Rocket Internet SE, a Germany-based investment firm, plans to raise a new billion-dollar fund, a significant amount of which will eventually be invested in the U.S.

The Berlin-based firm will be the lead investor in the fund but is looking for other licensed partners to join.

The fund will be between about $1.5 billion and Rocket could close it as soon as December.

The funding will add to an existing $1 billion fund Rocket closed at the end of 2016.