Ecovyst (ECVT) director Patti A. Humble submits initial insider Form 3

Rhea-AI Filing Summary

Ecovyst Inc. director Patti A. Humble filed an initial Form 3, which is a statement of beneficial ownership for company insiders. This filing does not list any stock transactions or option exercises and serves mainly to officially register her insider status with the SEC.

Key Terms

Form 3, beneficial ownership, reporting person

3 terms

Form 3 regulatory

"INSIDER FILING DATA (Form 3):"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

beneficial ownership financial

"initial statement of beneficial ownership for company insiders"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

reporting person regulatory

""reportingPersons": [ { "name": "Humble Patti A.""

Understanding Insider Trading Forms →

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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

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OMB Number:			3235-0104
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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. Date of Event Requiring Statement (Month/Day/Year)
05/20/2026

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

3a. Foreign Trading Symbol

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

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

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

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit 24.1 - Power of Attorney

No securities are beneficially owned.

	/s/ Joseph S. Koscinski, as attorney-in-fact for Patti A. Humble	05/26/2026
	** 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 5 (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 3: SEC 1473 (03-26)

FAQ

What does the Ecovyst Inc. (ECVT) Form 3 for Patti A. Humble show?

The Form 3 for Patti A. Humble shows her initial status as an insider and director of Ecovyst Inc. It does not report any stock purchases, sales, option exercises, or other transactions, serving mainly as a baseline ownership disclosure with the SEC.

Did Patti A. Humble buy or sell Ecovyst (ECVT) shares in this Form 3?

No, the Form 3 does not report any purchases or sales of Ecovyst shares by Patti A. Humble. All transaction counters, including buy, sell, and exercise shares, are zero, indicating no reportable trading activity in this filing.

What is the purpose of this Ecovyst (ECVT) Form 3 filing?

This Form 3 serves as Patti A. Humble’s initial statement of beneficial ownership as a director of Ecovyst Inc. It establishes her insider reporting status with the SEC but does not detail any current holdings or transactions in Ecovyst securities in the data provided.

Does the Ecovyst (ECVT) Form 3 include any derivative securities information?

No, the derivative section in this Form 3 is empty, and derivative-related counts such as exercise shares and derivative transactions are zero. This indicates no reported options, warrants, or other derivative positions for Patti A. Humble in this particular filing extract.

Are there any notable footnotes in Patti A. Humble’s Ecovyst (ECVT) Form 3?

The Form 3 includes a footnotes section, but the provided content does not show any substantive explanatory text. There are no additional disclosures about voting power, indirect ownership entities, or trading plans visible in the data excerpt.