Ecovyst director buys 24,875 shares at $10.05

A director of Ecovyst Inc. reported an open-market purchase of company shares, increasing her direct holdings.

Rhea-AI Filing Summary

Ecovyst Inc. (ECVT) director Patti A. Humble purchased 24,875 shares of Common Stock on September 10, 2026 in an open market or private transaction at a price of $10.05 per share. Following this transaction, she directly holds 33,974 shares of Ecovyst Common Stock, and no Rule 10b5-1 plan is reported.

Insider Trade Summary

Net Buyer: 24,875 shares

Net Buy 1 txn

Insider Humble Patti A.

Role Director

Bought 24,875 shs ($250K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	24,875	$10.05	$250K

Holdings After Transaction: Common Stock — 33,974 shares (Direct)

Key Figures

Shares purchased: 24,875 shares Purchase price per share: $10.05 per share Shares owned after transaction: 33,974 shares

3 metrics

Shares purchased 24,875 shares Common Stock bought by director on September 10, 2026

Purchase price per share $10.05 per share Price for the September 10, 2026 Common Stock purchase

Shares owned after transaction 33,974 shares Director’s direct holdings of Ecovyst Common Stock after the purchase

Key Terms

Rule 10b5-1 plan, open market or private transaction, Common Stock

3 terms

Rule 10b5-1 plan regulatory

"no Rule 10b5-1 plan is reported"

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

open market or private transaction financial

"Purchase in open market or private transaction"

Common Stock financial

"purchased 24,875 shares of Common Stock"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Ecovyst Inc. (ECVT) report on this Form 4?

Ecovyst director Patti A. Humble reported purchasing 24,875 shares of Ecovyst Common Stock on September 10, 2026 in an open market or private transaction at $10.05 per share.

How many Ecovyst (ECVT) shares does the reporting director own after the transaction?

After the reported purchase, director Patti A. Humble directly holds 33,974 shares of Ecovyst Common Stock, as stated in the Form 4 filing.

Was the Ecovyst (ECVT) insider trade made under a Rule 10b5-1 trading plan?

No. The filing indicates no Rule 10b5-1 plan is reported for the September 10, 2026 purchase by director Patti A. Humble.

What was the price paid per share in the Ecovyst (ECVT) insider purchase?

The director’s transaction was reported at a price of $10.05 per share for Ecovyst Common Stock in an open market or private transaction on September 10, 2026.

What type of Ecovyst (ECVT) security was involved in this Form 4 transaction?

The transaction involved Common Stock of Ecovyst Inc., with 24,875 shares purchased and total direct holdings reported at 33,974 shares afterward.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/14/2026 - 04:01 PM Accepted by SEC EDGAR 09/14/2026 - 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^*

Humble Patti A.

(Last) (First) (Middle)

C/O ECOVYST INC.

600 LEE ROAD, SUITE 200

(Street)

WAYNE PENNSYLVANIA 19087

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/10/2026

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

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

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

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	09/10/2026		P		24,875	A	$10.05	33,974	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:

	/s/ Joseph S. Koscinski, as attorney-in-fact for Patti A. Humble	09/14/2026
	** 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.
* Form 4: SEC 1474 (03-26)