Kevin Delaney, the editor in chief of Quartz and one of the digital publication’s co-founders, is stepping down as part of a shake-up of the company’s leadership.

Quartz announced the change on Monday, adding that another of its co-founders, Zach Seward, had become the chief executive officer. Mr. Delaney had previously shared that role with Jay Lauf, the publisher, who was named chairman of the company on Monday. Katie Weber, previously the chief commercial officer, was elevated to president in the series of moves.

The job of editor in chief was left open, with Quartz saying it was looking for a new one. Mr. Delaney will leave his role at the end of the month and remain an adviser to the company.

Yusuke Umeda, co-chief executive of Quartz’s parent company, Uzabase, said, “I am particularly excited for the next chapter and to work with Zach and Katie to aggressively build on this momentum, to the benefit of readers, partners and members.”