The Sensex, India's benchmark stock index, marks its 40th anniversary, symbolizing the nation's economic transformation from a closed economy to a global player. Ashutosh Singh, CEO of BSE Index Services, notes that while passive investing is growing in India, it remains in its early stages compared to markets like the US. The Sensex's journey from 1986 to its current value of 85,000 reflects India's liberalization, reforms, and expansion, embodying national ambition and market maturity.