Founder of XTX Markets fails in challenge against HMRC treatment of deferred payment plan
Billionaire’s firm claims asset managers wrongly barred company after Ukraine invasion
Revenues from group’s three UK entities jumped 68% last year
One of the world’s biggest market makers alleges accounting firm is in breach of UK law
Earnings generate multimillion pound payout for Russia-born owner Alexander Gerko
Small investors encouraged by ‘perverse incentives’, claims founder of computer-driven trading firm