HP was seeking to recoup its losses from Lynch, who died last year when his luxury yacht sank off Sicily – and Autonomy’s former CFO, Sushovan Hussain.

The US technology giant sued Lynch and Hussain, accusing them of masterminding an elaborate fraud to inflate the value of Autonomy, which HP bought for US$11.1 billion in 2011 before the deal spectacularly unravelled.

HP wrote down Autonomy’s value by US$8.8 billion within a year and brought a US$5 billion lawsuit against Lynch and Hussain in London, with a judge ruling in HP’s favour in 2022.

Lynch, once hailed as Britain’s answer to Bill Gates, had always maintained his innocence and blamed HP for failing to integrate Autonomy into the company.

He was acquitted of criminal charges over the deal in the US and had intended to appeal the High Court’s 2022 ruling, a process which was on hold pending today’s decision on damages.

Judge Robert Hildyard ruled HP sustained losses of over £646 million (US$871.8 million) in relation to the difference between what HP paid for Autonomy and what HP would have paid “had Autonomy’s true financial position been correctly presented”.

Hilyard also said HP was entitled to another £51.7 million in relation to “personal claims for deceit and/or misrepresentation against Dr Lynch and Mr Hussain”, plus another US$47.5 million in relation to losses suffered by group companies.

HP said at a hearing last year that it was seeking up to US$4 billion. Hussain settled with HP earlier this year.