Arthur J. Gallagher & Co. has acquired Illinois-based R.J. Riordan & Co. Terms of the transaction were not disclosed.

R.J. Riordan is a retail property-casualty broker offering a range of insurance products and services to clients in the Chicago area. The firm specializes in the construction and transportation sectors.

The R.J. Riordan team will be relocating to Gallagher’s retail brokerage operations in Rolling Meadows, Ill., under the direction of J. Ryan Isaacs, head of Gallagher’s Midwest region retail P&C brokerage operations.

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“The R.J. Riordan team brings us additional expertise and growth opportunities, particularly in the construction industry,” said J. Patrick Gallagher, chairman, president and CEO of Gallagher. “We are very pleased to welcome them to Gallagher.”