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
Universe›Materials›Steel›Steel

1 · Sector

Weight and 12M allocation change

Materials29.2%+26.88 ppEnergy2.3%-0.54 ppCommunication Services2.2%-0.64 ppUtilities2.1%-0.78 ppReal Estate1.6%-0.97 ppIndustrials7.6%-2.18 ppConsumer Staples4.9%-2.47 ppConsumer Discretionary8.4%-3.06 ppFinancials7.9%-4.65 ppHealth Care8.0%-4.97 ppInformation Technology25.9%-6.63 pp

2 · Industry

Inside Materials

Paper & Plastic Packaging Products & Materials27.67%+27.31 ppIndustrial Gases0.43%-0.25 ppSpecialty Chemicals0.36%-0.20 ppConstruction Materials0.21%+0.06 ppGold0.17%+0.04 ppFertilizers & Agricultural Chemicals0.12%-0.03 ppSteel0.09%-0.02 ppCommodity Chemicals0.04%-0.01 ppMetal, Glass & Plastic Containers0.02%-0.01 ppCopper0.12%-0.01 pp

3 · Sub-industry

Inside Steel

Steel0.09%-0.016 pp
Concentrated

Most of this industry's losses came from a few companies.

View all contributions →
Steel · weight
0.09%
Industry change · 12M
-0.02 pp
Steel · contribution
-0.016 pp
Company participation
0%
of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

Mar 2026 · sorted by absolute contribution to 12-month change

CompanyCountryMarket capUniverse weight3M contribution12M contribution12M price returnAbove 6M weight average
Nucor →
NUE
United States$38.5bn0.056%-0.017 pp-0.010 pp+42.6%No
Steel Dynamics →
STLD
United States$26.1bn0.038%-0.010 pp-0.007 pp+45.9%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.