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

Information Technology41.9%+7.32 ppEnergy2.5%+0.19 ppConsumer Discretionary11.8%-0.20 ppMaterials2.0%-0.21 ppCommunication Services2.4%-0.32 ppReal Estate2.0%-0.41 ppUtilities2.4%-0.43 ppIndustrials9.6%-0.50 ppHealth Care9.7%-1.47 ppConsumer Staples5.7%-1.52 ppFinancials9.8%-2.46 pp

2 · Industry

Inside Materials

Paper & Plastic Packaging Products & Materials0.15%-0.17 ppIndustrial Gases0.51%-0.13 ppSpecialty Chemicals0.41%-0.13 ppConstruction Materials0.25%+0.10 ppGold0.20%+0.07 ppSteel0.16%+0.07 ppCopper0.16%+0.04 ppFertilizers & Agricultural Chemicals0.13%-0.03 ppMetal, Glass & Plastic Containers0.03%-0.01 ppCommodity Chemicals0.04%-0.00 pp

3 · Sub-industry

Inside Steel

Steel0.16%+0.065 pp
Concentrated

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

View all contributions →
Steel · weight
0.16%
Industry change · 12M
+0.07 pp
Steel · contribution
+0.065 pp
Company participation
100%
of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

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

CompanyCountryMarket capUniverse weight3M contribution12M contribution12M price returnAbove 6M weight average
Nucor →
NUE
United States$56.9bn0.099%+0.043 pp+0.041 pp+132.1%Yes
Steel Dynamics →
STLD
United States$37.5bn0.065%+0.027 pp+0.024 pp+114.2%Yes

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.