Observatory · observe first
Ametek
AME · United States · Electrical Components & Equipment · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.089%
12M weight contribution
-0.010 pp
3M weight contribution
+0.001 pp
12M price return
+2.5%
Share of matched S&P 500 members
Monthly observations through Nov 2025
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 |
|---|---|---|---|---|---|
| Nov 2025 | $45.6bn | 0.089% | -0.010 pp | +2.5% | Yes |
| Oct 2025 | $46.5bn | 0.091% | -0.009 pp | +11.0% | Yes |
| Sep 2025 | $43.4bn | 0.087% | -0.006 pp | +10.2% | No |
| Aug 2025 | $42.7bn | 0.088% | -0.007 pp | +8.8% | No |
| Jul 2025 | $42.7bn | 0.090% | +0.018 pp | +7.3% | No |
| Jun 2025 | $41.8bn | 0.090% | +0.018 pp | +9.3% | No |
| May 2025 | $41.3bn | 0.094% | +0.018 pp | +6.1% | No |
| Apr 2025 | $39.1bn | 0.094% | -0.023 pp | -2.3% | No |
| Mar 2025 | $39.7bn | 0.094% | -0.023 pp | -5.3% | No |
| Feb 2025 | $43.7bn | 0.098% | -0.022 pp | +5.7% | Yes |
| Jan 2025 | $42.7bn | 0.095% | -0.016 pp | +14.6% | No |
| Dec 2024 | $41.7bn | 0.095% | -0.019 pp | +10.0% | Yes |
| Nov 2024 | $45.0bn | 0.099% | -0.012 pp | +26.0% | Yes |
| Oct 2024 | $42.4bn | 0.100% | -0.011 pp | +31.1% | Yes |
| Sep 2024 | $39.8bn | 0.093% | -0.021 pp | +17.0% | Yes |
| Aug 2024 | $39.6bn | 0.096% | -0.022 pp | +7.9% | Yes |
| Jul 2024 | $40.2bn | 0.072% | -0.008 pp | +10.1% | No |
| Jun 2024 | $38.6bn | 0.072% | -0.014 pp | +3.6% | No |
| May 2024 | $39.3bn | 0.075% | -0.008 pp | +17.7% | No |
| Apr 2024 | $40.3bn | 0.117% | +0.010 pp | +27.5% | Yes |
| Mar 2024 | $42.3bn | 0.117% | +0.003 pp | +26.7% | Yes |
| Feb 2024 | $41.6bn | 0.119% | +0.005 pp | +28.1% | Yes |
| Jan 2024 | $37.4bn | 0.111% | -0.003 pp | +12.6% | No |
| Dec 2023 | $38.1bn | 0.113% | -0.002 pp | +18.8% | 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.