I agree that investing in the SP500 and Big Tech might be better for an individual investor without access to earlier rounds. For anyone reading your comment though, it's worth keeping in mind that the stock price is not just based on current and past performance, but also the expected future value of the unicorn (specifically: the present value of expected future dividends). A unicorn can grow exponentially and still show ordinary stock price appreciation, if that degree of exponential growth was already "baked into" the stock.