BSE-100 was launched in January 03, 1989 and was previously known as the BSE National index . The base year for this index is 1983-84 with base index value fixed at 100 points. BSE-100 was launched on full market capitalization method and shifted to Free-Float methodology effective from April 5, 2004. The index has 100 companies with varying weightages. BSE calculates a dollar-linked value of SENSEX called Dollex series of BSE indices.
Composition revised from 12/01/2009 and Free-Float Adjustment Factor revised from 25/05/2009