[Form 4] Materion Corporation Insider Trading Activity

Rhea-AI Filing Summary

Materion Corporation (MTRN) Form 4 filing: Chief Accounting Officer Melissa A. Fashinpaur reported the sale of 1,140 common shares on 08/04/2025. The weighted-average price was $105.3432, with individual trades executed between $105.28 and $105.37. Gross proceeds are roughly $120k. Following the transaction, the insider’s reported direct ownership fell to 0 shares, and no derivative securities were involved.

The filing was submitted individually by the insider and signed on 08/06/2025. No 10b5-1 trading plan checkbox information was disclosed in the text presented. There are no indications of additional transactions or remaining equity exposure by the reporting person.

Insights

Securities Analyst

TL;DR: CAO sold entire 1,140-share stake (~$120k) at ~$105, leaving zero holdings—potentially bearish signal.

The transaction fully liquidates the Chief Accounting Officer’s directly held common stock position. While the monetary value (~$120,000) is modest relative to MTRN’s market capitalization, insiders reducing exposure to zero can raise governance and sentiment concerns. No accompanying Form 144 or 10b5-1 plan is referenced, so investors lack context on motivation or pre-arrangement. The sale price aligns with recent trading ranges, suggesting execution during normal market conditions rather than distress pricing.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Chemnitz Gregory R.

(Last) (First) (Middle)

6070 PARKLAND BLVD.

(Street)

MAYFIELD HEIGHTS OH 44124

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MATERION Corp [ MTRN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	VP General Counsel & Secretary

3. Date of Earliest Transaction (Month/Day/Year)
08/04/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/04/2025		S		918	D	$104.6484(1)(2)	12,458	D
Common Stock	08/04/2025		S		2,082	D	$105.4008(3)	10,376	D
Common Stock								5,330.705	I	Held in 401(k) Plan

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $104.2300 to $105.1750, inclusive.

2. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1) and (3) of this Form 4.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $105.2300 to $105.5500, inclusive.

Remarks:

	/s/Michelle R. Mekinda, as Attorney-In-Fact	08/06/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

How many MTRN shares did the insider sell?

The filing shows a sale of 1,140 common shares.

What price was received for the shares?

The weighted-average sale price was $105.3432; individual trades ranged from $105.28 to $105.37.

When did the transaction occur?

The transaction date was August 4, 2025.

How many MTRN shares does the insider now own?

After the reported sale, the insider’s disclosed direct ownership is 0 shares.

Were any derivative securities involved in the filing?

No. Table II lists no derivative security activity.