AMPH vs BC: Correlation
How closely do Amphastar Pharmaceuticals, Inc. (AMPH) and Brunswick Corporation (BC) trade together? Their weekly returns over three years give a correlation of 0.45, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are AMPH and BC?
Over the past 3 years, AMPH and BC moved with a correlation of 0.45, which is moderate. Little has changed lately, as the 1-year reading of 0.48 lands near the 3-year figure. Over 5 years the correlation is 0.30, and the annualized covariance of weekly returns is 713.7 %².
By 3-year correlation, BC places #5 of the 13 assets tracked against AMPH. Correlation aside, the last 12 months split them widely, with BC ahead by 49.9 points (-28.2% versus +21.7%).
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.
AMPH vs BC: side by side
| AMPH (Amphastar Pharmaceuticals, Inc.) | BC (Brunswick Corporation) | |
|---|---|---|
| 1-year return | -28.2% | +21.7% |
| 5-year return | +12.9% | -15.3% |
| Volatility (ann.) | 44.1% | 35.8% |
| Beta vs S&P 500 | 0.67 | 1.22 |
| Max drawdown (3Y) | -73.4% | -56.5% |
| Market cap | $0.9B | $5.0B |
| P/E (trailing) | 13.0 | – |
| Dividend yield | 0.00% | 2.18% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | AMPH | BC |
|---|---|---|
| 2022 | +20.3% | -27.1% |
| 2023 | +120.7% | +36.9% |
| 2024 | -40.0% | -31.8% |
| 2025 | -27.9% | +18.1% |
| 2026 | -18.3% | +6.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are AMPH and BC 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 AMPH and BC?
Using weekly returns as of 2026-08-27: 0.45 over 3 years, with 0.48 over the last year and 0.30 over 5 years.
Is BC a good diversifier for AMPH?
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/amph-vs-bc.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/amph-vs-bc/)
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Related comparisons
Hubs: AMPH correlations · BC correlations
