The move will reduce SoftBank's 32.2 percent holding in the Chinese company to about 28 percent with the sale, it said, adding that proceeds would be earmarked to pay down debts.
SoftBank said in a statement it has "approved of a series of capital raising transactions, which involve monetising a portion of the shares of Alibaba".
The Japanese mobile carrier, led by charismatic businessman Masayoshi Son, first made its investment in Alibaba in 2000.
Led by Son, SoftBank launched an acquisition streak that saw it pick up an assortment of firms, including its USD 16 billion purchase of US-based mobile giant Sprint.
But the buying spree has put pressure on SoftBank's finances, and the firm also announced earlier this year it would buy back more than 14 percent of its stock at a cost of about 500 billion yen.
"Under the leadership of Masayoshi Son, SoftBank has been a highly valued, long-time partner of Alibaba for more than 16 years, and we look forward to continuing our strong partnership together," Ma said in a separate statement.
"As SoftBank looks to strengthen its own balance sheet, Alibaba determined that it was the best use of our capital to re-invest in our own business through an efficient buyback of a large number of shares in our own company that is accretive to our stockholders."
SoftBank has seen its profits boosted thanks to Alibaba's record USD 25 billion market debut in 2014 in New York.
Today's announcement came after the Chinese online giant disclosed last week that US securities regulators were probing its accounting for possible violations of US securities laws.
SoftBank shares rose more than two percent shortly after the opening bell today.
Alibaba's US-listed shares declined 3.1 percent yesterday after the announcement of SoftBank's planned share sale.
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