BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

THORNBURG INVESTMENT MANAGEMENT INC's Holding History (CIK: 0001145020)

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

Q3 2015

Shares 39,500 Value ($000) $11,526 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 54,781 Value ($000) $22,128 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 43,161 Value ($000) $18,224 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 45,781 Value ($000) $15,540 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 42,776 Value ($000) $14,151 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 37,347 Value ($000) $11,776 Avg Close $300.97 Range $272.02 - $322.25

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2015	39,500	$11,526	$330.23	$265.00 - $412.24
Q2 2015	54,781	$22,128	$401.33	$368.88 - $432.88
Q1 2015	43,161	$18,224	$394.14	$334.40 - $480.18
Q4 2014	45,781	$15,540	$323.51	$290.85 - $361.93
Q3 2014	42,776	$14,151	$329.72	$298.31 - $349.00
Q2 2014	37,347	$11,776	$300.97	$272.02 - $322.25