In a significant development in the ongoing legal clash between JP Morgan and Greek fintech firm Viva Wallet, London’s High Court has ordered the U.S. banking giant to cease its legal proceedings against Viva directors in Greece. The decision is the latest twist in a complex and increasingly contentious battle over control and investment interests in the fast-growing fintech company.

The case stems from a lawsuit JP Morgan filed in Athens in January, seeking €916 million (roughly $1.1 billion) from Viva CEO Haris Karonis and three other directors. The claim centers on a dispute tied to JP Morgan’s 48.5% investment in Viva Wallet, a payment platform serving businesses across southern Europe. The majority stake in Viva is held by Karonis’ investment firm, Werealize, which owns 51.49%.

In response to the Greek lawsuit, the Viva directors and Werealize sought an anti-suit injunction in the UK, arguing that legal action in Greece violated the terms of the shareholders’ agreement between the two parties. On Friday, Judge David Foxton ruled in their favor, concluding that JP Morgan’s move breached the contractual terms, and issued an injunction to halt the Greek proceedings.

Both sides, however, claimed partial victory. Werealize hailed the ruling as a step toward allowing Viva Wallet to move forward without further disruption. A company spokesperson urged JP Morgan to focus on constructive dialogue, stating, “JPM must now step aside and allow Viva to continue growing and reach its full commercial potential.”

JP Morgan, while acknowledging the court’s decision, emphasized that many of Werealize’s arguments were dismissed, including claims that the Greek case was frivolous or abusive. “We remain committed to our investment and the business,” a spokesperson said, signaling the bank’s intention to continue pursuing other legal avenues.

The feud has been marked by ongoing litigation across jurisdictions, including defamation claims filed by both parties in Greece. Earlier this year, the UK Court of Appeal ruled that JP Morgan had only a single opportunity to exercise its option to purchase Werealize’s remaining shares—a move that remains a point of contention, as the validity of that attempt is still under dispute.

Judge Foxton described the corporate relationship between JP Morgan and Werealize as “acrimonious, albeit a fruitful one for the legal community,” underscoring the intensity and complexity of the transnational corporate dispute.

As the legal saga continues, the future governance of Viva Wallet—and the fate of its influential investors—remains uncertain.