Arthur J. Gallagher & Co. has reported net earnings of $40.5m, or $0.35 diluted earnings per share, for the fourth quarter of 2011, compared to $54.7m, or $0.51 diluted earnings per share, for the same period in 2010.

Revenues for the fourth quarter of 2011 increased to $578.4m, compared to $459.1m for the same period in the prior year.

Earnings from continuing operations were $40.5m, compared to $46m for the same period a year ago.

Arthur J. Gallagher chairman, president and CEO Patrick Gallagher said that during the fourth quarter, both operating segments posted improved adjusted EBITDAC margins and improved adjusted diluted net earnings per share.

"Our combined Brokerage and Risk Management segments posted 20% growth in adjusted total revenues, 7.2% organic growth in commission, fee and supplemental commission revenues, 26% growth in adjusted EBITDAC and 19% growth in adjusted diluted net earnings per share," added Gallagher.