144 0001409823 XXXXXXXX LIVE 0000866273 MATRIX SERVICE CO 001-15461 15 EAST 5TH STREET SUITE 1100 TULSA OK 74103 9188388822 Cavanah Kevin S Officer Common Robert W. Baird & Co. Incorporated

777 E Wisconsin Ave Milwaukee WI 53202

60000 763800.00 28133850 05/26/2026 Nasdaq Common 10/21/2013 Restricted Stock Issuer N 287 10/21/2013 Compensation Common 10/23/2013 Restricted Stock Issuer N 259 10/23/2013 Compensation Common 10/23/2014 Restricted Stock Issuer N 304 10/23/2014 Compensation Common 08/26/2015 Restricted Stock Issuer N 1053 08/26/2015 Compensation Common 08/25/2016 Restricted Stock Issuer N 956 08/25/2016 Compensation Common 08/23/2018 Restricted Stock Issuer N 1653 08/23/2018 Compensation Common 08/25/2018 Restricted Stock Issuer N 1236 08/25/2018 Compensation Common 08/26/2018 Restricted Stock Issuer N 869 08/26/2018 Compensation Common 08/29/2018 Restricted Stock Issuer N 2563 08/29/2018 Compensation Common 08/23/2019 Restricted Stock Issuer N 1653 08/23/2019 Compensation Common 08/25/2019 Restricted Stock Issuer N 1235 08/25/2019 Compensation Common 08/26/2019 Performance Shares Issuer N 5882 08/26/2019 Compensation Common 08/27/2019 Restricted Stock Issuer N 1470 08/27/2019 Compensation Common 08/27/2019 Restricted Stock Issuer N 1545 08/27/2019 Compensation Common 08/29/2019 Restricted Stock Issuer N 2563 08/29/2019 Compensation Common 08/27/2025 Restricted Stock Issuer N 2710 08/27/2025 Compensation Common 08/29/2025 Restricted Stock Issuer N 1187 08/29/2025 Compensation Common 08/29/2025 Restricted Stock Issuer N 2843 08/29/2025 Compensation Common 08/30/2025 Restricted Stock Issuer N 2502 08/30/2025 Compensation Common 08/30/2025 Performance Shares Issuer N 24248 08/30/2025 Compensation Common 08/30/2025 Restricted Stock Issuer N 2982 08/30/2025 Compensation Y 05/25/2026 02/23/2026 Kevin Cavanah