This year’s biggest IPO was also ranked among the biggest IPO flops of the year, with negative returns of 22.05 percent.ZTO Express, the second-largest Chinese express delivery company by volume, raised $1.4 billion in October by offering 72.1 million shares at $19.50 per share, above the pricing range of $16.50 to $18.50 per share. ZTO Express is listed on the NYSE under the symbol “ZTO”.