The milestone was reached for the first time in intra-day trade on Friday last week, but the overall market cap, also known as total investors' wealth, had slipped marginally below this level at the end of trading session that day.
At the close of today's trading session, the total BSE market cap stood at Rs 99,63,758 crore, as against a peak of Rs 1,00,40,408 crore or Rs 100.4 trillion scaled just a few minutes earlier.
BSE is among the world's ten largest exchanges in terms of market value, while it is the largest globally for number of firms listed on its platform. It has over 4,000 actively traded companies and nearly 2.7 crore investors trade on it.
In US dollar terms, the BSE market cap now stands at over USD 1.6 trillion and it has added more than USD 500 billion (Rs 29 lakh crore) this year itself.
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The Sensex has gained by about one-third so far this year, while the 30 Sensex companies alone, which are among the biggest companies in the country, now account for nearly 50 per cent or about Rs 47 lakh crore of total investor wealth.
This includes TCS, the country's most valued firm and the only entity to have a market value of over Rs 5 lakh crore, followed by state-run ONGC and private sector behemoth Reliance Industries with market caps of over Rs 3 lakh crore each.