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It added that Ampere is expected to collaborate with group companies, investees, and business partners.
SoftBank said the purchase will be financed through borrowings from Mizuho Bank and others.
The Raine Group is serving as financial adviser, with Morrison & Foerster providing legal counsel.
SoftBankpreviously acquired UK-based chip designer Graphcorefor between $400 million and $500 million.
