ETF Overlap Tool
Enter up to six ETFs to see how much of each is the same securities. Overlap by weight is the sum, over every holding two funds share, of the smaller of the two weights: 100% means identical portfolios, 0% means nothing in common.
Overlap by weight
14 holdings in all 2 funds| Fund | BOAT | SEA | Positions | Holdings |
|---|---|---|---|---|
| BOATSonicShares Global Shipping ETF | — | 35% 14 shared |
51 | as of Jun 30, 2026SEC filing |
| SEAU.S. Global Sea to Sky Cargo ETF | 35% 14 shared | — | 29 | as of Jun 30, 2026SEC filing |
Each cell: overlap by weight, and how many positions the two funds share. Equity, preferred and fund holdings are compared; cash and derivatives are not.
Held by both funds
35.2% common weight| Holding | BOAT | SEA | Smallest |
|---|---|---|---|
| SITC International Holdings Co | 4.75% | 4.85% | 4.75% |
| OOIL | 4.72% | 4.93% | 4.72% |
| International Seaways Inc | 4.08% | 4.87% | 4.08% |
| Wallenius Wilhelmsen ASA | 4.07% | 4.90% | 4.07% |
| COSCO SHIPPING Holdings Co Ltd | 3.86% | 4.89% | 3.86% |
| Scorpio Tankers Inc | 3.86% | 3.75% | 3.75% |
| Hafnia Ltd | 3.73% | 1.90% | 1.90% |
| Hoegh Autoliners ASA | 1.84% | 3.80% | 1.84% |
| DHT Holdings Inc | 1.75% | 5.12% | 1.75% |
| Danaos Corp | 1.47% | 1.96% | 1.47% |
| Teekay Tankers Ltd | 1.28% | 1.86% | 1.28% |
| Global Ship Lease Inc | 0.89% | 4.03% | 0.89% |
| Teekay Corp Ltd | 0.57% | 3.48% | 0.57% |
| Euroseas Ltd | 0.31% | 1.90% | 0.31% |
Reading overlap
Two funds with 80% overlap move together and holding both mostly doubles one exposure and both fees. Low overlap is not the same as diversification: two funds can share no holdings and still be driven by the same factor. To see what a whole portfolio owns, use the portfolio x-ray.
Holdings come from each issuer's daily file where we have one and otherwise from the fund's latest SEC filing, so the two sides of a comparison can be from different dates. The table shows each fund's date.
Fund data comes from each fund's SEC filings and issuer disclosures and is shown with the date it is as of. SEC portfolio and flow filings become public about 60 days after the period they cover. Nothing here is investment advice; see Terms.