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Serina Therapeutics

SER on NYSEAmerican. Market value $52m.

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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

2 investors own more than 5%.

  • Juvenescence Limited
    Passive investor
    at least 27.3%
    (filed with 1 related holder)
    Since 20 March 2026
  • 6.7%
    Since 31 March 2026

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 $77,955 of shares on the open market. 1 sold $501,467, $501,467 of it under preset trading plans.

  • Brannan Stephen K.
    Director
    Bought
    Date
    7 July 2026
    Shares
    1,000
    Price
    $2.03
    Value
    $2,030
  • WILSON KAREN J
    Director
    Bought
    Date
    12 June 2026
    Shares
    5,000
    Price
    $1.77
    Value
    $8,850
  • WILSON KAREN J
    Director
    Bought
    Date
    11 June 2026
    Shares
    5,100
    Price
    $1.75
    Value
    $8,925
  • Venkatesan Jay
    Director
    Bought
    Date
    22 May 2026
    Shares
    589
    Price
    $1.78
    Value
    $1,048
  • WILSON KAREN J
    Director
    Bought
    Date
    22 May 2026
    Shares
    10,000
    Price
    $1.93
    Value
    $19,300
  • WILSON KAREN J
    Director
    Bought
    Date
    21 May 2026
    Shares
    10,000
    Price
    $1.77
    Value
    $17,700
  • Marshall Richard Peter
    Director
    Bought
    Date
    19 May 2026
    Shares
    12,183
    Price
    $1.65
    Value
    $20,102
  • Moreadith Randall
    Chief Scientific Officer
    Sold
    under a preset trading plan
    Date
    23 March 2026
    Shares
    6,500
    Price
    $2.86
    Value
    $18,590
  • Moreadith Randall
    Chief Scientific Officer
    Sold
    under a preset trading plan
    Date
    19 March 2026
    Shares
    39,000
    Price
    $2.50
    Value
    $97,500
  • Moreadith Randall
    Chief Scientific Officer
    Sold
    under a preset trading plan
    Date
    2 February 2026
    Shares
    6,500
    Price
    $3.03
    Value
    $19,695

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

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.