Dimensional’s 6% Ecovyst Inc (NYSE: ECVT) holding disclosed in 13G/A

Rhea-AI Filing Summary

Dimensional Fund Advisors LP filed an amended Schedule 13G reporting beneficial ownership of 6,585,047 shares of Ecovyst Inc common stock, representing 6.0% of the class as of 06/30/2026. Dimensional reports sole voting power over 6,484,301 shares and sole dispositive power over 6,585,047 shares.

The shares are held across investment companies, commingled funds, group trusts and separate accounts it advises (the “Funds”). Dimensional may be deemed to be the beneficial owner because it has voting and/or investment power, but it states that all securities are owned by the Funds and disclaims beneficial ownership, noting that to its knowledge no single Fund owns more than 5% of the class.

Key Figures

Beneficial ownership: 6,585,047 shares Percent of class: 6.0% Sole voting power: 6,484,301 shares +2 more

5 metrics

Beneficial ownership 6,585,047 shares Dimensional Fund Advisors LP beneficially owned 6,585,047 Ecovyst Inc common shares

Percent of class 6.0% Reported percentage of Ecovyst Inc common stock beneficially owned

Sole voting power 6,484,301 shares Shares for which Dimensional has sole power to vote or direct the vote

Sole dispositive power 6,585,047 shares Shares for which Dimensional has sole power to dispose or direct disposition

Reporting date 06/30/2026 Date associated with the Schedule 13G/A ownership information

Key Terms

beneficial owner, sole power to vote, dispose or to direct the disposition, disclaims beneficial ownership

4 terms

beneficial owner financial

"may be deemed to be the beneficial owner of the shares of the Issuer"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

sole power to vote financial

"Sole power to vote or to direct the vote: 6,484,301"

dispose or to direct the disposition financial

"Sole power to dispose or to direct the disposition of: 6,585,047"

disclaims beneficial ownership financial

"Dimensional disclaims beneficial ownership of such securities"

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Available on EDGAR 07/14/2026 - 01:27 PM Accepted by SEC EDGAR 07/14/2026 - 01:27 PM Learn about SEC filing dates

FAQ

What percentage of Ecovyst Inc (ECVT) does Dimensional Fund Advisors report owning?

Dimensional Fund Advisors reports beneficial ownership of 6.0% of Ecovyst Inc’s common stock. This corresponds to 6,585,047 shares reported on an amended Schedule 13G as of 06/30/2026.

How many Ecovyst Inc (ECVT) shares does Dimensional Fund Advisors have voting power over?

Dimensional Fund Advisors reports sole voting power over 6,484,301 Ecovyst Inc shares. It reports no shared voting power, reflecting its authority to vote these shares held in client funds it advises.

What is Dimensional Fund Advisors’ dispositive power over Ecovyst Inc (ECVT) shares?

Dimensional Fund Advisors reports sole dispositive power over 6,585,047 Ecovyst Inc shares. It reports no shared dispositive power, meaning it can direct how these shares are disposed of for the client funds it manages.

Who actually owns the Ecovyst Inc (ECVT) shares reported by Dimensional Fund Advisors?

All Ecovyst Inc shares reported are owned by the Funds advised by Dimensional Fund Advisors. Dimensional may be deemed a beneficial owner due to voting and investment power but expressly disclaims beneficial ownership of these securities.

Does any single Dimensional-managed fund hold over 5% of Ecovyst Inc (ECVT)?

According to Dimensional Fund Advisors, to its knowledge the interest of any one Fund in Ecovyst Inc does not exceed 5% of the outstanding common stock, even though the Funds collectively hold 6.0%.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Ecovyst Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

27923Q109

(CUSIP Number)

06/30/2026

(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

Dimensional Fund Advisors LP

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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 6,484,301.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 6,585,047.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

6,585,047.00

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)

6.0 %

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: 300 Lindenwood Drive, Valleybrooke Corporate Center, Malvern, PA 19355
Item 2.
(a)	Name of person filing: Dimensional Fund Advisors LP
(b)	Address or principal business office or, if none, residence: 6300 Bee Cave Road, Building One, Austin, TX 78746
(c)	Citizenship: Delaware Limited Partnership
(d)	Title of class of securities: Common Stock
(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: 6,585,047 ** see Note 1 ** ** Note 1 ** Dimensional Fund Advisors LP, an investment adviser registered under Section 203 of the Investment Advisors Act of 1940, furnishes investment advice to four investment companies registered under the Investment Company Act of 1940, and serves as investment manager or sub-adviser to certain other commingled funds, group trusts and separate accounts (such investment companies, trusts and accounts, collectively referred to as the "Funds"). In certain cases, subsidiaries of Dimensional Fund Advisors LP may act as an adviser or sub-adviser to certain Funds. In its role as investment advisor, sub-adviser and/or manager, Dimensional Fund Advisors LP or its subsidiaries (collectively, "Dimensional") may possess voting and/or investment power over the securities of the Issuer that are owned by the Funds, and may be deemed to be the beneficial owner of the shares of the Issuer held by the Funds. However, all securities reported in this schedule are owned by the Funds. Dimensional disclaims beneficial ownership of such securities. In addition, the filing of this Schedule 13G shall not be construed as an admission that the reporting person or any of its affiliates is the beneficial owner of any securities covered by this Schedule 13G for any other purposes than Section 13(d) of the Securities Exchange Act of 1934.
(b)	Percent of class: 6.0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 6,484,301** see Note 1 **
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 6,585,047** see Note 1 **
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The Funds described in Note 1 above have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the securities held in their respective accounts. To the knowledge of Dimensional, the interest of any one such Fund does not exceed 5% of the class of securities. Dimensional Fund Advisors LP disclaims beneficial ownership of all such securities.
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.

Dimensional Fund Advisors LP

Signature:	Selwyn Notelovitz
Name/Title:	Global Chief Compliance Officer
Date:	07/14/2026