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 & Defense3.11%-3.97 ppIndustrial Conglomerates0.67%-0.70 ppIndustrial Machinery & Supplies & Components0.53%-0.55 ppAir Freight & Logistics0.45%-0.53 ppConstruction Machinery & Heavy Transportation Equipment0.39%-0.44 ppElectrical Components & Equipment0.37%-0.35 ppRail Transportation0.60%-0.34 ppPassenger Airlines0.30%-0.26 ppBuilding Products0.24%-0.23 ppHuman Resource & Employment Services0.28%-0.17 ppAgricultural & Farm Machinery0.17%-0.13 ppEnvironmental & Facilities Services0.23%-0.12 ppResearch & Consulting Services0.11%-0.07 ppTrading Companies & Distributors0.05%-0.06 ppData Processing & Outsourced Services0.04%+0.04 ppCargo Ground Transportation0.04%-0.04 ppConstruction & Engineering0.04%-0.03 ppDiversified Support Services0.03%+0.00 ppHeavy Electrical Equipment0.00%+0.00 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Rail Transportation
Rail Transportation · weight
0.60%
Industry change · 12M
-0.34 pp
Rail Transportation · contribution
-0.344 pp
Company participation
33%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jan 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 |
|---|---|---|---|---|---|---|---|
| Union Pacific Corporation → UNP | United States | $117.2bn | 0.387% | +0.021 pp | -0.213 pp | +21.7% | Yes |
| Norfolk Southern → NSC | United States | $45.7bn | 0.151% | -0.004 pp | -0.096 pp | +13.3% | No |
| CSX Corporation → CSX | United States | $18.5bn | 0.061% | -0.005 pp | -0.035 pp | +17.3% | 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.