CSTL vs TCMD: Correlation
Measured on weekly returns over the past three years, Castle Biosciences, Inc. (CSTL) and Tactile Systems Technology, Inc. (TCMD) carry a correlation of 0.50, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CSTL and TCMD?
On 3 years of weekly data the CSTL/TCMD correlation comes out at 0.50, moderate. Little has changed lately, as the 1-year reading of 0.49 lands near the 3-year figure. The 5-year figure is 0.38, and annualized covariance runs at 2030.4 %².
Few assets follow CSTL as closely as TCMD, which ranks #3 of 12 tracked partners. Correlation aside, the last 12 months split them widely, with TCMD ahead by 21.9 points (+53.8% versus +75.7%).
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.
CSTL vs TCMD: side by side
| CSTL (Castle Biosciences, Inc.) | TCMD (Tactile Systems Technology, Inc.) | |
|---|---|---|
| 1-year return | +53.8% | +75.7% |
| 5-year return | -54.0% | -47.2% |
| Volatility (ann.) | 64.2% | 63.6% |
| Beta vs S&P 500 | 0.79 | 0.87 |
| Max drawdown (3Y) | -57.8% | -51.8% |
| Market cap | $1.0B | $0.5B |
| P/E (trailing) | – | 22.0 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | CSTL | TCMD |
|---|---|---|
| 2022 | -45.1% | -39.7% |
| 2023 | -8.3% | +24.6% |
| 2024 | +23.5% | +19.8% |
| 2025 | +46.0% | +69.3% |
| 2026 | -11.9% | -20.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CSTL and TCMD good diversifiers for each other?
Only partially. A correlation of 0.50 means CSTL and TCMD share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
FAQ
What is the correlation between CSTL and TCMD?
As of 2026-08-27, the correlation of weekly returns between CSTL and TCMD is 0.50 over 3 years, 0.49 over 1 year and 0.38 over 5 years.
Is TCMD a good diversifier for CSTL?
Only partially. A correlation of 0.50 means CSTL and TCMD share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.50 mean?
On the −1 to +1 scale, 0.50 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/cstl-vs-tcmd.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/cstl-vs-tcmd/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: CSTL correlations · TCMD correlations
