In 2002, Chau invested RMB ￥ 1 million into an interactive voice-recognition service provider, "Beijing Leitingwuji Network Technology Company Limited" (北京雷霆无极网络科技有限公司). In September 2003, before the company was even profitable, she sold it to TOM Group for the sum of US$132 million. Its subsidiary TOM Online was then separately listed on the Growth Enterprise Market of the Hong Kong Stock Exchange in early 2004. Chau remained a 9.998% shareholder in Tom Online until 12 March 2007, when Tom Group announced an offer for the outstanding shares in Tom Online, to take the company private. Chau also has a 24% stake in TOM Group prior to the announcement.