AMPH vs VTRS: Correlation
Amphastar Pharmaceuticals, Inc. (AMPH) and Viatris (VTRS) show a moderate relationship: their 3-year correlation of weekly returns is 0.46.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are AMPH and VTRS?
Across a 3-year window, the weekly returns of AMPH and VTRS correlate at 0.46, moderate. The relationship has been stable: the 1-year correlation (0.39) sits close to the 3-year figure. Stretching to 5 years gives 0.30, with an annualized covariance of 659.2 %².
Within AMPH's tracked universe of 13 assets, VTRS comes in at #4 by 3-year correlation. Correlation aside, the last 12 months split them widely, with VTRS ahead by 96.0 points (-28.2% versus +67.8%).
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 VTRS: side by side
| AMPH (Amphastar Pharmaceuticals, Inc.) | VTRS (Viatris) | |
|---|---|---|
| 1-year return | -28.2% | +67.8% |
| 5-year return | +12.9% | +44.6% |
| Volatility (ann.) | 44.1% | 32.8% |
| Beta vs S&P 500 | 0.67 | 0.79 |
| Max drawdown (3Y) | -73.4% | -45.0% |
| Market cap | $0.9B | $19.4B |
| P/E (trailing) | 13.0 | – |
| Dividend yield | 0.00% | 2.85% |
| Sector / category | US Listed | Health Care |
Year-by-year returns
| Year | AMPH | VTRS |
|---|---|---|
| 2022 | +20.3% | -14.3% |
| 2023 | +120.7% | +2.1% |
| 2024 | -40.0% | +19.7% |
| 2025 | -27.9% | +5.1% |
| 2026 | -18.3% | +38.9% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are AMPH and VTRS good diversifiers for each other?
Reasonably. At 0.46, AMPH and VTRS keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between AMPH and VTRS?
Using weekly returns as of 2026-08-27: 0.46 over 3 years, with 0.39 over the last year and 0.30 over 5 years.
Is VTRS a good diversifier for AMPH?
Reasonably. At 0.46, AMPH and VTRS keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.46 mean?
A reading of 0.46 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/amph-vs-vtrs.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/amph-vs-vtrs/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: AMPH correlations · VTRS correlations
