-The creators of the exchange will buy shares on the market like everybody else.
Quoted for later.
I think what @GGGGG said might a little bit misleading.

sorry for that.
When the business plan releases, the IPO structure will be made clear.
100% public owned, doesn't have to mean 100% shares are available on IPO. The initial investor has to get some shares, and the rest shares will be sold through two stages, details of which will be release soon.