FORM 10-Q ☒QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGEACT OF 1934 For the quarterly period ended March 31, 2026 or ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGEACT OF 1934 Commission file number 1-13879 INNOSPEC INC. Registrant’s telephone number, including area code: (303) 792 5554 Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934: Common stock, par value $0.01 per share Indicate by check mark whether the registrant (1) has filedall reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filingrequirements for the past 90 days. Yes☒No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 ofRegulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such file.Yes☒No☐ Indicate by check mark whether the registrant is a large acceleratedfiler, an accelerated filer, a non-accelerated filer, or a smaller reporting company, or anemerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growthcompany” in Rule 12b-2 of the Exchange Act. Large accelerated filer☒Non-accelerated filer☐Emerging growth company☐ If an emerging growth company, indicate by checkmark if the registrant has elected not to use the extended transition period for complying with anynew or revised financial standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes☐No☒Indicate the number of shares outstanding of each ofthe issuer’s classes of common stock, as of the latest practicable date. TABLE OF CONTENTS PART IFINANCIAL INFORMATION2Item 1Condensed Consolidated Financial Statements2Condensed Consolidated Statements of Income2Condensed Consolidated Statements of Comprehensive Income3Condensed Consolidated Balance Sheets4Condensed Consolidated Statements of Cash Flows5Condensed Consolidated Statements of Equity6Notes To The Unaudited Interim Condensed Consolidated Financial Statements7Item 2Management’s Discussion and Analysis of Financial Condition and Results ofOperations for the Three months ended March 31, 2026 and 202517Critical Accounting Estimates17Results of Operations17Liquidity and Financial Condition21Item 3Quantitative and Qualitative Disclosures about Market Risk23Item 4Controls and Procedures23PART IIOTHER INFORMATION25Item 1Legal Proceedings25Item 1ARisk Factors25Item 2Unregistered Sales of Equity Securities and Use of Proceeds25Item 3Defaults Upon Senior Securities26Item 4Mine Safety Disclosures26Item 5Other Information26Item 6Exhibits27 SIGNATURES CAUTIONARY STATEMENT RELATIVE TO FORWARD-LOOKING STATEMENTS This Form 10-Q contains certain “forward-looking statements” within the meaning of the Private SecuritiesLitigation Reform Act of 1995. All statements other than statements of historical facts included orincorporated herein may constitute forward-looking statements. Such forward-looking statements includestatements (covered by words like “expects,” “estimates,” “anticipates,” “may,” “could,” “believes,” “feels,”“plans,” “intends,” “outlook” or similar words or expressions, for example) which relate to earnings, growthpotential, operating performance, events or developments that we expect or anticipate will or may occur inthe future. Although forward-looking statements are believed by management to be reasonable when made,they are subject to certain risks, uncertainties and assumptions, and our actual performance or results maydiffer materially from these forward-looking statements. Additional information regarding risks, uncertaintiesand assumptions relating to Innospec and affecting our business operations and prospects are described inInnospec’s Annual Report on Form 10-K for the year ended December 31, 2025, and other reports filed withthe U.S. Securities and Exchange Commission ("SEC"). You are urged to review our discussion of risks anduncertainties that could cause actual results to differ from forward-looking statements under the heading“Risk Factors” in such reports. Innospec undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. Item 1 Condensed Consolidated Financial Statements INNOSPEC INC. AND SUBSIDIARIESCONDENSED CONSOLIDATED STATEMENTS OF INCOME(Unaudited) INNOSPEC INC. AND SUBSIDIARIESCONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME(Unaudited) (in millions)Net income attributable to Innospec The accompanying notes are an inte