WINCHESTER BANCORP INC WSBK
COM · Common Stock · CUSIP 97269D103
- SectorFinancials
- IndustrySavings Institutions, Not Federally Chartered
- HeadquartersWinchester, MA
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Shares outstanding: 9.3m as of 2026-05-13, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $13.13.
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q2 2025 | 19 |
| Q3 2025 | 22 |
| Q4 2025 | 21 |
| Q1 2026 | 19 |
| Q2 2026 | 21 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2025 | 9 | 7 |
| Q4 2025 | 8 | 8 |
| Q1 2026 | 3 | 6 |
| Q2 2026 | 10 | 6 |
Biggest buyers
| Integrated Wealth Concepts LLC | Added | +25.0k |
| GEODE CAPITAL MANAGEMENT, LLC | Added | +15.1k |
| BlackRock, Inc. | New | +14.2k |
| RFG - Bristol Wealth Advisors, LLC | New | +10.2k |
| Sachetta, LLC | New | +8.0k |
| ROYAL BANK OF CANADA | New | +2.0k |
| EASTERN BANK | Added | +1.5k |
| RENAISSANCE TECHNOLOGIES LLC | Added | +400 |
| VANGUARD FIDUCIARY TRUST CO | Added | +146 |
| OSAIC HOLDINGS, INC. | New | +16 |
Biggest sellers
| M3F, Inc. | Sold out | -24.6k |
| MILLENNIUM MANAGEMENT LLC | Sold out | -11.5k |
| MORGAN STANLEY | Sold out | -4.0k |
| VANGUARD CAPITAL MANAGEMENT LLC | Reduced | -2.6k |
| Tower Research Capital LLC (TRC) | Reduced | -137 |
| UBS Group AG | Reduced | -111 |
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
Winchester Bancorp, MHC
13D · may seek influence
new · filed 2025-05-14
Stated purposeWhile the Reporting Person intends to exercise its rights as majority stockholder of the Issuer, neither the Reporting Person nor any of the Insiders currently has any plans or proposals which relate to or would result in: (a) the acquisition by any person of additional securities of the Issuer or the disposition of securities of the Issuer; (b) an extraordinary corporate transaction, such as a merger, reorganization or liquidation, involving the Issuer or any of its subsidiaries; (c) a sale or transfer of a material amount of assets of the Issuer or any of its subsidiaries; (d) any change in the present Board of Directors or management of the Issuer, including any plans or proposals to change the number or term of directors or to fill any existing vacancies on the Board; (e) any material… Full filing |
55.0% |
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 0 | — | 0 | — | — |
| Q2 2025 | 2 | $495.0k | 0 | — | — |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 0 | — | 0 | — | — |
| Q1 2026 | 0 | — | 0 | — | — |
| Q2 2026 | 4 | $145.3k | 0 | — | — |
| Q3 2026 | 0 | — | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-05-26 | Merritt Edward J Director · By IRA | Bought | $11.7k915 shares |
| 2026-05-21 | Carroll John A President & CEO, director · By Spouse as custodian for child | Bought | $63850 shares |
| 2026-05-07 | Snow John Ingalls III Director | Bought | $22.1k1.7k shares |
| 2026-05-05 | Snow John Ingalls III Director | Bought | $78.6k6.1k shares |
| 2026-05-01 | Boodakian Stephen Harry Director · By IRA | Bought | $32.3k2.5k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| MANGROVE PARTNERS IM, LLC 0.16% of their portfolio | 186.2k $2.4m | Unchanged |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 178.9k $2.4m | Reduced -2.6k |
| Integrated Wealth Concepts LLC 0.01% of their portfolio | 82.0k $1.1m | Added +25.0k |
| Northstar Financial Companies, Inc. 0.62% of their portfolio | 70.0k $919.8k | Unchanged |
| Oppenheimer & Close, LLC 0.41% of their portfolio | 50.0k $657.0k | Unchanged |
| RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio | 31.4k $412.6k | Added +400 |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 29.0k $381.8k | Added +15.1k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 24.7k $313.1k | Unchanged |
| VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio | 22.7k $298.4k | Added +146 |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 20.0k $262.8k | Unchanged |
| Steward Partners Investment Advisory, LLC 0.00% of their portfolio | 19.1k $251.3k | Unchanged |
| EagleClaw Capital Managment, LLC 0.03% of their portfolio | 16.0k $210.2k | Unchanged |
| LPL Financial LLC 0.00% of their portfolio | 15.5k $203.7k | Unchanged |
| BlackRock, Inc. 0.00% of their portfolio | 14.2k $186.6k | New |
| RFG - Bristol Wealth Advisors, LLC 0.03% of their portfolio | 10.2k $133.5k | New |
| Sachetta, LLC 0.05% of their portfolio | 8.0k $105.1k | New |
| EASTERN BANK 0.00% of their portfolio | 4.0k $52.6k | Added +1.5k |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 2.0k $26.0k | New |
| Tower Research Capital LLC (TRC) 0.00% of their portfolio | 157 $2.1k | Reduced -137 |
| UBS Group AG 0.00% of their portfolio | 18 $237 | Reduced -111 |
| OSAIC HOLDINGS, INC. 0.00% of their portfolio | 16 $210 | New |