LeonaBio, Inc.
LONA- Exchange
- Nasdaq
- Industry
- Biological Products, (No Diagnostic Substances)
- SEC CIK
- 0001620463
No open-market purchases or sales by LeonaBio, Inc. insiders were filed in the last 90 days; 44 institutions reported holding it in 13F filings for Q2 2026, worth $66.8M in total; no superinvestor holds it.
Holders of 5% or more of LONA
Holders whose latest Schedule 13D or 13G filing reports 5% or more of LeonaBio, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Perceptive Advisors LLC | 13D/A | 19.99%1.86M shares | −0.11 ppfrom 20.10% | Dec 22, 20253 filings | Jan 16, 2026 | SEC |
| Acorn Bioventures, L.P. | 13G/A | 6.20%596.1K shares | +1.00 ppfrom 5.20% | Dec 23, 20252 filings | Jan 8, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
12 Schedule 13D and 13G filings on LeonaBio, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Aug 31, 20264:31 PM ET | Sermonix Pharmaceuticals, Inc.and 1 other | 13D | 36.90%5.50M shares | New | Aug 24, 2026 | SEC |
| Aug 25, 20264:00 PM ET | Perceptive Advisors LLCand 3 others | 13D/A | 19.99%1.89M shares | 0.00 ppfrom 19.99% | Aug 22, 2026 | SEC |
| Aug 20, 202610:34 AM ET | Acorn Bioventures, L.P.and 4 others | 13G/A | 12.10%1.49M shares | +5.90 ppfrom 6.20% | Aug 18, 2026 | SEC |
| May 15, 20268:03 PM ET | ADAR1 Capital Management, LLCand 1 other | 13G | 7.70%727.5K shares | New | Mar 31, 2026 | SEC |
| May 7, 20264:19 PM ET | Perceptive Advisors LLCand 3 others | 13D/A | 19.99%1.88M shares | 0.00 ppfrom 19.99% | May 5, 2026 | SEC |
| Feb 6, 20264:29 PM ET | Baselake Partners, LPand 2 others | 13G/A | 1.90%75.8K shares | −3.10 ppfrom 5.00%Below 5% | Dec 31, 2025 | SEC |
| Jan 16, 20264:46 PM ET | Perceptive Advisors LLCand 3 others | 13D/A | 19.99%1.86M shares | −0.11 ppfrom 20.10% | Jan 16, 2026 | SEC |
| Jan 8, 20265:29 PM ET | Acorn Bioventures, L.P.and 4 others | 13G/A | 6.20%596.1K shares | +1.00 ppfrom 5.20% | Jan 6, 2026 | SEC |
| Dec 23, 20255:16 PM ET | Perceptive Advisors LLCand 3 others | 13D/A | 20.10%1.87M shares | +6.20 ppfrom 13.90% | Dec 23, 2025 | SEC |
| Dec 23, 20254:46 PM ET | Acorn Bioventures, L.P.and 4 others | 13G | 5.20%501.7K shares | New | Dec 22, 2025 | SEC |
| Dec 22, 20254:30 PM ET | Perceptive Advisors LLCand 2 others | 13D/A | 13.90%550.0K shares | – | Dec 18, 2025 | SEC |
| Dec 18, 20253:47 PM ET | BML Investment Partners, L.P.and 1 other | 13G/A | 0.00%0 shares | −7.80 ppfrom 7.80%Below 5% | Dec 18, 2025 | SEC |
| Nov 14, 20254:06 PM ET | Baselake Partners, LPand 2 others | 13G | 5.00%197.5K shares | New | Nov 7, 2025 | SEC |
| Oct 10, 20254:41 PM ET | Oliveira Steven Michaeland 3 others | 13G/A | 4.09%161.2K shares | −1.02 ppfrom 5.11%Below 5% | Oct 1, 2025 | SEC |
| Apr 16, 20254:22 PM ET | Oliveira Steven Michaeland 3 others | 13G | 5.11%1.99M shares | New | Apr 14, 2025 | SEC |
| Feb 14, 202510:21 AM ET | BML Investment Partners, L.P.and 1 other | 13G/A | 7.80%3.03M shares | +1.30 ppfrom 6.50% | Dec 31, 2024 | SEC |
| Feb 14, 20259:59 AM ET | BML Investment Partners, L.P.and 1 other | 13G/A | 6.50%2.48M shares | – | Dec 31, 2024 | SEC |
| Feb 16, 2021 | Kawas Leen | 13GOld format | – | New | – | SEC |
| Feb 16, 2021 | Viking Global Investors LPSuperinvestorViking Global Investors | 13G/AOld format | – | – | – | SEC |
| Feb 16, 2021 | Venrock Healthcare Capital Partners II, L.P. | 13G/AOld format | – | – | – | SEC |
| Feb 12, 2021 | RTW Investments, LP | 13G/AOld format | – | – | – | SEC |
| Feb 8, 2021 | Perceptive Advisors LLC | 13DOld format | – | New | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell LeonaBio, Inc. shares.
No Form 144 notices for LeonaBio, Inc. are on file.