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Auburn National Bancorporation

AUBN on Nasdaq. Market value $92m.

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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. 27 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

3 investors own more than 5%.

  • Anne M. May
    8.3%
    Since 11 September 2025
    What they said

    To reflect the Inheritance Transfers to Recipient Trusts FBO Edward L. Spencer, III. The Reporting Person is the sole Trustee of the Recipient Trusts FBO Edward L. Spencer, III. There are no actions of the type specified in the Instruction to this Item 4 or similar actions…

    Read the filing
  • Sandra J. Spencer
    Insider or founder
    7.4%
    Since 11 September 2025
    What they said

    The transaction reported in this Amendment No. 3 reflects a settlement and distribution to or for the benefit of Ms. Spencer and her two brothers, of Company Shares held in Ms. Spencer's Parents' estates and the trusts they established as part of their estate planning. See…

    Read the filing
  • Bruce Steven Spencer
    Passive investor
    7.2%
    Since 11 September 2025
    What they said

    To reflect the Inheritance Transfers to Recipient Trusts FBO Bruce Steven Spencer. The Reporting Person is the sole Trustee of the Recipient Trusts FBO Bruce Steven Spencer. There are no actions of the type specified in the Instruction to this Item 4 or similar actions…

    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, 6 insiders bought $93,119 of shares on the open market.

Cluster buy4 insiders bought within 30 days (30 September 2026 to 30 September 2026).
  • O'DONNELL SHANNON
    Senior Vice President
    Bought
    Date
    30 September 2026
    Shares
    27
    Price
    $27.53
    Value
    $743
  • HOUSEL DAVID E
    Director
    Bought
    Date
    30 September 2026
    Shares
    51
    Price
    $27.49
    Value
    $1,402
  • Barrett J Tutt
    Director
    Bought
    Date
    30 September 2026
    Shares
    73
    Price
    $27.50
    Value
    $2,007
  • HAM WILLIAM F JR
    Director
    Bought
    Date
    30 September 2026
    Shares
    47
    Price
    $27.41
    Value
    $1,288
  • O'DONNELL SHANNON
    Senior Vice President
    Bought
    Date
    2 July 2026
    Shares
    27
    Price
    $26.54
    Value
    $717
  • HOUSEL DAVID E
    Director
    Bought
    Date
    2 July 2026
    Shares
    53
    Price
    $26.63
    Value
    $1,411
  • HAM WILLIAM F JR
    Director
    Bought
    Date
    2 July 2026
    Shares
    57
    Price
    $26.74
    Value
    $1,524
  • Barrett J Tutt
    Director
    Bought
    Date
    2 July 2026
    Shares
    74
    Price
    $26.62
    Value
    $1,970
  • Hedges David A
    President\CEO, Director
    Bought
    Date
    6 May 2026
    Shares
    1,000
    Price
    $23.75
    Value
    $23,750
  • HOUSEL DAVID E
    Director
    Bought
    Date
    5 May 2026
    Shares
    150
    Price
    $23.96
    Value
    $3,594

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 17 Mar 2026, plus the 10-Q filed 11 Aug 2026 and 7 later 8-Ks.

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

Insiders have been buying together. The deep dive checks whether they know something the price doesn't.

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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.