Press Release: Addex Appoints Bank of New York Mellon as Depositary Bank

Addex Therapeutics

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Ad Hoc Announcement Pursuant to Art. 53 LR

Geneva, Switzerland, September 23, 2025 - Addex Therapeutics https://www.globenewswire.com/Tracker?data=_0GVt2MOcTw3tNKdNNN0geCA-d0EU9r0yHt6fRDCl89O5w-7csQd139Mm1nkWoxyx-Xxr9E4IrTszatLEK0qCwReDYATF6r77z02jEp8-iS4G34MZnVCHbTrrsORQarP (SIX and Nasdaq: ADXN), a clinical-stage biopharmaceutical company focused on developing a portfolio of novel small molecule allosteric modulators for neurological disorders, today announced the appointment the Bank of New-York Mellon (BNY) as its new ADS depositary agent. This change is expected to become effective on October 6, 2025.

The appointment of BNY has no impact on the fees paid by ADS holders. At the effective date, no action will be required by the ADS holders.

About Addex Therapeutics

Addex Therapeutics https://www.globenewswire.com/Tracker?data=_0GVt2MOcTw3tNKdNNN0geCA-d0EU9r0yHt6fRDCl8_2mUO3p3HwoZuiW7n8y8Sb3SGLZUZ2QXIwN7_JyuPeI1HN86MidiIOvz4ECb1LQZs= is a clinical-stage biopharmaceutical company focused on developing a portfolio of novel small molecule allosteric modulators for neurological disorders. Addex's lead drug candidate, dipraglurant (mGlu5 negative allosteric modulator or NAM), is under evaluation for future development in brain injury recovery, including post-stroke and traumatic brain injury recovery. Addex's partner, Indivior, has selected a GABAB PAM drug candidate for development in substance use disorders and has successfully completed IND enabling studies. Addex is advancing an independent GABAB PAM program for chronic cough. Addex also holds a 20% equity interest in a private spin out company, Neurosterix LLC, which is advancing a portfolio of allosteric modulator programs, including M4 PAM for schizophrenia, mGlu7 NAM for mood disorders and mGlu2 NAM for mild neurocognitive disorders. Addex shares are listed on the SIX Swiss Exchange and American Depositary Shares representing its shares are listed on the NASDAQ Capital Market, and trade under the ticker symbol "ADXN" on each exchange. For more information, visit www.addextherapeutics.com

Contacts:

Tim Dyer Mike Sinclair

Chief Executive Officer Partner, Halsin Partners

Telephone: +41 22 884 15 55 +44 (0)7968 022075

PR@addextherapeutics.com msinclair@halsin.com

Addex Forward Looking Statements:

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended, including statements about the intended use of proceeds of the offering. The words "may," "will," "could," "would," "should," "expect," "plan," "anticipate," "intend," "believe," "estimate," "predict," "project," "potential," "continue," "target" and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Any forward-looking statements in this press release, are based on management's current expectations and beliefs and are subject to a number of risks, uncertainties and important factors that may cause actual events or results to differ materially from those expressed or implied by any forward-looking statements contained in this press release, including, without limitation, uncertainties related to market conditions. These and other risks and uncertainties are described in greater detail in the section entitled "Risk Factors" in Addex Therapeutics' Annual Report on Form 20-F, prospectus and other filings that Addex Therapeutics may make with the SEC in the future. Any forward-looking statements contained in this press release represent Addex Therapeutics' views only as of the date hereof and should not be relied upon as representing its views as of any subsequent date. Addex Therapeutics explicitly disclaims any obligation to update any forward-looking statements.

(END) Dow Jones Newswires

September 23, 2025 01:00 ET (05:00 GMT)