Hotchkis & Wiley reports 4.90% stake in Ecovyst (ECVT)

Rhea-AI Filing Summary

Ecovyst Inc. Schedule 13G/A amendment reports that Hotchkis and Wiley Capital Management, LLC beneficially owns 5,413,862 shares of Ecovyst common stock, representing 4.90% of the class. The filing shows sole voting power over 4,720,982 shares and sole dispositive power over 5,413,862 shares. The filing is signed by Tina H. Kodama, Chief Compliance Officer.

Insights

Institutional Ownership Specialist

Minor passive stake disclosed by an investment manager.

Hotchkis and Wiley Capital Management reports a 4.90% beneficial ownership position in Ecovyst, consistent with a passive investment filing under beneficial ownership rules. The position size is below the 5% reporting threshold that would often trigger other filing requirements.

Timing and changes versus prior holdings are not provided in the excerpt; subsequent or prior amendments would clarify trends.

Proxy and Voting Analyst

Voting and dispositive powers are not identical for this holder.

The filing notes that certain HWCM clients retain voting power while HWCM retains dispositive power for 5,413,862 shares, indicating differing voting arrangements across client accounts. This distinction affects who may direct votes at shareholder meetings.

Shareholder meeting influence depends on client voting retention; check future amendments for any voting changes.

Key Figures

Beneficial ownership: 5,413,862 shares Percent of class: 4.90% Sole voting power: 4,720,982 shares +2 more

5 metrics

Beneficial ownership 5,413,862 shares Amount beneficially owned as disclosed in the Schedule 13G/A

Percent of class 4.90% Percent of common stock represented by the beneficial ownership

Sole voting power 4,720,982 shares Number of shares with sole power to vote

Sole dispositive power 5,413,862 shares Number of shares with sole power to dispose

CUSIP 27923Q109 CUSIP for Ecovyst common stock shown on the filing

Key Terms

beneficially owned, sole voting power, sole dispositive power

3 terms

beneficially owned regulatory

"Item 4. | Ownership (a) | Amount beneficially owned: 5,413,862"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole voting power regulatory

"Item 4. | (i) Sole power to vote or to direct the vote: 4,720,982"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power regulatory

"Item 4. | (iii) Sole power to dispose or to direct the disposition of: 5,413,862"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 4)

Ecovyst Inc.

(Name of Issuer)

Common stock, par value $0.01 per share

(Title of Class of Securities)

27923Q109

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 27923Q109

1

Names of Reporting Persons

Hotchkis and Wiley Capital Management, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 4,720,982.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 5,413,862.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,413,862.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.90 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Ecovyst Inc.
(b)	Address of issuer's principal executive offices: 600 LEE ROAD, SUITE 200, WAYNE, PA, 19087
Item 2.
(a)	Name of person filing: Hotchkis and Wiley Capital Management, LLC
(b)	Address or principal business office or, if none, residence: 601 S. Figueroa Street, 39th Fl, Los Angeles, CA 90017
(c)	Citizenship: Delaware
(d)	Title of class of securities: Common stock, par value $0.01 per share
(e)	CUSIP No.: 27923Q109
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 5,413,862
(b)	Percent of class: 4.90%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 4,720,982
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 5,413,862
	(iv) Shared power to dispose or to direct the disposition of: 0 Note that certain of HWCM's clients have retained voting power over the Common Shares that they beneficially own. Accordingly, HWCM has the power to dispose of more Common Shares than it can vote.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Hotchkis and Wiley Capital Management, LLC

Signature:	Tina H. Kodama
Name/Title:	Tina H. Kodama | Chief Compliance Officer
Date:	05/08/2026

FAQ

What stake does Hotchkis and Wiley hold in Ecovyst (ECVT)?

Hotchkis and Wiley beneficially owns 5,413,862 shares, equal to 4.90% of Ecovyst's common stock. The filing lists both voting and dispositive powers, with dispositive control over the full 5,413,862 shares.

How many votes can Hotchkis and Wiley cast for Ecovyst (ECVT) shares?

The filing reports sole voting power for 4,720,982 shares. It also notes that some clients retain voting rights, so HWCM's voting authority differs from its dispositive control.

Does this 13G/A amendment indicate active trading by Hotchkis and Wiley in ECVT?

No trading activity is shown; the amendment discloses a beneficial ownership snapshot of 5,413,862 shares representing 4.90%. It does not state purchases, sales, or timing within the provided excerpt.

Who signed the Schedule 13G/A for Ecovyst (ECVT)?

The Schedule 13G/A amendment is signed by Tina H. Kodama, identified as Chief Compliance Officer. The signature date on the excerpt is 05/08/2026.