It also isn't an open market. Did I read that right that people owning shares in a private company need to put them up for sale? So the supply of shares is limi

It also isn't an open market. Did I read that right that people owning shares in a private company need to put them up for sale? So the supply of shares is limited vs a public company. First off, many shares aren't going to be transferable due to vesting schedules, agreements, or other logistical details. Even if they are transferable, many holders probably don't know that there is even a market on which to sell them. I've got to believe that the fraction of shares truly available make for a very short supply compared to any public company.