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 Technology36.6%+3.08 ppIndustrials10.0%+0.39 ppCommunication Services2.7%+0.26 ppMaterials2.4%+0.12 ppEnergy2.5%+0.04 ppUtilities2.6%-0.06 ppReal Estate2.1%-0.26 ppConsumer Staples6.3%-0.46 ppConsumer Discretionary12.3%-0.81 ppFinancials11.4%-1.15 ppHealth Care11.0%-1.15 pp

2 · Industry

Inside Materials

Construction Materials0.31%+0.15 ppGold0.23%+0.13 ppIndustrial Gases0.52%-0.11 ppSpecialty Chemicals0.47%-0.07 ppCopper0.17%+0.05 ppCommodity Chemicals0.04%-0.02 ppSteel0.13%+0.02 ppFertilizers & Agricultural Chemicals0.14%-0.02 ppMetal, Glass & Plastic Containers0.03%-0.01 ppPaper & Plastic Packaging Products & Materials0.34%+0.01 pp

3 · Sub-industry

Inside Steel

Steel0.13%+0.018 pp
Concentrated

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

View all contributions →
Steel · weight
0.13%
Industry change · 12M
+0.02 pp
Steel · contribution
+0.018 pp
Company participation
100%
of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

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

CompanyCountryMarket capUniverse weight3M contribution12M contribution12M price returnAbove 6M weight average
Nucor →
NUE
United States$40.7bn0.078%+0.010 pp+0.011 pp+40.6%Yes
Steel Dynamics →
STLD
United States$26.2bn0.050%+0.005 pp+0.007 pp+42.1%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.