A Los Angeles court granted a dismissal Thursday to Glaser, Weil, Fink, Jacobs, Howard & Shapiro.
The firm sued the rock star a year ago, claiming it was owed fees for work on three cases, including one in which a jury determined Stewart owed $2 million for canceling a December 2000 show in Las Vegas.
Its attorney, Vincent Green, says he could not comment on the dismissal or whether a settlement had been reached. Stewart had denied wrongdoing in court filings.
The case was slated to go to trial in January.
The firm's client roster has also included architect Frank Gehry and former game show host Bob Barker.