AMPX vs JOBY: Correlation
Measured on weekly returns over the past three years, Amprius Technologies, Inc. (AMPX) and Joby Aviation, Inc. (JOBY) carry a correlation of 0.42, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are AMPX and JOBY?
Over the past 3 years, AMPX and JOBY moved with a correlation of 0.42, which is moderate. The relationship has been stable: the 1-year correlation (0.40) sits close to the 3-year figure. Over 5 years the correlation is 0.32, and the annualized covariance of weekly returns is 3310.0 %².
Few assets follow AMPX as closely as JOBY, which ranks #2 of 15 tracked partners. Their recent paths diverged sharply: over the last 12 months AMPX outperformed by 94.4 percentage points (+44.0% for AMPX against -50.4% for JOBY). Risk is not evenly split, since AMPX carries 1.6 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.
AMPX vs JOBY: side by side
| AMPX (Amprius Technologies, Inc.) | JOBY (Joby Aviation, Inc.) | |
|---|---|---|
| 1-year return | +44.0% | -50.4% |
| 5-year return | n/a | -43.1% |
| Volatility (ann.) | 111.6% | 70.2% |
| Beta vs S&P 500 | 2.16 | 2.37 |
| Max drawdown (3Y) | -87.3% | -67.4% |
| Market cap | $1.5B | $7.1B |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | AMPX | JOBY |
|---|---|---|
| 2022 | – | -54.1% |
| 2023 | -33.3% | +98.5% |
| 2024 | -47.1% | +22.3% |
| 2025 | +181.8% | +62.4% |
| 2026 | +33.2% | -45.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are AMPX and JOBY good diversifiers for each other?
Reasonably. At 0.42, AMPX and JOBY keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between AMPX and JOBY?
The AMPX/JOBY correlation stands at 0.42 on a 3-year window (1 year: 0.40, 5 years: 0.32), computed from weekly returns as of 2026-08-27.
Is JOBY a good diversifier for AMPX?
Reasonably. At 0.42, AMPX and JOBY keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.42 mean?
On the −1 to +1 scale, 0.42 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/ampx-vs-joby.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/ampx-vs-joby/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: AMPX correlations · JOBY correlations
