Winchester Bancorp Ownership | Who Owns Winchester Bancorp?

Winchester Bancorp Ownership Summary

Winchester Bancorp is owned by 4.48% institutional investors, 59.26% insiders, and 36.26% retail investors. Mangrove partners is the largest institutional shareholder, holding 2.08% of WSBK shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 1.47% of its assets in Winchester Bancorp shares.

WSBK Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Winchester Bancorp	4.48%	59.26%	36.26%
Industry	Regional Banks Stocks	38.86%	12.63%	48.51%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Mangrove partners	186.20K	2.08%	$2.36M
Northstar financial companies	70.00K	0.78%	$889.00K
Integrated wealth concepts	57.00K	0.64%	$723.90K
Oppenheimer & close	50.00K	0.56%	$635.00K
Renaissance	31.00K	0.35%	$393.70K
Alliancebernstein	24.66K	0.28%	$257.65K
M3f	24.59K	0.27%	$312.00K
Vanguard fiduciary trust	22.56K	0.25%	$286.54K
Raymond james financial	20.00K	0.22%	$254.00K
Steward partners investment advisory	19.13K	0.21%	$242.91K

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Northstar financial companies	70.00K	0.71%	$889.00K
Oppenheimer & close	50.00K	0.40%	$635.00K
Mangrove partners	186.20K	0.19%	$2.36M
M3f	24.59K	0.08%	$312.00K
Eagleclaw capital managment	16.00K	0.03%	$203.20K
Integrated wealth concepts	57.00K	0.01%	$723.90K
Steward partners investment advisory	19.13K	0.00%	$242.91K
Renaissance	31.00K	0.00%	$393.70K
Eastern bank	2.50K	0.00%	$31.75K
Raymond james financial	20.00K	0.00%	$254.00K

Top Buyers

Holder	Shares	% Assets	Change
Vanguard fiduciary trust	22.56K	0.00%	22.56K
Renaissance	31.00K	0.00%	4.50K
Ubs group	129.00	-	126.00
Tower research capital llc (trc)	294.00	0.00%	39.00
Steward partners investment advisory	19.13K	0.00%	-

Top Sellers

Holder	Shares	% Assets	Change
M3f	24.59K	0.08%	-119.40K
Citadel advisors	-	-	-21.00K
Geode capital management	13.92K	-	-12.58K
Millennium management	11.54K	0.00%	-4.54K
Citigroup	-	-	-1.00

New Positions

Holder	Shares	% Assets	Change	Value
Vanguard fiduciary trust	22.56K	0.00%	22.56K	$286.54K

Sold Out

Holder	Change
Citigroup	-1.00
Citadel advisors	-21.00K

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Mar 31, 2026	10	-54.55%	401,917	-52.23%	4	5.09%	3	-66.67%	1	-80.00%
Dec 31, 2025	22	-	841,277	18.78%	9	15.03%	9	-	5	-28.57%
Sep 30, 2025	22	22.22%	708,264	14.19%	7	17.56%	9	-50.00%	7	-
Jun 30, 2025	18	-	620,236	-	6	-	18	-	-	-

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Total Stock Mkt Idx Inv	132.14K	1.47%	-
Vanguard Institutional Extnd Mkt Idx Tr	44.67K	0.50%	-
Fidelity Series Total Market Index	6.41K	0.07%	-
Vanguard Balanced Index Inv	4.70K	0.05%	-
Spartan Extended Market Index Pool F	3.91K	0.04%	-
NT Ext Equity Mkt Index Fund - Lending	3.69K	0.04%	-
Northern Trust Extended Eq Market Idx	3.69K	0.04%	-
Vanguard Instl Ttl Stck Mkt Index Trust	2.90K	0.03%	-
Spartan Total Market Index Pool G	2.63K	0.03%	-
NT Ext Equity Mkt Index Fund - NL	2.11K	0.02%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
May 26, 2026	Merritt Edward J	-	Buy	$11.68K
May 21, 2026	Carroll John A	President & CEO	Buy	$637.50
May 07, 2026	Snow John Ingalls III	-	Buy	$2.55K
May 07, 2026	Snow John Ingalls III	-	Buy	$19.50K
May 05, 2026	Snow John Ingalls III	-	Buy	$78.64K

Insider Transactions Trends

Date	Buy	Sell
2026 Q2	6	-
2025 Q2	1	-

WSBK Ownership FAQ

Who Owns Winchester Bancorp?

Winchester Bancorp shareholders are primarily institutional investors at 4.48%, followed by 59.26% insiders and 36.26% retail investors. The average institutional ownership in Winchester Bancorp's industry, Regional Banks Stocks, is 38.86%, which Winchester Bancorp falls below.

Who owns the most shares of Winchester Bancorp?

Winchester Bancorp’s largest shareholders are Mangrove partners (186.2K shares, 2.08%), Northstar financial companies (70K shares, 0.78%), and Integrated wealth concepts (57K shares, 0.64%). Together, they hold 3.49% of Winchester Bancorp’s total shares outstanding.

Does Blackrock own Winchester Bancorp?

BlackRock is not among the top 10 institutional shareholders of Winchester Bancorp.

Who is Winchester Bancorp’s biggest shareholder by percentage of total assets invested?

Northstar financial companies is Winchester Bancorp’s biggest shareholder by percentage of total assets invested, with 0.71% of its assets in 70K Winchester Bancorp shares, valued at 889K$.

Who is the top mutual fund holder of Winchester Bancorp shares?

Vanguard Total Stock Mkt Idx Inv is the top mutual fund holder of Winchester Bancorp shares, with 1.47% of its total shares outstanding invested in 132.14K Winchester Bancorp shares.

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