Six weeks after joining Fried, Frank, Harris, Shriver & Jacobson, DAVID KATZ is going back home.

Katz, a former cohead of Sidley Austin’s securities and derivatives enforcement and regulatory practice, left the firm in early September for Fried Frank’s New York office. Two weeks later, Fried Frank saw its former firm leader and capital markets head decamp for Freshfields Bruckhaus Deringer with two other partners.