In a court battle between insurance brokers, an Illinois-based company has accused a competing firm of stealing away its employees and clients in retaliation for not accepting a business offer last year, according to a complaint filed in the Delaware Court of Chancery.

Arthur J. Gallagher & Co., a Delaware corporation based in Illinois, filed a cause of action Monday alleging insurance brokerage firm Alliant Insurance Services Inc. and its private equity owner, Stone Point Capital LLC, of raiding the Gallagher firm, stealing confidential information and rebranding Gallagher documents as its own after Gallagher refused to make a deal with Alliant.