OII vs VTOL: Correlation
Oceaneering International, Inc. (OII) and Bristow Group, Inc. (VTOL) show a moderate relationship: their 3-year correlation of weekly returns is 0.59.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are OII and VTOL?
Over the past 3 years, OII and VTOL moved with a correlation of 0.59, which is moderate. Lately the two have drifted apart, with the 1-year correlation at 0.43 versus 0.59 over 3 years. Over 5 years the correlation is 0.61, and the annualized covariance of weekly returns is 971.6 %².
By 3-year correlation, VTOL places #9 of the 16 assets tracked against OII. Correlation aside, the last 12 months split them widely, with OII ahead by 88.4 points (+109.9% versus +21.5%).
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.
OII vs VTOL: side by side
| OII (Oceaneering International, Inc.) | VTOL (Bristow Group, Inc.) | |
|---|---|---|
| 1-year return | +109.9% | +21.5% |
| 5-year return | +316.7% | +49.4% |
| Volatility (ann.) | 43.5% | 38.0% |
| Beta vs S&P 500 | 0.81 | 1.00 |
| Max drawdown (3Y) | -47.8% | -35.3% |
| Market cap | $5.1B | $1.4B |
| P/E (trailing) | 14.8 | 13.0 |
| Dividend yield | 0.00% | 0.55% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | OII | VTOL |
|---|---|---|
| 2022 | +54.6% | -14.3% |
| 2023 | +21.7% | +4.2% |
| 2024 | +22.6% | +21.3% |
| 2025 | -7.9% | +6.8% |
| 2026 | +113.1% | +26.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are OII and VTOL good diversifiers for each other?
Only partially. A correlation of 0.59 means OII and VTOL 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 OII and VTOL?
Using weekly returns as of 2026-08-27: 0.59 over 3 years, with 0.43 over the last year and 0.61 over 5 years.
Is VTOL a good diversifier for OII?
Only partially. A correlation of 0.59 means OII and VTOL share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.59 mean?
A reading of 0.59 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/oii-vs-vtol.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/oii-vs-vtol/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: OII correlations · VTOL correlations
