Apple Inc. headlines a growing list of investors in SoftBank Group Corp.’s $100 billion technology fund, which is expected to include Foxconn Technology Group Ltd. and the family office of Oracle Corp. Chairman Larry Ellison, the Japanese telecommunications giant said Wednesday.

Apple separately said it plans to invest $1 billion in the Japanese telecom giant’s fund. “We believe their new fund will speed the development of technologies which may be strategically important to Apple,” said Apple spokeswoman Kristin Huguet....