The board decided to sell "4 per cent to Premji Invest & its affiliates and 2 per cent to Compassvale Investments Pte Ltd, an indirectly wholly-owned subsidiary of Singapore-based investment company Temasek," ICICI Bank said in a statement.
Premji Invest is the investment arm of Wipro Group chairman Azim Premji.
"The proposed transaction values the company at Rs 32,500 crore, reflecting substantial value created by the business since inception," it said.
The proposal to sell 6 per cent is subject to government and regulatory approval, it said.
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Upon completion of the transaction, ICICI Bank will hold approximately 68 per cent share of the company.
Prudential Plc, the foreign joint venture partner will maintain its current holding of approximately 26 per cent.
Besides, the board also approved appointment of Vishakha Mulye as a whole time director.
The appointment is subject to prior clearance of RBI, other regulatory and shareholder approvals and would be effective on the date of receipt of approval.
Last month, ICICI Bank decided to sell additional 9 per cent stake in its general insurance arm for about Rs 1,550 crore to Prem Watsa run Fairfax Financial Holdings of Canada.
Upon completion of the transaction, ICICI Bank will hold about 64 per cent in ICICI Lombard General Insurance Company Ltd, while Fairfax have 35 per cent.