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
Construction Machinery & Heavy Transportation Equipment1.02%+0.30 ppConstruction & Engineering0.37%+0.21 ppIndustrial Conglomerates0.39%-0.15 ppPassenger Ground Transportation0.25%-0.14 ppElectrical Components & Equipment0.78%+0.12 ppEnvironmental & Facilities Services0.34%-0.12 ppHuman Resource & Employment Services0.26%-0.12 ppDiversified Support Services0.22%-0.11 ppBuilding Products0.50%-0.09 ppHeavy Electrical Equipment0.48%+0.08 ppIndustrial Machinery & Supplies & Components0.89%-0.07 ppResearch & Consulting Services0.08%-0.06 ppAerospace & Defense2.54%-0.05 ppRail Transportation0.60%+0.05 ppAir Freight & Logistics0.33%+0.04 ppPassenger Airlines0.21%+0.04 ppData Processing & Outsourced Services0.03%-0.03 ppCargo Ground Transportation0.12%+0.03 ppAgricultural & Farm Machinery0.28%-0.02 ppTrading Companies & Distributors0.21%-0.02 pp
3 · Sub-industry
Inside Human Resource & Employment Services
Human Resource & Employment Services · weight
0.26%
Industry change · 12M
-0.12 pp
Human Resource & Employment Services · contribution
-0.116 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jul 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 |
|---|---|---|---|---|---|---|---|
| Automatic Data Processing → ADP | United States | $106.5bn | 0.186% | +0.071 pp | -0.079 pp | -11.5% | Yes |
| Paychex → PAYX | United States | $41.6bn | 0.073% | +0.028 pp | -0.037 pp | -15.5% | 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.