Kirkland & Ellis and O’Melveny & Myers have the lead roles on a $693 million deal that will see a Chinese state-owned investment company buy Montage Technology Group Ltd., a Nasdaq-listed maker of semiconductors used in cloud computing.

Shanghai Pudong Science and Technology Investment Co. Ltd., which is controlled by the Shanghai municipal government, will pay a 25 percent premium to acquire all outstanding shares of Montage, which is based in Shanghai. The deal is subject to shareholder and regulatory approval.