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WSBK · NASDAQ · Banks - Regional

Winchester Bancorp (WSBK)

Operates a community bank serving households and small businesses in eastern Massachusetts.

$12.99

At close+0.02 (+0.15%)

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Breakdown13F · 13D/G · Form 4

Institutions21 holders · as of Jun 30, 2026	8.44%	784.1K shares
Insiders8 holders · as of May 27, 2026	56.50%	5.25M shares
Otherremainder	35.06%	3.26M shares

9.30M company shares as of Sep 3, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing

Top shareholders13F · 13D/G · Form 4

Holder	Stake	Shares	Evidence
Bancorp MHC WinchesterInsider10 percent owner	55.00%	5.11M	13Dfiled May 14, 2025 ↗
Mangrove PartnersInstitution	2.00%	186,201	13Fas of Jun 30, 2026
Vanguard Capital Management LLCInstitution	1.93%	178,941	13Fas of Jun 30, 2026
Integrated Wealth Concepts LLCInstitution	0.88%	82,000	13Fas of Jun 30, 2026
Northstar Financial Companies, Inc.Institution	0.75%	70,000	13Fas of Jun 30, 2026
William Preston HoodInsiderdirector	0.55%	51,050	Form 4filed Jun 10, 2025 ↗
Oppenheimer & Close, LLCInstitution	0.54%	50,000	13Fas of Jun 30, 2026
Renaissance Technologies LLCInstitution	0.34%	31,400	13Fas of Jun 30, 2026
Geode Capital Management, LLCInstitution	0.31%	29,037	13Fas of Jun 30, 2026
Connolly Carole Ann PierceInsiderdirector	0.27%	25,000	Form 4filed May 7, 2025 ↗
AllianceBernstein L.P.Institution	0.27%	24,656	13Fas of Jun 30, 2026
Vanguard Fiduciary Trust CoInstitution	0.24%	22,708	13Fas of Jun 30, 2026
Edward J. MerrittInsiderdirector	0.23%	20,915	Form 4filed May 27, 2026 ↗
Elda HellerInsiderofficer: EVP and CFO	0.22%	20,000	Form 4filed May 7, 2025 ↗
Raymond James Financial IncInstitution	0.22%	20,000	13Fas of Jun 30, 2026
John Ingalls III SnowInsiderdirector	0.21%	19,935	Form 4filed May 8, 2026 ↗
Steward Partners Investment Advisory, LLCInstitution	0.21%	19,127	13Fas of Jun 30, 2026
Eagleclaw Capital Managment, LLCInstitution	0.17%	16,000	13Fas of Jun 30, 2026
LPL Financial LLCInstitution	0.17%	15,500	13Fas of Jun 30, 2026
BlackRock, Inc.Institution	0.15%	14,202	13Fas of Jun 30, 2026
RFG - Bristol Wealth Advisors, LLCInstitution	0.11%	10,158	13Fas of Jun 30, 2026
Sachetta, LLCInstitution	0.09%	8,000	13Fas of Jun 30, 2026
Eastern BankInstitution	0.04%	4,000	13Fas of Jun 30, 2026
Stephen Harry BoodakianInsiderdirector	0.03%	2,500	Form 4filed May 5, 2026 ↗
Royal Bank of CanadaInstitution	0.02%	2,000	13Fas of Jun 30, 2026

13F — a manager's quarterly holdings · 13D/13G — an ownership statement filed at 5% or more · Form 4 — an insider's transaction report

Institutions13F, as of Jun 30, 2026

21 holders · 784.1K shares · 5 new positions · 10 increased · 3 reduced · 3 closed

Holder	Shares	% outstanding	Chg q/q	Filed
Mangrove Partners	186.2K	2.00%	0	Aug 14, 2026
Vanguard Capital Management LLC	178.9K	1.93%	−2.6K	Aug 13, 2026
Integrated Wealth Concepts LLC	82.0K	0.88%	+25.0K	Aug 12, 2026
Northstar Financial Companies, Inc.	70.0K	0.75%	0	Aug 6, 2026
Oppenheimer & Close, LLC	50.0K	0.54%	0	Aug 12, 2026
Renaissance Technologies LLC	31.4K	0.34%	+400	Aug 13, 2026
Geode Capital Management, LLC	29.0K	0.31%	+15.1K	Aug 12, 2026
AllianceBernstein L.P.	24.7K	0.27%	0	Aug 14, 2026

Ownership statements13D/G · 5% or more, as filed

Holder	% of class	Shares	Form	Filed
Winchester Bancorp, MHC	55.00%	5.11M	13D	May 14, 2025 ↗

Insider tradesForm 4

Latest trades

Date	Insider	Type	Shares	Avg price	Owned after
May 26, 2026	Edward J. Merrittdirector	Purchase	915	$12.76	20,915
May 21, 2026	John A. Carrolldirector, officer: President & CEO	Purchase	50	$12.75	50
May 7, 2026	John Ingalls III Snowdirector	Purchase · 2 lots	1,725	$12.79	19,735
May 5, 2026	John Ingalls III Snowdirector	Purchase	6,110	$12.87	18,610
May 1, 2026	Stephen Harry Boodakiandirector	Purchase	2,500	$12.93	2,500

CongressHouse and Senate disclosures

Not reported.