Courtroom Showdown Looms Over $672M Mayne Pharma Deal as Cosette Seeks Termination

2 min read | June 16, 2025 11:02 AM AEST | By Team Kalkine Media

Highlights 

  • Court hearing scheduled for 9 September over acquisition dispute 
  • Cosette alleges breaches and seeks breakup fee or damages 
  • Shareholder vote on takeover set for 18 June 

A high-stakes legal showdown is taking shape in the pharmaceutical sector as Mayne Pharma (ASX:MYX) and Cosette Pharmaceuticals prepare to face off in the NSW Supreme Court over the future of their proposed $672 million acquisition deal. 

The legal dispute centers around the scheme implementation deed (SID) that was originally agreed upon in February this year. Mayne Pharma initiated court proceedings to push the SID forward after Cosette, a U.S.-based company, indicated its intention to terminate the agreement. The court date has now been officially set for 9 September. 

Cosette has filed a cross-claim against Mayne, arguing that the SID may have already been terminated validly or could be considered void. The cross-claim also seeks compensation in the form of a breakup fee or, alternatively, unspecified damages. According to a statement released by Mayne, Cosette has further alleged that the company engaged in misleading or deceptive conduct, violating Australian Consumer Law. 

While the dispute escalates legally, Mayne has maintained its stance, noting that Cosette’s cross-claim largely reiterates issues previously raised in two termination notices. The first of those notices cited a material adverse change in Mayne’s circumstances. The second pointed to alleged breaches in the representations and warranties made under the SID. 

Despite the growing legal complexity, the acquisition is still technically in play. Mayne shareholders are scheduled to vote on the takeover proposal on 18 June. The outcome of that vote could significantly influence how the court ultimately rules in September. 

The courtroom proceedings and shareholder decision are now critical flashpoints that will determine whether the acquisition proceeds or collapses under legal scrutiny. For stakeholders and investors alike, the coming weeks may offer pivotal clarity on the long-term direction of Mayne Pharma and its relationship with Cosette. 

As the pharmaceutical landscape continues to evolve, this case underscores the legal and operational challenges that can arise even in meticulously structured corporate deals. The outcome could set important precedents for future transactions in the sector. 


Disclaimer

The content, including but not limited to any articles, news, quotes, information, data, text, reports, ratings, opinions, images, photos, graphics, graphs, charts, animations and video (Content) is a service of Kalkine Media Pty Ltd (Kalkine Media, we or us), ACN 629 651 672 and is available for personal and non-commercial use only. The principal purpose of the Content is to educate and inform. The Content does not contain or imply any recommendation or opinion intended to influence your financial decisions and must not be relied upon by you as such. Some of the Content on this website may be sponsored/non-sponsored, as applicable, but is NOT a solicitation or recommendation to buy, sell or hold the stocks of the company(s) or engage in any investment activity under discussion. Kalkine Media is neither licensed nor qualified to provide investment advice through this platform. Users should make their own enquiries about any investments and Kalkine Media strongly suggests the users to seek advice from a financial adviser, stockbroker or other professional (including taxation and legal advice), as necessary. Kalkine Media hereby disclaims any and all the liabilities to any user for any direct, indirect, implied, punitive, special, incidental or other consequential damages arising from any use of the Content on this website, which is provided without warranties. The views expressed in the Content by the guests, if any, are their own and do not necessarily represent the views or opinions of Kalkine Media. Some of the images/music that may be used on this website are copyright to their respective owner(s). Kalkine Media does not claim ownership of any of the pictures displayed/music used on this website unless stated otherwise. The images/music that may be used on this website are taken from various sources on the internet, including paid subscriptions or are believed to be in public domain. We have used reasonable efforts to accredit the source wherever it was indicated as or found to be necessary.


AU_advertise

Advertise your brand on Kalkine Media

Sponsored Articles


Investing Ideas

Previous Next
We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it.