BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

CASTLEARK MANAGEMENT LLC's Holding History (CIK: 0001106832)

Note: Option positions (PUT/CALL) are excluded.

Q1 2020
Shares 2,190 Value ($000) $693 Avg Close $303.47 Range $262.25 - $374.99
Q4 2018
Shares 20,759 Value ($000) $6,247 Avg Close $319.14 Range $278.46 - $358.41
Q3 2018
Shares 38,065 Value ($000) $13,449 Avg Close $344.30 Range $288.13 - $388.67
Q2 2018
Shares 16,446 Value ($000) $4,773 Avg Close $281.15 Range $249.17 - $310.91
Q1 2018
Shares 16,586 Value ($000) $4,542 Avg Close $310.41 Range $259.76 - $370.57
Q4 2017
Shares 17,336 Value ($000) $5,523 Avg Close $320.80 Range $301.81 - $348.84
Q3 2017
Shares 41,824 Value ($000) $13,096 Avg Close $296.11 Range $269.50 - $330.00
Q2 2017
Shares 82,026 Value ($000) $22,259 Avg Close $264.42 Range $244.28 - $291.90
Q1 2017
Shares 120,846 Value ($000) $33,042 Avg Close $282.75 Range $260.50 - $301.42
Q4 2016
Shares 104,396 Value ($000) $29,605 Avg Close $296.43 Range $268.00 - $329.83
Q3 2016
Shares 116,380 Value ($000) $36,430 Avg Close $296.18 Range $240.07 - $333.65
Q2 2016
Shares 66,490 Value ($000) $16,079 Avg Close $263.54 Range $223.02 - $292.69
Q3 2015
Shares 23,005 Value ($000) $6,713 Avg Close $330.23 Range $265.00 - $412.24
Q2 2015
Shares 71,130 Value ($000) $28,732 Avg Close $401.33 Range $368.88 - $432.88
Q3 2014
Shares 134,770 Value ($000) $41,222 Avg Close $329.72 Range $298.31 - $349.00
Q1 2014
Shares 134,770 Value ($000) $41,222 Avg Close $317.43 Range $270.62 - $358.89