Sec Form 4 Filing - INEOS Ltd @ Ecovyst Inc. - 2021-12-20

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person INEOS Ltd 2. Issuer Name and Ticker or Trading Symbol Ecovyst Inc. [ ECVT] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O IQ EQ, VICTORIA ROAD 3. Date of Earliest Transaction (MM/DD/YY) 12/20/2021 (Street) DOUGLAS, Y8IM2 4DF 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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, par value $0.01 12/20/2021 S 416,255 D( 1 ) $ 9.12 24,731,385 D( 1 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: 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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other INEOS Ltd C/O IQ EQ, VICTORIA ROAD DOUGLAS, Y8IM2 4DF X RATCLIFFE JAMES A C/O IQ EQ, VICTORIA ROAD DOUGLAS, Y8IM2 4DF X Signatures INEOS LIMITED, /s/ Jonny Ginns, Name: Jonny Ginns, Title: Authorized Signatory 12/20/2021 Signature of Reporting Person Date JAMES A. RATCLIFFE /s/ Jonny Ginns, attorney-in-fact for James A. Ratcliffe* 12/20/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )James A. Ratcliffe, as the majority owner of INEOS Limited, has the power to control the voting and disposition of the shares of common stock held by INEOS Limited. Mr. Ratcliffe disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein, and the inclusion of such securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

Remarks: *The Power of Attorney executed by James A. Ratcliffe, authorizing the signatory to sign and file this report on James A. Ratcliffe's behalf, filed as Exhibit 99.1 to the Schedule 13D filed with the Securities and Exchange Commission on November 23, 2021 by the Reporting Persons with respect to the common stock of the Issuer, is hereby incorporated by reference.

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).

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