Genelux

GNLX on Nasdaq. Market value $118m.

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Should I look at this?

Look carefully before going further

Why it could be worth it

Nothing stands out yet.

Read the warning sign in its own filings

This is not advice.

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Who owns it

None of the long-term investors we follow own it. 72 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%.

  • Armistice Capital, LLC
    Passive investor
    at least 10.0%
    (filed with 1 related holder)
    Since 30 September 2025
  • Aladar Szalay
    Passive investor
    8.2%−0.2 pts
    Since 31 December 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. 6 sold $368,077, $108,800 of it under preset trading plans.

  • Cappello Joseph
    Chief Technical Officer
    Sold
    Date
    31 August 2026
    Shares
    10,257
    Price
    $2.74
    Value
    $28,112
  • Zindrick Thomas
    President and CEO
    Sold
    Date
    31 August 2026
    Shares
    34,463
    Price
    $2.67
    Value
    $91,899
  • Yu Yong
    Chief Scientific Officer
    Sold
    Date
    31 August 2026
    Shares
    9,683
    Price
    $2.75
    Value
    $26,658
  • Yu Yong
    Chief Scientific Officer
    Sold
    Date
    4 August 2026
    Shares
    653
    Price
    $2.94
    Value
    $1,922
  • Cappello Joseph
    Chief Technical Officer
    Sold
    Date
    4 August 2026
    Shares
    653
    Price
    $2.95
    Value
    $1,924
  • Zindrick Thomas
    President and CEO
    Sold
    Date
    4 August 2026
    Shares
    3,023
    Price
    $2.95
    Value
    $8,905
  • Smither John W
    Director
    Sold
    Date
    1 July 2026
    Shares
    12,000
    Price
    $2.91
    Value
    $34,898
  • Smalling Ralph
    Head of Regulatory
    Sold
    Date
    3 June 2026
    Shares
    192
    Price
    $2.93
    Value
    $563
  • Thomas John
    Director
    Sold
    under a preset trading plan
    Date
    1 June 2026
    Shares
    10,000
    Price
    $2.98
    Value
    $29,800
  • Cappello Joseph
    Chief Technical Officer
    Sold
    Date
    11 May 2026
    Shares
    605
    Price
    $2.97
    Value
    $1,797

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 Genelux’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 19 Mar 2026, plus the 10-Q filed 13 Aug 2026 and 1 later 8-K.

  • Doubt it can keep going

    Serious

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

    “These factors raise substantial doubt about the Company’s ability to continue as a going concern.”
    Show the full paragraph
    The accompanying condensed financial statements have been prepared on a going concern basis, which contemplates the realization of assets and the settlement of liabilities and commitments in the normal course of business. The Company has experienced recurring losses from operations since inception and incurred a net loss of $ 18.4 million and cash used in operations of $ 12.5 million during the six months ended June 30, 2026. These factors raise substantial doubt about the Company’s ability to continue as a going concern. In addition, the Company’s independent registered public accounting firm has included an explanatory paragraph in its report on the Company’s December 31, 2025 financial statements with respect to substantial doubt about the Company’s ability to continue as a going concern. The ability of the Company to continue as a going concern is dependent upon the Company’s ability to raise additional funds and implement its strategies. The financial statements do not include any adjustments that might be necessary if the Company is unable to continue as a going concern.

    From the 10-Q filed 13 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.