Prag Bosimi Synthetics Limited (PBSL) primarily manufactures polyester yarn, introduced in various types, through a technical collaboration with EMS Inventa, Switzerland.

Originally founded in 1987, PBSL began with the manufacture of polyester filament yarn and expanded into downstream textile processes.

The company's history includes significant restructuring efforts due to financial losses, necessitating rehabilitation proposals from financial institutions in the late 1990s.

PBSL launched new initiatives and divisions in the textile sector, including a subsidiary for a Textile Park Project and the Bosimi Apparel brand, expanding its market presence.

In recent years, PBSL invested in upgrading its machinery and started commercial sales of products in Assam and West Bengal markets.