Rebellions cofounder and CEO Sunghyun Park.Jae-hyun Kim for Forbes AsiaRebellions, a South Korean semiconductor startup, raised $250 million at a valuation of$1.4 billion to help build its latest AI chip offering, called the Rebel-Quad.Arm, the chip designer backed by Japanese billionaire Masayoshi Son’s SoftBank, invested in Rebellions for the first time. It’s also Arm’s first investment in an Asian startup.Samsung Ventures, Pegatron VC, Korea Development Bank, Korelya Capital and Lion X Ventures, a South ...