Who owned most of the bonanza farms that developed in the late 1800s?

The bonanza farms that were developed in the late 1800s were mostly owned by companies having numeorus factories and controlled by professional managers deputed by the company. Bonanza farms in the United States were mostly growing wheats and then processing them. These kinds of farms were only possible because of several favourable factors like large amount of vacant lands, advanced machineries available and last but not the least was the huge growth in the eastern markets of the United States of America.