MTRN Form 144 filing lists 864-share proposed sale on NYSE

Rhea-AI Filing Summary

Materion (MTRN) received a Form 144 notice for a proposed sale of common stock by an affiliated seller. The filing lists 864 shares to be sold through Fidelity Brokerage Services LLC, with an aggregate market value of $97,827.44, on or about 11/04/2025 on the NYSE.

The shares were acquired on 11/04/2025 via Stock Appreciation Rights as compensation. As context, shares outstanding were 20,732,741. The filing also notes a prior sale during the past three months: 3,000 shares of common stock sold on 08/04/2025 for $315,511.65 by Gregory R. Chemnitz.

Insights

Equity capital markets analyst

Routine Form 144; small insider sale, neutral impact.

The notice covers a proposed sale of 864 shares with an aggregate value of $97,827.44, to be executed on or about 11/04/2025 on the NYSE. The seller plans to transact through Fidelity Brokerage Services LLC.

The shares were acquired via stock appreciation rights on the same date as compensation. The excerpt also lists a prior 3‑month sale of 3,000 shares for $315,511.65 by Gregory R. Chemnitz. Based on the disclosed sizes relative to 20,732,741 shares outstanding, this appears administratively routine.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	864	97827.44	20732741	11/04/2025	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	11/04/2025	Stock Appreciation Rights	Issuer			864	11/04/2025	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Gregory R. Chemnitz 6070 Parkland Blvd. Mayfield Heights OH 44124	Common	08/04/2025	3000	315511.65

144: Remarks and Signature

Remarks

Date of Notice

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What did Materion (MTRN) disclose in this Form 144?

A proposed sale of 864 common shares with an aggregate market value of $97,827.44, to be sold on or about 11/04/2025 on the NYSE.

How were the MTRN shares to be sold acquired?

They were acquired on 11/04/2025 via Stock Appreciation Rights as compensation.

Who is the broker for the proposed MTRN sale and where will it occur?

The broker is Fidelity Brokerage Services LLC, and the sale is listed for the NYSE.

How many Materion shares are outstanding as context?

20,732,741 shares were outstanding, as listed in the filing.

Were there recent sales of MTRN stock by the filer?

Yes. The filing notes a sale of 3,000 shares on 08/04/2025 for $315,511.65 by Gregory R. Chemnitz.

What is the size of the proposed MTRN sale relative to the filing?

The proposed sale covers 864 shares with an aggregate market value of $97,827.44.