Winchester Bancorp, Inc. Common Stock (WSBK) ownership: Winchester Bancorp, MHC. 59% · institutions 7% · index and ETF funds 1% (13F 2026-03-31). Insider activity, 90 days: 0 sales, 0 open-market buys. SEC EDGAR first-party data.
| Holder | Shares | Market Value | % Outstanding | Reported |
|---|---|---|---|---|
| Vanguard | 204075.00 | $2.59M | 2.2% | 2026-03-31 |
| Mangrove Partners Im, LLC | 186201.00 | $2.36M | 2.0% | 2026-03-31 |
| Northstar Financial Companies, Inc. | 70000.00 | $889000.00 | 0.8% | 2026-03-31 |
| Integrated Wealth Concepts LLC | 57000.00 | $723900.00 | 0.6% | 2026-03-31 |
| Oppenheimer | 50000.00 | $635000.00 | 0.5% | 2026-03-31 |
| Renaissance Technologies | 31000.00 | $393700.00 | 0.3% | 2026-03-31 |
| M3F, Inc. | 24586.00 | $312000.00 | 0.3% | 2026-03-31 |
| AllianceBernstein | 24656.00 | $257655.00 | 0.3% | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-26 | |
| Sell | null | 2026-05-21 | |
| Sell | null | 2026-05-07 | |
| Sell | null | 2026-05-07 | |
| Sell | null | 2026-05-05 | |
| Sell | null | 2026-05-05 | |
| Sell | null | 2026-05-05 | |
| Sell | null | 2026-05-01 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.