RBL Bank, had filed draft papers with Sebi in June last year, seeking approval to float its IPO.
The IPO proposes fresh issue of equity shares worth Rs 1,100 crore and offer for sale of up to 17,568,408 scrips by existing shareholders including Beacon India Private Equity Fund and GPE (India) Ltd.
Without disclosing the nature of violation, Securities and Exchange Board of India (Sebi) said "past violation is being examined," as per the latest update as on January 22, 2016.
The markets regulator had last received a communication in this regard from the company on December 14.
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The proceeds of the IPO would be used to shore-up the equity capital base, to meet future capital requirements and to ensure compliance with Basel III and other Reserve Bank's guidelines.
According to RBL Bank, the listing of equity shares will enhance the visibility and brand name among existing and potential customers.
Kotak Mahindra Capital Company, Citigroup Global Markets India, Axis Capital, HDFC Bank, ICICI Securities, IDFC Securities, IIFL Holdings, Morgan Stanley India Company and SBI Capital Markets are the merchant bankers of the issue.