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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
Q2 		– Sell
-14,268
Closed -$2.62M – 2268
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 -$524K – 745
2016
Q4 		$524K 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

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Norges Bank
Norges Bank Oslo, Norway $1T AUM
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

Boothbay Fund Management's BIIB Position: Q2 2026 in Review

Boothbay Fund Management sold out of Biogen (BIIB) in Q2 2026, closing a stake of 14,268 shares — an estimated $2.62M sold.

Boothbay Fund Management first reported a position in BIIB in Q2 2016 and held it in 23 quarters. The position peaked at $6.76M in Q2 2021. 1,043 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

  • Boothbay Fund Management reported no remaining Biogen position as of Q2 2026 after selling out during the quarter.
  • Boothbay Fund Management sold 14,268 Biogen shares in Q2 2026, an estimated $2.62M.
  • Boothbay Fund Management first reported a position in Biogen in Q2 2016 and held it in 23 quarters.
  • Boothbay Fund Management's Biogen position peaked at $6.76M in Q2 2021.
  • 1,043 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Boothbay Fund Management's 13F filing for Q2 2026, filed 14 Aug 2026.