APH vs BST: Correlation
How closely do Amphenol (APH) and BlackRock Science and Technology Trust (BST) trade together? Their weekly returns over three years give a correlation of 0.70, which is strong.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are APH and BST?
On 3 years of weekly data the APH/BST correlation comes out at 0.70, strong. Little has changed lately, as the 1-year reading of 0.62 lands near the 3-year figure. The 5-year figure is 0.70, and annualized covariance runs at 524.1 %².
BST is one of the assets that tracks APH most closely: it ranks #2 out of the 38 assets we track against APH. The trailing year gives APH the advantage: +47.5% versus +40.7%, a 6.8-point spread. Risk is not evenly split, since APH carries 1.5 times the volatility of the other side.
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 BST: side by side
| APH (Amphenol) | BST (BlackRock Science and Technology Trust) | |
|---|---|---|
| 1-year return | +47.5% | +40.7% |
| 5-year return | +338.9% | +46.7% |
| Volatility (ann.) | 33.6% | 22.2% |
| Beta vs S&P 500 | 1.57 | 1.27 |
| Max drawdown (3Y) | -28.2% | -23.4% |
| Market cap | $199.0B | – |
| P/E (trailing) | 40.3 | 6.9 |
| Dividend yield | 0.57% | 0.00% |
| Sector / category | Information Technology | US Listed |
Year-by-year returns
| Year | APH | BST |
|---|---|---|
| 2022 | -12.0% | -38.3% |
| 2023 | +31.5% | +30.1% |
| 2024 | +41.3% | +18.0% |
| 2025 | +96.1% | +23.7% |
| 2026 | +19.8% | +30.9% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are APH and BST good diversifiers for each other?
Somewhat, no more. With 0.70 correlation, most large moves hit both names, and the diversification benefit stays modest.
FAQ
What is the correlation between APH and BST?
Using weekly returns as of 2026-08-27: 0.70 over 3 years, with 0.62 over the last year and 0.70 over 5 years.
Is BST a good diversifier for APH?
Somewhat, no more. With 0.70 correlation, most large moves hit both names, and the diversification benefit stays modest.
What does a correlation of 0.70 mean?
A reading of 0.70 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/aph-vs-bst.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/aph-vs-bst/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: APH correlations · BST correlations
