Ecovyst officer awarded 11,052 common shares

Ecovyst Inc. officer Joseph S. Koscinski reported an equity award of common stock.

Rhea-AI Filing Summary

Ecovyst Inc. officer Joseph S. Koscinski reported an equity award of common stock. On March 4, 2026, he acquired 11,052 shares of Ecovyst common stock in a grant or award transaction at a stated price of $11.31 per share. Following this award, his directly held common stock position increased to 595,784 shares, reflecting his updated ownership stake.

Insider Trade Summary

Grant/Award: 11,052 shares

Grant/Award 1 txn

Insider Koscinski Joseph S.

Role See Remarks

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	11,052	$11.31	$125K

Holdings After Transaction: Common Stock — 595,784 shares (Direct)

FAQ

What insider transaction did Ecovyst (ECVT) report for Joseph S. Koscinski?

Ecovyst reported that officer Joseph S. Koscinski received a grant or award of 11,052 shares of common stock. This was an acquisition transaction, not an open-market purchase, and increased his directly held Ecovyst share balance.

When did the Ecovyst (ECVT) insider share award to Joseph S. Koscinski occur?

The grant or award to Joseph S. Koscinski occurred on March 4, 2026. The Form 4 records this date as the official transaction date for the 11,052 Ecovyst common shares he acquired in the award.

How many Ecovyst (ECVT) shares did Joseph S. Koscinski hold after the award?

After the March 4, 2026 equity award, Joseph S. Koscinski directly held 595,784 shares of Ecovyst common stock. This total reflects his updated ownership immediately following the 11,052-share grant or award.

What was the reported price for the Ecovyst (ECVT) shares granted to Joseph S. Koscinski?

The Form 4 lists a transaction price of $11.31 per share for the 11,052 Ecovyst common shares granted to Joseph S. Koscinski on March 4, 2026 as part of the equity award.

Was the Ecovyst (ECVT) transaction by Joseph S. Koscinski a purchase or an award?

The transaction was classified as a grant or award acquisition, not an open-market purchase. The Form 4 uses code A, meaning Koscinski acquired 11,052 Ecovyst common shares through an equity award arrangement.

Is Joseph S. Koscinski’s Ecovyst (ECVT) ownership direct or indirect after this transaction?

After the March 4, 2026 award, Joseph S. Koscinski held 595,784 Ecovyst common shares with direct ownership. The filing classifies his ownership type as direct, with no additional nature of ownership noted.

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Accepted by SEC EDGAR 03/06/2026 - 04:00 PM Learn about SEC filing dates

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^*

Koscinski Joseph S.

(Last) (First) (Middle)

C/O ECOVYST INC.

600 LEE ROAD, SUITE 200

(Street)

WAYNE PA 19087

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Ecovyst Inc. [ ECVT ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	See Remarks

3. Date of Earliest Transaction (Month/Day/Year)
03/04/2026

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	03/04/2026		A		11,052	A	$11.31	595,784	D

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:

Remarks:

Vice President, Chief Administrative Officer, General Counsel and Secretary

	/s/ Joseph S. Koscinski	03/06/2026
	** 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.