BlackRock discloses 8.53M Ecovyst shares (ECVT) in Amendment No.2

Rhea-AI Filing Summary

Ecovyst Inc. beneficial ownership disclosure: BlackRock, Inc. filed Amendment No. 2 to a Schedule 13G/A reporting 8,526,153 shares of Ecovyst common stock, representing 7.7% of the class. The filing shows BlackRock has sole voting power for 8,351,981 shares and sole dispositive power for 8,526,153 shares. The signature on the amendment is dated 04/24/2026.

Insights

Institutional Ownership Analyst

BlackRock reports a meaningful passive stake of 7.7% in Ecovyst.

BlackRock's Schedule 13G/A amendment lists 8,526,153 shares and shows sole voting and dispositive powers largely concentrated in its reporting business units. The filing follows the passive investor reporting route typical for large asset managers.

Watch subsequent filings for any shift to an active Schedule 13D or changes in voting power; timing in this excerpt is anchored to the amendment signature dated 04/24/2026.

Legal/Compliance Specialist

The amendment clarifies which BlackRock units are aggregated and includes required exhibits.

The cover notes that holdings reflect securities of certain "Reporting Business Units" and excludes other BlackRock units per SEC Release No. 34-39538. Exhibit references include a Power of Attorney and Item 7 subsidiary identification.

Filing mechanics and classification are important; further exhibits may identify the specific subsidiary or business units tied to the reported position.

Key Figures

Beneficially owned shares: 8,526,153 shares Percent of class: 7.7% Sole voting power: 8,351,981 shares +2 more

5 metrics

Beneficially owned shares 8,526,153 shares Amount beneficially owned reported on Schedule 13G/A

Percent of class 7.7% Percent of common stock represented by the reported shares

Sole voting power 8,351,981 shares Number with sole power to vote or to direct the vote

Filing type Schedule 13G/A Amendment No. 2 Form type reported at top of excerpt

Signature date 04/24/2026 Date on signature block of the amendment

Key Terms

Schedule 13G/A, Beneficial ownership, Sole dispositive power, Reporting Business Units

4 terms

Schedule 13G/A regulatory

"Amendment No. 2 to a Schedule 13G/A reporting beneficial ownership"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Beneficial ownership financial

"Amount beneficially owned: 8526153 (b) Percent of class: 7.7 %"

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.

Sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 8526153"

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.

Reporting Business Units other

"securities beneficially owned by certain business units (collectively, the "Reporting Business Units")"

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

Ecovyst Inc.

(Name of Issuer)

Common Stock

(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

BlackRock, Inc.

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 8,351,981.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 8,526,153.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

8,526,153.00

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)

7.7 %

12

Type of Reporting Person (See Instructions)

HC

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: BlackRock, Inc. In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)	Address or principal business office or, if none, residence: BlackRock, Inc., 50 Hudson Yards New York, NY 10001
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 27923Q109
Item 4.	Ownership
(a)	Amount beneficially owned: 8526153
(b)	Percent of class: 7.7 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 8351981
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 8526153
	(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. Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the common stock of Ecovyst Inc.. No one person's interest in the common stock of Ecovyst Inc. is more than five percent of the total outstanding common shares.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit 99
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.

BlackRock, Inc.

Signature:	Spencer Fleming
Name/Title:	Managing Director
Date:	04/24/2026

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7

FAQ

What stake does BlackRock report in Ecovyst (ECVT)?

BlackRock reports beneficial ownership of 8,526,153 shares, equal to 7.7% of Ecovyst's common stock. The Schedule 13G/A amendment lists voting and dispositive powers and is signed on 04/24/2026.

Does BlackRock have voting control over its reported Ecovyst shares?

Yes. BlackRock reports sole voting power for 8,351,981 shares and sole dispositive power for 8,526,153 shares. The filing attributes these powers to specified Reporting Business Units of BlackRock, Inc.

What filing form did BlackRock use to report its Ecovyst holdings?

BlackRock used a Schedule 13G/A (Amendment No. 2) to report passive beneficial ownership. The cover cites SEC Release No. 34-39538 for aggregation of certain business units.

Are all BlackRock entities' holdings included in this filing?

No. The filing states it covers securities of certain "Reporting Business Units" and excludes securities held by other BlackRock business units disaggregated under the referenced SEC release.

What exhibits accompany the Schedule 13G/A amendment?

The amendment references Exhibit 24 (Power of Attorney) and Exhibit 99 (Item 7 subsidiary identification). The signature block shows the filing was signed by a Managing Director.