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LONA SCHEDULE 13D/A: Activist campaign

An amendment to a Schedule 13D was

Filed with the SEC on · accession 0001193125-26-365096

LONA filed a SCHEDULE 13D/A (schedule 13d/a) with the SEC on Aug 25, 2026. An amendment to a Schedule 13D was filed regarding LeonaBio, Inc. (LONA), indicating a change in a previously reported beneficial ownership position. The stock moved +3.6% by the first close after the filing.

Summary of the filing

An amendment to a Schedule 13D was filed regarding LeonaBio, Inc. (LONA), indicating a change in a previously reported beneficial ownership position. The filing text does not disclose specific ownership percentages or stated intentions.

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Key details

Subject companyLeonaBio, Inc.

How LONA stock reacted

Close before

$7.73

Aug 24, 2026

First close after

+3.62%

$8.01

5 trading days

+2.46%

$7.92

Since filing

-42.88%

$4.42

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Frequently asked questions

What did LONA file with the SEC on Aug 25, 2026?

LONA filed a SCHEDULE 13D/A (Activist campaign). An amendment to a Schedule 13D was filed regarding LeonaBio, Inc. (LONA), indicating a change in a previously reported beneficial ownership position. The filing text does not disclose specific ownership percentages or stated intentions.

What does a activist campaign mean for LONA stock?

A settlement removes uncertainty; the stock often reacts to whether the amount is bigger or smaller than investors expected.

How do I read a SCHEDULE 13D/A?

A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13D/A (schedule 13d/a): A report the company filed with the SEC (the US market regulator).

How did LONA stock react to this filing?

LONA closed at $7.73 before the filing and $8.01 on Aug 25, 2026 (+3.62%). Five trading days later: $7.92 (+2.46%).

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