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 & Defense1.65%-0.57 ppRail Transportation0.57%-0.36 ppIndustrial Conglomerates0.49%-0.32 ppAir Freight & Logistics0.48%-0.28 ppIndustrial Machinery & Supplies & Components0.80%-0.23 ppHuman Resource & Employment Services0.32%-0.18 ppEnvironmental & Facilities Services0.29%-0.16 ppElectrical Components & Equipment0.46%-0.13 ppAgricultural & Farm Machinery0.27%-0.09 ppBuilding Products0.38%-0.08 ppConstruction Machinery & Heavy Transportation Equipment0.52%-0.08 ppResearch & Consulting Services0.13%-0.06 ppPassenger Airlines0.15%-0.04 ppHeavy Electrical Equipment0.02%-0.04 ppCargo Ground Transportation0.10%-0.03 ppConstruction & Engineering0.09%-0.03 ppTrading Companies & Distributors0.11%-0.02 ppData Processing & Outsourced Services0.04%-0.02 ppDiversified Support Services0.10%-0.01 ppPassenger Ground Transportation0.00%+0.00 pp
3 · Sub-industry
Inside Human Resource & Employment Services
Human Resource & Employment Services · weight
0.32%
Industry change · 12M
-0.18 pp
Human Resource & Employment Services · contribution
-0.184 pp
Company participation
0%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jul 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 | $102.1bn | 0.223% | -0.085 pp | -0.124 pp | +4.7% | No |
| Paychex → PAYX | United States | $45.2bn | 0.099% | -0.035 pp | -0.060 pp | +0.6% | No |
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.