INSP vs PRCT: Correlation
How closely do Inspire Medical Systems, Inc. (INSP) and PROCEPT BioRobotics Corporation (PRCT) trade together? Their weekly returns over three years give a correlation of 0.37, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are INSP and PRCT?
Across a 3-year window, the weekly returns of INSP and PRCT correlate at 0.37, moderate. Lately the two have drifted apart, with the 1-year correlation at 0.26 versus 0.37 over 3 years. Stretching to 5 years gives 0.40, with an annualized covariance of 1390.4 %².
By 3-year correlation, PRCT places #4 of the 10 assets tracked against INSP. The last year tells two different stories: INSP led by 15.4 percentage points, -34.1% for INSP against -49.5% for PRCT.
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.
INSP vs PRCT: side by side
| INSP (Inspire Medical Systems, Inc.) | PRCT (PROCEPT BioRobotics Corporation) | |
|---|---|---|
| 1-year return | -34.1% | -49.5% |
| 5-year return | -72.6% | -50.9% |
| Volatility (ann.) | 67.2% | 55.9% |
| Beta vs S&P 500 | 0.77 | 1.08 |
| Max drawdown (3Y) | -84.1% | -83.2% |
| Market cap | $1.8B | $1.2B |
| P/E (trailing) | 13.6 | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | INSP | PRCT |
|---|---|---|
| 2022 | +9.5% | +66.1% |
| 2023 | -19.2% | +0.9% |
| 2024 | -8.9% | +92.1% |
| 2025 | -50.2% | -60.9% |
| 2026 | -34.1% | -34.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are INSP and PRCT good diversifiers for each other?
A fair diversifier. At 0.37, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between INSP and PRCT?
Using weekly returns as of 2026-08-27: 0.37 over 3 years, with 0.26 over the last year and 0.40 over 5 years.
Is PRCT a good diversifier for INSP?
A fair diversifier. At 0.37, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.37 mean?
On the −1 to +1 scale, 0.37 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/insp-vs-prct.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/insp-vs-prct/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: INSP correlations · PRCT correlations
