 TULSA, Okla., Aug. 30, 2021 GLOBE NEWSWIRE -- Matrix Service Company Nasdaq: MTRX will announce results for its Fiscal Year 2021 fourth quarter and year ended June 30, 2021 after the market closes on Monday, September 13, 2021. The release will be followed by a conference call on Tuesday, September 14, 2021 at 10:30 a.m. Eastern time 09:30 a.m. Central time. 