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 & Defense5.54%-1.28 ppAir Freight & Logistics0.78%-0.19 ppRail Transportation1.12%+0.13 ppHuman Resource & Employment Services0.57%+0.11 ppEnvironmental & Facilities Services0.45%+0.10 ppData Processing & Outsourced Services0.08%+0.08 ppConstruction Machinery & Heavy Transportation Equipment0.73%-0.06 ppIndustrial Machinery & Supplies & Components0.98%-0.03 ppDiversified Support Services0.05%+0.03 ppAgricultural & Farm Machinery0.29%+0.02 ppPassenger Airlines0.51%-0.02 ppResearch & Consulting Services0.21%+0.02 ppCargo Ground Transportation0.06%-0.02 ppElectrical Components & Equipment0.67%-0.02 ppBuilding Products0.46%+0.02 ppIndustrial Conglomerates1.20%-0.02 ppConstruction & Engineering0.08%+0.01 ppTrading Companies & Distributors0.09%-0.01 ppHeavy Electrical Equipment0.00%+0.00 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Diversified Support Services
Diversified Support Services · weight
0.05%
Industry change · 12M
+0.03 pp
Diversified Support Services · contribution
+0.025 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Apr 2019 · sorted by absolute contribution to 12-month change
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.