UPDATE: Sean Astin just signed with Brian Medavoy at his new company Jackson-Medavoy.

After a lull, clients are on the move again. Among the most recent defections: WME signed Pulitzer Prize-winning playwright Donald Margulies, whose latest, the Laura Linney-starrer Time Stands Still, is Tony-nominated for Best Play. Margulies, who won his Pulitzer for Dinner With Friends, was repped by CAA. A revival of his play Collected Stories is also running on Broadway.

Verve has signed Scott Kosar, whose genre script credits include The Crazies, The Machinist and The Texas Chainsaw Massacre. Kosar, who’d been with CAA, has Verve working on financing and cast for The Family, a film Kosar wrote and on which he will make his feature directorial debut. The film is a biopic on the Charles Manson and his clan. Kosar’s still managed by Shawn Simon.

CAA signed Justin Zackham, who wrote The Bucket List, has Nubs percolating at Warner Bros and created the F/X fall entry Lights Out. Zackham had been at WME.

CAA also signed Andrew Golder, the reality creator/showrunner whose Solitary is in its fourth season on Fox Reality. Golder had been at WME.

Fortitude and Roar signed Kip Pardue, best remembered from Remember the Titans. He had been at ICM and Untitled.