1 unchanged sentence
Trading Arrangements
−Removed: During the three months ended March 31, 2026, none of the Company’s directors or executive officers adopted , modified or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” each as defined in Item 408(a) of Regulation S-K.
+Added: During the three months ended June 30, 2026, none of the Company’s directors or executive officers adopted , modified or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” each as defined in Item 408(a) of Regulation S-K.
The following exhibits are being filed or furnished as part of this Quarterly Report on Form 10-Q:
+Added: 2.1 Share Purchase Agreement, dated as of May 1, 2026, by and among INEOS Calabrian Holdings Limited, INEOS Calabrian Canada Holdings Limited, INEOS Enterprises Holdings Limited, Ecovyst Inc., New Structure Subco Inc.
+Added: and EV Industrial Chemical Subsidiary Holdings Inc.
+Added: (incorporated by reference to Exhibit 2.1 to the Company’s Form 8-K, filed May 4, 2026)
+Added: 2.2 Deed of Amendment to Share Purchase Agreement, dated as of June 29, 2026 by and among INEOS Calabrian Holdings Limited, INEOS Calabrian Canada Holdings Limited, INEOS Enterprises Holdings Limited, Ecovyst Inc., New Structure Subco Inc.
+Added: and EV Industrial Chemical Subsidiary Holdings Inc.*
+Added: 10.1 Fourth Amendment Agreement, dated as of June 30, 2026, by and among Ecovyst Catalyst Technologies LLC, Eco Services Operations Corp., Ecovyst Midco II Inc., the other Guarantors party thereto, each 2026 Incremental Term Lender party thereto and UBS AG, Stamford Branch, as administrative agent (incorporated by reference to Exhibit 10.1 to the Company’s Form 8-K, filed June 30, 2026)
31.1 Certification of Chief Executive Officer of Ecovyst Inc.
9 unchanged sentences
101 The following materials from the Quarterly Report on Form 10-Q of Ecovyst Inc.
−Removed: for the quarter ended March 31, 2026, formatted in Inline XBRL:
−Removed: (i) Condensed Consolidated Statements of Income (Loss), (ii) Condensed Consolidated Statements of Comprehensive Income (Loss), (iii) Condensed Consolidated Balance Sheets, (iv) Condensed Consolidated Statements of Stockholders’ Equity, (v) Condensed Consolidated Statements of Cash Flows, (vi) Notes to Condensed Consolidated Financial Statements and (vii) document and entity information, tagged as blocks of text and including detailed tags
+Added: for the quarter ended June 30, 2026, formatted in Inline XBRL:
+Added: (i) Condensed Consolidated Statements of Income, (ii) Condensed Consolidated Statements of Comprehensive Income, (iii) Condensed Consolidated Balance Sheets, (iv) Condensed Consolidated Statements of Stockholders’ Equity, (v) Condensed Consolidated Statements of Cash Flows, (vi) Notes to Condensed Consolidated Financial Statements and (vii) document and entity information, tagged as blocks of text and including detailed tags
104 The cover page from the Quarterly Report on Form 10-Q of Ecovyst Inc.
−Removed: for the quarter ended March 31, 2026, formatted in Inline XBRL and included as Exhibit 101
+Added: for the quarter ended June 30, 2026, formatted in Inline XBRL and included as Exhibit 101
+Added: * Schedules and exhibits have been omitted pursuant to Item 601(a)(5) of Regulation S-K.
+Added: The registrant agrees to furnish supplementally a copy of any omitted schedule or exhibit to the U.S.
+Added: Securities and Exchange Commission upon request.
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
−Removed: May 5, 2026 By:
+Added: August 6, 2026 By:
/s/ MICHAEL FEEHAN
3 unchanged sentences
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.