Valuation above $11bn expected for firm whose fans include Prince Harry, Jennifer Aniston and Kim Kardashian

Fans of Oura are accustomed to using its trendy smart rings to fastidiously monitor their health but now investors are preparing to track a new metric: its share price.

The company’s filing to list imminently on the Nasdaq stock exchange in New York was made public on Thursday.

Latest purchases take value of deals to leave capital’s stock market this year past $100bn

Three more London-listed companies are set to be taken over as the value of deals removing firms from the capital’s under-pressure stock market passes $100bn (£74bn) so far this year.

On Tuesday, Bodycote, the FTSE 250 industrials group that has been listed on the London Stock Exchange since 1972, agreed a £1.84bn takeover by the US private equity group Veritas.