Observatory · observe first
Marsh McLennan
MRSH · United States · Insurance Brokers · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.122%
12M weight contribution
-0.162 pp
3M weight contribution
-0.056 pp
12M price return
-27.7%
Share of matched S&P 500 members
Monthly observations through Mar 2026
Company price index
A separate dimension from market allocation
Historical observations
Most recent 24 observations at or before the selected month
| Month | Market cap | Universe weight | 12M weight change | 12M return | Above 6M weight average |
|---|---|---|---|---|---|
| Mar 2026 | $84.0bn | 0.122% | -0.162 pp | -27.7% | No |
| Feb 2026 | $90.4bn | 0.124% | -0.137 pp | -20.1% | No |
| Jan 2026 | $92.2bn | 0.176% | -0.060 pp | -11.7% | No |
| Dec 2025 | $90.9bn | 0.178% | -0.059 pp | -11.3% | No |
| Nov 2025 | $89.9bn | 0.177% | -0.076 pp | -20.1% | No |
| Oct 2025 | $87.3bn | 0.171% | -0.081 pp | -17.1% | No |
| Sep 2025 | $99.1bn | 0.198% | -0.057 pp | -8.3% | No |
| Aug 2025 | $101.2bn | 0.210% | -0.061 pp | -8.2% | No |
| Jul 2025 | $97.9bn | 0.207% | +0.010 pp | -9.1% | No |
| Jun 2025 | $107.7bn | 0.232% | +0.038 pp | +5.3% | No |
| May 2025 | $115.1bn | 0.261% | +0.065 pp | +14.2% | Yes |
| Apr 2025 | $111.1bn | 0.267% | -0.018 pp | +14.7% | Yes |
| Mar 2025 | $119.9bn | 0.285% | +0.004 pp | +20.2% | Yes |
| Feb 2025 | $116.8bn | 0.261% | -0.024 pp | +19.3% | Yes |
| Jan 2025 | $106.5bn | 0.237% | -0.047 pp | +13.5% | No |
| Dec 2024 | $104.3bn | 0.237% | -0.042 pp | +13.7% | No |
| Nov 2024 | $114.5bn | 0.253% | -0.054 pp | +18.7% | Yes |
| Oct 2024 | $107.2bn | 0.252% | -0.066 pp | +16.8% | Yes |
| Sep 2024 | $109.7bn | 0.255% | -0.059 pp | +18.9% | Yes |
| Aug 2024 | $111.9bn | 0.270% | -0.037 pp | +18.4% | Yes |
| Jul 2024 | $109.5bn | 0.196% | -0.007 pp | +19.9% | No |
| Jun 2024 | $103.8bn | 0.195% | -0.021 pp | +13.7% | No |
| May 2024 | $102.3bn | 0.196% | -0.016 pp | +21.6% | No |
| Apr 2024 | $98.3bn | 0.285% | -0.016 pp | +12.3% | No |
Its weight is estimated market cap divided by the total estimated market cap of matched S&P 500 members for the month. This is not an official float-adjusted S&P index weight.