SoftBank Group Corp. Chairman and CEO Masayoshi Son said Tuesday that selling its British chip design unit Arm Ltd. is an option to help improve its finances as the Japanese technology conglomerate reviews its strategy.

"We are exploring selling part of or all of Arm's value as an option," Son said during an online press briefing on his company's quarterly earnings.

SoftBank acquired the British chip firm in 2016 for $31 billion. Arm is currently 75-percent owned by SoftBank, with the remaining 25 percent held by its tech-focused Vision Fund.