SEPTInvestingStart Free

MG 8-K: Acquisition

Mistras Group

Filed with the SEC on · accession 0001140361-26-043833

MG filed a 8-K (current report) with the SEC on Nov 13, 2026. Mistras Group filed a supplement to its definitive proxy statement regarding its pending merger with Athena Purchaser, LLC (controlled by H.I.G. The stock moved +0.0% by the first close after the filing.

Summary of the filing

Mistras Group filed a supplement to its definitive proxy statement regarding its pending merger with Athena Purchaser, LLC (controlled by H.I.G. Capital), in response to stockholder lawsuits and demand letters alleging the proxy contained false and misleading disclosures. The company denies the allegations but voluntarily supplemented the proxy to moot the claims, and the merger terms and special meeting date remain unchanged.

For details, click here →How to read a 8-K →

Key details

Target companyMistras Group, Inc.
Acquirer (parent)Athena Purchaser, LLC
Merger subsidiary of parentAthena Merger Sub, Inc.
Controller of parent and acquisition subH.I.G. Capital, LLC
Financial advisor to mistrasRobert W. Baird & Co. Incorporated

How MG stock reacted

Close before

$20.19

Nov 12, 2026

First close after

+0.05%

$20.20

5 trading days

—

Since filing

—

✦ Ask GOAX AI about this filing — what it means for MG, what changed since its last filings and what to watch next.

Try it free for 7 days

🔔 Want to stay updated on new SEC filings for MG?

Click here

Frequently asked questions

What did MG file with the SEC on Nov 13, 2026?

MG filed a 8-K (Acquisition). Mistras Group filed a supplement to its definitive proxy statement regarding its pending merger with Athena Purchaser, LLC (controlled by H.I.G. Capital), in response to stockholder lawsuits and demand letters alleging the proxy contained false and misleading disclosures. The company denies the allegations but voluntarily supplemented the proxy to moot the claims, and the merger terms and special meeting date remain unchanged.

What does a acquisition mean for MG stock?

A contract important enough that investors need to know about it — a big customer contract, a loan, a merger agreement or a partnership.

How do I read a 8-K?

A report of a major event, filed within four business days: results, deals, leadership changes, bankruptcy and more. The "Item" number tells you the topic (e.g. 2.02 results, 5.02 executive change, 1.01 new agreement, 1.03 bankruptcy). Exhibits (99.1 press release) usually hold the details.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 8-K (current report): A report of a major event, filed within four business days: results, deals, leadership changes, bankruptcy and more.

How did MG stock react to this filing?

MG closed at $20.19 before the filing and $20.20 on Nov 13, 2026 (+0.05%).

Other MG SEC filings

Get alerts when MG files with the SEC, plus live charts, key levels and news for 13,000+ stocks.

Try SEPT free for 7 days
MG overviewMG analysisMG newsLatest SEC filings