You work at Bob’s Big Fat Fund, a large mutual fund with a hundred billion dollars in AUM, or Assets Under Management. You wanted a 2% position in your $6 billion dollar Grow My Short Hairs Long Fund. That 2% is $120 million. You want shares of DIS, currently trading at $120 a share, conveniently.
You don’t want to chase the stock and make it more expensive for you to buy, just on your own volume of purchases. So you tell your trade to buy up to but not over $120 a share. Day one: you scoop in 100,000 shares, or 10% of the million shares you’ll need to make your $120 million position in DIS. You have an open order to buy DIS at a $120 limit.
DoorDash not involved.