Winchester Bancorp, Inc. Common Stock
Winchester Bancorp, Inc. Common Stock (WSBK) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · WSBK · as of Sep 30, 2025
Ownership Breakdown
22
Institutional Holders
▲ 4 vs Q2
$6.77M
Total Inst. Value
▲ $1.22M vs Q2
8.96M
Shares Outstanding
freeFloat 42.22%
708,264
13F Shares Held
▲ 88,028 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
WSBK largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
MANGROVE PARTNERS savings institutions, not federally chartered | 186.9K | 2.09% | 2.09% | $1.79B | Nov 14, 2025 | ▲ 17.9K |
M3F, INC. savings institutions, not federally chartered | 82.6K | 92.08% | 92.08% | $788.00M | Nov 12, 2025 | ▲ 23.2K |
NORTHSTAR FINANCIAL COMPANIES, INC. savings institutions, not federally chartered | 70.0K | 78.08% | 78.08% | $668.50M | Nov 12, 2025 | NEW |
VANGUARD GROUP INC savings institutions, not federally chartered | 69.2K | 77.15% | 77.15% | $663.31M | Nov 7, 2025 | ▲ 185 |
INTEGRATED WEALTH CONCEPTS LLC savings institutions, not federally chartered | 55.0K | 61.35% | 61.35% | $525.25M | Nov 14, 2025 | — held |
OPPENHEIMER & CLOSE, LLC savings institutions, not federally chartered | 50.0K | 55.77% | 55.77% | $477.50M | Nov 10, 2025 | — held |
CITADEL ADVISORS LLC savings institutions, not federally chartered | 26.4K | 29.49% | 29.49% | $253.54M | Nov 14, 2025 | ▼ 15.5K |
STILWELL VALUE LLC savings institutions, not federally chartered | 25.0K | 27.89% | 27.89% | $238.75M | Nov 14, 2025 | — held |
GEODE CAPITAL MANAGEMENT, LLC savings institutions, not federally chartered | 23.9K | 26.66% | 26.66% | $229.16M | Nov 12, 2025 | ▲ 2.9K |
RAYMOND JAMES FINANCIAL INC savings institutions, not federally chartered | 20.0K | 22.31% | 22.31% | $191.00M | Nov 14, 2025 | — held |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
5
Increased
+52.4K shares4
New Positions
first time holders7
Decreased
−40.9K shares0
Sold Out
fully exitedNet shares change (top 50)
+11.5K
+52.4K / −40.9K
Net new holders
+2
4 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
WSBK insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
7
Buy transactions
1
Sell transactions
7.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Merritt Edward J director | May 26, 2026 | Purchase | 915 | $12.76 | $11.7K | 20.9K | Form 4 ↗ |
Carroll John A President & CEO | May 21, 2026 | Purchase | 50 | $12.75 | $637.5 | 50 | Form 4 ↗ |
Snow John Ingalls III director | May 7, 2026 | Purchase | 200 | $12.77 | $2.6K | 19.7K | Form 4 ↗ |
Snow John Ingalls III director | May 7, 2026 | Purchase | 1,525 | $12.79 | $19.5K | 19.5K | Form 4 ↗ |
Snow John Ingalls III director | May 5, 2026 | Purchase | 6,110 | $12.87 | $78.6K | 18.6K | Form 4 ↗ |
Snow John Ingalls III director | May 5, 2026 | Gift | 600 | — | — | 18.0K | Form 4 ↗ |
Snow John Ingalls III director | May 5, 2026 | Gift | 200 | — | — | 200 | Form 4 ↗ |
Boodakian Stephen Harry director | May 1, 2026 | Purchase | 2,500 | $12.93 | $32.3K | 2.5K | Form 4 ↗ |
Hood William Preston director | Jun 10, 2025 | Purchase | 1,050 | $9.21 | $9.7K | 51.0K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Winchester Bancorp, Inc. Common Stock (WSBK) is primarily owned by institutional investors, who hold approximately 7.9% of total shares outstanding. Company insiders own approximately 57.78%, while retail and public investors account for the remaining 34.31%.
The largest institutional shareholder of Winchester Bancorp, Inc. Common Stock is MANGROVE PARTNERS, holding approximately 186,949 shares — equal to 2.09% of outstanding shares — as of September 30, 2025.
A total of 22 institutional investors currently hold WSBK stock, with a combined institutional value of approximately $6,769,088 as of the most recent 13F filing period.
Frequently asked questions
WSBK ownershipWinchester Bancorp, Inc. Common Stock (WSBK) is primarily owned by institutional investors, who hold approximately 7.9% of shares. The largest shareholder is MANGROVE PARTNERS with a 2.09% stake. Company insiders hold 57.78%. Data sourced from SEC Form 13F as of September 30, 2025.