REPORT: The hyper-acquisitive Japanese telecom SoftBank is going to invest $3 billion WeWork

Japan's SoftBank Group Corp is close to finalizing an investment in U.S. office-sharing startup WeWork in a deal expected to be worth over $3 billion, CNBC reported on Sunday.

The investment under discussion is a $2 billion primary tranche of funding, followed by a secondary round worth more than $1 billion, CNBC reported, citing a source.

SoftBank may increase the size of the secondary investment to nearly $2 billion for a total investment of nearly $4 billion, CNBC added.

SoftBank could not immediately be reached for comment. WeWork declined to comment.

The Wall Street Journal in January reported that SoftBank was considering investing "more than $1 billion" in WeWork.

SoftBank earlier this month announced it was buying the asset-management firm Fortress for $3.3 billion. Three days later, reports emerged that the company was looking to merge Sprint, which it owns, with T-Mobile US.