Sermonix Pharmaceuticals, Inc. → LeonaBio, Inc. LONA

Stake: 36.90% Shares: 5,502,402 CUSIP: 04746L203 Class: Common Stock

Item 4 — Purpose of Transaction

The acquisition of securities of the issuer is part of a strategic collaboration as previously disclosed between Sermonix Pharmaceuticals, Inc. and the Issuer, as set forth in the previously disclosed License Agreement and Securities Purchase Agreement.

Cross-References

Insider Activity (last 365d)

0 transactions

0 buys · 0 sales · 0 awards/exercises

Issuer Cluster

3 13D/G filings on this issuer

2 other filings besides this one

Filer Track Record

1 filings by this filer

0 other filings in the data moat

Short Interest · settle 2026-08-14

DTC 3.50

38,973 shares short · -4.3% vs prior

Other 13D/G Filings on LeonaBio, Inc.

Filed	Form	Filer	Stake	Shares
2026-08-25	SCHEDULE 13D/A	PERCEPTIVE ADVISORS LLC	19.99%	1,889,403	view →
2022-07-01	SC	PERCEPTIVE ADVISORS LLC	—	—	view →

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