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
Paper & Plastic Packaging Products & Materials0.25%-0.02 ppConstruction Materials0.17%-0.01 ppMetal, Glass & Plastic Containers0.09%+0.01 ppSpecialty Chemicals0.87%-0.01 ppCopper0.16%-0.00 ppGold0.13%+0.00 ppIndustrial Gases0.21%+0.00 ppSteel0.12%-0.00 ppFertilizers & Agricultural Chemicals0.11%+0.00 ppCommodity Chemicals0.00%+0.00 pp
3 · Sub-industry
Inside Industrial Gases
Industrial Gases · weight
0.21%
Industry change · 12M
+0.00 pp
Industrial Gases · contribution
+0.003 pp
Company participation
50%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Mar 2018 · 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 |
|---|---|---|---|---|---|---|---|
| Air Products → APD | United States | $34.8bn | 0.214% | +0.003 pp | +0.003 pp | -4.9% | Yes |
| Linde plc → LIN | United States | $0.0bn | 0.000% | -0.000 pp | -0.000 pp | -10.2% | 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.