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 Financials
Transaction & Payment Processing Services0.62%-0.51 ppDiversified Banks3.22%-0.49 ppProperty & Casualty Insurance0.80%-0.40 ppInsurance Brokers0.41%-0.37 ppFinancial Exchanges & Data0.77%-0.35 ppAsset Management & Custody Banks1.18%-0.25 ppInvestment Banking & Brokerage1.41%+0.10 ppLife & Health Insurance0.31%-0.08 ppConsumer Finance0.62%-0.06 ppMulti-line Insurance0.13%-0.05 ppRegional Banks0.32%+0.02 ppReinsurance0.02%-0.01 ppMulti-Sector Holdings0.00%-0.00 pp
3 · Sub-industry
Inside Insurance Brokers
Insurance Brokers · weight
0.41%
Industry change · 12M
-0.37 pp
Insurance Brokers · contribution
-0.375 pp
Company participation
20%
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 |
|---|---|---|---|---|---|---|---|
| Marsh McLennan → MRSH | United States | $77.1bn | 0.134% | +0.009 pp | -0.127 pp | -30.2% | No |
| Arthur J. Gallagher & Co. → AJG | United States | $51.7bn | 0.090% | +0.009 pp | -0.112 pp | -41.5% | No |
| Aon plc → AON | United States | $67.5bn | 0.117% | +0.018 pp | -0.065 pp | -14.7% | Yes |
| Brown & Brown → BRO | United States | $19.1bn | 0.033% | -0.001 pp | -0.040 pp | -49.7% | No |
| Willis Towers Watson → WTW | United States | $23.6bn | 0.041% | +0.001 pp | -0.030 pp | -20.2% | 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.