目前共有 7 家機構持有 NTIOF，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 |
|---|---|---|
| Cardinal Capital Management, Inc. | US$9789.9萬 | 2.64% |
| Mn Services Vermogensbeheer B.V. | US$1934.6萬 | 0.13% |
| YOUSIF CAPITAL MANAGEMENT, LLC | US$58.3萬 | 0.01% |
| JOHN G ULLMAN & ASSOCIATES INC | US$41.9萬 | 0.06% |
| PNC FINANCIAL SERVICES GROUP, INC. | US$21.5萬 | 0.00% |
| Coston, McIsaac & Partners | US$3.5萬 | 0.01% |
| GAMMA Investing LLC | US$777.0 | 0.00% |