Winchester Bancorp, Inc./MD/ - WSBK
Detailed investor-level table based on 13F positions.
Methodology:
Market value and % of portfolio use SEC reported VALUE ($000).
For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received.
Details.
Rows: 0
| Investor | History | Status | Shares held | Market value ($000) | % of portfolio | Previous % | Rank | Change in shares | % change in shares | Source | Date reported |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MANGROVE PARTNERS IM, LLC | History | No change | 186,201 | 2,364 | 0.19% | 0.16% | 1 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | History | New | 181,513 | 2,305 | 0.0% | — | 2 | +181,513 | New | Q1 2026 | May 15, 2026 |
| Northstar Financial Companies, Inc. | History | No change | 70,000 | 889 | 0.71% | 0.58% | 3 | 0 | 0.0% | Q1 2026 | May 05, 2026 |
| VANGUARD GROUP INC | History | No change | 71,736 | 749 | 0.0% | 0.0% | 4 | 0 | 0.0% | Q4 2025 | Jan 29, 2026 |
| Integrated Wealth Concepts LLC | History | No change | 57,000 | 723 | 0.01% | 0.01% | 5 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| Oppenheimer & Close, LLC | History | No change | 50,000 | 635 | 0.4% | 0.36% | 6 | 0 | 0.0% | Q1 2026 | May 12, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | History | Added to | 31,000 | 393 | 0.0% | 0.0% | 7 | +4,498 | 16.97% | Q1 2026 | May 14, 2026 |
| M3F, Inc. | History | Reduced | 24,586 | 312 | 0.08% | 0.41% | 8 | -119,400 | -82.92% | Q1 2026 | Apr 28, 2026 |
| VANGUARD FIDUCIARY TRUST CO | History | New | 22,562 | 286 | 0.0% | — | 9 | +22,562 | New | Q1 2026 | May 08, 2026 |
| ALLIANCEBERNSTEIN L.P. | History | No change | 24,656 | 257 | 0.0% | 0.0% | 10 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| RAYMOND JAMES FINANCIAL INC | History | No change | 20,000 | 254 | 0.0% | 0.0% | 11 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| Steward Partners Investment Advisory, LLC | History | No change | 19,127 | 242 | 0.0% | 0.0% | 12 | 0 | 0.0% | Q1 2026 | May 08, 2026 |
| EagleClaw Capital Managment, LLC | History | No change | 16,000 | 203 | 0.03% | 0.02% | 13 | 0 | 0.0% | Q1 2026 | May 08, 2026 |
| LPL Financial LLC | History | No change | 15,500 | 196 | 0.0% | 0.0% | 14 | 0 | 0.0% | Q1 2026 | May 06, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Reduced | 13,920 | 177 | 0.0% | 0.0% | 15 | -12,582 | -47.48% | Q1 2026 | May 15, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | Reduced | 11,543 | 146 | 0.0% | 0.0% | 16 | -4,539 | -28.22% | Q1 2026 | May 15, 2026 |
| MORGAN STANLEY | History | No change | 4,000 | 50 | 0.0% | 0.0% | 17 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| EASTERN BANK | History | No change | 2,500 | 31 | 0.0% | 0.0% | 18 | 0 | 0.0% | Q1 2026 | Apr 07, 2026 |
| Tower Research Capital LLC (TRC) | History | Added to | 294 | 3 | 0.0% | 0.0% | 19 | +39 | 15.29% | Q1 2026 | May 15, 2026 |
| UBS Group AG | History | Added to | 129 | 1 | 0.0% | — | 20 | +126 | 4200.0% | Q1 2026 | May 05, 2026 |
| CITADEL ADVISORS LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -20,999 | -100.0% | Q1 2026 | May 15, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Closed out | 0 | 0 | — | 0.0% | — | -227 | -100.0% | Q1 2026 | May 15, 2026 |
| CITIGROUP INC | History | Closed out | 0 | 0 | — | — | — | -1 | -100.0% | Q1 2026 | May 11, 2026 |