MASS vs OPRX: Correlation
Measured on weekly returns over the past three years, 908 Devices Inc. (MASS) and OptimizeRx Corporation (OPRX) carry a correlation of 0.47, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are MASS and OPRX?
Across a 3-year window, the weekly returns of MASS and OPRX correlate at 0.47, moderate. The past 12 months show a weaker link (0.28) than the 3-year average (0.47). Stretching to 5 years gives 0.45, with an annualized covariance of 3258.3 %².
Few assets follow MASS as closely as OPRX, which ranks #2 of 10 tracked partners. Correlation aside, the last 12 months split them widely, with MASS ahead by 131.5 points (+76.2% versus -55.3%).
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.
MASS vs OPRX: side by side
| MASS (908 Devices Inc.) | OPRX (OptimizeRx Corporation) | |
|---|---|---|
| 1-year return | +76.2% | -55.3% |
| 5-year return | -69.9% | -88.3% |
| Volatility (ann.) | 82.7% | 83.6% |
| Beta vs S&P 500 | 1.55 | 2.12 |
| Max drawdown (3Y) | -84.9% | -79.1% |
| Market cap | $0.5B | $0.1B |
| P/E (trailing) | – | 31.3 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | MASS | OPRX |
|---|---|---|
| 2022 | -70.5% | -73.0% |
| 2023 | +47.2% | -14.8% |
| 2024 | -80.4% | -66.0% |
| 2025 | +138.6% | +152.3% |
| 2026 | +111.4% | -36.1% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are MASS and OPRX good diversifiers for each other?
Reasonably. At 0.47, MASS and OPRX keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between MASS and OPRX?
As of 2026-08-27, the correlation of weekly returns between MASS and OPRX is 0.47 over 3 years, 0.28 over 1 year and 0.45 over 5 years.
Is OPRX a good diversifier for MASS?
Reasonably. At 0.47, MASS and OPRX keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.47 mean?
A reading of 0.47 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/mass-vs-oprx.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/mass-vs-oprx/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: MASS correlations · OPRX correlations
