Landgraab Industries is a large business corporation owned by the Landgraab family. If it is not the largest corporation in SimNation, it is likely one of the largest. The company creates and sells a large variety of products, including TVs, computers, and lights. Most of the company's products are quite expensive.
It is mentioned in some of the business chance cards. When a Sim first gets a job in the business career, they most likely work for Landgraab Industries. Said chance card also mentions that the Landgraab Industries wanted to buy Wrightway Toys, a toy making company. In The Sims 3, the science lab in Sunset Valley is the Landgraab Industries Science Facility. Landgraab Industries also owns Shiny Things Inc., the company that made the buyable Servo in The Sims: Livin' Large, also many kitchen appliances in the game are made by Shiny Things Inc. In The Sims 4 there are two schools named Landgraab Elementary, and Buckingham High, and are most likely owned by the corporation as the names are referring to the family and the surname of Malcolm Landgraab IV's grandparents.