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 & Defense6.81%-0.27 ppIndustrial Conglomerates1.23%-0.14 ppRail Transportation1.04%+0.10 ppIndustrial Machinery & Supplies & Components1.01%-0.06 ppConstruction Machinery & Heavy Transportation Equipment0.78%-0.05 ppHuman Resource & Employment Services0.49%+0.04 ppBuilding Products0.43%-0.03 ppPassenger Airlines0.53%-0.02 ppAgricultural & Farm Machinery0.29%-0.01 ppResearch & Consulting Services0.19%+0.01 ppCargo Ground Transportation0.09%+0.01 ppElectrical Components & Equipment0.71%-0.01 ppConstruction & Engineering0.08%+0.01 ppTrading Companies & Distributors0.10%-0.01 ppDiversified Support Services0.03%+0.00 ppAir Freight & Logistics0.98%+0.00 ppEnvironmental & Facilities Services0.35%+0.00 ppData Processing & Outsourced Services0.00%+0.00 ppHeavy Electrical Equipment0.00%+0.00 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Human Resource & Employment Services
Human Resource & Employment Services · weight
0.49%
Industry change · 12M
+0.04 pp
Human Resource & Employment Services · contribution
+0.038 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
May 2018 · 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 |
|---|---|---|---|---|---|---|---|
| Automatic Data Processing → ADP | United States | $57.3bn | 0.348% | +0.041 pp | +0.035 pp | +5.7% | Yes |
| Paychex → PAYX | United States | $23.6bn | 0.143% | +0.003 pp | +0.003 pp | -3.0% | 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.