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Boothbay Fund Management’s Biogen BIIB Stock Holding History

Boothbay Fund 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 		$2.62M Buy
+14,268
New +$2.63M 0.03% 517
2025
Q4 		– Sell
-5,500
Closed -$770K – 1981
2025
Q3 		$770K Sell
5,500
-5,422
-50% -$733K 0.01% 946
2025
Q2 		$1.37M Buy
10,922
+9,112
+503% +$1.14M 0.03% 595
2025
Q1 		$248K Buy
+1,810
New +$259K 0.01% 1109
2023
Q1 		– Sell
-850
Closed -$235K – 2135
2022
Q4 		$235K Sell
850
-1,077
-56% -$304K 0.01% 1530
2022
Q3 		$515K Sell
1,927
-18,225
-90% -$3.87M 0.01% 1214
2022
Q2 		$4.11M Buy
20,152
+2
+0% +$409 0.11% 248
2022
Q1 		$4.24M Sell
20,150
-3,217
-14% -$700K 0.1% 257
2021
Q4 		$5.61M Buy
23,367
+13,079
+127% +$3.36M 0.13% 173
2021
Q3 		$2.91M Sell
10,288
-9,233
-47% -$3.03M 0.08% 310
2021
Q2 		$6.76M Buy
19,521
+17,741
+997% +$5.37M 0.22% 101
2021
Q1 		$498K Sell
1,780
-700
-28% -$189K 0.02% 950
2020
Q4 		$607K Buy
2,480
+1,333
+116% +$344K 0.02% 675
2020
Q3 		$325K Sell
1,147
-4,166
-78% -$1.16M 0.02% 785
2020
Q2 		$1.42M Sell
5,313
-906
-15% -$272K 0.1% 281
2020
Q1 		$1.97M Sell
6,219
-781
-11% -$237K 0.16% 159
2019
Q4 		$2.08M Sell
7,000
-1,085
-13% -$301K 0.18% 152
2019
Q3 		$1.88M Buy
8,085
+877
+12% +$204K 0.17% 162
2019
Q2 		$1.69M Sell
7,208
-7,679
-52% -$1.77M 0.15% 170
2019
Q1 		$3.52M Buy
+14,887
New +$4.69M 0.34% 65
2017
Q1 		– Sell
-1,847
Closed -$524 – 745
2016
Q4 		$524 Buy
1,847
+241
+15% +$71.4K 0.12% 222
2016
Q3 		$503K Sell
1,606
-25,632
-94% -$7.59M 0.11% 214
2016
Q2 		$912K Buy
+27,238
New +$7.18M 0.35% 63

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

Boothbay Fund Management's BIIB Position: Q1 2026 in Review

Boothbay Fund Management opened a new position in Biogen (BIIB) in Q1 2026: 14,268 shares worth $2.62M. The stake represents 0.03% of the portfolio and ranks #517 among its holdings. This is a return to the name: Boothbay Fund Management previously reported a position in BIIB as recently as Q3 2025.

Boothbay Fund Management first reported a position in BIIB in Q2 2016 and has held it in 23 quarters since. The position peaked at $6.76M in Q2 2021. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Boothbay Fund Management held 14,268 shares of Biogen worth $2.62M as of Q1 2026.
  • Biogen was a new Boothbay Fund Management position in Q1 2026.
  • Biogen made up 0.03% of Boothbay Fund Management's portfolio in Q1 2026, its #517 holding.
  • Boothbay Fund Management first reported a position in Biogen in Q2 2016 and has held it in 23 quarters since.
  • Boothbay Fund Management's Biogen position peaked at $6.76M in Q2 2021.
  • 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Boothbay Fund Management's 13F filing for Q1 2026, filed 15 May 2026.