Ian Rosenblatt’s High Court claim against Simon Cowell follows the end of a long professional relationship that included major transactions involving Syco Entertainment and Sony Music Entertainment.
Rosenblatt indicated in October 2022 that he intended to step down from his Syco directorships and his role as an adviser to Cowell. Companies House records show that he remained a director of Syco Entertainment and Syco Holdings until 7 August 2025. Proceedings were filed in the Commercial Court on 8 July 2026.
The claim alleges that Cowell breached an October 2022 agreement concerning transaction fees. Rosenblatt says Cowell agreed to pay him 15% of the proceeds of any qualifying transaction worth at least $100 million.
The amount claimed has not been disclosed, but the disputed fees could run into millions of pounds. The pleading also refers to an alleged “series of threats” intended to deter Rosenblatt from pursuing a debt or damages claim. The allegations have not been tested in court, and no substantive defence has yet been made public.
Rosenblatt is represented by Quinn Emanuel Urquhart & Sullivan partner Gregory Pantlin and senior associate Emma Bohnman-Bryant. Cowell has instructed Joseph Hage Aaronson & Bremen. Rosenblatt’s former firm represented Cowell in the 2020 acquisition of Sony Music Entertainment’s 75% stake in Syco Holdings.
Rosenblatt is also said to have served on Cowell’s internal team during a $125 million securitisation involving the intellectual property of the Got Talent franchise.
The proceedings come after the collapse of RBG Holdings, the listed legal services group developed from Rosenblatt Solicitors. RBG announced the termination of Rosenblatt’s consultancy agreement in January 2025 and made allegations that he rejected.
The company later corrected aspects of its announcement and entered into a new agreement with him before subsequently entering administration.
Commercial litigators will look closely at whether the October 2022 agreement alleged by Ian Rosenblatt was binding, which transactions it covered and whether the conditions for payment were met. Any dispute over the 15% fee is also likely to turn on how a qualifying transaction is defined.
Solicitors advising founders, directors and long-standing commercial advisers should make sure that success fees, exit terms and post-termination payments clearly identify the parties, the payment trigger and the transactions covered.
Rosenblatt’s role appears to have combined board membership, legal work, commercial advice and business introductions. That makes emails, transaction documents and other contemporaneous records particularly important if the case proceeds.
Cowell’s pleaded response should provide the first detailed account of his position and clarify whether the case turns on the existence of the agreement, its scope or Rosenblatt’s role in any qualifying transaction. The alleged threats could become a separate issue if they remain part of the claim.