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Buy Day today: Neutral (56) Mixed market breadth · no major macro event
WSBK

Winchester Bancorp, Inc.

Financial Services · Banks - Regional

12.70$ +0.3% vs. previous close Closing price · As of: Sep 25, 2026

Ownership

Ownership Structure

Who owns Winchester Bancorp, Inc. (WSBK)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 42.2% of the shares are freely tradable; institutional investors hold 8.4%.

Institutional ownership ?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings. 8.4%
Insiders ?Share of the stock held by the executives, founders and major shareholders of the company itself. 59.3%
Float ?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders. 42.2%
Short % of float ?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices. 0.4%
Shares Outstanding ?Total number of shares issued. Price times share count gives market cap. 9Mio.

Largest Shareholders

Institutions

Institutions WSBK
Name Stake (%) Shares Change (%) Date
Mangrove Partners 2.08 186,201 +0.0 03/31/2026
Vanguard Capital Management, LLC 2.03 181,513 +0.0 03/31/2026
Integrated Wealth Concepts LLC 0.92 82,000 +43.9 06/30/2026
Northstar Financial Companies, INC. 0.78 70,000 +0.0 06/30/2026
Oppenheimer & Close Inc 0.56 50,000 +0.0 06/30/2026
Renaissance Technologies Corp 0.35 31,000 +17.0 03/31/2026
AllianceBernstein L.P. 0.28 24,656 +0.0 03/31/2026
M3F, Inc. 0.27 24,586 -82.9 03/31/2026
Vanguard Fiduciary Trust Co 0.25 22,562 +0.0 03/31/2026

Funds

Funds WSBK
Name Stake (%) Shares Change (%) Date
Vanguard MStar Total Stk Mkt Idx Invest 1.47 132,140 +0.0 08/31/2026

Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.

Data as of: September 25, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)

Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.

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