** Shares of ticket-reselling platform StubHub Holdings STUB.N fall about 3.5% to $12.39
** Britain's competition regulator launches investigations into eight firms, including StubHub, over online pricing issues
** Competition and Markets Authority probes companies over suspected breaches of consumer law related to online pricing practices
** Britain will ban resale of tickets for music concerts, shows and sporting events at inflated prices, government says
** Up to last close, shares were down nearly 42% since debut in September
(Reporting by Chandni Shah in Bengaluru)
((chandni.shah@thomsonreuters.com))