Alibaba Group affiliate Ant Group is the world's most valuable billion-dollar startup at $150 billion valuation, according to Hurun Global Unicorn Index 2020 released on Tuesday. It's followed by TikTok-owner ByteDance at $80 billion valuation and transportation startup Didi Chuxing at $55 billion valuation. The top 10 unicorns make up 28% of the total value of the world's unicorns.