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 & Defense4.10%-1.41 ppIndustrial Machinery & Supplies & Components1.22%+0.22 ppAir Freight & Logistics0.89%+0.18 ppPassenger Airlines0.28%-0.18 ppIndustrial Conglomerates1.20%-0.15 ppBuilding Products0.55%+0.12 ppAgricultural & Farm Machinery0.35%+0.08 ppHuman Resource & Employment Services0.46%-0.07 ppCargo Ground Transportation0.11%+0.05 ppRail Transportation0.94%-0.03 ppEnvironmental & Facilities Services0.40%-0.03 ppConstruction Machinery & Heavy Transportation Equipment0.69%-0.02 ppTrading Companies & Distributors0.13%+0.02 ppResearch & Consulting Services0.22%+0.02 ppConstruction & Engineering0.09%+0.01 ppElectrical Components & Equipment0.64%-0.01 ppDiversified Support Services0.13%+0.00 ppData Processing & Outsourced Services0.07%+0.00 ppHeavy Electrical Equipment0.00%+0.00 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Rail Transportation
Rail Transportation · weight
0.94%
Industry change · 12M
-0.03 pp
Rail Transportation · contribution
-0.026 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Nov 2020 · 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 | $137.5bn | 0.584% | +0.583 pp | -0.031 pp | +18.4% | Yes |
| CSX Corporation → CSX | United States | $23.0bn | 0.097% | +0.097 pp | +0.004 pp | +27.6% | Yes |
| Norfolk Southern → NSC | United States | $60.2bn | 0.256% | +0.255 pp | +0.001 pp | +24.9% | 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.