Mistras Group files merger proxy for $20.35-per-share H.I.G. Capital buyout

What happened

Mistras Group, Inc. (NYSE: MG) filed a definitive proxy statement on Oct. 27, 2026, asking stockholders to approve its previously announced merger with affiliates of private investment firm H.I.G. Capital, LLC, according to the filing.

The merger agreement was signed Sept. 17, 2026, among Mistras, Athena Purchaser, LLC, and Athena Merger Sub, Inc., a subsidiary of Athena Purchaser. Under the deal, Athena Merger Sub would merge into Mistras, and Mistras would survive as a wholly owned subsidiary of Athena Purchaser. Parent and Acquisition Sub are controlled by funds affiliated with H.I.G. Capital.

If the merger closes, each holder of Mistras common stock will receive $20.35 per share in cash, without interest, subject to applicable withholding taxes, unless the holder properly demands and perfects statutory appraisal rights under Delaware law.

A special meeting of stockholders is scheduled to be held virtually on Nov. 24, 2026, at 9:00 a.m. Eastern Time. The record date for determining who may vote is Oct. 19, 2026. Stockholders are being asked to vote on three proposals: adopting the merger agreement, approving adjournment of the meeting if needed to gather more votes, and approving, on a non-binding advisory basis, compensation that may be paid to named executive officers in connection with the merger.

The Mistras board unanimously determined the merger agreement and the merger are advisable, fair to and in the best interests of the company and its stockholders, and unanimously recommends that stockholders vote "FOR" all three proposals, the filing states.

Approval of the merger proposal requires the affirmative vote of a majority of the outstanding shares of common stock entitled to vote on the matter. The filing says a failure to vote, a broker non-vote or an abstention has the same effect as a vote "AGAINST" the merger proposal.

Mistras shares closed at $20.45 on the day the proxy was filed, down 3.72% from the prior close of $21.24, according to the price data. That closing price was $0.10 above the $20.35 per-share merger consideration.

What Mistras does

Mistras Group is an engineering services company based in Princeton Junction, New Jersey, listed on the New York Stock Exchange under the ticker MG. Its business is listed in the filing materials under the Services-Engineering Services category. The company's address is 195 Clarksville Road, Princeton Junction, New Jersey 08550.

What this means

A DEFM14A is a "definitive" proxy statement — the final version of the document a public company must send stockholders before they vote on a major transaction such as a merger. Earlier, preliminary versions can be filed and revised; the word "definitive" signals that this is the version being mailed and used for the actual vote. It satisfies the SEC's disclosure rules under Section 14(a) of the Securities Exchange Act of 1934.

The core proposal is an all-cash take-private merger. Athena Merger Sub, a shell company created for the transaction by the H.I.G. Capital-affiliated buyers, would merge into Mistras and cease to exist, with Mistras surviving as a subsidiary owned by the buyer. That is why the filing describes the Company as "surviving the merger as a wholly owned subsidiary of Parent." Once the merger closes, Mistras shares would no longer trade on the NYSE, and the $20.35 per share would effectively be the price paid for each share.

The $20.35 per-share price is fixed in the merger agreement; it is not a market quote. The $20.45 closing price on the filing date was slightly above that, which means the market was pricing the shares near the deal terms. The filing does not explain why the stock moved 3.72% on the day.

Appraisal rights, referenced in the filing, are a Delaware-law feature: a stockholder who votes against the merger (or abstains in the required way) and follows the procedures in Section 262 of the Delaware General Corporation Law can ask a court to determine the "fair value" of their shares instead of accepting the merger price. Exercising them requires delivering a written demand to the company before the vote and complying with the statute; the statute's text is attached as Appendix D to the proxy.

The advisory "say-on-golden-parachute" vote is a non-binding vote on compensation that may be paid to named executive officers because of the merger. It does not block the deal.

The next scheduled step is the Nov. 24, 2026 virtual special meeting. If the merger proposal is adopted, the transaction would proceed toward closing subject to the conditions in the merger agreement, which are described in the proxy but not in the excerpt provided. If the vote fails, the filing says the board could seek adjournment to solicit additional proxies.