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Rein Therapeutics

RNTX on Nasdaq. Market value $71m.

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Who owns it

1 long-term investor we follow owns it, unchanged from 1 last quarter. 60 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

6 investors own more than 5%.

  • BIOS CAPITAL MANAGEMENT, LP
    Passive investor
    at least 10.0%
    (filed with 23 related holders)
    Since 6 May 2026
  • Funicular Funds, LP
    Passive investor
    at least 6.7%
    (filed with 2 related holders)
    Since 1 May 2026
  • Voss Capital
    Passive investor
    at least 6.6%−10.4 pts
    (filed with 4 related holders)
    Since 30 June 2026
  • Benjamin Shapiro
    Passive investor
    6.1%
    Since 4 May 2026
  • at least 5.3%
    (filed with 1 related holder)
    Since 30 June 2026
  • Lynwood Capital Management Inc.
    Passive investor
    at least 5.0%−1.1 pts
    (filed with 2 related holders)
    Since 30 June 2026
  • LYTTON LAURENCE W
    Passive investor
    Sold down below 5%
    Since 30 June 2026

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

What insiders did

In the last 12 months, 2 insiders bought $74,701 of shares on the open market.

  • VON RICKENBACH JOSEF H
    Director
    Bought
    Date
    27 May 2026
    Shares
    4,500
    Price
    $1.07
    Value
    $4,815
  • VON RICKENBACH JOSEF H
    Director
    Bought
    Date
    26 May 2026
    Shares
    23,190
    Price
    $1.06
    Value
    $24,581
  • VON RICKENBACH JOSEF H
    Director
    Bought
    Date
    22 May 2026
    Shares
    15,950
    Price
    $1.05
    Value
    $16,748
  • VON RICKENBACH JOSEF H
    Director
    Bought
    Date
    21 May 2026
    Shares
    3,420
    Price
    $1.04
    Value
    $3,557
  • WINDSOR JAMES BRIAN
    See Remarks, Director
    Bought
    Date
    30 April 2026
    Shares
    25,000
    Price
    $1.00
    Value
    $25,000

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.