You can invest in the private market by using pre-IPO investing platforms, alternative asset funds, specialized brokers, direct shares, and indirect investments.
The 5 best ways to invest in pre-IPO shares Buy shares on a secondary marketplace. New regulations have made it possible for accredited investors to buy employee stock options. Become an angel investor. Invest in pre-IPO & venture capital funds. Make indirect investments. Invest on the IPO date via your broker.
It's typically between around 10% and 25% but it can be as much as 40% or more. Angel investment is most suitable if your business has growth potential, and you're willing to give up part ownership in return for investment.
To be an angel, you need to qualify as an accredited investor, defined by the SEC as $1 million of net worth or annual income over $200,000. (I'm simplifying – the real definition is a bit more complex – but it gives you the idea.)