[3] The company began its operations as a small texturizing unit under the name Welspun Winilon Silk Mills in the Palghar district.

In 1990, the company expanded its operations by establishing a polyester filament flat yarn manufacturing unit in Thane, with a capacity of 605 MT per annum.

[9][10] Welspun also proposed a POY project in Silvassa, Dadra, and Nagar Haveli, with a capacity of 15,000 metric tonnes per annum (MTPA).

Welspun also acquired a plant from Rieter Automatic Gmbh in Germany to launch its polyester filament yarn project.

[18] In 2015 and 2016, Welspun was granted the contract for Package I development of Delhi–Meerut Expressway, covering 8.7 km in Delhi, with a total estimated project cost of ₹841.50 crore (US$110 million).

[27] In February 2023, the Welspun Group launched a textile facility in Telangana, inaugurated by IT and Industries Minister KT Rama Rao.

[28] Also, the Welspun Group announced a Rs 2,000 crore investment for the development of an integrated textile manufacturing zone in Kutch, Gujarat, in alignment with the Indian government's Sagar Mala project.

[29] In March 2023, the group expanded its presence in the building materials sector by acquiring Sintex BAPL, a water tank manufacturer, for Rs 1,251 crore through its subsidiary, Welspun Corporation.