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 Technology38.2%+3.54 ppFinancials11.8%+0.88 ppConsumer Discretionary12.1%+0.80 ppIndustrials9.7%-0.00 ppCommunication Services2.4%-0.05 ppUtilities2.7%-0.15 ppEnergy2.3%-0.17 ppMaterials2.1%-0.43 ppReal Estate2.2%-0.45 ppConsumer Staples6.2%-0.90 ppHealth Care10.4%-3.06 pp

2 · Industry

Inside Materials

Specialty Chemicals0.46%-0.17 ppIndustrial Gases0.57%-0.12 ppCommodity Chemicals0.03%-0.06 ppCopper0.11%-0.05 ppGold0.19%+0.04 ppPaper & Plastic Packaging Products & Materials0.35%-0.03 ppSteel0.10%-0.03 ppMetal, Glass & Plastic Containers0.03%-0.02 ppFertilizers & Agricultural Chemicals0.14%-0.01 ppConstruction Materials0.16%+0.00 pp

3 · Sub-industry

Inside Steel

Steel0.10%-0.025 pp
Concentrated

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

View all contributions →
Steel · weight
0.10%
Industry change · 12M
-0.03 pp
Steel · contribution
-0.025 pp
Company participation
0%
of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

Sep 2025 · sorted by absolute contribution to 12-month change

CompanyCountryMarket capUniverse weight3M contribution12M contribution12M price returnAbove 6M weight average
Nucor →
NUE
United States$31.1bn0.062%-0.002 pp-0.021 pp-8.3%No
Steel Dynamics →
STLD
United States$20.5bn0.041%+0.000 pp-0.004 pp+12.3%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.