Bluejay Diagnostics

BJDX on Nasdaq. Market value $3m.

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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

None of the long-term investors we follow own it. 8 funds in all.

Dec '25
Jun '26
Largest holders overall

From 13F filings for the quarter ended 30 June 2026.

Big holders and activists

5 investors own more than 5%.

  • Armistice Capital, LLC
    Passive investor
    at least 10.0%+5.0 pts
    (filed with 1 related holder)
    Since 30 June 2026
  • Ayrton Capital LLC
    Passive investor
    at least 10.0%
    (filed with 2 related holders)
    Since 30 June 2026
  • Mitchell P. Kopin
    Passive investor
    at least 10.0%+5.0 pts
    (filed with 2 related holders)
    Since 3 June 2026
  • SABBY MANAGEMENT, LLC
    Passive investor
    at least 4.9%
    (filed with 2 related holders)
    Since 31 December 2024
  • at least 1.4%
    (filed with 5 related holders)
    Since 31 December 2024
  • L1 Capital Global Opportunities Master Fund, Ltd.
    Passive investor
    Sold down below 5%
    Since 31 December 2024
  • Braeden Lichti
    Activist
    Sold down below 5%
    Since 2 June 2026
    What they said

    Since the filing of the Reporting Persons' Schedule 13D with the SEC on March 11, 2026, the Reporting Persons have disposed of all shares of common stock of the Issuer. As of June 2, 2026, the Reporting Persons no longer beneficially own any shares of the Issuer's Common Stock.

    Read the filing
  • NorthStrive Fund II LP
    Activist
    Sold down below 5%
    Since 2 June 2026
    What they said

    Since the filing of the Reporting Persons' Schedule 13D with the SEC on March 11, 2026, the Reporting Persons have disposed of all shares of common stock of the Issuer. As of June 2, 2026, the Reporting Persons no longer beneficially own any shares of the Issuer's Common Stock.

    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, 5 insiders bought $125,000 of shares on the open market.

  • Wurth Douglas Clark
    Director
    Bought
    Date
    14 March 2026
    Shares
    12,500
    Price
    $2.00
    Value
    $25,000
  • Dey Indranil
    President and CEO, Director
    Bought
    Date
    14 March 2026
    Shares
    12,500
    Price
    $2.00
    Value
    $25,000
  • CHASE DONALD R
    Director
    Bought
    Date
    14 March 2026
    Shares
    12,500
    Price
    $2.00
    Value
    $25,000
  • ZEIDMAN FRED S
    Director
    Bought
    Date
    14 March 2026
    Shares
    12,500
    Price
    $2.00
    Value
    $25,000
  • Dey Svetlana
    Director
    Bought
    Date
    14 March 2026
    Shares
    12,500
    Price
    $2.00
    Value
    $25,000

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 Bluejay Diagnostics’ 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 6 Mar 2026, plus the 10-Q filed 12 Aug 2026 and 11 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 financial results and financial position, and the Company’s expected forward-looking outlook of significant negative cash flow in the future, raise substantial doubt with respect to its ability to continue as a going concern.”
    Show the full paragraph
    The Company had cash and cash equivalents of $ 9,598,916 and current liabilities of $ 2,116,641 as of June 30, 2026. The Company has incurred net losses and negative cash flows from operations since its inception and has an accumulated deficit of $ 45,760,521 as of June 30, 2026. The Company expects that its net cash used in operating activities will continue to be negative over at least the next several years as it attempts to produce product capable of meeting analytical validation and clinical validation and conducts clinical trial work and, if such production and trials are successful, prepares an FDA submission. These financial results and financial position, and the Company’s expected forward-looking outlook of significant negative cash flow in the future, raise substantial doubt with respect to its ability to continue as a going concern. The Company expects that it will be in position to submit a 510(k) regulatory application to the FDA for Symphony during the first half of 2027, assuming that it is able to generate sufficient clinical trial results to support such a submission. If the Company fails to obtain sufficient future financing, its clinical trials and targeted FDA submission timeline could be delayed, and it could be forced to abandon such activities entirely and cease operations, with the possible loss of such properties or assets. If the Company is unable to obtain additional financing as it continues to generate negative cash flow, its board of directors could determine to cause the Company to undertake a process of liquidation under Chapter 7 of applicable U.S. bankruptcy laws, or otherwise seek other protection under such laws. In such event, holders of shares of the Company’s common stock could recoup little, if any, value in such process. The Company currently estimates cash resources will be sufficient to fund its operations through the second quarter of 2027.

    From the 10-Q filed 12 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.