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
Industrial Conglomerates0.66%-0.18 ppAgricultural & Farm Machinery0.33%-0.12 ppIndustrial Machinery & Supplies & Components1.18%+0.11 ppRail Transportation0.78%-0.11 ppAir Freight & Logistics0.59%-0.11 ppDiversified Support Services0.24%+0.10 ppHuman Resource & Employment Services0.43%-0.09 ppPassenger Airlines0.16%-0.04 ppEnvironmental & Facilities Services0.49%+0.04 ppConstruction Machinery & Heavy Transportation Equipment0.71%+0.03 ppElectrical Components & Equipment0.65%+0.02 ppTrading Companies & Distributors0.15%+0.02 ppResearch & Consulting Services0.19%+0.01 ppData Processing & Outsourced Services0.07%+0.01 ppBuilding Products0.50%-0.01 ppConstruction & Engineering0.13%+0.01 ppAerospace & Defense2.39%-0.01 ppCargo Ground Transportation0.13%+0.00 ppHeavy Electrical Equipment0.02%-0.00 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Human Resource & Employment Services
Human Resource & Employment Services · weight
0.43%
Industry change · 12M
-0.09 pp
Human Resource & Employment Services · contribution
-0.091 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Nov 2023 · 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 | $94.6bn | 0.295% | -0.039 pp | -0.077 pp | -11.1% | Yes |
| Paychex → PAYX | United States | $44.1bn | 0.137% | -0.003 pp | -0.014 pp | +1.3% | 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.