Question 1

How many shares of BIIB does RA CAPITAL MANAGEMENT, L.P. own?

Accepted Answer

RA CAPITAL MANAGEMENT, L.P. previously held 0 shares of BIIB (BIOGEN IDEC INC) before exiting the position in 2024-Q4.

Question 2

What is RA CAPITAL MANAGEMENT, L.P.'s BIIB position worth?

Accepted Answer

RA CAPITAL MANAGEMENT, L.P.'s BIIB position was last reported at $0 in 2024-Q4 before the exit.

Question 3

Is RA CAPITAL MANAGEMENT, L.P. buying or selling BIIB?

Accepted Answer

In 2024-Q4, RA CAPITAL MANAGEMENT, L.P. exited their BIIB position entirely (-100.0% change in shares).

Question 4

When did RA CAPITAL MANAGEMENT, L.P. first buy BIIB?

Accepted Answer

Based on available 13F filings, RA CAPITAL MANAGEMENT, L.P. first reported a position in BIIB in 2024-Q3. They have held the position across 12 quarters.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2024-Q4 Latest	Exited	0	-100.0%	$0	0.0%	$150.19	0
2024-Q3	Increased	1.2M	+20.6%	$229.6M	2.6%	$194.67	63