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Winchester Bancorp

WSBK on Nasdaq. Market value $120m.

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Should I look at this?

We have not checked this company yet

This is not advice.

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Who owns it

None of the long-term investors we follow own it. 21 funds in all.

Jun '25
Dec '25
Jun '26
Largest holders overall

From 13F filings for the quarter ended 30 June 2026.

Big holders and activists

1 investor owns more than 5%.

  • Winchester Bancorp, MHC
    Insider or founder
    55.0%
    Since 30 April 2025
    What they said

    While the Reporting Person intends to exercise its rights as majority stockholder of the Issuer, neither the Reporting Person nor any of the Insiders currently has any plans or proposals which relate to or would result in: (a) the acquisition by any person of additional…

    Read the filing

From Schedule 13D and 13G filings: anyone owning more than 5% must file one.

What insiders did

In the last 12 months, 4 insiders bought $145,332 of shares on the open market.

  • Merritt Edward J
    Director
    Bought
    Date
    26 May 2026
    Shares
    915
    Price
    $12.76
    Value
    $11,675
  • Carroll John A
    President & CEO, Director
    Bought
    Date
    21 May 2026
    Shares
    50
    Price
    $12.75
    Value
    $638
  • Snow John Ingalls III
    Director
    Bought
    Date
    7 May 2026
    Shares
    1,725
    Price
    $12.79
    Value
    $22,059
  • Snow John Ingalls III
    Director
    Bought
    Date
    5 May 2026
    Shares
    6,110
    Price
    $12.87
    Value
    $78,636
  • Boodakian Stephen Harry
    Director
    Bought
    Date
    1 May 2026
    Shares
    2,500
    Price
    $12.93
    Value
    $32,325

From Form 4 filings: insiders must report trades in their own company's shares within two days.

Warning signs in its filings

Problems the company itself reported to the SEC, in its own words.

None of the warning signs we check for were found.

We look for five warning signs: doubt it can keep going, weak checks on its own accounts, a notice that its past accounts can't be relied on, a change of auditor, and one customer bringing in a big share of sales. We don't check lawsuits, investigations or debt yet.

We checked the auditor's report, internal controls, restatement notices, auditor changes and big customers in the 10-K filed 16 Sep 2026, plus 1 later 8-K.

A 10-K is the yearly report every US company files with the SEC. An 8-K is a short notice of a big event.

The deep dive

Everything above is arithmetic on public filings. The deep dive reads the last ten years of annual reports, the proxy statements, and the earnings calls, then argues the case the way Buffett, Klarman, and Hohn would, and checks every claim against the source.

  • What the business is worth, as a range, and the margin of safety at today’s price
  • Prices to start buying, buy, and buy hard
  • The three things that would make this a mistake
  • Every number footnoted to the filing it came from
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What a finished deep dive looks like

Not advice. Numbers on this page come from SEC filings and are updated each night; prices are updated again after the US market closes. The five-year figures are rounded.