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Winchester Bancorp, Inc. Common Stock (WSBK) institutional ownership

Market cap$91M SectorFinancial Services
Funds holding · Q1 2026
11
reported WSBK position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Activity unavailable N/A
4 buyers · 7 sellers

Winchester Bancorp, Inc. Common Stock (WSBK) price and institutional activity

Dates

Q1 2026

$0 bought by 4 investors
VanguardRenaissance Technologies LLC +2 more
$0 sold by 7 investors
M3f, Inc.M3 Wealth Management, LLC +5 more
Sign in to see who bought
Bought Sold Totals per quarter; hover a bar for the names.

Winchester Bancorp, Inc. Common Stock (WSBK) institutional activity · 11

Investor Type Est. change Change Δ Own Date
Vanguard · Added
Change +132K Date Q1 2026
Vanguard Added· Q1 2026 +132K Q1 2026
M3f, Inc. · Reduced
Change −119K Date Q1 2026
M3f, Inc. Reduced· Q1 2026 −119K Q1 2026
M3 Wealth Management, LLC · Exited
Change −70K Δ Own −100.0% Date Q1 2026
M3 Wealth Management, LLC Exited· Q1 2026 −70K −100.0% Q1 2026
Citadel Advisors LLC Exited· Q1 2026 −21K −100.0% Q1 2026
Geode · Reduced
Change −13K Date Q1 2026
Geode Reduced· Q1 2026 −13K Q1 2026
Millennium Management LLC · Reduced
Change −5K Date Q1 2026
Millennium Management LLC Reduced· Q1 2026 −5K Q1 2026
Renaissance Technologies LLC Added· Q1 2026 +4K +17.0% Q1 2026
Bank of America Corp · Exited
Change −227 Δ Own −100.0% Date Q1 2026
Bank of America Corp Exited· Q1 2026 −227 −100.0% Q1 2026
UBS Group AG · Added
Change +126 Date Q1 2026
UBS Group AG Added· Q1 2026 +126 Q1 2026
Tower Research Capital LLC (trc) · Added
Change +39 Date Q1 2026
Tower Research Capital LLC (trc) Added· Q1 2026 +39 Q1 2026
Citigroup Inc · Exited
Change −1 Δ Own −100.0% Date Q1 2026
Citigroup Inc Exited· Q1 2026 −1 −100.0% Q1 2026
Data through Q1 2026 · filed May 15, 2026
11 of 11

Famous investor activity in Winchester Bancorp, Inc. Common Stock (WSBK)

Winchester Bancorp, Inc. Common Stock (WSBK) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Merritt Edward J. · Director Buy +$12K
Price $12.76 Qty +915 Owned 21K Trade date May 26, 2026 Filed date May 27, 2026
Merritt Edward J. Director Buy $12.76 +915 +$12K 21K May 26, 2026 May 27, 2026
Carroll John A. · Director Buy +$638
Price $12.75 Qty +50 Owned 50 Trade date May 21, 2026 Filed date May 22, 2026
Carroll John A. Director Buy $12.75 +50 +$638 50 May 21, 2026 May 22, 2026
Snow John Ingalls III · Director 2 operations +$22K
Price $12.77–$12.79 Qty +2K Owned 20K Trade date May 7, 2026 Filed date May 8, 2026
Snow John Ingalls III Director 2 operations $12.77–$12.79 +2K +$22K 20K May 7, 2026 May 8, 2026
Snow John Ingalls III · Director Buy +$79K
Price $12.87 Qty +6K Owned 19K Trade date May 5, 2026 Filed date May 6, 2026
Snow John Ingalls III Director Buy $12.87 +6K +$79K 19K May 5, 2026 May 6, 2026
Snow John Ingalls III · Director 2 operations -400
Owned 200 Trade date May 5, 2026 Filed date May 6, 2026
Snow John Ingalls III Director 2 operations -400 200 May 5, 2026 May 6, 2026
Boodakian Stephen Harry · Director Buy +$32K
Price $12.93 Qty +2K Owned 2K Trade date May 1, 2026 Filed date May 5, 2026
Boodakian Stephen Harry Director Buy $12.93 +2K +$32K 2K May 1, 2026 May 5, 2026
6 of 6

Winchester Bancorp, Inc. Common Stock (WSBK) activist and large shareholders

What are Schedules 13D and 13G?

Dates
No Schedule 13D or 13G filing is available for WSBK in this range.

Winchester Bancorp, Inc. Common Stock (WSBK) ownership FAQ

Who owns WSBK?

11 reporting institutions disclosed WSBK position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.