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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
2022
Q4 		– Sell
-85,100
Closed -$22.7M – 2011
2022
Q3 		$22.7M Buy
+85,100
New +$18.1M 0.57% 8
2022
Q1 		– Sell
-6,700
Closed -$1.61M – 2278
2021
Q4 		$1.61M Buy
+6,700
New +$1.72M 0.04% 558
2021
Q1 		– Sell
-378
Closed -$9.26M – 1544
2020
Q4 		$9.26M Buy
378
+232
+159% +$59.9K 0.34% 36
2020
Q3 		$4.14M Buy
+146
New +$40.7K 0.25% 83
2019
Q2 		– Sell
-91
Closed -$2.15M – 747
2019
Q1 		$2.15M Buy
91
+2
+2% +$630 0.21% 113
2018
Q4 		$2.68M Buy
+89
New +$28.4K 0.39% 50

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.