Observatory · observe first
LyondellBasell
LYB · United States · Specialty Chemicals · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.035%
12M weight contribution
-0.004 pp
3M weight contribution
+0.002 pp
12M price return
+15.4%
Share of matched S&P 500 members
Monthly observations through Jul 2026
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 |
|---|---|---|---|---|---|
| Jul 2026 | $20.1bn | 0.035% | -0.004 pp | +15.4% | Yes |
| Jun 2026 | $17.0bn | 0.030% | -0.011 pp | -2.0% | No |
| May 2026 | $21.5bn | 0.037% | -0.004 pp | +28.9% | Yes |
| Apr 2026 | $24.0bn | 0.033% | -0.012 pp | +40.0% | Yes |
| Mar 2026 | $26.0bn | 0.038% | -0.016 pp | +25.0% | Yes |
| Feb 2026 | $18.5bn | 0.025% | -0.030 pp | -17.8% | No |
| Jan 2026 | $15.8bn | 0.030% | -0.024 pp | -28.9% | No |
| Dec 2025 | $13.9bn | 0.027% | -0.027 pp | -36.0% | No |
| Nov 2025 | $15.8bn | 0.031% | -0.029 pp | -36.2% | No |
| Oct 2025 | $14.9bn | 0.029% | -0.037 pp | -42.0% | No |
| Sep 2025 | $15.8bn | 0.032% | -0.041 pp | -44.5% | No |
| Aug 2025 | $18.1bn | 0.038% | -0.040 pp | -38.0% | No |
| Jul 2025 | $18.6bn | 0.039% | -0.019 pp | -37.4% | No |
| Jun 2025 | $18.6bn | 0.040% | -0.018 pp | -35.0% | No |
| May 2025 | $18.2bn | 0.041% | -0.021 pp | -39.6% | No |
| Apr 2025 | $18.7bn | 0.045% | -0.049 pp | -38.1% | No |
| Mar 2025 | $22.8bn | 0.054% | -0.038 pp | -26.8% | No |
| Feb 2025 | $24.9bn | 0.056% | -0.038 pp | -19.0% | No |
| Jan 2025 | $24.6bn | 0.055% | -0.036 pp | -14.9% | No |
| Dec 2024 | $24.1bn | 0.055% | -0.037 pp | -17.4% | No |
| Nov 2024 | $27.1bn | 0.060% | -0.036 pp | -8.8% | No |
| Oct 2024 | $28.2bn | 0.066% | -0.033 pp | +1.5% | Yes |
| Sep 2024 | $31.2bn | 0.073% | -0.030 pp | +6.8% | Yes |
| Aug 2024 | $32.1bn | 0.078% | -0.025 pp | +5.4% | 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.