Kaspi.kz’s US shares gained 4.3% after the Kazakhstan mobile app company’s investors raised more than $1 billion in an upsized initial public offering, the world’s biggest listing since October.

The American depositary shares, which were trading below their IPO price until the final minute of their New York debut Friday, closed at $95.97, giving the company a market value of about $18 billion. After the close of regular trading, the shares fell back toward $92, their price in the IPO.