The Securities and Exchange Board of India (Sebi) questioned the National Stock Exchange’s (NSE’s) former chief executive officer Chitra Ramkrishna and vice-chairman Ravi Narain in connection with the colocation (colo) controversy.
According to sources, both were summoned last week as part of a probe in the colo matter. The two were asked to clarify on certain issues and their statement was recorded in a detailed manner, said a source, adding the regulator wants to conclude the investigation by end of this month.
“Questioning took place at Sebi headquarters. It went on for a few hours,” said a person privy to the development.

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