• MISTRAS Group supplemented merger disclosures in response to two lawsuits challenging its proxy statement and seeking to block the transaction.
• The September 17, 2026, agreement calls for H.I.G. Capital-controlled Athena Purchaser to acquire the business for $20.35 per share in cash.
• The supplemental disclosures leave merger terms unchanged, with the stockholder meeting still scheduled for November 24, 2026.
• No competing acquisition proposals emerged during the go-shop period, which expired October 27, 2026, following outreach involving 122 third parties.
• No executive officers or directors had agreements with the buyer or its affiliates covering post-closing employment or equity participation as of November 13.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. MISTRAS Group Inc. published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001140361-26-043833), on November 13, 2026, and is solely responsible for the information contained therein.