Mark James Litton - 03 Mar 2026 Form 4 Insider Report for LeonaBio, Inc. (LONA)

Reporting relationship: PRESIDENT and CEO, Director
Issuer ticker: LONA
Reported as of: 03 Mar 2026
Net transaction value: -$27,688
SEC form: 4
Accepted by SEC: 05 Mar 2026, 19:14:48 UTC
Prior SEC filing: 05 Jan 2026
Next SEC filing: 13 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Mark Worthington, Attorney-in-Fact on behalf of Mark James Litton

Key filing fact

Mark James Litton filed Form 4 for LeonaBio, Inc. (LONA) on 05 Mar 2026.

Key facts

This page summarizes Mark James Litton's Form 4 filing for LeonaBio, Inc. (LONA).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 05 Mar 2026, 19:14.

Change

Previous filing in this sequence was filed on 05 Jan 2026.
Current net transaction value: -$27,688.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001604834 Primary reporting owner

Litton Mark James

Relationship: PRESIDENT and CEO, Director
Address: C/O LEONABIO, INC., 18706 NORTH CREEK PARKWAY, SUITE 104, BOTHELL
Signature: /s/ Mark Worthington, Attorney-in-Fact on behalf of Mark James Litton
Signature date: 05 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

LONA transaction

Common Stock

Options Exercise

Transaction value
Shares: +22,254
Change %: +55%
Price: $0.000000^*
Shares after: 63,082
Date: 03 Mar 2026
Ownership: Direct

LONA transaction

Common Stock

Sale

Transaction value: $27,688
Shares: -5,156
Change %: -8.2%
Price: $5.37
Shares after: 57,926
Date: 04 Mar 2026
Ownership: Direct
Footnotes: F1, F2

LONA holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 656
Date: 03 Mar 2026
Ownership: By Irrevocable Trust of OSL
Footnotes: F3

LONA holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 656
Date: 03 Mar 2026
Ownership: By Irrevocable Trust of SWL
Footnotes: F4

LONA holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 656
Date: 03 Mar 2026
Ownership: By Irrevocable Trust of WGL
Footnotes: F5

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

LONA transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -22,254
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 03 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 22,254
Exercise price
Footnotes: F6, F7

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 7 footnotes

Footnote F1

Represents shares of common stock sold to cover tax withholding and remittance obligations in connection with the vesting of restricted stock units ("RSU") pursuant to mandatory "sell to cover" policies maintained by the Issuer and provisions contained in the reporting person's applicable RSU agreement, and does not represent a discretionary sale by the reporting person. No additional shares of common stock were sold by the reporting person.

Footnote F2

The "Amount" and "Price" reported in this Column 4 reflect the aggregate number and weighted-average price, respectively, of shares sold. These shares were sold in multiple transactions at prices ranging from $5.03 to $5.70, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.

Footnote F3

Reflects Common Stock held by Irrevocable Trust of OSL held for the benefit of Dr. Litton's children.

Footnote F4

Reflects Common Stock held by Irrevocable Trust of SWL held for the benefit of Dr. Litton's children.

Footnote F5

Reflects Common Stock held by Irrevocable Trust of WGL held for the benefit of Dr. Litton's children.

Footnote F6

Each RSU represents a contingent right to receive one (1) share of Issuer's common stock.

Footnote F7

On March 3, 2025, the reporting person was granted 22,254 RSUs (as adjusted for the 10-for-1 reverse stock split completed on September 17, 2025). 100% of the RSUs vested on the one (1) year anniversary of the grant date.