 HOUSTON--BUSINESS WIRE--Orion Group Holdings, Inc. NYSE: ORN the Company a leading specialty construction company, today announced Robert L. Tabb will step down as Executive Vice President and Chief Financial Officer effective October 29, 2021, to pursue a new opportunity with a private company that is not a competitor. Upon his departure, his duties will be performed by the senior management team in concert with finance department leadership while the Company conducts a formal CFO sear 