Observatory · observe first
Biogen
BIIB · United States · Biotechnology · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.372%
12M weight contribution
-0.048 pp
3M weight contribution
+0.016 pp
12M price return
-16.6%
Share of matched S&P 500 members
Monthly observations through Jun 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 |
|---|---|---|---|---|---|
| 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.