(Updates share price, adds analyst comment) By Kiyoshi Takenaka and Ankur Banerjee TOKYO, April 13 (Reuters) - Japanese technology investor SoftBank Group Corp has moved to sell almost all of its remaining shares in Alibaba Group Holding Ltd, the Financial Times reported, sending the Chinese e-commerce giant's Hong Kong-listed shares lower. The sale would come as valuations of China's big tech firms have started recovering this year after an end to two years of heightened regulatory scrutiny, providing a window for long-time investors such as SoftBank to reduce exposure to an economy battered by strict pandemic policies and Sino-U.S. tension. SoftBank's share price closed down 1% on Thursday, versus a 0.3% rise in the broader market. Alibaba, one of the most valuable assets in SoftBank's portfolio, tumbled as much as 5.2% in Hong Kong and closed down about 2%.