If someone has a large amount of shares to sell they will have a market maker sit on the ask for them. That does not mean it is a conversion or insider. The market maker will sell during the day. After the close, they will figure out how much was sold, bunch it up into one trade and print it usually after the close and at a small discount which is what they earn for making the trades. Nothing evil, backstabbing or wrong with it. Assuming shares are being "printed" is just ignorant.