As the economic center of the nation, Tehran hosts the headquarters of Iran's largest state-owned enterprises and its most successful private companies and startups.
* **Energy:** The National Iranian Oil Company (NIOC), one of the largest oil companies in the world, is headquartered here. * **Automotive:** Iran Khodro (IKCO) and SAIPA, the two massive automakers dominating the domestic market, maintain their headquarters and primary manufacturing facilities in the greater Tehran region. * **Aviation:** Iran Air, Mahan Air, and Aseman Airlines are all based in Tehran. * **Tech & E-Commerce:** The province is the launchpad for Iran's thriving domestic tech sector, including **Digikala** (the largest e-commerce platform in the Middle East), **Snapp!** (the premier ride-hailing app), and **Cafe Bazaar** (the leading Android app marketplace in Iran).