Exhibit 99 MATRIX SERVICE COMPANY REPORTS THIRD QUARTER FISCAL 2024 RESULTS TULSA, OK – May 8, 2024 – Matrix Service Company (Nasdaq: MTRX), a leading North American industrial engineering, construction, and maintenance contractor, today announced results for the third quarter fiscal 2024 ended March 31, 2024. THIRD QUARTER FISCAL 2024 RESULTS (all comparisons versus the prior year period unless otherwise noted) • Total backlog of $1.45 billion, +74% on a year-over-year basis, the highest level in 40-year c ...