LeonaBio
LONA on Nasdaq. Market value $53m.
Should I look at this?
Look carefully before going further
Why it could be worth it
Nothing stands out yet.
What to watch out for
Read the warning sign in its own filings
This is not advice.
Who owns it
None of the long-term investors we follow own it. 44 funds in all.
Largest holders overall
From 13F filings for the quarter ended 30 June 2026.
Big holders and activists
6 investors own more than 5%.
- Sermonix Pharmaceuticals, Inc.Strategic holderat least 36.9%(filed with 1 related holder)Since 24 August 2026
What they said
The acquisition of securities of the issuer is part of a strategic collaboration as previously disclosed between Sermonix Pharmaceuticals, Inc. and the Issuer, as set forth in the previously disclosed License Agreement and Securities Purchase Agreement.
Read the filing - Perceptive Advisors LLCPassive investorat least 20.0%0.0 pts(filed with 3 related holders)Since 22 August 2026
What they said
Item 4 of the Schedule 13D is amended and supplemented as follows: On August 22, 2026, Sermonix notified the Reporting Persons that it will distribute Sermonix Pre-Funded Warrants exercisable for 2,352,932 shares of Common Stock to PXV II pursuant to a distribution of securities…
Read the filing - Anders HovePassive investorat least 12.1%+5.9 pts(filed with 4 related holders)Since 18 August 2026
- ADAR1 Capital Management, LLCPassive investorat least 7.7%(filed with 1 related holder)Since 31 March 2026
- Oliveira Steven MichaelPassive investorat least 4.1%−1.0 pts(filed with 3 related holders)Since 1 October 2025
- Baselake Partners, LPPassive investorat least 1.9%−3.1 pts(filed with 2 related holders)Since 31 December 2025
- BML Investment Partners, L.P.Passive investorSold down below 5%Since 18 December 2025
| Holder | Stake | Since | |
|---|---|---|---|
Sermonix Pharmaceuticals, Inc. Strategic holder | at least 36.9% (filed with 1 related holder) | 24 August 2026 | What they saidThe acquisition of securities of the issuer is part of a strategic collaboration as previously disclosed between Sermonix Pharmaceuticals, Inc. and the Issuer, as set forth in the previously disclosed License Agreement and Securities Purchase Agreement. Read the filing |
Perceptive Advisors LLC Passive investor | at least 20.0%0.0 pts (filed with 3 related holders) | 22 August 2026 | What they saidItem 4 of the Schedule 13D is amended and supplemented as follows: On August 22, 2026, Sermonix notified the Reporting Persons that it will distribute Sermonix Pre-Funded Warrants exercisable for 2,352,932 shares of Common Stock to PXV II pursuant to a distribution of securities… Read the filing |
Anders Hove Passive investor | at least 12.1%+5.9 pts (filed with 4 related holders) | 18 August 2026 | |
ADAR1 Capital Management, LLC Passive investor | at least 7.7% (filed with 1 related holder) | 31 March 2026 | |
Oliveira Steven Michael Passive investor | at least 4.1%−1.0 pts (filed with 3 related holders) | 1 October 2025 | |
Baselake Partners, LP Passive investor | at least 1.9%−3.1 pts (filed with 2 related holders) | 31 December 2025 | |
BML Investment Partners, L.P. Passive investor | Sold down below 5% | 18 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. 5 sold $99,418.
- Renninger RobertCHIEF FINANCIAL OFFICERSold
- Date
- 4 March 2026
- Shares
- 906
- Price
- $5.37
- Value
- $4,865
- Worthington MarkGENERAL COUNSEL and CCOSold
- Date
- 4 March 2026
- Shares
- 1,328
- Price
- $5.37
- Value
- $7,131
- CHURCH KEVINCHIEF SCIENTIFIC OFFICERSold
- Date
- 4 March 2026
- Shares
- 1,359
- Price
- $5.37
- Value
- $7,298
- San Martin JavierCHIEF MEDICAL OFFICERSold
- Date
- 4 March 2026
- Shares
- 1,720
- Price
- $5.37
- Value
- $9,236
- Litton Mark JamesPRESIDENT and CEO, DirectorSold
- Date
- 4 March 2026
- Shares
- 5,156
- Price
- $5.37
- Value
- $27,688
- Renninger RobertChief Financial OfficerSold
- Date
- 2 January 2026
- Shares
- 297
- Price
- $6.88
- Value
- $2,043
- Worthington MarkGeneral Counsel and CCOSold
- Date
- 2 January 2026
- Shares
- 876
- Price
- $6.88
- Value
- $6,027
- CHURCH KEVINCHIEF SCIENTIFIC OFFICERSold
- Date
- 2 January 2026
- Shares
- 876
- Price
- $6.88
- Value
- $6,027
- San Martin JavierCHIEF MEDICAL OFFICERSold
- Date
- 2 January 2026
- Shares
- 1,644
- Price
- $6.88
- Value
- $11,311
- Litton Mark JamesPresident and CEO, DirectorSold
- Date
- 2 January 2026
- Shares
- 2,586
- Price
- $6.88
- Value
- $17,792
| Date | Who | Did | Shares | Price | Value |
|---|---|---|---|---|---|
| 4 March 2026 | Renninger Robert CHIEF FINANCIAL OFFICER | Sold | 906 | $5.37 | $4,865 |
| 4 March 2026 | Worthington Mark GENERAL COUNSEL and CCO | Sold | 1,328 | $5.37 | $7,131 |
| 4 March 2026 | CHURCH KEVIN CHIEF SCIENTIFIC OFFICER | Sold | 1,359 | $5.37 | $7,298 |
| 4 March 2026 | San Martin Javier CHIEF MEDICAL OFFICER | Sold | 1,720 | $5.37 | $9,236 |
| 4 March 2026 | Litton Mark James PRESIDENT and CEO, Director | Sold | 5,156 | $5.37 | $27,688 |
| 2 January 2026 | Renninger Robert Chief Financial Officer | Sold | 297 | $6.88 | $2,043 |
| 2 January 2026 | Worthington Mark General Counsel and CCO | Sold | 876 | $6.88 | $6,027 |
| 2 January 2026 | CHURCH KEVIN CHIEF SCIENTIFIC OFFICER | Sold | 876 | $6.88 | $6,027 |
| 2 January 2026 | San Martin Javier CHIEF MEDICAL OFFICER | Sold | 1,644 | $6.88 | $11,311 |
| 2 January 2026 | Litton Mark James President and CEO, Director | Sold | 2,586 | $6.88 | $17,792 |
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 LeonaBio’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 31 Mar 2026, plus the 10-Q filed 14 Aug 2026 and 5 later 8-Ks.
Doubt it can keep going
SeriousThe company or its auditor warned it may not have enough money to last the next year.
“Based upon the Company’s current operating plan, it estimates that its $ 51.1 million of cash, cash equivalents and investments at June 30, 2026 may not be sufficient to fund its operating expenses and capital expenditure requirements through at least the next 12 months which raises substantial doubt as to our ability to continue as a going concern following the date of this Quarterly Report on Form 10-Q.”
Show the full paragraph
Based upon the Company’s current operating plan, it estimates that its $ 51.1 million of cash, cash equivalents and investments at June 30, 2026 may not be sufficient to fund its operating expenses and capital expenditure requirements through at least the next 12 months which raises substantial doubt as to our ability to continue as a going concern following the date of this Quarterly Report on Form 10-Q. Historically, the Company has incurred net losses from continuing operations and negative operating cash flows. The Company has not yet established an ongoing source of revenue sufficient to cover its operating costs; therefore, the Company expects it will need to continue to raise additional capital to accomplish its operating plan. In connection with the Private Placement, the Company issued 23,031,494 Series A Common Warrants that have an exercise price of $ 6.35 per share to be paid in cash (unless a resale registration statement is unavailable at the time of exercise, in which case the Series A Common Warrants will be exercisable on a cashless net exercise basis) and are exercisable at each holders option after the earlier of (1) the latest of (a) June 30, 2026, (b) the date on which the Company publicly announces the enrollment of the 500th subject or the last subject, whichever is earlier, in the ELAINE-3 trial; and (c) the date on which the FDA approves or issues a complete response letter to Eli Lilly & Co.'s marketing application, including a supplement to a new drug application, for imlunestrant in combination with abemaciclib in breast cancer, and (2) October 31, 2026 (the “Series A Common Warrant Initial Exercise Date”). The Series A Common Warrants will remain exercisable at each holders option until the 30th day following the Series A Common Warrant Initial Exercise Date (the “Series A Common Warrant Termination Date”), which Series A Common Warrant Termination Date will be no later than November 30, 2026. If exercised in full, the Series A Common Warrants would provide $ 146.2 million of additional capital to the Company.
From the 10-Q filed 14 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
Your first deep dive is free.
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.