In-N-Out Burger is a fast food restaurant chain that specializes in burgers, fries, and shakes. The company was founded in 1948 by Harry Snyder and is headquartered in Irvine, CA. In-N-Out Burger is known for its simple menu, fresh ingredients, and high-quality food. The company has a cult following and is often cited as one of the best fast food chains in the United States. In-N-Out Burger is a privately held company and does not disclose its financial information.