[144] Materion Corporation SEC Filing

Rhea-AI Filing Summary

Materion Corporation (MTRN) filed a Form 144 disclosing that insider Gregory R. Chemnitz intends to sell up to 3,000 common shares on or about 08/04/2025 through Fidelity Brokerage Services on the NYSE. The proposed sale has an aggregate market value of $315,511.65, implying a reference price near $105.17 per share. With 20,726,917 shares outstanding, the transaction represents only ≈0.014 % of the float, signalling a limited dilution or price impact.

The shares derive from stock-based compensation: 2,486 units from stock-appreciation-right (SAR) exercises in 2019-2020 and 514 restricted shares that vested 03/01/2025. Chemnitz previously sold 2,000 shares on 05/05/2025 for $160,892.18. The filing affirms that the seller is unaware of undisclosed material adverse information.

No earnings, guidance, or operational data accompany the notice; its sole purpose is to comply with Rule 144 disclosure requirements for a non-material insider sale.

Insights

Securities Analyst

TL;DR: Small insider sale (0.014 % float); limited market impact, neutral signal.

The planned 3,000-share disposition equates to roughly one trading day’s average volume for MTRN and less than one-sixth of a percent of management’s typical ownership blocks. Insider sales can flag sentiment shifts, yet the modest size, compensation-derived source and prior small sale suggest routine portfolio diversification rather than a strategic exit. No financial metrics are provided, so valuation or guidance views remain unchanged.

Corporate Governance Expert

TL;DR: Filing fulfills Rule 144; governance compliance intact, impact minimal.

Form 144 simply notifies the market of a prospective trade; it is not a commitment. Chemnitz certifies absence of undisclosed negative information, supporting governance transparency. Sale timing aligns with standard post-vesting liquidity windows and could be executed under a 10b5-1 plan, limiting interpretative value. Given the de minimis percentage of outstanding shares, I classify the event as not impactful for shareholders.

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	3000	315511.65	20726917	08/04/2025	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	03/04/2019	SAR	Issuer			62	03/04/2019	Compensation
Common	03/15/2020	SAR	Issuer			2424	03/15/2020	Compensation
Common	03/01/2025	Restricted Stock Vesting	Issuer			514	03/01/2025	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	05/05/2025	2000	160892.18

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

How many Materion (MTRN) shares does the insider plan to sell?

3,000 common shares are listed for potential sale under Form 144.

When is the proposed sale date for the MTRN shares?

The filing lists an approximate sale date of 08/04/2025.

What is the market value of the shares listed in the Form 144?

The aggregate market value is $315,511.65, implying about $105.17 per share.

What percentage of Materion’s outstanding shares does 3,000 shares represent?

It equals roughly 0.014 % of the 20,726,917 shares outstanding.

Has the same insider sold Materion shares recently?

Yes, Gregory R. Chemnitz sold 2,000 shares on 05/05/2025 for $160,892.18.