Biogen

BIIB · United States · Biotechnology · matched S&P 500 member. Follow its market-weight contribution.

Historical time machine

Historical observation

20182026

Universe weight

0.223%

12M weight contribution

-0.196 pp

3M weight contribution

-0.006 pp

12M price return

-4.1%

Share of matched S&P 500 members

Monthly observations through Nov 2018

Company price index

A separate dimension from market allocation

Historical observations

Most recent 24 observations at or before the selected month

Month	Market cap	Universe weight	12M weight change	12M return	Above 6M weight average
Nov 2018	$67.2bn	0.223%	-0.196 pp	-4.1%	No
Oct 2018	$61.3bn	0.208%	-0.212 pp	-12.5%	No
Sep 2018	$71.2bn	0.227%	-0.193 pp	+1.6%	No
Aug 2018	$71.2bn	0.230%	-0.190 pp	+1.6%	No
Jul 2018	$67.4bn	0.393%	-0.027 pp	-3.9%	Yes
Jun 2018	$61.2bn	0.372%	-0.048 pp	-16.6%	No
May 2018	$62.0bn	0.376%	-0.043 pp	-15.5%	Yes
Apr 2018	$57.7bn	0.355%	-0.065 pp	-21.3%	No
Mar 2018	$57.9bn	0.355%	-0.064 pp	-21.3%	No
Feb 2018	$61.1bn	0.366%	-0.053 pp	-16.9%	No
Jan 2018	$73.6bn	0.420%	+0.000 pp	+0.0%	No

Its weight is estimated market cap divided by the total estimated market cap of matched S&P 500 members for the month. This is not an official float-adjusted S&P index weight.