LeonaBio, Inc. (LONA)
Nasdaq: LONA · Biological Products, (No Diagnostic Substances) · Bothell, WA · filing with the SEC since 2014
Who owns LeonaBio, Inc.
As filed with the SECHolders of 5% or more
4
Sermonix Pharmaceuticals, Inc. holds 36.9% of Common Stock, as its SCHEDULE 13D filed Aug 31, 2026 says.
Directors and officers
18
report now, of 24 people on the record since 2020. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 4 named at left.
Holders of 5% or moreshare of the class, as filed
Sermonix Pharmaceuticals, Inc.
SCHEDULE 13D · filed Aug 31, 2026 · Common Stock
Perceptive Advisors LLC
SCHEDULE 13D/A · filed Oct 26, 2026 · Common Stock, $0.0001 par value · 20% in Aug 25, 2026
Anders Hove
SCHEDULE 13G/A · filed Aug 20, 2026 · Common Stock, $0.0001 Par Value · 6.2% in Jan 8, 2026
ADAR1 Capital Management, LLC
SCHEDULE 13G · filed May 15, 2026 · Common Stock, $0.0001 par value per share
Oliveira Steven Michael
SCHEDULE 13G/A · filed Oct 10, 2025 · Common Stock · reported falling below 5%, from 5.11% in Apr 16, 2025
Baselake Partners, LP
SCHEDULE 13G/A · filed Feb 6, 2026 · Common Stock, $0.0001 par value per share · reported falling below 5%, from 5% in Nov 14, 2025
BML Investment Partners, L.P.
SCHEDULE 13G/A · filed Dec 18, 2025 · Common Stock, $0.0001 par value · reported falling below 5%, from 7.8% in Feb 14, 2025
What LONA reports owning in othersstakes of 5% or more, and other ties
LeonaBio, Inc. reports no stake in another company in the record.
Insider tradesForm 4
10sales
0purchases
0sales on a scheduled plan
5people selling
$100,000sold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Oct 28, 2025 to Oct 28, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Oct 28, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window6 of 27 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Portman David J. | 10% owner | 0 | $0 | 0 | 1 | $9.92B |
| Litton Mark James | PRESIDENT and CEO | 2 | $0 | 0 | 0 | $0 |
| Renninger Robert | CHIEF FINANCIAL OFFICER | 2 | $0 | 0 | 0 | $0 |
| Church Kevin | CHIEF SCIENTIFIC OFFICER | 2 | $0 | 0 | 0 | $0 |
| San Martin Javier | CHIEF MEDICAL OFFICER | 2 | $0 | 0 | 0 | $0 |
| Worthington Mark | GENERAL COUNSEL and CCO | 2 | $0 | 0 | 0 | $0 |