While Tinsukia's economy is heavily driven by wholesale trade and mid-sized enterprises, several major corporate entities maintain a strong footprint in the region.
* **Oil India Limited (OIL):** While headquartered in nearby Duliajan, OIL's extensive exploration and production operations heavily influence Tinsukia's economy and infrastructure. * **Coal India Limited:** Operates significant historic mining activities in the Margherita subdivision of the district. * **Hindustan Unilever Limited (HUL):** Operates a major, high-capacity personal care manufacturing unit in the nearby industrial area of Doomdooma. * **Tea Corporations:** Renowned companies like Apeejay Tea, McLeod Russel, and Amalgamated Plantations manage vast, globally recognized tea estates surrounding the city.