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
1 · Sector
Weight and 12M allocation change
2 · Industry
Inside Industrials
Aerospace & Defense2.59%+0.31 ppIndustrial Machinery & Supplies & Components0.92%-0.19 ppHeavy Electrical Equipment0.35%+0.17 ppAir Freight & Logistics0.27%-0.15 ppRail Transportation0.55%-0.09 ppDiversified Support Services0.30%+0.08 ppIndustrial Conglomerates0.51%-0.08 ppConstruction & Engineering0.22%+0.08 ppTrading Companies & Distributors0.24%+0.06 ppCargo Ground Transportation0.09%-0.05 ppHuman Resource & Employment Services0.33%-0.05 ppPassenger Ground Transportation0.41%+0.04 ppBuilding Products0.54%-0.04 ppResearch & Consulting Services0.13%-0.04 ppEnvironmental & Facilities Services0.43%-0.03 ppAgricultural & Farm Machinery0.25%-0.02 ppElectrical Components & Equipment0.61%-0.01 ppPassenger Airlines0.17%+0.01 ppConstruction Machinery & Heavy Transportation Equipment0.74%-0.00 ppData Processing & Outsourced Services0.06%-0.00 pp
3 · Sub-industry
Inside Rail Transportation
Rail Transportation · weight
0.55%
Industry change · 12M
-0.09 pp
Rail Transportation · contribution
-0.088 pp
Company participation
67%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Sep 2025 · sorted by absolute contribution to 12-month change
| Company | Country | Market cap | Universe weight | 3M contribution | 12M contribution | 12M price return | Above 6M weight average |
|---|---|---|---|---|---|---|---|
| Union Pacific Corporation → UNP | United States | $140.2bn | 0.281% | -0.016 pp | -0.069 pp | -1.8% | No |
| CSX Corporation → CSX | United States | $66.2bn | 0.133% | +0.000 pp | -0.023 pp | +4.4% | Yes |
| Norfolk Southern → NSC | United States | $67.5bn | 0.135% | +0.011 pp | +0.004 pp | +23.5% | 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.