Cybersecurity firm started by ex-spies surges on London market debut

Darktrace, a cybersecurity company advised by former MI5 and CIA spymasters, leapt more than 40% on its market debut on Friday, delivering a boost to the London market after the spectacular flop of Deliveroo last month.

The company was priced at 250 pence in the initial public offering, giving it a valuation of just over half the original aim of $4 billion. But it rocketed to 352 pence when trading started, well above the 220-280 pence range set by its bankers when its roadshow began on Monday.

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