The executive ranks at U.S regulators are facing some turnover, with the head of the U.S. Commodity Futures Trading Commission (CFTC) and the head of enforcement at the U.S. Securities and Exchange Commission (SEC) heading for the door.

In a statement, Heath Tarbert, chairman and CEO of the CFTC for just the past 17 months, announced that he will step down early next year.

Meanwhile, the SEC said that its head of enforcement, Stephanie Avakian, will leave the agency at the end of the year.

Avakian has been in sole command of the SEC’s enforcement division since August, after serving as co-director with Steven Peikin between June 2017 and mid-August.

The SEC said that deputy director of enforcement Marc Berger will serve as acting director.