and Exhibit 99.1 hereto shall not be deemed incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended (“Securities Act”), unless otherwise expressly indicated in such registration statement or other document.

Class II director — Shelley Bausch: The Board appointed Shelley Bausch as a new Class II director and to the Audit Committee.

and Exhibit 99.1 hereto shall not be deemed incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended (“Securities Act”), unless otherwise expressly indicated in such registration statement or other document.

Regulation FD Disclosure Dividend and Share Repurchase Authorization The Company also announced in the Press Release that on May 1, 2026, the Company’s Board of Directors declared a semi-annual cash dividend of $0.92 per share on the Company’s Common Stock, par value $0.01 per share (“Common Stock”). The dividend will be paid on May 29, 2026 to shareholders of record as of May 19, 2026. In addition, the Board of Directors authorized the repurchase of up to $75 million in shares of the Company…

Results of Operations and Financial Condition. On February 17, 2026, Innospec Inc. (the “Company”) issued a press release announcing its financial results for the fiscal quarter and year ended December 31, 2025 (the “Press Release”).

Regulation FD Disclosure The Press Release also announced that on November 2, 2025, the Company’s Board of Directors declared a semi-annual dividend of $0.87 per share on the Company’s common stock (IOSP). The dividend will be paid on November 26, 2025, to holders of record on November 18, 2025.

Results of Operations and Financial Condition. On November 4, 2025, Innospec Inc. (the “Company”) issued a press release announcing its financial results for the fiscal quarter ended September 30, 2025 (the “Press Release”).

Results of Operations and Financial Condition. On August 5, 2025, Innospec Inc. (the “Company”) issued a press release announcing its financial results for the fiscal quarter ended June 30, 2025 (the “Press Release”).

Regulation FD Disclosure The Press Release also announced that on May 2, 2025, the Company’s Board of Directors declared a semi-annual dividend of $0.84 per share on the Company’s common stock (IOSP). The dividend will be paid on May 30, 2025 to holders of record on May 20, 2025.

Results of Operations and Financial Condition. On May 8, 2025, Innospec Inc. (the “Company”) issued a press release announcing its financial results for the fiscal quarter ended March 31, 2025 (the “Press Release”).

Regulation FD Disclosure On March 10, 2025, the Board of Directors of Innospec Inc. (the “Company”) authorized the repurchase of up to $50 million in shares of the Company’s outstanding common stock over a three-year period commencing on March 10, 2025. The timing, manner, price and amount of any repurchases will be determined in the discretion of management, depending on market conditions and other factors. Repurchases may be made through open market purchases and accelerated share repurchas…

Results of Operations and Financial Condition. On February 18, 2025, Innospec Inc. (the “Company”) issued a press release announcing its financial results for the fiscal quarter and year ended December 31, 2024 (the “Press Release”).

Results of Operations and Financial Condition. On November 5, 2024, Innospec Inc. (the “Company”) issued a press release announcing its financial results for the fiscal quarter ended September 30, 2024 (the “Press Release”).

Regulation FD Disclosure The Press Release also announced that on November 4, 2024, the Company’s Board of Directors declared a semi-annual dividend of $0.79 per share on the Company’s common stock (IOSP). The dividend will be paid on November 26, 2024, to holders of record on November 18, 2024.

Results of Operations and Financial Condition. On August 6, 2024, Innospec Inc. (the “Company”) issued a press release announcing its financial results for the fiscal quarter ended June 30, 2024 (the “Press Release”).

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. See

Entry into a Material Definitive Agreement. As disclosed in its Form 8-K filed May 31, 2023, Innospec Inc. (the “Company”) and certain subsidiaries of the Company (together with the Company, the “Borrowers”) entered into a Multicurrency Revolving Facility Agreement with various lenders (the “Agreement”) providing for a $250,000,000 multicurrency revolving loan facility available to the Borrowers (the “Facility”). The Agreement initially provided that the termination date of the Facility was M…

Results of Operations and Financial Condition. On May 9, 2024, Innospec Inc. (the “Company”) issued a press release announcing its financial results for the fiscal quarter ended March 31, 2024 (the “Press Release”).

Regulation FD Disclosure The Press Release also announced that on May 2, 2024, the Company’s Board of Directors declared a semi-annual dividend of $0.76 per share on the Company’s common stock (IOSP). The dividend will be paid on May 31, 2024 to holders of record on May 20, 2024.

COO — Dr. Philip Boon: The announcement is a planned retirement of the COO effective in one year with a transition to a consultancy role, representing an orderly succession rather than a sudden loss.