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Who owns Winchester Bancorp (WSBK) stock

21 funds reported Winchester Bancorp (WSBK) shares in their latest 13F filings, worth $10.0M in all. The largest holder is Mangrove Partners IM, LLC ($2.4M). Last quarter 10 funds added to their stakes and 7 cut them.

Largest holders of WSBK (13F)Largest holders of WSBK (13F)Mangrove Partners IM, LLC$2.4MVanguard Capital Management LLC$2.4MVanguard Group$750KIntegrated Wealth Concepts LLC$749KOppenheimer & Close, LLC$657KRenaissance Technologies LLC$413KGeode Capital Management, LLC$382KRFG - Bristol Wealth Advisors, LLC$355KAlliancebernstein L.P.$313KVanguard Fiduciary Trust$298K

Largest holders (13F)

FundSharesValueChangeQuarter
Mangrove Partners IM, LLC186,201$2.4Munchanged2026-06-30
Vanguard Capital Management LLC178,941$2.4Mdecrease2026-06-30
Vanguard Group71,736$750Kincrease2025-12-31
Integrated Wealth Concepts LLC57,000$749Knew2026-06-30
Oppenheimer & Close, LLC50,000$657Kunchanged2026-06-30
Renaissance Technologies LLC31,400$413Kincrease2026-06-30
Geode Capital Management, LLC29,037$382Kincrease2026-06-30
RFG - Bristol Wealth Advisors, LLC27,500$355Kincrease2026-09-30
Alliancebernstein L.P.24,656$313Kunchanged2026-06-30
Vanguard Fiduciary Trust22,708$298Kincrease2026-06-30
Raymond James Financial20,000$263Kunchanged2026-06-30
Steward Partners Investment Advisory, LLC19,127$251Kunchanged2026-06-30
EagleClaw Capital Managment, LLC16,000$210Kunchanged2026-06-30
LPL Financial LLC15,500$204Kunchanged2026-06-30
BlackRock14,202$187Knew2026-06-30

Winchester Bancorp's latest quarter

Winchester Bancorp, Q3 2026: revenue $7.7M (+33% year over year), operating margin 21.5%, net earnings $1.3M, operating cash flow $2.2M. The chart follows the revenue to costs, profit and cash.

Questions

Who owns the most WSBK stock?

By the latest 13F filings: Mangrove Partners IM, LLC ($2.4M); Vanguard Capital Management LLC ($2.4M); Vanguard Group ($750K); Integrated Wealth Concepts LLC ($749K); Oppenheimer & Close, LLC ($657K).

What is the short interest in WSBK?

15,851 shares were sold short at the 2026-10-15 settlement, -22.73% of the float.

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Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.