Viking Global Investors
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Viking Global Investors’s Biogen BIIB Stock Holding History

Viking Global Investors’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
2017
Q2 		– Sell
-688,765
Closed -$188M – 57
2017
Q1 		$188M Sell
688,765
-1,230,047
-64% -$348M 0.83% 28
2016
Q4 		$544M Sell
1,918,812
-267,524
-12% -$79.3M 2.47% 15
2016
Q3 		$684M Sell
2,186,336
-1,024,171
-32% -$303M 2.95% 13
2016
Q2 		$776M Buy
3,210,507
+2,979,560
+1,290% +$785M 3.3% 8
2016
Q1 		$60.1M Sell
230,947
-137,917
-37% -$36.4M 0.26% 44
2015
Q4 		$113M Buy
+368,864
New +$106M 0.43% 42
2015
Q3 		– Sell
-513,444
Closed -$207M – 66
2015
Q2 		$207M Buy
+513,444
New +$206M 0.78% 34
2014
Q2 		– Sell
-388,900
Closed -$119M – 65
2014
Q1 		$119M Buy
+388,900
New +$123M 0.5% 46
2013
Q4 		– Sell
-290,345
Closed -$69.9M – 67
2013
Q3 		$69.9M Sell
290,345
-675,943
-70% -$151M 0.39% 44
2013
Q2 		$208M Buy
+966,288
New +$206M 1.16% 26

Other funds holding BIIB

BlackRock
BlackRock New York $5.7T AUM 30.48% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $127B AUM 44.11% 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
ClearBridge Investments
ClearBridge Investments New York $115B AUM 24.78% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
Northern Trust
Northern Trust Chicago, Illinois $757B AUM 28.64% 1-Year Est. Return