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Woodline Partners’s Biogen BIIB Stock Holding History

Woodline Partners’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 		$20M Buy
109,032
+6,714
+7% +$1.24M 0.08% 344
2025
Q4 		$18M Buy
102,318
+5,652
+6% +$923K 0.07% 336
2025
Q3 		$13.5M Buy
96,666
+1,106
+1% +$150K 0.06% 366
2025
Q2 		$12M Sell
95,560
-29,602
-24% -$3.69M 0.06% 385
2025
Q1 		$17.1M Buy
125,162
+37,005
+42% +$5.29M 0.11% 256
2024
Q4 		$13.5M Buy
88,157
+5,874
+7% +$991K 0.09% 288
2024
Q3 		$15.9M Buy
82,283
+1,683
+2% +$352K 0.13% 219
2024
Q2 		$18.7M Hold
80,600
– – 0.18% 176
2024
Q1 		$17.4M Hold
80,600
– – 0.16% 192
2023
Q4 		$20.9M Buy
+80,600
New +$19.8M 0.23% 134
2023
Q3 		– Sell
-2,213
Closed -$630K – 600
2023
Q2 		$630K Sell
2,213
-140,865
-98% -$41.9M 0.01% 521
2023
Q1 		$39.8M Buy
143,078
+107,569
+303% +$29.8M 0.54% 39
2022
Q4 		$9.83M Sell
35,509
-38,445
-52% -$10.9M 0.13% 212
2022
Q3 		$19.7M Buy
73,954
+36,542
+98% +$7.76M 0.28% 103
2022
Q2 		$7.63M Sell
37,412
-16,655
-31% -$3.4M 0.12% 205
2022
Q1 		$11.4M Buy
54,067
+16,286
+43% +$3.54M 0.18% 160
2021
Q4 		$9.06M Sell
37,781
-14,637
-28% -$3.76M 0.13% 209
2021
Q3 		$14.8M Sell
52,418
-21,039
-29% -$6.9M 0.24% 113
2021
Q2 		$25.4M Buy
73,457
+55,981
+320% +$17M 0.47% 53
2021
Q1 		$4.89M Buy
+17,476
New +$4.71M 0.11% 198

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

Woodline Partners's BIIB Position: Q1 2026 in Review

Woodline Partners increased its Biogen (BIIB) stake by 6.6% in Q1 2026, buying an estimated $1.24M and bringing the position to 109,032 shares worth $20M. The position accounts for 0.08% of the portfolio, ranked #344.

Woodline Partners first reported a position in BIIB in Q1 2021 and has held it in 20 quarters since. The position peaked at $39.8M in Q1 2023. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Woodline Partners held 109,032 shares of Biogen worth $20M as of Q1 2026.
  • Woodline Partners bought 6,714 Biogen shares in Q1 2026, an estimated $1.24M.
  • Biogen made up 0.08% of Woodline Partners's portfolio in Q1 2026, its #344 holding.
  • Woodline Partners first reported a position in Biogen in Q1 2021 and has held it in 20 quarters since.
  • Woodline Partners's Biogen position peaked at $39.8M in Q1 2023.
  • 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Woodline Partners's 13F filing for Q1 2026, filed 15 May 2026.