Oppenheimer & Close LLC boosted its position in Great Lakes Dredge & Dock Co. (NASDAQ:GLDD – Free Report) by 1.5% in the 3rd quarter, Holdings Channel reports. The fund owned 349,200 shares of the construction company’s stock after purchasing an additional 5,000 shares during the period. Great Lakes Dredge & Dock makes up about 2.8% […]