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

Materials27.4%+25.10 ppEnergy2.1%-0.32 ppCommunication Services2.0%-0.81 ppUtilities2.0%-0.92 ppReal Estate1.6%-0.95 ppIndustrials7.6%-2.27 ppConsumer Discretionary8.9%-2.59 ppConsumer Staples4.7%-2.85 ppFinancials7.8%-4.44 ppInformation Technology28.4%-4.69 ppHealth Care7.4%-5.25 pp

2 · Industry

Inside Materials

Paper & Plastic Packaging Products & Materials25.93%+25.58 ppIndustrial Gases0.41%-0.25 ppSpecialty Chemicals0.33%-0.22 ppConstruction Materials0.21%+0.05 ppFertilizers & Agricultural Chemicals0.11%-0.05 ppGold0.16%+0.02 ppMetal, Glass & Plastic Containers0.02%-0.01 ppCommodity Chemicals0.04%-0.01 ppCopper0.11%-0.01 ppSteel0.11%+0.00 pp

3 · Sub-industry

Inside Steel

Steel0.11%+0.002 pp
Concentrated

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

View all contributions →
Steel · weight
0.11%
Industry change · 12M
+0.00 pp
Steel · contribution
+0.002 pp
Company participation
100%
of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

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

CompanyCountryMarket capUniverse weight3M contribution12M contribution12M price returnAbove 6M weight average
Nucor →
NUE
United States$51.3bn0.070%-0.008 pp+0.004 pp+91.6%Yes
Steel Dynamics →
STLD
United States$33.0bn0.045%-0.005 pp-0.002 pp+78.7%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.