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Rock Springs Capital Management’s Biogen BIIB Stock Holding History

Rock Springs Capital 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
2021
Q1 		– Sell
-130,000
Closed -$31.8M – 154
2020
Q4 		$31.8M Buy
+130,000
New +$33.5M 0.67% 51
2019
Q3 		– Sell
-97,500
Closed -$22.8M – 141
2019
Q2 		$22.8M Hold
97,500
– – 0.82% 47
2019
Q1 		$23M Buy
+97,500
New +$30.7M 0.89% 38

Other funds holding BIIB

Primecap Management
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BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
ClearBridge Investments
ClearBridge Investments New York $115B AUM 24.78% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return
Northern Trust
Northern Trust Chicago, Illinois $757B AUM 28.64% 1-Year Est. Return

Rock Springs Capital Management's BIIB Position: Q3 2021 in Review

Rock Springs Capital Management sold out of Biogen (BIIB) in Q3 2021, closing a stake of 113,500 shares — an estimated $39.3M sold.

Rock Springs Capital Management first reported a position in BIIB in Q4 2013 and held it in 27 quarters. The position peaked at $56.9M in Q1 2020. 1,040 funds tracked by Wall St. Rank hold BIIB as of Q3 2021.

  • Rock Springs Capital Management reported no remaining Biogen position as of Q3 2021 after selling out during the quarter.
  • Rock Springs Capital Management sold 113,500 Biogen shares in Q3 2021, an estimated $39.3M.
  • Rock Springs Capital Management first reported a position in Biogen in Q4 2013 and held it in 27 quarters.
  • Rock Springs Capital Management's Biogen position peaked at $56.9M in Q1 2020.
  • 1,040 funds tracked by Wall St. Rank held Biogen as of Q3 2021.

Based on Rock Springs Capital Management's 13F filing for Q3 2021, filed 15 Nov 2021.