LeonaBio files Rule 144 notice for 22,254 shares

LeonaBio, Inc. (ATHA) filed a Rule 144 notice to sell 22,254 shares of common stock tied to an equity compensation event.

Rhea-AI Filing Summary

LeonaBio, Inc. (ATHA) filed a Rule 144 notice to sell 22,254 shares of common stock tied to an equity compensation event.

The filing also reports 2,586 shares sold in the past three months and lists a 03/04/2026 transaction date for the restricted stock lapse.

Insights

Securities Compliance Counsel

Notice reports a proposed sale under Rule 144 following a restricted stock lapse on 03/04/2026.

Rule 144 notices typically document the holder's intent to sell shares that became tradable after restrictions lapsed. The filing lists 22,254 shares as the amount to be sold and records prior sales of 2,586 shares.

Timing, method of sale, and whether volume limitations apply are not stated; subsequent Form 144 amendments or broker reports would show actual sale details and consummation.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does LeonaBio's Rule 144 filing for ATHA mean?

It notifies the SEC of an intended resale of 22,254 shares that became transferable after a restricted stock lapse on 03/04/2026. The notice documents intent; actual sale execution and proceeds are not reported in this filing.

How many shares did the filer sell recently for ATHA?

The filing records sales of 2,586 shares in the past three months, reported with a transaction date of 01/02/2026. Those past sales are listed separately from the 22,254 shares the filer intends to offer.

Who is listed as the seller in the LeonaBio Rule 144 filing?

The filing identifies an address for the reporting party tied to LeonaBio equity compensation and a broker (Morgan Stanley Smith Barney LLC). The filing links the transaction to an equity compensation restricted stock lapse on 03/03/2026.

Does the Rule 144 filing state how proceeds will be used for ATHA shares?

No cash‑use details are included. The notice records an intended resale of 22,254 shares following an equity compensation lapse; it does not disclose sale method, timing, or use of any proceeds.

AI-generated analysis. How Rhea-AI works. Not financial advice.

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 03/04/2026 - 07:47 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001604834
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	LEONABIO, INC.
SEC File Number	001-39503
Address of Issuer	18706 NORTH CREEK PARKWAY, SUITE 104 BOTHELL WASHINGTON 98011
Phone	(425) 620-8501
Name of Person for Whose Account the Securities are To Be Sold	Mark James Litton
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 38th Fl. New York NY 10004	5156	27661.94	9300434	03/04/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	03/03/2026	Restricted Stock Lapse - See Remarks	LeonaBio, Inc.			22254	03/04/2026	Equity Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Mark James Litton c/o LeonaBio, Inc. 18706 North Creek Parkway, Ste. 104 Bothell WA 98011	Common Stock	01/02/2026	2586	17791.68

144: Remarks and Signature

Remarks	Shares sold to cover tax obligation from settlement of vested Restricted Stock Units.
Date of Notice	03/04/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Mark Worthington, Attorney-in-Fact for Mark Litton
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)