Sharon Stone has left Creative Artists Agency after a year with the percentery. As of Friday, the actress had not signed with another agency.It’s not clear why Stone left CAA. Since signing with the agency last year, she has filmed Miramax Films’ “The Mighty” and Warner Bros.’ “Sphere,” the Michael Crichton-scripted pic in which she co-stars opposite Dustin Hoffman under Barry Levinson’s helm. She also closed deals to appear in Mandalay Entertainment’s “Gloria” and Working Title Films’ “The Enemy Within.” Last year the actress joined CAA — where she was repped by Richard Lovett and Kevin Huvane — after going two years without an agent. B.O. disappointments? Despite a string of box office disappointments, Stone still is one of the highest-paid actresses in town, receiving $7 million to $8 million per pic. During the time she operated without an agent, Stone — who was repped by her manager Chuck Binder and her attorneys — received $6 million to star in Warner Bros.’ remake of “Diabolique” and the same amount for Touchstone’s “Last Dance.” Both films fared poorly at the box office. Stone’s departure from ICM in 1994, after nearly three years with the agency, also came as a surprise. At the time she left, Stone was lensing Martin Scorsese’s “Casino,” for which she later received a best actress Oscar nomination.