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 Chemicals0.47%-0.42 ppIndustrial Gases0.42%+0.21 ppPaper & Plastic Packaging Products & Materials0.12%-0.15 ppCopper0.06%-0.11 ppConstruction Materials0.08%-0.10 ppGold0.06%-0.06 ppSteel0.06%-0.06 ppFertilizers & Agricultural Chemicals0.07%-0.04 ppMetal, Glass & Plastic Containers0.06%-0.02 ppCommodity Chemicals0.00%+0.00 pp
3 · Sub-industry
Inside Construction Materials
Construction Materials · weight
0.08%
Industry change · 12M
-0.10 pp
Construction Materials · contribution
-0.103 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jan 2019 · 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 | $13.4bn | 0.044% | -0.001 pp | -0.058 pp | -24.2% | No |
| Martin Marietta Materials → MLM | United States | $11.1bn | 0.037% | -0.000 pp | -0.045 pp | -21.9% | 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.