CABOT FRD LLC

mpensation each year in January, up to a maximum deferral rate of 15 %. Participants may choose to opt out or change their contribution rate at any time. Company Contributions The Company matching contribution is 100 % up to the first 6 % of eligible compensation and is made each pay period. The Plan also provides an employer matching true up contribution at year-end to ensure all participants receive a total match in the amount of the lesser of (1) 100% of the participant’s contribution for the year; or (2) 6% of the participant’s eligible compensation for the year. In addition to the match, a Company retirement contribution of 4 % of eligible earnings is made each pay period. The Company match and Company retirement contributions are invested in accordance with participant allocations. T

tems presented in the Statement of Net Assets Available for Benefits. 4. Forfeitures Upon termination of a participant’s employment with the Company before his or her benefits are fully vested, the unvested portion of the Company retirement contributions is forfeited. The Plan allows the Company to apply participant forfeitures toward Plan expenses or to be used to make Company contributions. During the year ending December 31, 2025, the Company used $ 300,328 of participant forfeitures toward the payment of the Company contribution. As of December 31, 2025, and 2024, participant forfeitures totaling $ 91,658 and $ 233,406 , respectively, were available for future use by the Company. 8 5. Administrative Expenses The Plan permits the payment of usual and reasonable expenses not paid by the

ke catch-up contributions. Participants may also contribute amounts representing distributions from other qualified defined benefit or defined contribution plans. Participants are automatically enrolled in the Plan if they do not make an election to contribute within 60 days of their eligibility to participate. Participants who are automatically enrolled are deemed to have made an election to make pre-tax contributions in an amount of 6 % of their eligible compensation and to increase this contribution rate by 1 % of employee eligible compensation each year in January, up to a maximum deferral rate of 15 %. Participants may choose to opt out or change their contribution rate at any time. Company Contributions The Company matching contribution is 100 % up to the first 6 % of eligible compen

5,950 Participant contributions 14,589,405 Rollovers 1,790,287 Subtotal of contributions 30,575,642 Total additions 137,035,027 Deductions Benefits paid to participants 88,064,122 Administrative expenses 269,123 Subtotal of Deductions 88,333,245 Total Net increase in net assets 48,701,782 Net assets available for benefits Beginning of year 875,636,357 End of year $ 924,338,139 See notes to financial statements. 4 Cabot 401(k) Plan Notes to Financial Statements as of December 31, 2025 and 2024, and for the Year Ended December 31, 2025 1. Description of the Plan General Cabot Corporation (“Cabot” or the “Company”) initially adopted the Cabot Corporation Employee Stock Ownership Plan (the “ESOP”) in 1988, the Cabot Retirement Incentive Savings Plan in 1994 (previously the Cabot Profit-Sharing