https://www.reuters.com/article/us-deliveroo-ipo-stocks/deliveroo-shares-plunge-30-in-london-debut-idUSKBN2BN0SB >LONDON (Reuters) -Shares in Deliveroo opened well below the price of their initial public offering on Wednesday, falling as much as 30% to in one of the steepest trading debut falls for a major company on the London market for years.