Cue has appointed Credit Suisse and Morgan Stanley to raise $300-$400 million as part of its initial public offering (IPO) due early next year, the sources said. Cue is a digital agency that works with Chinese tech companies like ByteDance, Baidu and Tencent <0700.HK> to source advertising on their popular Chinese apps like WeChat, Douyin, Jinri Toutiao, and Kuaishou. The Shanghai-based company was formed in March last year when four digital firms consisting of WIN, AnG, Wina Tech and Qixin were merged into a partnership and the business was backed by KKR .