UPDATE 3-Alphawave slumps 21% on debut as London IPO market stutters again
(Adds comment from Alphawave chairman, detail on recent IPOs) LONDON, May 13 (Reuters) - Canadian semiconductor technology company Alphawave’s shares plunged as much as 21% on their London market debut on Thursday, shrinking its value by more than 600 million pounds ($842 million) within hours. The slump comes amid a broader tech stock selloff and only weeks after food delivery firm Deliveroo fell as much as 30% on its debut, potentially hurting the London market’s ambitions to attract young fast-growing companies. Toronto-based Alphawave had already compromised on pricing its initial pub...