YIH
BIIB icon

Y-Intercept (HK)’s Biogen BIIB Stock Holding History

Y-Intercept (HK)’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 		– Sell
-134,566
Closed -$23.7M – 1567
2025
Q4 		$23.7M Buy
+134,566
New +$22M 0.53% 10
2025
Q3 		– Sell
-6,318
Closed -$793K – 1582
2025
Q2 		$793K Buy
6,318
+4,480
+244% +$558K 0.02% 1046
2025
Q1 		$252K Sell
1,838
-13,310
-88% -$1.9M 0.02% 960
2024
Q4 		$2.32M Buy
15,148
+7,970
+111% +$1.34M 0.15% 178
2024
Q3 		$1.39M Buy
7,178
+4,238
+144% +$887K 0.09% 309
2024
Q2 		$682K Buy
+2,940
New +$639K 0.04% 684
2023
Q2 		– Sell
-2,573
Closed -$715K – 1278
2023
Q1 		$715K Sell
2,573
-3,729
-59% -$1.03M 0.08% 373
2022
Q4 		$1.75M Buy
6,302
+3,458
+122% +$977K 0.26% 73
2022
Q3 		$759K Buy
+2,844
New +$604K 0.08% 385
2022
Q2 		– Sell
-2,882
Closed -$607K – 868
2022
Q1 		$607K Buy
2,882
+185
+7% +$40.2K 0.14% 203
2021
Q4 		$647K Buy
2,697
+1,164
+76% +$299K 0.15% 190
2021
Q3 		$434K Sell
1,533
-12,298
-89% -$4.03M 0.08% 369
2021
Q2 		$4.79M Buy
13,831
+11,168
+419% +$3.38M 1.22% 4
2021
Q1 		$735K Buy
+2,663
New +$718K 0.2% 157

Other funds holding BIIB

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
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
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

Y-Intercept (HK)'s BIIB Position: Q1 2026 in Review

Y-Intercept (HK) sold out of Biogen (BIIB) in Q1 2026, closing a stake of 134,566 shares — an estimated $23.7M sold.

Y-Intercept (HK) first reported a position in BIIB in Q1 2021 and held it in 14 quarters. The position peaked at $23.7M in Q4 2025. 1,012 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Y-Intercept (HK) reported no remaining Biogen position as of Q1 2026 after selling out during the quarter.
  • Y-Intercept (HK) sold 134,566 Biogen shares in Q1 2026, an estimated $23.7M.
  • Y-Intercept (HK) first reported a position in Biogen in Q1 2021 and held it in 14 quarters.
  • Y-Intercept (HK)'s Biogen position peaked at $23.7M in Q4 2025.
  • 1,012 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Y-Intercept (HK)'s 13F filing for Q1 2026, filed 27 Apr 2026.