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
Latest available · not live
20182026
1 · Sector
Weight and 12M allocation change
2 · Industry
Inside Financials
Diversified Banks3.30%-0.54 ppAsset Management & Custody Banks1.15%-0.30 ppTransaction & Payment Processing Services0.64%-0.26 ppInsurance Brokers0.41%-0.23 ppFinancial Exchanges & Data0.72%-0.23 ppConsumer Finance0.58%-0.21 ppProperty & Casualty Insurance0.83%-0.18 ppInvestment Banking & Brokerage1.28%-0.13 ppLife & Health Insurance0.32%-0.04 ppMulti-line Insurance0.12%-0.03 ppReinsurance0.02%-0.01 ppRegional Banks0.30%-0.00 ppMulti-Sector Holdings0.00%-0.00 pp
3 · Sub-industry
Inside Insurance Brokers
Insurance Brokers · weight
0.41%
Industry change · 12M
-0.23 pp
Insurance Brokers · contribution
-0.228 pp
Company participation
40%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Sep 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 | $81.5bn | 0.137% | -0.003 pp | -0.061 pp | -13.5% | No |
| Arthur J. Gallagher & Co. → AJG | United States | $58.5bn | 0.098% | -0.004 pp | -0.061 pp | -25.5% | Yes |
| Aon plc → AON | United States | $58.7bn | 0.099% | -0.024 pp | -0.055 pp | -22.0% | No |
| Brown & Brown → BRO | United States | $20.4bn | 0.034% | -0.004 pp | -0.028 pp | -34.4% | No |
| Willis Towers Watson → WTW | United States | $26.8bn | 0.045% | +0.002 pp | -0.022 pp | -15.5% | 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.