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 & Defense1.93%-0.45 ppIndustrial Machinery & Supplies & Components0.69%-0.33 ppHuman Resource & Employment Services0.17%-0.26 ppEnvironmental & Facilities Services0.30%-0.22 ppDiversified Support Services0.17%-0.20 ppIndustrial Conglomerates0.41%-0.19 ppRail Transportation0.41%-0.18 ppBuilding Products0.39%-0.17 ppPassenger Ground Transportation0.22%-0.15 ppHeavy Electrical Equipment0.36%+0.14 ppConstruction & Engineering0.26%+0.14 ppAir Freight & Logistics0.26%-0.11 ppResearch & Consulting Services0.07%-0.10 ppAgricultural & Farm Machinery0.22%-0.08 ppConstruction Machinery & Heavy Transportation Equipment0.74%+0.07 ppData Processing & Outsourced Services0.03%-0.04 ppPassenger Airlines0.13%-0.03 ppCargo Ground Transportation0.09%-0.03 ppElectrical Components & Equipment0.58%+0.02 ppTrading Companies & Distributors0.14%-0.01 pp
3 · Sub-industry
Inside Rail Transportation
Rail Transportation · weight
0.41%
Industry change · 12M
-0.18 pp
Rail Transportation · contribution
-0.184 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Mar 2026 · 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 | $144.0bn | 0.210% | -0.059 pp | -0.129 pp | +5.1% | No |
| Norfolk Southern → NSC | United States | $64.5bn | 0.094% | -0.033 pp | -0.033 pp | +23.6% | No |
| CSX Corporation → CSX | United States | $76.3bn | 0.111% | -0.021 pp | -0.021 pp | +41.6% | 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.