Press Release




GenSight Biologics Postpones Release of 2025 Half-
Year Financial Results

Paris, France, August 28, 2025, 8:00 pm CEST – GenSight Biologics ("GenSight Biologics" or the
"Company") (Euronext: SIGHT, ISIN: FR0013183985, PEA-PME eligible), a biopharma company
focused on developing and commercializing innovative gene therapies for retinal neurodegenerative
diseases and central nervous system disorders, today announced that the release of its half-year financial
results, originally scheduled for September 19, 2025, has been postponed to September 29, 2025, after
the market closes.

The postponement allows the Company’s external auditors to complete all necessary audit procedures to
the highest professional standards. The Company confirms that the postponement relates only to the time
required for the audit rather than to any material issues with the financial statements. The extension
permits full compliance with regulatory requirements and maintains the Company’s commitment to
accurate and transparent financial reporting.

The Company’s Audit Committee and Board of Directors meetings have been rescheduled accordingly:

• Audit Committee: postponed to September 24, 2025
• Board Meeting: postponed to September 26, 2025

The half-year results will be made available in the investor relations section of the Company’s website
immediately following the September 29 announcement.


Contacts

GenSight Biologics
Chief Financial Officer
Jan Eryk Umiastowski
jeumiastowski@gensight-biologics.com



About GenSight Biologics S.A.
GenSight Biologics S.A. is a clinical-stage biopharma company focused on developing and
commercializing innovative gene therapies for retinal neurodegenerative diseases and central nervous
system disorders. GenSight Biologics’ pipeline leverages two core technology platforms, the
Mitochondrial Targeting Sequence (MTS) and optogenetics, to help preserve or restore vision in patients
suffering from blinding retinal diseases. GenSight Biologics’ lead product candidate, GS010 (lenadogene
nolparvovec)/GS010 is in Phase III in Leber Hereditary Optic Neuropathy (LHON), a rare mitochondrial
disease that leads to irreversible blindness in teens and young adults. Using its gene therapy-based
approach, GenSight Biologics’ product candidates are designed to be administered in a single treatment
to each eye by intravitreal injection to offer patients a sustainable functional visual recovery. The product
candidate GS010 is currently in clinical development, has not to date been granted marketing
authorization in France or any other jurisdiction, and is therefore not available commercially.