BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Redmile Group, LLC's Holding History (CIK: 0001425738)

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

Q1 2021

Shares 162,847 Value ($000) $45,556 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 216,247 Value ($000) $52,950 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 327,447 Value ($000) $92,890 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 162,300 Value ($000) $43,423 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 589,300 Value ($000) $186,443 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 457,500 Value ($000) $135,754 Avg Close $277.46 Range $219.70 - $318.00

Q1 2019

Shares 165,300 Value ($000) $39,074 Avg Close $314.89 Range $216.12 - $344.00

Q3 2016

Shares 677 Value ($000) $212 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 1,229 Value ($000) $297 Avg Close $263.54 Range $223.02 - $292.69

Q2 2015

Shares 79,118 Value ($000) $31,959 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 97,713 Value ($000) $41,258 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 43,113 Value ($000) $14,635 Avg Close $323.51 Range $290.85 - $361.93

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2021	162,847	$45,556	$269.69	$238.40 - $296.38
Q4 2020	216,247	$52,950	$259.08	$223.25 - $363.92
Q3 2020	327,447	$92,890	$278.91	$261.87 - $312.00
Q2 2020	162,300	$43,423	$300.59	$257.60 - $350.24
Q1 2020	589,300	$186,443	$303.47	$262.25 - $374.99
Q4 2019	457,500	$135,754	$277.46	$219.70 - $318.00
Q1 2019	165,300	$39,074	$314.89	$216.12 - $344.00
Q3 2016	677	$212	$296.18	$240.07 - $333.65
Q2 2016	1,229	$297	$263.54	$223.02 - $292.69
Q2 2015	79,118	$31,959	$401.33	$368.88 - $432.88
Q1 2015	97,713	$41,258	$394.14	$334.40 - $480.18
Q4 2014	43,113	$14,635	$323.51	$290.85 - $361.93