Darktrace shares plunge again as investor lock-up ends

Shares dive by 13% as analysts raise doubts over cybersecurity firm's valuation

Shares in the cybersecurity firm Darktrace have plummeted again after an analyst note raising doubts about its valuation and as the expiry looms of a lock-up on insiders selling their stakes.

The Cambridge-based firm, which had been a star performer since floating in April and joining the FTSE 100 last week, had a share price fall of more than 13% to 698p in early trading on Monday, valuing the company at 4.8bn.