A Chinese investment firm bought a block of ByteDance Ltd. shares at a valuation of $480 billion, far above recent levels, a sign of strong investor interest in the parent company of video sensation TikTok. In bidding that took place Wednesday, venture firm Capital Today won out over several other interested parties to acquire equity from Bank of China Group Investment Ltd., an early institutional investor in ByteDance, according to people familiar with the matter, who asked not to be named disc...