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Fox Run Management’s Biogen BIIB Stock Holding History

Fox Run 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
2025
Q4 		– Sell
-6,969
Closed -$976K – 925
2025
Q3 		$976K Sell
6,969
-5,922
-46% -$800K 0.15% 219
2025
Q2 		$1.62M Buy
12,891
+3,777
+41% +$471K 0.27% 64
2025
Q1 		$1.25M Buy
+9,114
New +$1.3M 0.19% 134
2024
Q4 		– Sell
-7,922
Closed -$1.54M – 876
2024
Q3 		$1.54M Buy
+7,922
New +$1.66M 0.34% 26
2024
Q2 		– Sell
-1,974
Closed -$426K – 781
2024
Q1 		$426K Buy
+1,974
New +$462K 0.09% 430
2023
Q3 		– Sell
-2,380
Closed -$678K – 714
2023
Q2 		$678K Buy
+2,380
New +$708K 0.19% 192
2023
Q1 		– Sell
-1,854
Closed -$513K – 668
2022
Q4 		$513K Buy
+1,854
New +$524K 0.21% 166
2022
Q3 		– Sell
-2,862
Closed -$584K – 606
2022
Q2 		$584K Buy
2,862
+1,255
+78% +$257K 0.29% 87
2022
Q1 		$338K Buy
+1,607
New +$349K 0.19% 225
2021
Q4 		– Sell
-707
Closed -$200K – 482
2021
Q3 		$200K Buy
+707
New +$232K 0.13% 391
2019
Q4 		– Sell
-2,394
Closed -$557K – 388
2019
Q3 		$557K Buy
2,394
+203
+9% +$47.3K 0.51% 28
2019
Q2 		$512K Sell
2,191
-79
-3% -$18.2K 0.34% 71
2019
Q1 		$537K Buy
2,270
+1,005
+79% +$316K 0.3% 89
2018
Q4 		$381K Buy
+1,265
New +$404K 0.2% 195

Other funds holding BIIB

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 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
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
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
Point72 Asset Management
Point72 Asset Management Stamford, Connecticut $90.7B AUM 77.13% 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

Fox Run Management's BIIB Position: Q4 2025 in Review

Fox Run Management sold out of Biogen (BIIB) in Q4 2025, closing a stake of 6,969 shares — an estimated $976K sold.

Fox Run Management first reported a position in BIIB in Q4 2018 and held it in 14 quarters. The position peaked at $1.62M in Q2 2025. 1,001 funds tracked by Wall St. Rank hold BIIB as of Q4 2025.

  • Fox Run Management reported no remaining Biogen position as of Q4 2025 after selling out during the quarter.
  • Fox Run Management sold 6,969 Biogen shares in Q4 2025, an estimated $976K.
  • Fox Run Management first reported a position in Biogen in Q4 2018 and held it in 14 quarters.
  • Fox Run Management's Biogen position peaked at $1.62M in Q2 2025.
  • 1,001 funds tracked by Wall St. Rank held Biogen as of Q4 2025.

Based on Fox Run Management's 13F filing for Q4 2025, filed 11 Feb 2026.