Mistras Group, Inc.

Q: Jun 30 2026

Q: Mar 31 2026

FY: Dec 31 2025

Q: Sep 30 2025

Q: Jun 30 2025

Q: Mar 31 2025

FY: Dec 31 2024

Q: Sep 30 2024

Q: Jun 30 2024

Q: Mar 31 2024

FY: Dec 31 2023

Q: Sep 30 2023

Q: Jun 30 2023

Q: Mar 31 2023

FY: Dec 31 2022

FY: Dec 31 2022

Q: Sep 30 2022

Q: Jun 30 2022

Q: Mar 31 2022

FY: Dec 31 2021

Entry into a Material Definitive Agreement

Results of Operations and Financial Condition

Submission of Matters to a Vote of Security Holders

Results of Operations and Financial Condition

Results of Operations and Financial Condition

Results of Operations and Financial Condition

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Results of Operations and Financial Condition

Submission of Matters to a Vote of Security Holders

Results of Operations and Financial Condition

Results of Operations and Financial Condition

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Regulation FD Disclosure

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Termination of a Material Definitive Agreement

Results of Operations and Financial Condition

8.01,9.01

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Notice of Effectiveness

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement with Pricing Information

Notice of Effectiveness

Amended Initial Registration Statement

Registration of Securities on Exchange

Amended Initial Registration Statement

Amended Initial Registration Statement

Amended Initial Registration Statement

Free Writing Prospectus

Amended Initial Registration Statement

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

D'Alterio Gennaro A.

Foglia Stephanie Athena

Coggins Eileen Mary

Mill Road Capital III, L.P.

Foglia Stephanie Athena; 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos

Foglia Stephanie Athena

Vahaviolos Aspasia Felice

SHUMAN-FABBRI NATALIA

Vahaviolos Aspasia Felice

Vahaviolos Aspasia Felice

Foglia Stephanie Athena

Foglia Stephanie Athena; 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos

Vahaviolos Aspasia Felice

Foglia Stephanie Athena; 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos

Foglia Stephanie Athena

Foglia Stephanie Athena

PIZZI CHARLES P

GLANTON RICHARD H

Lohmeier Michelle

FORESE JAMES J

Specialized Disclosure Report

Annual Report Scanned (Paper)

Correspondence with the SEC

Letter from the SEC

Letter from the SEC

Annual Report Scanned (Paper) (amendment)

Correspondence with the SEC

Specialized Disclosure Report

Letter from the SEC

Annual Report Scanned (Paper)

Specialized Disclosure Report

Annual Report Scanned (Paper)

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Specialized Disclosure Report

Annual Report Scanned (Paper)

Specialized Disclosure Report

Specialized Disclosure Report (amendment)

Specialized Disclosure Report