The company, which launched a beta version of its site in the UK in June, says its US version will have 5m tickets in its index when it goes live.
Online auction giant eBay has acquired StubHub, an internet tickets marketplace, which deals in tickets for sports and entertainment events. The deal is worth $310 million.
Launched in 2000 and based in San Francisco, StubHub's site managed $400m (£206m) in ticket sales site last year, earning a profit of around $10m (£5m). The secondary ticket market in the US is estimated to have a turnover of $10bn per year.