secwatch / observer
MG Mistras Group, Inc.
CIK 0001436126 44 ready 8-Ks latest August 10, 2026, 5:10 PM ET RSS · JSON
Activity: NORMAL 1 filings / 30d vs 0 baseline
Ready 8-Ks 44
Latest filing August 10, 2026, 5:10 PM ET
Top materiality 0.85
Event mix earnings ×23 · leadership ×11 · other_material ×6
Sentiment 19 pos · 3 neg · 22 neu
Latest earnings reported 2026-Q1
Executive change recent →

Recent 8-K filings for MG

Executive changes

Departed

John Smith

Executive Vice President, and President of Services
MG · Mistras Group, Inc.
Effective
2025-02-07
Filed
February 13, 2025, 6:59 PM ET
On February 7, 2025, Mistras Group, Inc. (the "Company") terminated the employment of its Executive Vice President, and President of Services, John Smith.
Departed

Dennis Bertolotti

President and Chief Executive Officer
MG · Mistras Group, Inc.
Effective
2023-10-09
Filed
December 8, 2023, 6:59 PM ET
Effective December 6, 2023, Mistras Group, Inc. (the “Company”) entered into a Separation Agreement and a General Release of Claims (collectively, the “Separation Agreement”) with Dennis Bertolotti, the former President and Chief Executive Officer of the Company, who was terminated from his positions on October 9, 2023.
Role change

Sotirios Vahaviolos

Executive Chairman
MG · Mistras Group, Inc.
Filed
October 13, 2023, 7:59 PM ET
Mistras Group, Inc. (the “Company”) announced on October 9, 2023, that its then Executive Chairman, Sotirios Vahaviolos, was retiring as Chairman.
Departed

Sotirios Vahaviolos

Executive Chairman
MG · Mistras Group, Inc.
Effective
2023-10-09
Successor
Manuel N. Stamatakis
Filed
October 10, 2023, 7:59 PM ET
On October 9, 2023, Sotirios Vahaviolos, Executive Chairman of the Board (the “Board”) of Mistras Group, Inc. (the “Company”), retired as Executive Chairman but will remain on the Board as Chairman Emeritus.
Role change

Manuel N. Stamatakis

Chairman of the Board
MG · Mistras Group, Inc.
Effective
2023-10-09
Filed
October 10, 2023, 7:59 PM ET
the Board elected Manuel N. Stamatakis (currently the Company’s Lead Director, Chairman of the Corporate Governance Committee and member of the Audit, Compensation, and Environmental, Social and Safety Committees) to serve as Chairman of the Board to succeed Dr. Vahaviolos.
Departed

Dennis Bertolotti

President and Chief Executive Officer
MG · Mistras Group, Inc.
Effective
2023-10-09
Successor
Manuel N. Stamatakis
Filed
October 10, 2023, 7:59 PM ET
On October 9, 2023, the Board also approved the termination without cause of Dennis Bertolotti as the Company’s President and Chief Executive Officer, effective immediately.
Role change

James J. Forese

Lead Director and Chairman of the Corporate Governance Committee
MG · Mistras Group, Inc.
Effective
2023-10-09
Filed
October 10, 2023, 7:59 PM ET
the Board appointed James J. Forese, currently a member of the Board and Chairman of the Audit Committee, as Lead Director and Chairman of the Corporate Governance Committee.
Role change (interim)

Manuel N. Stamatakis

Interim President and Chief Executive Officer
MG · Mistras Group, Inc.
Effective
2023-10-09
Filed
October 10, 2023, 7:59 PM ET
the Board appointed Mr. Stamatakis to serve as interim President and Chief Executive Officer until a permanent President and Chief Executive Officer has been appointed.
Departed

Jonathan Wolk

Senior Executive Vice President and Chief Operating Officer
MG · Mistras Group, Inc.
Effective
2023-02-08
Filed
February 9, 2023, 6:59 PM ET
On February 8, 2023, Mistras Group, Inc. (the "Company") notified its Senior Executive Vice President and Chief Operating Officer, Jonathan Wolk, that his active employment would cease immediately.

Earnings & guidance

2026-Q1 EPS reported $0.07 filing →

Materiality & sentiment trend

Max materiality 0.85 · Median 0.65 · Most common event earnings

19 positive 3 negative 22 neutral

source · MG on sec.gov