Chinese companies that made initial public offerings this year have seen their prices skyrocket an average of 181%, and are five times more expensive than the Shanghai Stock Composite Index, Bloomberg reported. The 92 companies that sold shares for the first time in 2014 trade at an average 48 times estimated price-to-earnings, compared with 8.4 times for the Shanghai Composite, and jumped an average of 44% on their first day of trading – the maximum percentage gain allowed. This has contributed to the benchmark Shanghai Composite jumping 29% since reaching a near 10-year low in July, and has raised concerns over volatility.