investing
There is no start up stock to invest in because so far there is no start up.
Usually entrepreneurs go to either an angle invstor(s) and get seed money of they go to venture capatalists (VCs, a.k.a. bloodsucking vampires) to get money. These early, wealthy, investors exact a hefty percentage of ownsership for their risk money. If the company's product works and the company then gets revenue, hopefully revenue exceeding expenditures for a couple quarters running, then they'll go public and issue stock. You need to be a VIP investor to get the initial shares in the 1st day.
These guidelines (like profitability) were ignored during the internet boom. We all saw the results.
So, if you have a few tens of million to invest, call Bussard.