Donald Trump owns around 250 affiliated and subsidiary companies under the Trump Organization, which serves as the holding company for most of his business ventures and investments

. More broadly, the Trump Organization is reported to comprise about 500 companies involved in various businesses such as hotels, resorts, residential properties, and merchandise

. Many of these companies may not have active operations, but the conglomerate spans a wide range of industries including real estate development, hospitality, golf courses, and more

. In summary, Trump owns approximately 250 active affiliated companies within the Trump Organization, which is part of a larger network of about 500 companies linked to his business empire.