Shares of several major companies, including RailTel Corporation of India (NSE: RAILTEL), JSW Steel (NSE: JSWSTEEL), Vedanta (NSE: VEDL), TVS Motor Company (NSE: TVSMOTOR), and Muthoot Microfin (NSE: MUTHOOTMF), are expected to remain in focus on April 21, driven by corporate developments, sectoral cues and broader market sentiment.