If you list 5% of a $1 trillion company on a stock exchange, the aggregate market capitalisation goes up by $1 trillion. (Float goes up by $50bn.)
Market capitalisation is price per share times shares outstanding . Float is price per share times publicly-trading shares .
When only a small fraction of shares are on the market, it's quite easy to manipulate the price higher... buying pressure goes a relatively long way.
If you can get 1% of your shares to be worth $100k, it now appears as though you are a $10 million company. This makes you appear reputable.
Drive hype about your "valuable" company, and once the stock is sufficiently pumped, dump your shares for profit.