Twin Tree Management
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Twin Tree Management’s Biogen BIIB Stock Holding History

Twin Tree Management’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 		$5.39M Sell
29,400
-44,900
-60% -$8.27M 0.11% 206
2025
Q4 		$13.1M Buy
74,300
+50,200
+208% +$8.2M 0.11% 222
2025
Q3 		$3.38M Buy
24,100
+17,400
+260% +$2.35M 0.01% 889
2025
Q2 		$841K Sell
6,700
-3,800
-36% -$473K ﹤0.01% 1382
2025
Q1 		$1.44M Buy
10,500
+700
+7% +$100K ﹤0.01% 1208
2024
Q4 		$1.5M Sell
9,800
-3,200
-25% -$540K ﹤0.01% 1211
2024
Q3 		$2.52M Buy
+13,000
New +$2.72M ﹤0.01% 1086
2024
Q2 		– Sell
-7,000
Closed -$1.51M – 1350
2024
Q1 		$1.51M Sell
7,000
-24,400
-78% -$5.71M ﹤0.01% 1020
2023
Q4 		$8.13M Buy
+31,400
New +$7.71M 0.02% 746
2023
Q2 		– Sell
-39,000
Closed -$10.8M – 1253
2023
Q1 		$10.8M Sell
39,000
-181,200
-82% -$50.1M 0.02% 557
2022
Q4 		$61M Sell
220,200
-2,500
-1% -$706K 0.13% 141
2022
Q3 		$59.5M Sell
222,700
-129,300
-37% -$27.5M 0.11% 148
2022
Q2 		$71.8M Buy
352,000
+257,300
+272% +$52.6M 0.11% 119
2022
Q1 		$19.9M Buy
94,700
+48,500
+105% +$10.5M 0.03% 464
2021
Q4 		$11.1M Sell
46,200
-7,500
-14% -$1.93M 0.02% 598
2021
Q3 		$15.2M Buy
53,700
+3,300
+7% +$1.08M 0.03% 454
2021
Q2 		$17.5M Sell
50,400
-17,200
-25% -$5.21M 0.05% 366
2021
Q1 		$18.9M Hold
67,600
– – 0.07% 290
2020
Q4 		$16.6M Sell
67,600
-251,000
-79% -$64.8M 0.07% 321
2020
Q3 		$90.4M Buy
318,600
+20,200
+7% +$5.63M 0.37% 48
2020
Q2 		$79.8M Buy
298,400
+96,200
+48% +$28.9M 0.32% 50
2020
Q1 		$64M Buy
202,200
+73,100
+57% +$22.2M 0.31% 47
2019
Q4 		$38.3M Sell
129,100
-152,600
-54% -$42.3M 0.13% 129
2019
Q3 		$65.6M Sell
281,700
-9,100
-3% -$2.12M 0.26% 59
2019
Q2 		$68M Sell
290,800
-28,500
-9% -$6.58M 0.33% 51
2019
Q1 		$75.5M Buy
319,300
+223,700
+234% +$70.4M 0.39% 48
2018
Q4 		$28.8M Sell
95,600
-37,800
-28% -$12.1M 0.18% 97
2018
Q3 		$47.1M Buy
133,400
+43,500
+48% +$15M 0.32% 48
2018
Q2 		$26.1M Hold
89,900
– – 0.16% 115
2018
Q1 		$24.6M Buy
89,900
+53,200
+145% +$16.5M 0.2% 76
2017
Q4 		$11.7M Sell
36,700
-9,100
-20% -$2.92M 0.09% 203
2017
Q3 		$14.3M Sell
45,800
-97,700
-68% -$28.9M 0.11% 175
2017
Q2 		$38.9M Buy
+143,500
New +$37.9M 0.3% 62
2017
Q1 		– Sell
-59,400
Closed -$16.8M – 1017
2016
Q4 		$16.8M Buy
59,400
+11,900
+25% +$3.53M 0.16% 147
2016
Q3 		$14.9M Sell
47,500
-4,600
-9% -$1.36M 0.19% 111
2016
Q2 		$12.6M Buy
52,100
+28,200
+118% +$7.43M 0.2% 106
2016
Q1 		$6.22M Sell
23,900
-56,200
-70% -$14.8M 0.12% 187
2015
Q4 		$24.5M Buy
80,100
+20,900
+35% +$6.01M 0.49% 19
2015
Q3 		$17.3M Buy
59,200
+12,600
+27% +$4.16M 0.44% 20
2015
Q2 		$18.8M Sell
46,600
-3,900
-8% -$1.57M 0.46% 27
2015
Q1 		$21.3M Buy
50,500
+13,400
+36% +$5.28M 0.55% 19
2014
Q4 		$12.6M Sell
37,100
-6,400
-15% -$2.07M 0.35% 44
2014
Q3 		$14.4M Sell
43,500
-8,600
-17% -$2.84M 0.38% 34
2014
Q2 		$16.4M Buy
52,100
+12,700
+32% +$3.82M 0.37% 30
2014
Q1 		$12.1M Sell
39,400
-700
-2% -$222K 0.24% 61
2013
Q4 		$11.2M Buy
40,100
+31,100
+346% +$8.04M 0.27% 50
2013
Q3 		$2.17M Sell
9,000
-3,100
-26% -$694K 0.07% 302
2013
Q2 		$2.6M Buy
+12,100
New +$2.59M 0.1% 238

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

Twin Tree Management's BIIB Position: Q1 2026 in Review

Twin Tree Management reduced its Biogen (BIIB) stake by 94% in Q1 2026, selling an estimated $2.12M and leaving 759 shares worth $139K. The position accounts for ﹤0.01% of the portfolio, ranked #1132.

Twin Tree Management first reported a position in BIIB in Q2 2013 and has held it in 36 quarters since. The position peaked at $30.4M in Q3 2022. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Twin Tree Management held 759 shares of Biogen worth $139K as of Q1 2026.
  • Twin Tree Management sold 11,511 Biogen shares in Q1 2026, an estimated $2.12M.
  • Biogen made up ﹤0.01% of Twin Tree Management's portfolio in Q1 2026, its #1132 holding.
  • Twin Tree Management first reported a position in Biogen in Q2 2013 and has held it in 36 quarters since.
  • Twin Tree Management's Biogen position peaked at $30.4M in Q3 2022.
  • 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Twin Tree Management's 13F filing for Q1 2026, filed 14 May 2026.