MBI vs OSG: Correlation
Measured on weekly returns over the past three years, MBIA Inc. (MBI) and Octave Specialty Group, Inc. (OSG) carry a correlation of 0.40, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are MBI and OSG?
Over the past 3 years, MBI and OSG moved with a correlation of 0.40, which is moderate. Recent behaviour matches the longer record: 0.46 over 1 year against 0.40 over 3. Over 5 years the correlation is 0.44, and the annualized covariance of weekly returns is 1428.3 %².
By 3-year correlation, OSG places #7 of the 13 assets tracked against MBI. On 12-month performance MBI holds a 8.0-point edge, -41.0% against -49.0%.
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.
MBI vs OSG: side by side
| MBI (MBIA Inc.) | OSG (Octave Specialty Group, Inc.) | |
|---|---|---|
| 1-year return | -41.0% | -49.0% |
| 5-year return | -0.5% | -68.2% |
| Volatility (ann.) | 68.8% | 51.8% |
| Beta vs S&P 500 | 0.81 | 0.86 |
| Max drawdown (3Y) | -51.9% | -78.5% |
| Market cap | $0.2B | $0.2B |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | MBI | OSG |
|---|---|---|
| 2022 | -18.6% | +8.7% |
| 2023 | +9.2% | -5.5% |
| 2024 | +5.6% | -23.2% |
| 2025 | +10.8% | -38.5% |
| 2026 | -33.0% | -42.0% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are MBI and OSG good diversifiers for each other?
Reasonably. At 0.40, MBI and OSG keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between MBI and OSG?
Using weekly returns as of 2026-08-27: 0.40 over 3 years, with 0.46 over the last year and 0.44 over 5 years.
Is OSG a good diversifier for MBI?
Reasonably. At 0.40, MBI and OSG keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.40 mean?
A reading of 0.40 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/mbi-vs-osg.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/mbi-vs-osg/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: MBI correlations · OSG correlations
