Biogen

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

Historical time machine

Historical observation

20182026

Universe weight

0.083%

12M weight contribution

+0.083 pp

3M weight contribution

-0.074 pp

12M price return

-11.5%

Share of matched S&P 500 members

Monthly observations through Feb 2021

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
Feb 2021	$41.6bn	0.083%	+0.083 pp	-11.5%	No
Jan 2021	$43.5bn	0.104%	-0.135 pp	+5.1%	Yes
Dec 2020	$37.7bn	0.153%	-0.110 pp	-17.5%	Yes
Nov 2020	$37.0bn	0.157%	-0.116 pp	-19.9%	Yes
Oct 2020	$38.8bn	0.184%	-0.097 pp	-15.6%	Yes
Sep 2020	$44.9bn	0.000%	-0.228 pp	+21.8%	No
Aug 2020	$45.5bn	0.000%	-0.220 pp	+30.9%	No
Jul 2020	$43.5bn	0.000%	-0.233 pp	+15.5%	No
Jun 2020	$43.7bn	0.000%	-0.244 pp	+14.4%	No
May 2020	$50.1bn	0.000%	-0.247 pp	+40.0%	No
Apr 2020	$48.4bn	0.271%	+0.023 pp	+29.5%	Yes
Mar 2020	$55.1bn	0.000%	-0.267 pp	+33.8%	No
Feb 2020	$53.7bn	0.000%	-0.374 pp	-6.0%	No
Jan 2020	$48.5bn	0.239%	+0.018 pp	-19.5%	No
Dec 2019	$53.5bn	0.263%	+0.046 pp	-1.4%	Yes
Nov 2019	$54.1bn	0.273%	+0.049 pp	-10.2%	Yes
Oct 2019	$53.9bn	0.281%	+0.073 pp	-1.8%	Yes
Sep 2019	$42.9bn	0.228%	+0.001 pp	-34.1%	No
Aug 2019	$40.5bn	0.220%	-0.009 pp	-37.8%	No
Jul 2019	$43.9bn	0.233%	-0.159 pp	-28.9%	No
Jun 2019	$45.3bn	0.244%	-0.127 pp	-19.4%	No
May 2019	$42.5bn	0.248%	-0.129 pp	-25.4%	No
Apr 2019	$44.4bn	0.248%	-0.107 pp	-16.2%	No
Mar 2019	$46.5bn	0.267%	-0.088 pp	-13.7%	Yes

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.