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SC 13D/A ·Filed Oct 28, 2026

LONA

LeonaBio, Inc.
NEUTRAL
Impact 5/10
Horizonweeks Processed1d 5h ago SEC0001655566-26-000004
Activist stake amendment (position change)
Actionable Insight • Neutral

The execution of the warrant exercise and distribution-in-kind significantly increases the public float and dilutes existing shareholders. Monitor for further distributions to Sermonix equity owners and any potential secondary sales by PXV II or other recipients, which could pressure the stock price.

DirectionNeutral
Confidencehigh
Horizonweeks
Latest settled: T+1d
LONA ▼ -1.01% at T+1d
NEUTRAL call -1.01% · α vs SPY -0.63% · entry $4.96 → $4.91
Next anchor: T+5d in 5d
Entry = T+0 close
Oct 28, 2026
via day close
T+1d
-1.01%
call -1.01% · α -0.63%
$4.91
settled 14h ago
T+5d
Pending
in 5d
T+20d
Pending
in 26d
T+60d
Pending
in 3mo

Price Chart

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Executive Summary

Sermonix Pharmaceuticals exercised a prefunded warrant for 3,149,470 shares of LeonaBio common stock on October 26, 2026, increasing its beneficial ownership to 25.1% of the outstanding shares. The remaining warrant rights for 2,352,932 shares were assigned to Perceptive Xontogeny Venture Fund II as a distribution-in-kind, and Sermonix also declared a distribution-in-kind of 4,725,754 shares to its equity owners, with 170,940 shares assigned to a creditor. This filing reflects the execution of previously disclosed transactions rather than new activist demands or escalation.

Key Financial Metrics

Stake
25.1%
Investor
Sermonix Pharmaceuticals, Inc.

Key Facts

  • Sermonix exercised a prefunded warrant for 3,149,470 shares of LeonaBio common stock on 10/26/2026.
  • Sermonix's beneficial ownership increased to 25.1% of LeonaBio's outstanding shares, based on 9,421,663 shares outstanding.
  • The remaining prefunded warrant rights for 2,352,932 shares were assigned to Perceptive Xontogeny Venture Fund II as a distribution-in-kind.
  • Sermonix declared a distribution-in-kind of 4,725,754 shares to its equity owners, including the 2,352,932 assigned to PXV II.
  • Sermonix assigned 170,940 shares to a creditor in satisfaction of amounts owed.
  • The transactions were previously disclosed in the original Schedule 13D and prior amendments, and this filing is a mechanical update reflecting their execution.

Financial Impact

Sermonix exercised warrants for 3,149,470 shares, representing approximately 33.4% of the then-outstanding shares (9,421,663). The total shares subject to distribution-in-kind (4,725,754) and creditor assignment (170,940) represent substantial dilution to existing shareholders.

dilutionownership structure

Risk Factors

  • Substantial dilution from the issuance of 3,149,470 shares upon warrant exercise and the planned distribution of 4,725,754 shares to Sermonix equity owners.
  • Potential overhang from the remaining 2,352,932 shares held by PXV II via the assigned prefunded warrant.
  • Creditor assignment of 170,940 shares may lead to immediate selling pressure.

Market Snapshot

Exchange
Nasdaq
Sector
Biological Products, (No Diagnostic Substances)
Analyst Consensus
90% bullish (10 analysts)

Investment Themes

Documents Analyzed

This report is based on 3 SEC documents filed with EDGAR.

DocumentAccession Number
SC 13D/A Filing (Primary)0001655566-26-000004
Document: 0001655566-26-000004-index.html0001655566-26-000004
Document: 0001655566-26-000004.txt0001655566-26-000004
8 reports for LONA
Performance horizon

Track record builds as more directional reports settle.

Filters
Rows
Reports for LONA, sortable and filterable
TypeNow
Oct 28, 2026
1d ago
SC 13D/A
NEUTRAL ★ 5/10
$4.96awaiting T+60awaiting T+60$4.91 (−1.01%)
Oct 26, 2026
3d ago
SC 13D/A
NEUTRAL ★ 3/10
$4.89awaiting T+60awaiting T+60$4.91 (+0.41%)
May 11, 2026
24w ago
DEFA14A
NEUTRAL ★ 2/10
$10.17 $7.81▼ −23.21%▼ −27.59%$4.91 (−51.72%)
May 7, 2026
25w ago
3
NEUTRAL ★ 2/10
$10.04 $7.66▼ −23.71%▼ −28.54%$4.91 (−51.10%)
Apr 23, 2026
27w ago
Press Release
BULLISH ★ 7/10
$8.33 $7.98▼ −4.20%▼ −9.28%$4.91 (−41.06%)
Mar 26, 2026
31w ago
Press Release
BULLISH ★ 8/10
$8.97 $8.41▼ −6.24%▼ −22.31%$4.91 (−45.26%)
Mar 4, 2026
34w ago
Insider Cluster
NEUTRAL ★ 3/10
$5.98 $9.64▲ +61.20%▲ +51.12%$4.91 (−17.89%)
Mar 4, 2026
34w ago
Insider Cluster
NEUTRAL ★ 3/10
$5.98 $9.64▲ +61.20%▲ +51.12%$4.91 (−17.89%)
Showing 8 of 8

US Market Status

Market Closed · Opens Mon (59h 54m)

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Report published Oct 28, 2026