London (CNN Business) 1. SoftBank goes bigger: SoftBank is raising $23.5 billion from the IPO of its Japanese mobile business, making it the second biggest stock market listing ever.

Strong demand from investors for a piece of one of Japan's biggest wireless carriers prompted the tech company to increase the number of shares available by 160 million.

It priced the shares at 1,500 yen ($13) each, raising a total of 2.65 trillion yen ($23.5 billion), according to a regulatory filing on Monday.

Listing the mobile business is a key part of CEO Masa Son's efforts to reposition SoftBank ( SFTBY ) as a global tech investor.

The transaction splits the company in two, allowing investors to choose between its mobile unit and its tech investment business. Shares in the mobile unit begin trading in Tokyo on December 19.