The defiant head of Arm China , the mainland joint venture of British semiconductor design company Arm, asserts that the Chinese firm may go public in either Shanghai or Hong Kong after 2025, weeks after the SoftBank Group Corp -owned UK tech outfit revealed its initial public offering (IPO) plan . Allen Wu, the chairman and chief executive of Arm China, told the South China Morning Post that the firm’s Chinese shareholders, who control 51 per cent of the Shanghai-based joint venture, have the discretion to pursue an independent IPO. “We are supportive of [British parent] Arm’s IPO,” Wu said…