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 & Defense2.28%-3.35 ppIndustrial Conglomerates0.70%-0.51 ppRail Transportation0.52%-0.47 ppIndustrial Machinery & Supplies & Components0.65%-0.32 ppHuman Resource & Employment Services0.25%-0.27 ppElectrical Components & Equipment0.36%-0.27 ppPassenger Airlines0.15%-0.27 ppEnvironmental & Facilities Services0.21%-0.24 ppConstruction Machinery & Heavy Transportation Equipment0.41%-0.23 ppAir Freight & Logistics0.45%-0.17 ppResearch & Consulting Services0.12%-0.10 ppBuilding Products0.32%-0.10 ppDiversified Support Services0.07%-0.06 ppConstruction & Engineering0.05%-0.03 ppData Processing & Outsourced Services0.04%-0.03 ppAgricultural & Farm Machinery0.22%-0.03 ppTrading Companies & Distributors0.07%-0.03 ppCargo Ground Transportation0.06%-0.02 ppHeavy Electrical Equipment0.00%+0.00 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Rail Transportation
Rail Transportation · weight
0.52%
Industry change · 12M
-0.47 pp
Rail Transportation · contribution
-0.465 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jan 2021 · 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 | $133.1bn | 0.319% | -0.247 pp | -0.296 pp | +12.4% | No |
| Norfolk Southern → NSC | United States | $60.1bn | 0.144% | -0.108 pp | -0.124 pp | +15.8% | No |
| CSX Corporation → CSX | United States | $21.9bn | 0.052% | -0.043 pp | -0.046 pp | +13.8% | 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.