目前共有 158 家機構持有 MBX，以下依持股市值由高至低排序。
| 主要持有機構 | 總市值 | 平均佔比 |
|---|---|---|
| Fortitude Family Office, LLC | US$567.0 | 0.00% |
| Keating Financial Advisory Services, Inc. | US$478.0 | 0.00% |
| Essential Partners LLC | US$448.0 | 0.00% |
| Farther Finance Advisors, LLC | US$291.0 | 0.00% |
| MAI Capital Management | US$209.0 | 0.00% |
| True Wealth Design, LLC | US$60.0 | 0.00% |
| IFP Advisors, Inc | US$30.0 | 0.00% |
| Covestor Ltd | US$0.0 | 0.00% |