The healthcare unit of Chinese ecommerce giant JD.com is looking to raise up to $3.5 billion in its Hong Kong IPO, according to Bloomberg. The offering would reportedly be the largest-ever IPO in Asia and value JD Health at between $25.3 billion and $28.5 billion. JD Health offers online prescription and telehealth services and is the largest health platform by revenue in China, according to its IPO filing.