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 & Defense5.41%-1.40 ppAir Freight & Logistics0.71%-0.27 ppEnvironmental & Facilities Services0.48%+0.13 ppIndustrial Machinery & Supplies & Components0.91%-0.11 ppElectrical Components & Equipment0.61%-0.10 ppConstruction Machinery & Heavy Transportation Equipment0.68%-0.10 ppHuman Resource & Employment Services0.59%+0.09 ppIndustrial Conglomerates1.14%-0.09 ppData Processing & Outsourced Services0.08%+0.08 ppRail Transportation1.11%+0.07 ppPassenger Airlines0.47%-0.06 ppAgricultural & Farm Machinery0.26%-0.04 ppCargo Ground Transportation0.05%-0.03 ppResearch & Consulting Services0.22%+0.03 ppTrading Companies & Distributors0.08%-0.03 ppDiversified Support Services0.06%+0.03 ppBuilding Products0.46%+0.03 ppConstruction & Engineering0.08%+0.00 ppHeavy Electrical Equipment0.00%+0.00 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Rail Transportation
Rail Transportation · weight
1.11%
Industry change · 12M
+0.07 pp
Rail Transportation · contribution
+0.065 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
May 2019 · 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 |
|---|---|---|---|---|---|---|---|
| Norfolk Southern → NSC | United States | $51.9bn | 0.302% | +0.024 pp | +0.042 pp | +31.1% | Yes |
| Union Pacific Corporation → UNP | United States | $118.1bn | 0.687% | -0.015 pp | +0.020 pp | +19.3% | Yes |
| CSX Corporation → CSX | United States | $20.1bn | 0.117% | +0.002 pp | +0.003 pp | +16.6% | 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.