Observatory · observe first
Follow the allocation change
Matched S&P 500 members → sector → industry → sub-industry → company. Each step uses the same percentage points.
Historical time machine
Historical observation
20182026
1 · Sector
Weight and 12M allocation change
2 · Industry
Inside Materials
Specialty Chemicals0.00%-0.83 ppIndustrial Gases0.00%-0.78 ppPaper & Plastic Packaging Products & Materials0.00%-0.21 ppConstruction Materials0.00%-0.15 ppFertilizers & Agricultural Chemicals0.00%-0.12 ppCopper0.00%-0.11 ppSteel0.00%-0.11 ppMetal, Glass & Plastic Containers0.00%-0.11 ppGold0.00%-0.11 ppCommodity Chemicals0.00%+0.00 pp
3 · Sub-industry
Inside Construction Materials
Construction Materials · weight
0.00%
Industry change · 12M
-0.15 pp
Construction Materials · contribution
-0.153 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Feb 2020 · sorted by absolute contribution to 12-month change
| Company | Country | Market cap | Universe weight | 3M contribution | 12M contribution | 12M price return | Above 6M weight average |
|---|---|---|---|---|---|---|---|
| Vulcan Materials Company → VMC | United States | $15.9bn | 0.000% | -0.095 pp | -0.085 pp | +8.9% | No |
| Martin Marietta Materials → MLM | United States | $14.2bn | 0.000% | -0.084 pp | -0.068 pp | +22.5% | No |
Company contributions use weights among matched S&P 500 members and add through each level without rescaling. Companies without matched shares and prices are omitted. These observations do not establish official index weights or actual fund flows.