Biogen

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

Historical time machine

Historical observation

20182026

Universe weight

0.124%

12M weight contribution

-0.028 pp

3M weight contribution

+0.029 pp

12M price return

-3.7%

Share of matched S&P 500 members

Monthly observations through Sep 2023

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
Sep 2023	$37.2bn	0.124%	-0.028 pp	-3.7%	Yes
Aug 2023	$38.7bn	0.123%	+0.022 pp	+36.8%	Yes
Jul 2023	$39.1bn	0.085%	-0.022 pp	+25.6%	No
Jun 2023	$41.2bn	0.095%	-0.021 pp	+39.7%	No
May 2023	$42.9bn	0.106%	+0.001 pp	+48.2%	No
Apr 2023	$44.0bn	0.149%	+0.038 pp	+46.7%	Yes
Mar 2023	$40.2bn	0.137%	+0.033 pp	+32.0%	No
Feb 2023	$39.0bn	0.137%	+0.029 pp	+27.9%	No
Jan 2023	$41.9bn	0.143%	+0.032 pp	+28.7%	Yes
Dec 2022	$39.9bn	0.144%	+0.031 pp	+15.4%	Yes
Nov 2022	$43.9bn	0.149%	+0.032 pp	+29.5%	Yes
Oct 2022	$40.8bn	0.145%	+0.014 pp	+6.3%	Yes
Sep 2022	$38.7bn	0.152%	+0.004 pp	-5.7%	Yes
Aug 2022	$28.4bn	0.101%	-0.067 pp	-42.4%	No
Jul 2022	$31.2bn	0.107%	-0.060 pp	-34.2%	No
Jun 2022	$29.9bn	0.116%	-0.068 pp	-41.1%	Yes
May 2022	$29.3bn	0.105%	-0.039 pp	-25.2%	No
Apr 2022	$30.5bn	0.110%	-0.036 pp	-22.4%	No
Mar 2022	$31.0bn	0.104%	+0.021 pp	-24.7%	No
Feb 2022	$31.0bn	0.108%	+0.024 pp	-22.7%	No
Jan 2022	$33.2bn	0.112%	+0.007 pp	-20.0%	No
Dec 2021	$35.2bn	0.113%	-0.040 pp	-2.0%	No
Nov 2021	$34.6bn	0.117%	-0.040 pp	-1.8%	No
Oct 2021	$39.2bn	0.131%	-0.053 pp	+5.8%	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.