Four consistent performers in the Indian stock market have been identified through a screener search, each having delivered over 25% annual return over the last four financial years. Among the firms is Mumbai-based water and environment management specialist Ion Exchange, whose shares have risen by 892% over the four years, while Gujarat Themis Biosyn has surged by 1,904%. Also featured are Timken India, which rose 386% in the four years, and JB Chemicals and Pharmaceuticals, whose shares have risen by over five times.