This paper constructs the database of listed companies in web celebrity
economic sector, analyzes the wealth effect brought by web celebrity economy
to listed companies by using event analysis method, and discusses the market
reaction to the joint efforts of listed companies of different industries, different
property rights and different scales. The results show that the web celebrity
cooperative information disclosure event has a positive impact on the market
value of listed companies in the short term, and there may be a phenomenon
of concept speculation, investors and regulators should be wary of the behavior
of concept speculation to cash out. Market reactions for companies of different
industries and sizes are also different. The positive reactions of Internet,
business services and apparel are relatively significant, and the degree and speed
of market reaction of large companies is higher than that of small companies
before and after the event.