Mayne Pharma Group (ASX:MYX) is entitled to nearly AU$13.3 million in legal costs following court proceedings against Cosette Pharmaceuticals in the New South Wales Supreme Court last year, according to a Friday filing with the Australian bourse.

The company initiated proceedings against Cosette Pharmaceuticals in June 2025 in relation to Cosette's purported termination of the scheme implementation deed signed by the two parties in February 2025, the filing said.

The court ruled in favor of the company in October 2025 and made an adverse costs order against Cosette, per the filing.

Mayne Pharma Group shares rose 6% in midday trade on Friday.