.63M 0.05% 323
2024
Q1 		$4.53M Sell
21,000
-2,200
-9% -$515K 0.02% 890
2023
Q4 		$6M Buy
23,200
+2,700
+13% +$663K 0.02% 1001
2023
Q3 		$5.27M Buy
20,500
+3,700
+22% +$990K 0.02% 917
2023
Q2 		$4.79M Sell
16,800
-10,500
-38% -$3.13M 0.02% 983
2023
Q1 		$7.59M Sell
27,300
-142,900
-84% -$39.5M 0.03% 624
2022
Q4 		$47.1M Sell
170,200
-278,700
-62% -$78.7M 0.11% 156
2022
Q3 		$120M Buy
448,900
+163,500
+57% +$34.7M 0.24% 44
2022
Q2 		$58.2M Buy
285,400
+95,500
+50% +$19.5M 0.09% 158
2022
Q1 		$40M Sell
189,900
-155,500
-45% -$33.8M 0.04% 320
2021
Q4 		$82.9M Buy
345,400
+117,000
+51% +$30.1M 0.07% 193
2021
Q3 		$64.6M Sell
228,400
-30,100
-12% -$9.87M 0.07% 210
2021
Q2 		$89.5M Sell
258,500
-81,400
-24% -$24.7M 0.11% 127
2021
Q1 		$95.1M Buy
339,900
+45,500
+15% +$12.3M 0.14% 99
2020
Q4 		$72.1M Buy
294,400
+98,800
+51% +$25.5M 0.12% 110
2020
Q3 		$55.5M Buy
195,600
+69,100
+55% +$19.3M 0.17% 86
2020
Q2 		$33.8M Sell
126,500
-1,600
-1% -$481K 0.16% 110
2020
Q1 		$40.5M Buy
128,100
+46,200
+56% +$14M 0.33% 45
2019
Q4 		$24.3M Buy
81,900
+65,800
+409% +$18.3M 0.17% 110
2019
Q3 		$3.75M Sell
16,100
-3,000
-16% -$699K 0.03% 762
2019
Q2 		$4.47M Sell
19,100
-3,200
-14% -$739K 0.04% 589
2019
Q1 		$5.27M Sell
22,300
-41,300
-65% -$13M 0.06% 400
2018
Q4 		$19.1M Buy
63,600
+12,400
+24% +$3.96M 0.17% 111
2018
Q3 		$18.1M Buy
51,200
+5,400
+12% +$1.86M 0.14% 132
2018
Q2 		$13.3M Sell
45,800
-800
-2% -$225K 0.11% 184
2018
Q1 		$12.8M Buy
46,600
+2,600
+6% +$807K 0.13% 157
2017
Q4 		$14M Buy
44,000
+16,000
+57% +$5.13M 0.1% 233
2017
Q3 		$8.77M Buy
28,000
+900
+3% +$267K 0.08% 302
2017
Q2 		$7.35M Buy
27,100
+1,000
+4% +$264K 0.08% 313
2017
Q1 		$7.14M Sell
26,100
-7,800
-23% -$2.21M 0.08% 282
2016
Q4 		$9.61M Buy
33,900
+7,900
+30% +$2.34M 0.09% 234
2016
Q3 		$8.14M Buy
26,000
+25,400
+4,233% +$7.52M 0.09% 238
2016
Q2 		$145K Buy
600
+200
+50% +$52.7K ﹤0.01% 2619
2016
Q1 		$104K Sell
400
-1,200
-75% -$317K ﹤0.01% 2788
2015
Q4 		$490K Sell
1,600
-5,900
-79% -$1.7M 0.01% 1831
2015
Q3 		$2.19M Buy
+7,500
New +$2.48M 0.03% 729

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

Group One Trading's BIIB Position: Q4 2025 in Review

Group One Trading sold out of Biogen (BIIB) in Q4 2025, closing a stake of 19,310 shares — an estimated $3.15M sold.

Group One Trading first reported a position in BIIB in Q3 2015 and held it in 27 quarters. The position peaked at $30.9M in Q3 2024. 997 funds tracked by Wall St. Rank hold BIIB as of Q4 2025.

  • Group One Trading reported no remaining Biogen position as of Q4 2025 after selling out during the quarter.
  • Group One Trading sold 19,310 Biogen shares in Q4 2025, an estimated $3.15M.
  • Group One Trading first reported a position in Biogen in Q3 2015 and held it in 27 quarters.
  • Group One Trading's Biogen position peaked at $30.9M in Q3 2024.
  • 997 funds tracked by Wall St. Rank held Biogen as of Q4 2025.

Based on Group One Trading's 13F filing for Q4 2025, filed 12 Feb 2026.