If you are referring to the US Steel Corp then, The owner you are looking for is Andrew Carnegie. He is the head of this corp.
When someone owns a whole industry, like the steel company Andrew carnegie was the only one to be disributing steel.
Philadelphia, Pennsylvania
Andrew Carnegie controlled the steel industry during the Industrial Revolution.
The Carnegie Steel Company, founded by Andrew Carnegie.
Andrew Carnegie invested on steel
Andrew Carnegie invested on steel
US Steel
New York City Andrew Carnegie was founder of the Carnegie Steel Company which later became U.S. Steel.
J. Pierpont Morgan bought Carnegie's steel company in 1901.
Vertical integration occurs when a company owns several parts of the chain that ends in a finished product. For example, if the company produces the raw ingredients and also owns the means of turning those ingredients into finished products, this gives them an advantage compared to a company that has to find someone to use their raw product.
Andrew Carnegie