Alyeska Investment Group
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Alyeska Investment Group’s Biogen BIIB Stock Holding History

Alyeska Investment Group’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
2015
Q3 		– Sell
-7,500
Closed -$3.03M – 469
2015
Q2 		$3.03M Sell
7,500
-75,000
-91% -$30.1M 0.03% 314
2015
Q1 		$34.8M Buy
+82,500
New +$32.5M 0.48% 61

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

Alyeska Investment Group's BIIB Position: Q2 2026 in Review

Alyeska Investment Group increased its Biogen (BIIB) stake by 16% in Q2 2026, buying an estimated $24.4M and bringing the position to 932,374 shares worth $201M. The position accounts for 0.52% of the portfolio, ranked #37.

Alyeska Investment Group first reported a position in BIIB in Q2 2013 and has held it in 18 quarters since. 1,043 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

  • Alyeska Investment Group held 932,374 shares of Biogen worth $201M as of Q2 2026.
  • Alyeska Investment Group bought 127,324 Biogen shares in Q2 2026, an estimated $24.4M.
  • Biogen made up 0.52% of Alyeska Investment Group's portfolio in Q2 2026, its #37 holding.
  • Alyeska Investment Group first reported a position in Biogen in Q2 2013 and has held it in 18 quarters since.
  • 1,043 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Alyeska Investment Group's 13F filing for Q2 2026, filed 14 Aug 2026.