Observatory · observe first
Arch Capital Group
ACGL · United States · Property & Casualty Insurance · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Latest available · not live
20182026
Universe weight
0.053%
12M weight contribution
-0.015 pp
3M weight contribution
-0.006 pp
12M price return
+1.8%
Share of matched S&P 500 members
Monthly observations through Sep 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 |
|---|---|---|---|---|---|
| Sep 2026 | $31.5bn | 0.053% | -0.015 pp | +1.8% | No |
| Aug 2026 | $33.5bn | 0.056% | -0.015 pp | +7.1% | Yes |
| Jul 2026 | $35.1bn | 0.061% | -0.007 pp | +16.8% | Yes |
| Jun 2026 | $33.9bn | 0.059% | -0.015 pp | +6.6% | Yes |
| May 2026 | $31.2bn | 0.054% | -0.027 pp | -6.0% | No |
| Apr 2026 | $33.6bn | 0.046% | -0.036 pp | +4.2% | No |
| Mar 2026 | $34.2bn | 0.050% | -0.036 pp | -0.2% | No |
| Feb 2026 | $35.6bn | 0.049% | -0.029 pp | +7.8% | No |
| Jan 2026 | $34.8bn | 0.067% | -0.011 pp | +3.2% | No |
| Dec 2025 | $34.8bn | 0.068% | -0.011 pp | +3.9% | Yes |
| Nov 2025 | $34.1bn | 0.067% | -0.017 pp | -6.8% | No |
| Oct 2025 | $32.2bn | 0.063% | -0.024 pp | -7.9% | No |
| Sep 2025 | $33.9bn | 0.068% | -0.030 pp | -14.7% | No |
| Aug 2025 | $34.2bn | 0.071% | -0.032 pp | -14.9% | No |
| Jul 2025 | $32.3bn | 0.068% | +0.004 pp | -5.5% | No |
| Jun 2025 | $34.1bn | 0.074% | +0.003 pp | -5.1% | No |
| May 2025 | $35.6bn | 0.081% | +0.007 pp | -2.6% | Yes |
| Apr 2025 | $34.0bn | 0.082% | -0.020 pp | +1.9% | Yes |
| Mar 2025 | $36.1bn | 0.086% | -0.010 pp | +9.4% | Yes |
| Feb 2025 | $34.9bn | 0.078% | -0.016 pp | +11.6% | No |
| Jan 2025 | $35.0bn | 0.078% | -0.014 pp | +18.7% | No |
| Dec 2024 | $34.7bn | 0.079% | -0.004 pp | +30.8% | No |
| Nov 2024 | $37.9bn | 0.084% | -0.014 pp | +26.6% | No |
| Oct 2024 | $37.1bn | 0.087% | -0.023 pp | +13.7% | Yes |
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.