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
Latest available · not live
20182026
1 · Sector
Weight and 12M allocation change
2 · Industry
Inside Materials
Paper & Plastic Packaging Products & Materials0.16%-0.19 ppIndustrial Gases0.47%-0.10 ppSpecialty Chemicals0.39%-0.07 ppCopper0.17%+0.06 ppSteel0.14%+0.04 ppConstruction Materials0.19%+0.04 ppGold0.20%+0.02 ppFertilizers & Agricultural Chemicals0.13%-0.02 ppMetal, Glass & Plastic Containers0.02%-0.00 ppCommodity Chemicals0.03%+0.00 pp
3 · Sub-industry
Inside Construction Materials
Construction Materials · weight
0.19%
Industry change · 12M
+0.04 pp
Construction Materials · contribution
+0.037 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Sep 2026 · 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 |
|---|---|---|---|---|---|---|---|
| CRH plc → CRH | United States | $55.1bn | 0.093% | -0.032 pp | +0.093 pp | -30.2% | No |
| Vulcan Materials Company → VMC | United States | $31.7bn | 0.053% | -0.013 pp | -0.028 pp | -19.9% | No |
| Martin Marietta Materials → MLM | United States | $28.8bn | 0.048% | -0.012 pp | -0.028 pp | -23.4% | 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.