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 Technology39.9%+2.38 ppEnergy2.7%+0.38 ppHealth Care10.6%+0.37 ppMaterials2.0%-0.11 ppIndustrials9.9%-0.12 ppReal Estate2.1%-0.17 ppCommunication Services2.2%-0.23 ppUtilities2.5%-0.34 ppConsumer Discretionary11.3%-0.38 ppConsumer Staples5.9%-0.60 ppFinancials10.9%-1.19 pp

2 · Industry

Inside Materials

Paper & Plastic Packaging Products & Materials0.18%-0.13 ppIndustrial Gases0.50%-0.09 ppConstruction Materials0.23%+0.08 ppSpecialty Chemicals0.42%-0.06 ppSteel0.17%+0.06 ppCopper0.16%+0.04 ppGold0.17%+0.03 ppFertilizers & Agricultural Chemicals0.14%-0.02 ppMetal, Glass & Plastic Containers0.03%-0.00 ppCommodity Chemicals0.04%+0.00 pp

3 · Sub-industry

Inside Steel

Steel0.17%+0.056 pp
Concentrated

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

View all contributions →
Steel · weight
0.17%
Industry change · 12M
+0.06 pp
Steel · contribution
+0.056 pp
Company participation
100%
of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

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

CompanyCountryMarket capUniverse weight3M contribution12M contribution12M price returnAbove 6M weight average
Nucor →
NUE
United States$58.6bn0.102%+0.033 pp+0.033 pp+82.2%Yes
Steel Dynamics →
STLD
United States$36.0bn0.063%+0.018 pp+0.023 pp+99.3%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.