SoftBank's Vision Fund, under the leadership of Masayoshi Son, has significantly reduced its U.S. portfolio, selling off or writing down approximately $29 billion in assets since the end of 2021. This strategic pivot shifts the focus from traditional venture capital investments to a concentrated effort in artificial intelligence and chip technology. The change in strategy has also led to a reduction in the Vision Fund's staff, leaving the remaining employees primarily as caretakers of the existing investments.