CISS vs SIF: Correlation
C3is Inc. (CISS) and SIFCO Industries, Inc. (SIF) show a negative relationship: their 3-year correlation of weekly returns is -0.23.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CISS and SIF?
Across a 3-year window, the weekly returns of CISS and SIF correlate at -0.23, negative, meaning they tend to move in opposite directions. Lately the two have drifted apart, with the 1-year correlation at -0.35 versus -0.23 over 3 years. Stretching to 5 years gives n/a, with an annualized covariance of -37694.1 %².
By 3-year correlation, SIF places #24 of the 42 assets tracked against CISS. Their recent paths diverged sharply: over the last 12 months SIF outperformed by 331.7 percentage points (-99.5% for CISS against +232.2% for SIF). Note the risk asymmetry: CISS runs 27.3 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.
CISS vs SIF: side by side
| CISS (C3is Inc.) | SIF (SIFCO Industries, Inc.) | |
|---|---|---|
| 1-year return | -99.5% | +232.2% |
| 5-year return | n/a | +174.7% |
| Volatility (ann.) | 2098.5% | 76.9% |
| Beta vs S&P 500 | 2.24 | 0.80 |
| Max drawdown (3Y) | -100.0% | -57.3% |
| Market cap | – | – |
| P/E (trailing) | – | 35.5 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | CISS | SIF |
|---|---|---|
| 2022 | – | -66.8% |
| 2023 | – | +110.2% |
| 2024 | -98.9% | -21.8% |
| 2025 | -97.3% | +57.2% |
| 2026 | -93.4% | +300.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CISS and SIF good diversifiers for each other?
Yes. With a correlation of -0.23, CISS and SIF have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
FAQ
What is the correlation between CISS and SIF?
As of 2026-08-27, the correlation of weekly returns between CISS and SIF is -0.23 over 3 years, -0.35 over 1 year and n/a over 5 years.
Is SIF a good diversifier for CISS?
Yes. With a correlation of -0.23, CISS and SIF have moved largely independently, which makes them a genuinely diversifying pair by historical standards.
What does a correlation of -0.23 mean?
A reading of -0.23 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/ciss-vs-sif.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/ciss-vs-sif/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: CISS correlations · SIF correlations
