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 		$10.8M Sell
59,000
-117,800
-67% -$21.7M 0.02% 800
2025
Q4 		$31.1M Buy
176,800
+25,300
+17% +$4.13M 0.05% 350
2025
Q3 		$21.2M Sell
151,500
-68,100
-31% -$9.21M 0.04% 471
2025
Q2 		$27.6M Sell
219,600
-37,300
-15% -$4.65M 0.06% 315
2025
Q1 		$35.2M Buy
256,900
+16,500
+7% +$2.36M 0.1% 159
2024
Q4 		$36.8M Buy
240,400
+179,800
+297% +$30.3M 0.08% 195
2024
Q3 		$11.7M Sell
60,600
-10,400
-15% -$2.18M 0.03% 527
2024
Q2 		$16.5M Buy
71,000
+32,800
+86% +$7.13M 0.06% 264
2024
Q1 		$8.24M Sell
38,200
-11,100
-23% -$2.6M 0.03% 535
2023
Q4 		$12.8M Buy
49,300
+500
+1% +$123K 0.03% 554
2023
Q3 		$12.5M Buy
48,800
+6,500
+15% +$1.74M 0.04% 405
2023
Q2 		$12M Buy
42,300
+7,100
+20% +$2.11M 0.04% 423
2023
Q1 		$9.79M Sell
35,200
-241,100
-87% -$66.7M 0.04% 473
2022
Q4 		$76.5M Sell
276,300
-78,300
-22% -$22.1M 0.18% 89
2022
Q3 		$94.7M Buy
354,600
+156,100
+79% +$33.2M 0.19% 61
2022
Q2 		$40.5M Buy
198,500
+43,800
+28% +$8.95M 0.06% 237
2022
Q1 		$32.6M Sell
154,700
-64,300
-29% -$14M 0.03% 396
2021
Q4 		$52.5M Buy
219,000
+21,300
+11% +$5.48M 0.04% 295
2021
Q3 		$55.9M Sell
197,700
-65,300
-25% -$21.4M 0.06% 258
2021
Q2 		$91.1M Sell
263,000
-57,300
-18% -$17.4M 0.11% 123
2021
Q1 		$89.6M Sell
320,300
-143,900
-31% -$38.8M 0.13% 106
2020
Q4 		$114M Buy
464,200
+128,800
+38% +$33.2M 0.2% 57
2020
Q3 		$95.1M Buy
335,400
+40,600
+14% +$11.3M 0.3% 35
2020
Q2 		$78.9M Sell
294,800
-72,500
-20% -$21.8M 0.36% 27
2020
Q1 		$116M Buy
367,300
+307,300
+512% +$93.3M 0.94% 7
2019
Q4 		$17.8M Buy
60,000
+36,600
+156% +$10.2M 0.12% 177
2019
Q3 		$5.45M Sell
23,400
-70,800
-75% -$16.5M 0.04% 530
2019
Q2 		$22M Sell
94,200
-3,200
-3% -$739K 0.2% 77
2019
Q1 		$23M Buy
97,400
+47,100
+94% +$14.8M 0.26% 51
2018
Q4 		$15.1M Buy
50,300
+23,000
+84% +$7.34M 0.13% 144
2018
Q3 		$9.64M Buy
27,300
+9,400
+53% +$3.24M 0.08% 297
2018
Q2 		$5.2M Sell
17,900
-6,600
-27% -$1.86M 0.04% 526
2018
Q1 		$6.71M Buy
24,500
+3,100
+14% +$962K 0.07% 346
2017
Q4 		$6.82M Sell
21,400
-11,400
-35% -$3.66M 0.05% 489
2017
Q3 		$10.3M Buy
32,800
+3,600
+12% +$1.07M 0.09% 263
2017
Q2 		$7.92M Sell
29,200
-26,200
-47% -$6.93M 0.08% 287
2017
Q1 		$15.1M Buy
55,400
+25,000
+82% +$7.07M 0.18% 107
2016
Q4 		$8.62M Buy
30,400
+23,700
+354% +$7.03M 0.08% 264
2016
Q3 		$2.1M Buy
6,700
+6,600
+6,600% +$1.95M 0.02% 822
2016
Q2 		$24K Hold
100
– – ﹤0.01% 3702
2016
Q1 		$26K Sell
100
-2,400
-96% -$634K ﹤0.01% 3612
2015
Q4 		$766K Sell
2,500
-3,800
-60% -$1.09M 0.01% 1499
2015
Q3 		$1.84M Buy
+6,300
New +$2.08M 0.03% 834

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.