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
Diversified Banks6.60%+2.44 ppTransaction & Payment Processing Services2.55%+1.51 ppFinancial Exchanges & Data1.06%+0.52 ppProperty & Casualty Insurance1.12%+0.47 ppInvestment Banking & Brokerage1.16%+0.44 ppConsumer Finance0.85%+0.33 ppLife & Health Insurance0.76%+0.29 ppAsset Management & Custody Banks0.84%+0.28 ppInsurance Brokers0.60%+0.27 ppRegional Banks0.56%+0.19 ppMulti-line Insurance0.35%+0.15 ppReinsurance0.06%+0.03 ppMulti-Sector Holdings0.00%+0.00 pp
3 · Sub-industry
Inside Insurance Brokers
Insurance Brokers · weight
0.60%
Industry change · 12M
+0.27 pp
Insurance Brokers · contribution
+0.275 pp
Company participation
33%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Nov 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 |
|---|---|---|---|---|---|---|---|
| Marsh McLennan → MRSH | United States | $54.5bn | 0.275% | -0.000 pp | +0.126 pp | +24.1% | Yes |
| Aon plc → AON | United States | $47.7bn | 0.240% | -0.010 pp | +0.108 pp | +24.5% | No |
| Arthur J. Gallagher & Co. → AJG | United States | $17.4bn | 0.088% | -0.004 pp | +0.041 pp | +23.5% | 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.