Prokidney

PROK on Nasdaq. Market value $59m.

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Why it could be worth it

Nothing stands out yet.

Read the warning sign in its own filings

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Who owns it

1 long-term investor we follow owns it, unchanged from 1 last quarter. 71 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%.

  • Tolerantia, LLC
    Insider or founder
    at least 36.5%−1.5 pts
    (filed with 1 related holder)
    Since 3 June 2025
  • Carlos Slim Helu
    Insider or founder
    at least 36.0%
    (filed with 7 related holders)
    Since 28 April 2026
    What they said

    Delaware Domestication On July 1, 2025, the Issuer effected a domestication from the Caymans Islands to the State of Delaware (the "Domestication"). Effective as of July 1, 2025, each (i) Class A ordinary share automatically converted into one share of Class A Common Stock of…

    Read the filing
  • Morgan Stanley
    Passive investor
    at least 4.7%−1.3 pts
    (filed with 1 related holder)
    Since 30 June 2026
  • BlackRock, Inc.
    Passive investor
    Sold down below 5%
    Since 30 June 2025

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

What insiders did

No insider bought shares on the open market in the last 12 months. 1 sold $3m.

  • Pereira Brian JG
    Director
    Sold
    Date
    20 August 2026
    Shares
    250,000
    Price
    $1.42
    Value
    $354,975
  • Pereira Brian JG
    Director
    Sold
    Date
    19 August 2026
    Shares
    250,000
    Price
    $1.44
    Value
    $360,175
  • Pereira Brian JG
    Director
    Sold
    Date
    18 August 2026
    Shares
    257,164
    Price
    $1.37
    Value
    $352,623
  • Pereira Brian JG
    Director
    Sold
    Date
    13 November 2025
    Shares
    502,136
    Price
    $2.37
    Value
    $1m
  • Pereira Brian JG
    Director
    Sold
    Date
    12 November 2025
    Shares
    255,026
    Price
    $2.72
    Value
    $693,671

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.

1 serious warning sign in Prokidney’s filings.

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 18 Mar 2026, plus the 10-Q filed 10 Aug 2026 and 3 later 8-Ks.

  • Doubt it can keep going

    Serious

    The company or its auditor warned it may not have enough money to last the next year.

    “These matters raise substantial doubt about the Company’s ability to continue as a going concern.”
    Show the full paragraph
    The accompanying condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities in the normal course of business. The Company performed an analysis of its ability to continue as a going concern. As of June 30, 2026 , the Company had an accumulated deficit of $ 1,318,294,000 . The Company has generated losses from operations for each year since its inception. The Company intends to continue to conduct significant additional research, development, and clinical study activities which, together with expenses incurred for general and administrative purposes, are expected to result in continuing operating losses for the foreseeable future. The amount of future losses and when, if ever, the Company will achieve profitability are uncertain. The Company’s ability to achieve profitability will depend, among other things, on successfully completing clinical studies, obtaining requisite regulatory approvals, establishing appropriate pricing for its product with payers, and raising sufficient funds to finance the Company’s activities. No assurance can be given that the Company’s clinical development efforts will be successful, that regulatory approvals will be obtained, or that the Company will be able to achieve appropriate pricing and market access or that profitability, if achieved, can be sustained. These matters raise substantial doubt about the Company’s ability to continue as a going concern. The Company believes that, based on its current business plan, its existing cash and cash equivalents and marketable securities of $ 181,564,000 at June 30, 2026, will not be sufficient to fund its obligations for the 12 months following the filing of this Quarterly Report on Form 10-Q on August 10, 2026. The consolidated financial statements do not include any adjustments related to the outcome of this uncertainty.

    From the 10-Q filed 10 August 2026, Part I, Item 1. Financial Statements. Read it in the filing

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.