APH vs KLAC: Correlation
Measured on weekly returns over the past three years, Amphenol (APH) and KLA Corporation (KLAC) carry a correlation of 0.59, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are APH and KLAC?
Across a 3-year window, the weekly returns of APH and KLAC correlate at 0.59, moderate. Recent behaviour matches the longer record: 0.54 over 1 year against 0.59 over 3. Stretching to 5 years gives 0.63, with an annualized covariance of 905.2 %².
Among the 38 assets we track against APH, KLAC ranks #19 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months KLAC outperformed by 60.4 percentage points (+47.5% for APH against +107.9% for KLAC). Across three years, the rolling one-year figure varied moderately, from 0.52 to 0.82.
How is this computed?
Pearson correlation on weekly returns: ρ(A,B) = cov(rA, rB) / (σA · σB), over windows of 52, 156 and 260 weeks. Covariance is annualized (×52) and expressed in %². Full definitions on the methodology page.
APH vs KLAC: side by side
| APH (Amphenol) | KLAC (KLA Corporation) | |
|---|---|---|
| 1-year return | +47.5% | +107.9% |
| 5-year return | +338.9% | +463.9% |
| Volatility (ann.) | 33.6% | 45.6% |
| Beta vs S&P 500 | 1.57 | 1.84 |
| Max drawdown (3Y) | -28.2% | -43.6% |
| Market cap | $199.0B | $240.1B |
| P/E (trailing) | 40.3 | 50.2 |
| Dividend yield | 0.57% | 0.44% |
| Sector / category | Information Technology | Information Technology |
Year-by-year returns
| Year | APH | KLAC |
|---|---|---|
| 2022 | -12.0% | -11.2% |
| 2023 | +31.5% | +56.0% |
| 2024 | +41.3% | +9.4% |
| 2025 | +96.1% | +94.5% |
| 2026 | +19.8% | +51.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are APH and KLAC good diversifiers for each other?
To a limited degree. At 0.59 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
FAQ
What is the correlation between APH and KLAC?
Using weekly returns as of 2026-08-27: 0.59 over 3 years, with 0.54 over the last year and 0.63 over 5 years.
Is KLAC a good diversifier for APH?
To a limited degree. At 0.59 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
What does a correlation of 0.59 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/aph-vs-klac.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/aph-vs-klac/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: APH correlations · KLAC correlations
