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
Latest available · not live
20182026
Universe›Materials›Steel›Steel

1 · Sector

Weight and 12M allocation change

Information Technology43.1%+4.93 ppEnergy3.8%+1.55 ppHealth Care10.6%+0.26 ppMaterials1.9%-0.22 ppCommunication Services2.1%-0.27 ppReal Estate1.8%-0.35 ppIndustrials9.1%-0.58 ppUtilities2.1%-0.61 ppConsumer Staples5.4%-0.78 ppConsumer Discretionary10.3%-1.78 ppFinancials9.7%-2.16 pp

2 · Industry

Inside Materials

Paper & Plastic Packaging Products & Materials0.16%-0.19 ppIndustrial Gases0.47%-0.10 ppSpecialty Chemicals0.39%-0.07 ppCopper0.17%+0.06 ppSteel0.14%+0.04 ppConstruction Materials0.19%+0.04 ppGold0.20%+0.02 ppFertilizers & Agricultural Chemicals0.13%-0.02 ppMetal, Glass & Plastic Containers0.02%-0.00 ppCommodity Chemicals0.03%+0.00 pp

3 · Sub-industry

Inside Steel

Steel0.14%+0.039 pp
Concentrated

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

View all contributions →
Steel · weight
0.14%
Industry change · 12M
+0.04 pp
Steel · contribution
+0.039 pp
Company participation
0%
of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

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

CompanyCountryMarket capUniverse weight3M contribution12M contribution12M price returnAbove 6M weight average
Nucor →
NUE
United States$53.0bn0.089%+0.001 pp+0.027 pp+74.6%No
Steel Dynamics →
STLD
United States$31.8bn0.053%-0.004 pp+0.012 pp+60.6%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.