The shares, floated at 575p, nearly doubled on the first day and are now £28.68p (up 2 1/ 2p). First-quarter profits soared 91pc to £3.2m pre-tax, on sales 51pc ahead. Former parent, computer group Acorn, wants to join the party. Its market value is £220m, but its 24.4pc stake in ARM is worth £330m.
Acorn is looking at tax-efficient ways to unlock the value. The likeliest option is a demerger of the ARM stake.