(September 6, 2016, 10:07 AM EDT) -- LOS ANGELES — A shareholder filed a securities class action lawsuit against an infrastructure assets designer and certain of its current and former executive officers on Sept. 1 in California federal court, alleging that the defendants concealed issues with the company’s business, operational and compliance policies in violation of federal securities laws (William Graves v. AECOM, et al., No. 16-6605, C.D. Calif.)....