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 Technology40.9%+4.04 ppEnergy3.9%+1.55 ppHealth Care10.6%+0.01 ppCommunication Services2.3%-0.19 ppMaterials2.0%-0.23 ppReal Estate1.9%-0.31 ppIndustrials9.3%-0.48 ppUtilities2.2%-0.48 ppConsumer Staples5.5%-0.92 ppConsumer Discretionary10.8%-1.27 ppFinancials10.5%-1.72 pp

2 · Industry

Inside Materials

Paper & Plastic Packaging Products & Materials0.17%-0.21 ppIndustrial Gases0.49%-0.11 ppSpecialty Chemicals0.41%-0.09 ppConstruction Materials0.21%+0.06 ppGold0.22%+0.05 ppCopper0.18%+0.05 ppSteel0.15%+0.04 ppFertilizers & Agricultural Chemicals0.14%-0.02 ppMetal, Glass & Plastic Containers0.03%-0.00 ppCommodity Chemicals0.04%+0.00 pp

3 · Sub-industry

Inside Steel

Steel0.15%+0.039 pp
Concentrated

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

View all contributions →
Steel · weight
0.15%
Industry change · 12M
+0.04 pp
Steel · contribution
+0.039 pp
Company participation
100%
of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

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

CompanyCountryMarket capUniverse weight3M contribution12M contribution12M price returnAbove 6M weight average
Nucor →
NUE
United States$56.6bn0.094%-0.004 pp+0.024 pp+70.1%Yes
Steel Dynamics →
STLD
United States$33.3bn0.056%-0.009 pp+0.016 pp+79.8%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.