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
Rail Transportation0.77%-0.18 ppConstruction Machinery & Heavy Transportation Equipment0.76%+0.17 ppIndustrial Machinery & Supplies & Components1.16%+0.15 ppElectrical Components & Equipment0.70%+0.14 ppAir Freight & Logistics0.64%-0.12 ppIndustrial Conglomerates0.69%-0.10 ppAerospace & Defense2.37%+0.08 ppEnvironmental & Facilities Services0.41%-0.06 ppBuilding Products0.52%+0.06 ppHuman Resource & Employment Services0.47%-0.05 ppDiversified Support Services0.15%+0.04 ppTrading Companies & Distributors0.16%+0.03 ppHeavy Electrical Equipment0.02%-0.03 ppConstruction & Engineering0.14%+0.02 ppAgricultural & Farm Machinery0.38%-0.02 ppCargo Ground Transportation0.14%+0.02 ppPassenger Airlines0.20%+0.01 ppResearch & Consulting Services0.19%+0.00 ppData Processing & Outsourced Services0.07%-0.00 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Rail Transportation
Rail Transportation · weight
0.77%
Industry change · 12M
-0.18 pp
Rail Transportation · contribution
-0.179 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Aug 2023 · 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 | $134.4bn | 0.428% | +0.138 pp | -0.073 pp | +0.8% | Yes |
| Norfolk Southern → NSC | United States | $46.5bn | 0.148% | +0.031 pp | -0.056 pp | -13.7% | Yes |
| CSX Corporation → CSX | United States | $60.6bn | 0.193% | +0.039 pp | -0.049 pp | -3.2% | 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.