Shanghai-Hong Kong Stock Connect is a cross-boundary investment channel under which investors in each market are able to trade shares on the other market using their local brokers and clearing houses. After the successful launching of the Shanghai-Hong Kong Stock Connect program in 2014, it is expected Shenzhen-Hong Kong Stock Connect program will be launched in 2016 according to Government Work Report 2015 and 2016. Does Shanghai-Hong Kong Stock Connect enhance stock market integration between Hong Kong and Mainland China? What predictions does it have on the launch of the Shenzhen-Hong Kong Stock Connect and How to promote stock market integration between Hong Kong and Mainland China? Differ from previous research, the stock market segmentation and integration is studied from a micro perspective focusing on the dynamics of the cross listed companies' A and H shares' prices. Under the assumption of efficient market, arbitrage will eliminate unreasonable gaps thus the stock prices (or return) of identical companies are apt to converge. If not, arbitrage opportunities arise and arbitrage capitalizes on unreasonable gaps while eliminate them and provide liquidity. The daily close prices of all together 84 cross listed companies from 2014 April, 10th to 2016 March, 25th are collected as our sample and the H shares' prices are adjusted to RMB prices by the exchange rate of identical day. The evolvement of price discrepancy between the cross listed A and H shares is first studied to analyze the impact of Shanghai-Hong Kong stock connect on market integration with application of transition model and log t test. And then arbitrage strategy between cross listed A and H shares is proposed to improve stock market integration by constructing arbitrage free interval with application of value at risk (VaR) model based on the assumption that gaps follow generalized Pareto distribution (GPD) and test its profitability.Empirical result shows that convergence between the cross listed A and H shares vary among individual companies and time, only 7 pairs of A and H shares of identical firm converge across the whole sample period, moreover there is no sign of uptrend as the number declines from 24 in 2014 to 8 in 2016 Q1. Therefore the integration level is unsatisfactory and Shanghai-Hong Kong Stock Connect has not fully functioned. However, arbitrage can contribute to market integration and the strategy produces significant average return of 3.64% for one week and 6.59% for two weeks. Out of sample test verifies the aforementioned findings and shows the strategy is effective and profitable. In this paper the evolvement of the Shanghai Hong Kong Stock Connect's policy effect is systematically studied. Besides, feasible strategy by arbitrage between cross listed stocks which facilitates market participants' spontaneous trading against unreasonable gaps as a solution of market segmentation is proposed. And our research provides enlightenment and empirical reference for Shenzhen-Hong Kong Stock Connect.
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