Observatory · observe first
ON Semiconductor
ON · United States · Semiconductors · matched S&P 500 member. Follow its market-weight contribution.
Historical time machine
Historical observation
20182026
Universe weight
0.036%
12M weight contribution
-0.005 pp
3M weight contribution
-0.007 pp
12M price return
+52.2%
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 | $24.4bn | 0.036% | -0.005 pp | +52.2% | No |
| Feb 2026 | $26.2bn | 0.036% | -0.008 pp | +41.3% | No |
| Jan 2026 | $24.1bn | 0.046% | -0.003 pp | +14.4% | Yes |
| Dec 2025 | $21.8bn | 0.043% | -0.018 pp | -14.1% | Yes |
| Nov 2025 | $20.2bn | 0.040% | -0.027 pp | -29.4% | No |
| Oct 2025 | $20.5bn | 0.040% | -0.030 pp | -29.0% | No |
| Sep 2025 | $20.2bn | 0.040% | -0.032 pp | -32.1% | No |
| Aug 2025 | $20.3bn | 0.042% | -0.039 pp | -36.3% | No |
| Jul 2025 | $23.6bn | 0.050% | -0.010 pp | -28.0% | Yes |
| Jun 2025 | $21.9bn | 0.047% | -0.008 pp | -23.5% | Yes |
| May 2025 | $17.6bn | 0.040% | -0.020 pp | -42.5% | No |
| Apr 2025 | $16.7bn | 0.040% | -0.047 pp | -43.4% | No |
| Mar 2025 | $17.1bn | 0.041% | -0.046 pp | -44.7% | No |
| Feb 2025 | $19.8bn | 0.044% | -0.052 pp | -40.4% | No |
| Jan 2025 | $22.3bn | 0.050% | -0.042 pp | -26.4% | No |
| Dec 2024 | $26.8bn | 0.061% | -0.046 pp | -24.5% | No |
| Nov 2024 | $30.3bn | 0.067% | -0.029 pp | -0.3% | No |
| Oct 2024 | $30.0bn | 0.071% | -0.021 pp | +12.5% | Yes |
| Sep 2024 | $31.1bn | 0.072% | -0.062 pp | -21.9% | Yes |
| Aug 2024 | $33.4bn | 0.081% | -0.055 pp | -20.9% | Yes |
| Jul 2024 | $33.5bn | 0.060% | -0.041 pp | -27.4% | No |
| Jun 2024 | $29.5bn | 0.055% | -0.039 pp | -27.5% | No |
| May 2024 | $31.4bn | 0.060% | -0.029 pp | -12.6% | No |
| Apr 2024 | $30.2bn | 0.087% | -0.018 pp | -2.5% | 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.