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 Banks3.54%-0.33 ppTransaction & Payment Processing Services0.68%-0.30 ppFinancial Exchanges & Data0.77%-0.27 ppAsset Management & Custody Banks1.30%-0.21 ppConsumer Finance0.63%-0.21 ppInsurance Brokers0.47%-0.20 ppProperty & Casualty Insurance0.87%-0.15 ppLife & Health Insurance0.33%-0.04 ppInvestment Banking & Brokerage1.44%+0.03 ppMulti-line Insurance0.13%-0.03 ppReinsurance0.02%-0.01 ppRegional Banks0.32%-0.00 ppMulti-Sector Holdings0.00%-0.00 pp
3 · Sub-industry
Inside Insurance Brokers
Insurance Brokers · weight
0.47%
Industry change · 12M
-0.20 pp
Insurance Brokers · contribution
-0.198 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Aug 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 | $90.6bn | 0.151% | +0.017 pp | -0.059 pp | -5.9% | Yes |
| Aon plc → AON | United States | $68.2bn | 0.114% | -0.003 pp | -0.050 pp | -12.0% | Yes |
| Arthur J. Gallagher & Co. → AJG | United States | $67.2bn | 0.112% | +0.022 pp | -0.049 pp | -12.4% | Yes |
| Brown & Brown → BRO | United States | $24.1bn | 0.040% | +0.007 pp | -0.026 pp | -24.8% | Yes |
| Willis Towers Watson → WTW | United States | $31.4bn | 0.052% | +0.011 pp | -0.014 pp | +4.9% | 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.