Senior S.E.C. Officials Depart

The Securities and Exchange Commission has a new look to it.

First, Mary Jo White joined the agency as its chairwoman last month. Then, she went about filling key roles, naming co-leaders of the agency’s enforcement unit last week and hiring a general counsel, Anne Small, who rejoined the S.E.C. from the White House.

On Thursday, she had some fresh spots to fill.

The S.E.C. announced that Carlo V. di Florio, head of the agency’s Office of Compliance Inspections and Examinations, will depart the agency and be replaced by his deputy. Mr. di Florio is heading to Wall Street’s self-regulatory group, the Financial Industry Regulatory Authority, where he will become an executive vice president for risk and strategy.

David P. Bergers, the interim No. 2 enforcement official at the S.E.C., will also leave soon. Mr. Bergers, a 13-year employee of the agency, ran the S.E.C.’s Boston office in addition to his role in enforcement.

The continued departures are common amid a transition period. And others are expected to follow as Ms. White shuffles the staff and sets her own roster.

But the turnover could pose a challenge to the S.E.C. as it sheds top officials with a rich vein of knowledge about the markets and the agency itself.

Ms. White on Thursday described Mr. Bergers as “a tremendous asset to the agency.” In a statement about Mr. di Florio, who overhauled the agency’s exam program in the aftermath of the financial crisis, she said that he “has been an outstanding leader of the National Exam Program and has made a lasting impact on the S.E.C.”

Ms. White appointed Andrew J. Bowden, Mr. di Florio’s deputy, to succeed him. “His dedication, judgment, and leadership will serve him well as he takes on his new post leading an aggressive, effective examination program,” Ms. White said.

The changes come at an already difficult time for the agency, which has fallen far behind its rule-making responsibilities. Nearly three years after Congress passed the Dodd-Frank Act, the overhaul of Wall Street regulation, the S.E.C. has not carried out many of the changes.

The enforcement unit faces its own challenges. The unit, which also received a makeover after the crisis, is on pace to file the lowest number of enforcement cases in a decade, according to S.E.C. figures provided to The New York Times. Some longtime enforcement officials attribute the decline to low morale at the Washington office.

Mr. Bergers took on the deputy enforcement role early this year, but it was on an interim basis. When Ms. White announced last week that Andrew J. Ceresney and George Canellos would share the top role, it signaled that a broader shake-up could be at hand.

For Mr. Bergers, it appeared the time was right to move on. “I have been incredibly fortunate to serve alongside the agency’s talented and dedicated staff working hard every day to protect investors,” he said on Thursday.