Jay Huang, the global head of collateralized debt obligations trading at Citigroup Inc., has left the bank, according to people with knowledge of the matter.

Huang, who was leading Citigroup’s CDO and collateralized loan obligation trading business, departed this week, said the people, who asked not to be identified as the information isn’t public. Huang had been with the bank since at least 2000, Financial Industry Regulatory Authority records show.

Huang declined to comment, as did Scott Helfman, a spokesman at Citigroup.

In 2015, the bank’s securitization business was the top revenue generator along with JPMorgan Chase & Co. among the 12 largest investment banks, according to Coalition, a London-based business analytics firm. In 2014, Citigroup held the lead spot alone among the biggest 10 firms.

Huang was one of the early traders of distressed structured investment vehicles around the 2008 financial crisis. In the years since, activity in these securities has become less prevalent because those vehicles have been unwound.

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