ECO vs IEF: Correlation
Measured on weekly returns over the past three years, Okeanis Eco Tankers Corp. (ECO) and iShares 7-10 Year Treasury Bond ETF (IEF) carry a correlation of -0.26, a negative link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ECO and IEF?
Across a 3-year window, the weekly returns of ECO and IEF correlate at -0.26, negative, meaning they tend to move in opposite directions. The past 12 months show a tighter link (0.05) than the 3-year average (-0.26). Stretching to 5 years gives n/a, with an annualized covariance of -74.9 %².
Out of 13 assets tracked against ECO, IEF lands near the bottom at #13. Correlation aside, the last 12 months split them widely, with ECO ahead by 188.9 points (+189.8% versus +0.9%). Note the risk asymmetry: ECO runs 6.8 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.
ECO vs IEF: side by side
| ECO (Okeanis Eco Tankers Corp.) | IEF (iShares 7-10 Year Treasury Bond ETF) | |
|---|---|---|
| 1-year return | +189.8% | +0.9% |
| 5-year return | n/a | -7.9% |
| Volatility (ann.) | 44.3% | 6.5% |
| Beta vs S&P 500 | 0.52 | 0.04 |
| Max drawdown (3Y) | -46.1% | -6.9% |
| Market cap | $2.6B | – |
| P/E (trailing) | 5.8 | – |
| Dividend yield | 0.00% | 3.96% |
| Expense ratio | – | 0.15% |
| Assets under management | – | $47.2B |
| Sector / category | US Listed | ETF · Bonds |
On the fund side, IEF sits in the Long Government category at iShares, with $47.2B under management, a 0.15% expense ratio, a 3.96% trailing dividend yield.
Year-by-year returns
| Year | ECO | IEF |
|---|---|---|
| 2022 | – | -15.2% |
| 2023 | – | +3.6% |
| 2024 | -11.7% | -0.6% |
| 2025 | +64.2% | +8.0% |
| 2026 | +128.8% | -0.8% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ECO and IEF good diversifiers for each other?
Yes: at -0.26, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between ECO and IEF?
The ECO/IEF correlation stands at -0.26 on a 3-year window (1 year: 0.05, 5 years: n/a), computed from weekly returns as of 2026-08-27.
Is IEF a good diversifier for ECO?
Yes: at -0.26, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of -0.26 mean?
A reading of -0.26 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/eco-vs-ief.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/eco-vs-ief/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: ECO correlations · IEF correlations
