Winchester Bancorp, Inc./MD/ - WSBK
Detailed investor-level table based on 13F positions.
Early Q1 2026 data: only 1 institutional holders reported so far. The full shareholder list will grow as more funds file with the SEC.
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 | Reduced | 186,201 | 1,945 | 0.16% | 0.13% | 1 | -748 | -0.4% | Q4 2025 | Feb 17, 2026 |
| M3F, Inc. | History | Added to | 143,986 | 1,505 | 0.41% | 0.22% | 2 | +61,434 | 74.42% | Q4 2025 | Feb 13, 2026 |
| VANGUARD GROUP INC | History | Added to | 71,736 | 749 | 0.0% | 0.0% | 3 | +2,569 | 3.71% | Q4 2025 | Jan 29, 2026 |
| M3 Wealth Management, LLC | History | New | 70,000 | 731 | 0.58% | — | 5 | +70,000 | New | Q4 2025 | Feb 09, 2026 |
| Northstar Financial Companies, Inc. | History | No change | 70,000 | 731 | 0.58% | 0.62% | 4 | 0 | 0.0% | Q4 2025 | Feb 09, 2026 |
| Integrated Wealth Concepts LLC | History | Added to | 57,000 | 595 | 0.01% | 0.0% | 6 | +2,000 | 3.64% | Q4 2025 | Feb 13, 2026 |
| Oppenheimer & Close, LLC | History | No change | 50,000 | 522 | 0.36% | 0.32% | 7 | 0 | 0.0% | Q4 2025 | Feb 10, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | History | New | 26,502 | 276 | 0.0% | — | 8 | +26,502 | New | Q4 2025 | Feb 12, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Added to | 26,502 | 276 | 0.0% | 0.0% | 9 | +2,606 | 10.91% | Q4 2025 | Feb 09, 2026 |
| ALLIANCEBERNSTEIN L.P. | History | New | 24,656 | 257 | 0.0% | — | 10 | +24,656 | New | Q4 2025 | Feb 17, 2026 |
| CITADEL ADVISORS LLC | History | Reduced | 20,999 | 219 | 0.0% | 0.0% | 11 | -5,439 | -20.57% | Q4 2025 | Feb 17, 2026 |
| RAYMOND JAMES FINANCIAL INC | History | No change | 20,000 | 209 | 0.0% | 0.0% | 12 | 0 | 0.0% | Q4 2025 | Feb 18, 2026 |
| Steward Partners Investment Advisory, LLC | History | Added to | 19,127 | 199 | 0.0% | 0.0% | 13 | +8,377 | 77.93% | Q4 2025 | Feb 12, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | Reduced | 16,082 | 168 | 0.0% | 0.0% | 14 | -2,865 | -15.12% | Q4 2025 | Feb 17, 2026 |
| EagleClaw Capital Managment, LLC | History | No change | 16,000 | 167 | 0.02% | 0.02% | 15 | 0 | 0.0% | Q4 2025 | Feb 10, 2026 |
| LPL Financial LLC | History | No change | 15,500 | 161 | 0.0% | 0.0% | 16 | 0 | 0.0% | Q4 2025 | Feb 11, 2026 |
| MORGAN STANLEY | History | No change | 4,000 | 41 | 0.0% | 0.0% | 17 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| EASTERN BANK | History | No change | 2,500 | 26 | 0.0% | 0.0% | 18 | 0 | 0.0% | Q4 2025 | Jan 14, 2026 |
| Tower Research Capital LLC (TRC) | History | Reduced | 255 | 2 | 0.0% | 0.0% | 20 | -100 | -28.17% | Q4 2025 | Feb 17, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Added to | 227 | 2 | 0.0% | 0.0% | 19 | +2 | 0.89% | Q4 2025 | Feb 17, 2026 |
| Stilwell Value LLC | History | Closed out | 0 | 0 | — | 0.11% | — | -25,000 | -100.0% | Q3 2025 | Nov 14, 2025 |
| LYNCH & ASSOCIATES/IN | History | Closed out | 0 | 0 | — | 0.02% | — | -13,183 | -100.0% | Q3 2025 | Oct 07, 2025 |
| Benin Management CORP | History | Closed out | 0 | 0 | — | 0.02% | — | -10,000 | -100.0% | Q3 2025 | Oct 20, 2025 |
| UBS Group AG | History | Reduced | 3 | 0 | — | 0.0% | — | -7,798 | -99.96% | Q4 2025 | Jan 29, 2026 |
| CITIGROUP INC | History | No change | 1 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |