Observatory · observe first
Amphenol
APH · United States · Electronic Components · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.151%
12M weight contribution
+0.060 pp
3M weight contribution
+0.022 pp
12M price return
+91.4%
Share of matched S&P 500 members
Monthly observations through Sep 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 |
|---|---|---|---|---|---|
| Sep 2025 | $75.5bn | 0.151% | +0.060 pp | +91.4% | Yes |
| Aug 2025 | $66.5bn | 0.138% | +0.040 pp | +62.9% | Yes |
| Jul 2025 | $65.0bn | 0.137% | +0.068 pp | +67.3% | Yes |
| Jun 2025 | $59.7bn | 0.129% | +0.091 pp | +47.9% | Yes |
| May 2025 | $54.4bn | 0.123% | +0.085 pp | +37.1% | Yes |
| Apr 2025 | $46.5bn | 0.112% | +0.059 pp | +28.6% | Yes |
| Mar 2025 | $39.7bn | 0.094% | +0.046 pp | +14.7% | No |
| Feb 2025 | $40.3bn | 0.090% | +0.043 pp | +23.0% | No |
| Jan 2025 | $42.7bn | 0.095% | +0.050 pp | +41.2% | No |
| Dec 2024 | $41.9bn | 0.095% | +0.051 pp | +41.3% | Yes |
| Nov 2024 | $43.8bn | 0.097% | +0.054 pp | +61.0% | Yes |
| Oct 2024 | $40.4bn | 0.095% | +0.054 pp | +67.8% | Yes |
| Sep 2024 | $39.2bn | 0.091% | +0.050 pp | +56.5% | Yes |
| Aug 2024 | $40.6bn | 0.098% | +0.056 pp | +53.9% | Yes |
| Jul 2024 | $38.7bn | 0.069% | +0.041 pp | +46.7% | Yes |
| Jun 2024 | $20.2bn | 0.038% | +0.009 pp | +59.9% | No |
| May 2024 | $19.9bn | 0.038% | +0.010 pp | +77.1% | No |
| Apr 2024 | $18.1bn | 0.053% | +0.015 pp | +61.5% | Yes |
| Mar 2024 | $17.3bn | 0.048% | +0.007 pp | +42.5% | Yes |
| Feb 2024 | $16.4bn | 0.047% | +0.006 pp | +42.3% | Yes |
| Jan 2024 | $15.1bn | 0.045% | +0.004 pp | +28.0% | Yes |
| Dec 2023 | $14.8bn | 0.044% | +0.003 pp | +31.5% | Yes |
| Nov 2023 | $13.6bn | 0.042% | +0.002 pp | +14.3% | Yes |
| Oct 2023 | $12.0bn | 0.041% | +0.001 pp | +7.3% | 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.