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 Equipment1.03%+0.37 ppConstruction & Engineering0.38%+0.24 ppAerospace & Defense2.35%-0.23 ppHuman Resource & Employment Services0.21%-0.21 ppIndustrial Machinery & Supplies & Components0.80%-0.20 ppEnvironmental & Facilities Services0.33%-0.19 ppElectrical Components & Equipment0.80%+0.19 ppHeavy Electrical Equipment0.48%+0.17 ppDiversified Support Services0.20%-0.16 ppPassenger Ground Transportation0.25%-0.15 ppBuilding Products0.49%-0.13 ppResearch & Consulting Services0.07%-0.10 ppIndustrial Conglomerates0.52%-0.07 ppAgricultural & Farm Machinery0.25%-0.06 ppTrading Companies & Distributors0.20%+0.04 ppData Processing & Outsourced Services0.03%-0.03 ppAir Freight & Logistics0.34%+0.03 ppRail Transportation0.53%-0.03 ppPassenger Airlines0.19%+0.02 ppCargo Ground Transportation0.13%+0.02 pp
3 · Sub-industry
Inside Human Resource & Employment Services
Human Resource & Employment Services · weight
0.21%
Industry change · 12M
-0.21 pp
Human Resource & Employment Services · contribution
-0.214 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
May 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 | $88.7bn | 0.154% | +0.035 pp | -0.146 pp | -30.1% | Yes |
| Paychex → PAYX | United States | $34.7bn | 0.060% | +0.014 pp | -0.069 pp | -36.1% | 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.