Mainstay Medical Announces the Appointment of Matthew Onaitis as Chief Financial Officer

Mainstay Medical International plc (“Mainstay” or the “Company”, Euronext Paris: MSTY.PA and Euronext Dublin: MSTY.IE), a medical device company focused on bringing to market ReActiv8®, an implantable restorative neurostimulation system to treat disabling Chronic Low Back Pain, announces the appointment of Matthew Onaitis as Chief Financial Officer, effective August 20, 2018.

Dublin – Ireland, 20 August 2018 – Mainstay Medical International plc (“Mainstay” or the “Company”, Euronext Paris: MSTY.PA and Euronext Dublin: MSTY.IE), a medical device company focused on bringing to market ReActiv8®, an implantable restorative neurostimulation system to treat disabling Chronic Low Back Pain, announces the appointment of Matthew Onaitis as Chief Financial Officer, effective August 20, 2018.

Mr. Onaitis has worked with dynamic healthcare businesses for 20 years, ranging from global multinationals including Biogen Idec and Elan Pharmaceuticals, to innovative specialty pharmaceutical companies such as Ignyta, Trius Therapeutics, and Somaxon Pharmaceuticals. He most recently served as Chief Financial Officer of Cidara Therapeutics (NASDAQ: CDTX), a biotechnology company developing novel anti-infectives including immunotherapies. During his tenure at Cidara, the company raised over $185 million and successfully progressed its lead program into late-stage clinical trials. Cidara is one of four publicly-traded healthcare companies at which Mr. Onaitis has been a senior executive. His experience includes building finance teams, leading numerous public and private financings, mergers and acquisitions and strategic collaborations, and the management of finance, accounting, business development, manufacturing, legal, and human resource functions.

Jason Hannon, CEO of Mainstay, said: “I am delighted Matt is joining Mainstay as we continue to build the business, expand our geographic reach and move towards the potential launch of ReActiv8 in the US. His breadth of experience, as well as his deep knowledge in financing innovative growth companies like ours, are the very skills Mainstay needs at this stage of its growth. Matt has also demonstrated an excellent cultural fit with Mainstay, which will be key as he builds relationships with our customers, employees and investors, who share a strong belief in our ability to create and rapidly grow the market for ReActiv8.”

Matt Onaitis said: “I am very excited by Mainstay’s ReActiv8 technology and its potential to address an underlying cause of chronic low back pain. I have been impressed by the Company’s progress and look forward to joining the team as we prepare for the completion of the US clinical study, expansion of the commercial business in Germany and additional markets, and the eventual launch in the US.”

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