We investigate banks' issuance choices of wealth management products (WMPs), which are both interest rate deregulation vehicles and shadow deposits without explicit government insurance. Support for an inverted-U shape between market share and WMP issuance is found in national market. State-owned banks are reluctant to issue WMPs due to their monopoly power, very small banks do not have the capacity to issue while small and medium banks issue WMPs intensively as a regulatory arbitrage. Moreover, the geographic deregulation in 2009 stimulates the bank competition in the local market, incumbent banks take advantage of WMPs to fight off the new entering banks.