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 & Defense3.11%-3.97 ppIndustrial Conglomerates0.67%-0.70 ppIndustrial Machinery & Supplies & Components0.53%-0.55 ppAir Freight & Logistics0.45%-0.53 ppConstruction Machinery & Heavy Transportation Equipment0.39%-0.44 ppElectrical Components & Equipment0.37%-0.35 ppRail Transportation0.60%-0.34 ppPassenger Airlines0.30%-0.26 ppBuilding Products0.24%-0.23 ppHuman Resource & Employment Services0.28%-0.17 ppAgricultural & Farm Machinery0.17%-0.13 ppEnvironmental & Facilities Services0.23%-0.12 ppResearch & Consulting Services0.11%-0.07 ppTrading Companies & Distributors0.05%-0.06 ppData Processing & Outsourced Services0.04%+0.04 ppCargo Ground Transportation0.04%-0.04 ppConstruction & Engineering0.04%-0.03 ppDiversified Support Services0.03%+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
0.28%
Industry change · 12M
-0.17 pp
Human Resource & Employment Services · contribution
-0.168 pp
Company participation
50%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Jan 2019 · 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 | $60.9bn | 0.201% | -0.013 pp | -0.112 pp | +15.5% | No |
| Paychex → PAYX | United States | $25.4bn | 0.084% | +0.004 pp | -0.056 pp | +7.3% | 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.