Among bluechip Tata Group stocks, Tata Motors slumped 7.99 per cent, Tata Steel plunged 6.37 per cent and TCS slipped 2.78 per cent on BSE.
Tata Motors and Tata Steel were the worst performers among the 30-Sensex stocks. Intra-day, they had fallen as much as 13 per cent and 11 per cent respectively.
Among others, shares of Tata Sponge declined by 4.61 per cent, Tata Elxsi dropped 3.62 per cent, Voltas (3.48 per cent), Tata Global Beverages (1.86 per cent), Tata Chemicals (1.67 per cent) and Tata Communications (1.40 per cent).
In a bloody carnage on Dalal Street, market benchmark Sensex plunged by 604.51 points today to 26,397.71, its biggest single-day fall in nearly four months, as a shock victory for 'Leave' camp in the UK referendum sent markets across the world into a tailspin.
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There are fears that the UK operations of several Indian companies might take a hit due to immigration and other restrictions that might come in following Brexit.
"A number of Indian corporates having exposure to Europe/UK either through trade or in case their production units are located there would be adversely impacted," India Ratings & Research, Principal Economist Sunil Kumar Sinha said.
The London Court of International Arbitration ruled in favour of DoCoMo over price it was entitled for exiting the Indian joint venture, the Japanese firm said in a statement.