APH vs TDY: Correlation
Amphenol (APH) and Teledyne Technologies (TDY) show a moderate relationship: their 3-year correlation of weekly returns is 0.45.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are APH and TDY?
On 3 years of weekly data the APH/TDY correlation comes out at 0.45, moderate. Little has changed lately, as the 1-year reading of 0.36 lands near the 3-year figure. The 5-year figure is 0.47, and annualized covariance runs at 332.7 %².
Among the 38 assets we track against APH, TDY ranks #26 by 3-year correlation. The last year tells two different stories: APH led by 31.8 percentage points, +47.5% for APH against +15.7% for TDY. The relationship is regime-dependent: the rolling one-year correlation swung between 0.10 and 0.65 over the past three years, so this pair behaves very differently depending on the market environment. Note the risk asymmetry: APH runs 1.5 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
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 TDY: side by side
| APH (Amphenol) | TDY (Teledyne Technologies) | |
|---|---|---|
| 1-year return | +47.5% | +15.7% |
| 5-year return | +338.9% | +36.5% |
| Volatility (ann.) | 33.6% | 22.0% |
| Beta vs S&P 500 | 1.57 | 0.76 |
| Max drawdown (3Y) | -28.2% | -18.8% |
| Market cap | $199.0B | $29.0B |
| P/E (trailing) | 40.3 | 30.7 |
| Dividend yield | 0.57% | 0.00% |
| Sector / category | Information Technology | Information Technology |
Year-by-year returns
| Year | APH | TDY |
|---|---|---|
| 2022 | -12.0% | -8.5% |
| 2023 | +31.5% | +11.6% |
| 2024 | +41.3% | +4.0% |
| 2025 | +96.1% | +10.0% |
| 2026 | +19.8% | +22.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are APH and TDY good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.45 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between APH and TDY?
As of 2026-08-27, the correlation of weekly returns between APH and TDY is 0.45 over 3 years, 0.36 over 1 year and 0.47 over 5 years.
Is TDY a good diversifier for APH?
Yes, to a useful degree: a correlation of 0.45 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.45 mean?
On the −1 to +1 scale, 0.45 describes how much the two returns move together: +1 is lockstep, 0 is independence, negative values mean opposite directions. It says nothing about which performed better.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/aph-vs-tdy.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/aph-vs-tdy/)
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Related comparisons
Hubs: APH correlations · TDY correlations
