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
0.228%
12M weight contribution
+0.001 pp
3M weight contribution
-0.016 pp
12M price return
-34.1%
Share of matched S&P 500 members
Monthly observations through Sep 2019
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 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 |
| Feb 2019 | $64.5bn | 0.374% | +0.008 pp | +13.5% | Yes |
| Jan 2019 | $67.3bn | 0.222% | -0.198 pp | -4.0% | Yes |
| Dec 2018 | $60.6bn | 0.217% | -0.203 pp | -13.5% | No |
| 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.