CET vs IDCC: Correlation
Central Securities Corporation (CET) and InterDigital, Inc. (IDCC) show a moderate relationship: their 3-year correlation of weekly returns is 0.41.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CET and IDCC?
On 3 years of weekly data the CET/IDCC correlation comes out at 0.41, moderate. The relationship has been stable: the 1-year correlation (0.43) sits close to the 3-year figure. The 5-year figure is 0.40, and annualized covariance runs at 203.2 %².
By 3-year correlation, IDCC places #32 of the 38 assets tracked against CET. Over the last 12 months IDCC came out ahead by 9.5 percentage points (+15.7% against +25.2%). Note the risk asymmetry: IDCC runs 3.0 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
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.
CET vs IDCC: side by side
| CET (Central Securities Corporation) | IDCC (InterDigital, Inc.) | |
|---|---|---|
| 1-year return | +15.7% | +25.2% |
| 5-year return | +73.3% | +406.1% |
| Volatility (ann.) | 12.8% | 38.9% |
| Beta vs S&P 500 | 0.78 | 0.92 |
| Max drawdown (3Y) | -15.4% | -36.5% |
| Market cap | – | $8.6B |
| P/E (trailing) | 7.3 | 39.4 |
| Dividend yield | 5.03% | 0.81% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | CET | IDCC |
|---|---|---|
| 2022 | -19.7% | -29.3% |
| 2023 | +19.2% | +123.7% |
| 2024 | +26.8% | +81.1% |
| 2025 | +17.2% | +66.0% |
| 2026 | +8.3% | +5.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CET and IDCC good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.41 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between CET and IDCC?
As of 2026-08-27, the correlation of weekly returns between CET and IDCC is 0.41 over 3 years, 0.43 over 1 year and 0.40 over 5 years.
Is IDCC a good diversifier for CET?
Yes, to a useful degree: a correlation of 0.41 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.41 mean?
A reading of 0.41 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/cet-vs-idcc.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/cet-vs-idcc/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: CET correlations · IDCC correlations
