Simplex Trading
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Simplex Trading’s Biogen BIIB Stock Holding History

Simplex 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 		$6.4M Sell
34,900
-87,400
-71% -$16.1M ﹤0.01% 952
2025
Q4 		$21.5M Buy
122,300
+92,800
+315% +$15.2M 0.01% 533
2025
Q3 		$4.13M Sell
29,500
-1,100
-4% -$149K ﹤0.01% 1647
2025
Q2 		$3.84M Sell
30,600
-77,200
-72% -$9.62M ﹤0.01% 1567
2025
Q1 		$14.8M Buy
107,800
+21,500
+25% +$3.07M 0.01% 663
2024
Q4 		$13.2M Sell
86,300
-28,700
-25% -$4.84M 0.01% 868
2024
Q3 		$22.3M Sell
115,000
-5,100
-4% -$1.07M 0.01% 600
2024
Q2 		$27.8M Buy
120,100
+45,400
+61% +$9.87M 0.02% 481
2024
Q1 		$16.1M Sell
74,700
-36,800
-33% -$8.62M 0.01% 827
2023
Q4 		$28.9M Buy
111,500
+800
+0.7% +$196K 0.02% 551
2023
Q3 		$28.5M Buy
110,700
+6,000
+6% +$1.6M 0.02% 453
2023
Q2 		$29.8M Sell
104,700
-32,900
-24% -$9.79M 0.02% 420
2023
Q1 		$38.3M Sell
137,600
-44,100
-24% -$12.2M 0.03% 345
2022
Q4 		$50.3M Sell
181,700
-41,700
-19% -$11.8M 0.05% 269
2022
Q3 		$59.6M Buy
223,400
+85,400
+62% +$18.1M 0.07% 205
2022
Q2 		$28.1M Buy
138,000
+20,100
+17% +$4.11M 0.03% 387
2022
Q1 		$24.8M Buy
117,900
+23,700
+25% +$5.15M 0.02% 463
2021
Q4 		$22.6M Sell
94,200
-98,900
-51% -$25.4M 0.02% 464
2021
Q3 		$67.4M Buy
193,100
+3,600
+2% +$1.18M 0.06% 207
2021
Q2 		$65.6M Buy
+189,500
New +$57.4M 0.06% 204
2021
Q1 		– Sell
-2,424
Closed -$59.4M – 8823
2020
Q4 		$59.4M Buy
2,424
+767
+46% +$198K 0.08% 150
2020
Q3 		$47M Sell
1,657
-247
-13% -$68.9K 0.06% 170
2020
Q2 		$50.9M Buy
1,904
+282
+17% +$84.8K 0.08% 138
2020
Q1 		$51.3M Sell
1,622
-163
-9% -$49.5K 0.09% 111
2019
Q4 		$53M Sell
1,785
-1,013
-36% -$281K 0.12% 99
2019
Q3 		$65.1M Buy
2,798
+491
+21% +$114K 0.19% 69
2019
Q2 		$54M Buy
2,307
+408
+21% +$94.2K 0.15% 72
2019
Q1 		$44.9M Buy
1,899
+913
+93% +$287K 0.12% 106
2018
Q4 		$29.7M Sell
986
-396
-29% -$126K 0.09% 142
2018
Q3 		$48.8M Buy
1,382
+329
+31% +$113K 0.16% 83
2018
Q2 		$30.6M Buy
1,053
+189
+22% +$53.1K 0.12% 120
2018
Q1 		$910K Sell
864
-762
-47% -$237K 0.04% 429
2017
Q4 		$801K Buy
1,626
+366
+29% +$117K 0.03% 491
2017
Q3 		$920K Sell
1,260
-377
-23% -$112K 0.04% 404
2017
Q2 		$1.17M Sell
1,637
-139
-8% -$36.8K 0.05% 311
2017
Q1 		$1.47M Buy
1,776
+661
+59% +$187K 0.06% 271
2016
Q4 		$1.51M Buy
1,115
+4
+0.4% +$1.19K 0.09% 177
2016
Q3 		$832K Sell
1,111
-1,219
-52% -$361K 0.06% 315
2016
Q2 		$2.54M Buy
2,330
+1,373
+143% +$362K 0.17% 99
2016
Q1 		$3.14M Sell
957
-392
-29% -$104K 0.25% 68
2015
Q4 		$2.72M Sell
1,349
-1,159
-46% -$333K 0.21% 78
2015
Q3 		$6.14M Buy
2,508
+1,289
+106% +$426K 0.45% 37
2015
Q2 		$1.95M Buy
1,219
+110
+10% +$44.1K 0.16% 100
2015
Q1 		$851K Sell
1,109
-106
-9% -$41.8K 0.1% 194
2014
Q4 		$760K Buy
+1,215
New +$393K 0.09% 179

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

Simplex Trading's BIIB Position: Q1 2026 in Review

Simplex Trading reduced its Biogen (BIIB) stake by 93% in Q1 2026, selling an estimated $5.29M and leaving 2,164 shares worth $397K. The position accounts for ﹤0.01% of the portfolio, ranked #3540.

Simplex Trading first reported a position in BIIB in Q1 2015 and has held it in 24 quarters since. The position peaked at $15.8M in Q3 2019. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Simplex Trading held 2,164 shares of Biogen worth $397K as of Q1 2026.
  • Simplex Trading sold 28,714 Biogen shares in Q1 2026, an estimated $5.29M.
  • Biogen made up ﹤0.01% of Simplex Trading's portfolio in Q1 2026, its #3540 holding.
  • Simplex Trading first reported a position in Biogen in Q1 2015 and has held it in 24 quarters since.
  • Simplex Trading's Biogen position peaked at $15.8M in Q3 2019.
  • 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.