目前共有 16 家機構持有 BSBK，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 |
|---|---|---|
| M3F, Inc. | US$419.7萬 | 1.04% |
| VANGUARD CAPITAL MANAGEMENT LLC | US$146.1萬 | 0.00% |
| GEODE CAPITAL MANAGEMENT, LLC | US$42.9萬 | 0.00% |
| FMR LLC | US$39.4萬 | 0.00% |
| RENAISSANCE TECHNOLOGIES LLC | US$26.6萬 | 0.00% |
| BANK OF AMERICA CORP /DE/ | US$26.2萬 | 0.00% |
| NORTHERN TRUST CORP | US$20.9萬 | 0.00% |
| VANGUARD FIDUCIARY TRUST CO | US$19.4萬 | 0.00% |
| BEESE FULMER INVESTMENT MANAGEMENT, INC. | US$13.0萬 | 0.01% |
| Cetera Investment Advisers | US$12.8萬 | 0.00% |
| BlackRock, Inc. | US$10.3萬 | 0.00% |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | US$2.7萬 | 0.00% |
| UBS Group AG | US$2.3萬 | 0.00% |
| Vanguard Global Advisers, LLC | US$2.0萬 | 0.00% |
| Tower Research Capital LLC (TRC) | US$2354.0 | 0.00% |
| CITIGROUP INC | US$9.0 | 0.00% |