---
schema_version: "secwatch.filing_event.v1"
accession: "0001436126-23-000045"
form_type: "8-K"
ticker: "MG"
cik: "0001436126"
company_name: "Mistras Group, Inc."
filed_at: "2023-10-13T23:59:59+00:00"
generated_at: "2026-06-09T23:57:27.167322+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Mistras Chairman Vahaviolos retires, becomes Strategic Advisor; interim CEO granted 250k options

## Summary
- Sotirios Vahaviolos retired as Executive Chairman, becomes Strategic Advisor to CEO; total comp unchanged at $300k ($100k salary + $200k director fees).
- Manuel Stamatakis appointed Chairman of the Board and Interim President/CEO; granted 250k stock options at $5.36 exercise price.
- Options granted as inducement for Stamatakis to accept interim CEO role; exercisable for 10 years or 1 year after termination.
- Grant date October 11, 2023; exercise price equals NYSE closing price that day.

## SEC filing metadata
- accession: 0001436126-23-000045
- form_type: 8-K
- ticker: MG
- cik: 0001436126
- company_name: Mistras Group, Inc.
- filed_at: 2023-10-13T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1436126/000143612623000045/0001436126-23-000045-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1436126/000143612623000045/mg-20231010.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001436126-23-000045
- JSON: https://secwatch.observer/filing/0001436126-23-000045.json
- Plain text: https://secwatch.observer/filing/0001436126-23-000045.txt

## Key facts
- Executive change
  Sotirios Vahaviolos retired as Executive Chairman at Mistras Group, Inc..
  - Action: retired
  - Role: Executive Chairman
  source text: Mistras Group, Inc. (the “Company”) announced on October 9, 2023, that its then Executive Chairman, Sotirios Vahaviolos, was retiring as Chairman.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1436126/000143612623000045/0001436126-23-000045-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.