MTX Q2 2025 Earnings Presentation

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2 Forward-Looking Statements and Non-GAAP Measures This presentation may contain "forward -looking statements" within the meaning of the Pri vate Securities Litigation Reform Act of 1995. Forw ard-looking statements provide current expect ations and forecasts of future events such as new products, revenues, and financial performance, and are not limited to describing historical or current facts. They can be identified by th e use of words such as “believes,” “expects,” “plans,” “intends,” “anticipates,” and other words and phrases of similar meaning. Forward-looking statement s are necessarily based on assumptions, estimates, and limited informati on available at the time they are made. A broad variety of risks and uncertainties, both known and unknown, as well as the inaccuracy of assumption s and estimates, can affect the realization of the expectations or fore casts in these statements. Actual future results may vary materially. Significant factors that could affect the expectations and forecasts inc lude worldwide general economic, business, and industry conditions; the c yclicality of our customers’ businesses and their changing regional demands; our ability to compete in very compet itive industries; consolidation in customer industrie s, principally paper, foundry, and steel; our ability to ren ew or extend long term sales contracts for our satellite operations; our ability to generate cash to service our debt; our ability to comply with the covenants in the agreements governing our debt; our ability to effectively achieve and implement our growth initiatives or consummate the transactions described in the statements; our ability to successfully develop new products; our abi lity to defend our intellectual property; the increased risks of doing bu siness abroad; the availability of raw materials and access to ore reserves at our mining operations, or increases in costs of raw materials, energy, or shi pping; compliance with or changes to regulation in the areas of environmenta l, health and safety, and tax; risks and uncertainties related to the voluntary petitions for relief under Chapter 11 of the U.S. Bank ruptcy Code filed by our subsidiaries BMI OldCo Inc. (f/k/a Barretts Minerals Inc.) and Barretts Ventures Texas LLC; claims for legal , environmental, and tax matters or product stewardship issues; operating risks and capacity limitations a ffecting our production facilities; seasonality of some of our businesses; cybersecurity and other threats relating to our information technology systems; and other risk factors and cautionary statements in our 2024 Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and other reports filed with the Securities and Exchange Commission. The Company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events, or otherwise. Also, this presentation will include certain financial measures that we re not prepared in accordance with gener ally accepted accounting principles. In particular, operating income, oper ating margin, adjusted EBITDA, adjusted EBITDA margin, and EPS referenced in this presentation exclude special items, such as acquisition-related costs, restructuring, gains/(losses) on asset sales, litigation and impairment costs, and other significant non-recurring or unusual items and related tax effects for all periods presented. The Compa ny also provides figures for free cash flow for the three and six months end ed June 29, 2025. These are non-GAAP measures that the Company believes provide meaningful supplemental informa tion regarding its performance as inclusion of such special items are not indicative of the ongoin g operating results and thereby affect the comparability of results between periods. The Company believes inclusion of these non-GAAP measures also provides consistency in its financial reporting and facilitates investors' understanding of historic operating trends. Reconciliations of these non-GAAP financial measures to the most directly comparable GAAP financial measur es can be found in the appendix to this presentation and our Current Report on Form 8-K dated July 24, 2025, and in our other reports filed with the Securities and Exchange Commission, available on our website at www.mineralst ech.com in the "Investor Information -- SEC Filings" section. It is no t possible, without unreasonable effort, for the Company to identify and estimate the amount or significance of future non-recurring or unusual items. Accordingly, the Company does not provide reconciliations of forward-looking non-GAAP financial measures to the most comparable GAAP financial measures on a forward-looking basis.

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Douglas T. Dietrich Chairman and Chief Executive Officer

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4 Second Quarter 2025 Overview $529M Sales +8% vs. Prior Quarter +200bps vs. Prior Quarter Operating income, operating margin, and earnings per share exclude special items +25% vs. Prior Quarter +36% vs. Prior Quarter  Historically strong quarter amid ongoing market volatility  Sales rates expanded through the quarter as expected  Operational agility translated into solid margin results  Strong cash conversion in the quarter  Returned $22 million to shareholders $79M Operating Income 14.9% Operating Margin $1.55 Earnings Per Share

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5 Market Update  Similar cat litter market conditions to H1’25  Strong conditions for specialty solutions  Mixed market conditions in paper & packaging, residential construction  Flat automotive markets  Food and pharma remains strong  North America relatively stable market conditions  Continued weak conditions in Europe  China resilient despite tariffs  Commercial construction and environmental lining markets stabilized Household & Personal Care Specialty Additives High- Temperature Technologies Environmental & Infrastructure Consumer & Specialties Engineered Solutions  Increased promotional activity and new product launches in cat litter  Multiple investments to support growth and productivity across the product line  3 new satellites and 1 expansion coming online  First Minscan® LSC in Europe  Strong pipeline for newest refractory products  Several large projects in the pipeline  Continued strong pull for infrastructure and water/soil remediation solutions Near-term growth driversMarket outlook

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Erik C. Aldag Senior Vice President, Finance and Treasury and Chief Financial Officer

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7 Second Quarter Financial Summary Operating income, operating margin, and earnings per share exclude special items Second Quarter versus First Quarter ($M) 14.9% Operating Margin 12.9% Operating Margin 63 79 Q1 ’25 +2 FX +9 Vol / Mix +1 Price +4 Cost Q2 ’25 +25% Q1 ’25 +7 FX +3 0 Vol / Mix +1 Price Q2 ’25 492 529 +8% Sales Operating Income SeqYoYQ2 ‘25 +8%(2%)529Sales ($M) +160bps(70bps)25.9Gross Margin (%) +25%(7%)79Operating Income ($M) +200bps(80bps)14.9Operating Margin (%) +36%(6%)1.55EPS ($)

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8 Sales Performance  More stable order patterns compared with Q1  Growth initiatives in consumer specialty applications continue  Softer conditions YoY for paper & packaging; residential construction mixed Operating Performance  Higher productivity sequentially  Operating margin up 220 bps sequentially to 13.4%  YoY unfavorable volume leverage CONSUMER & SPECIALTIES SEGMENT Financial Performance Sales Operating Income Second Quarter Summary  Market penetration and geographic expansion drives Household & Personal Care higher  Similar sales in Specialty Additives Third Quarter Outlook $284M $268M $278M Q2 ’24 Q1 ’25 Q2 ’25 +4% $44M $30M $37M Q2 ’24 Q1 ’25 Q2 ’25 +24% Operating income and operating margin exclude special items

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9 ENGINEERED SOLUTIONS SEGMENT Financial Performance Sales Operating Income Sales Performance  Global foundry sales similar YoY and up 5% sequentially - End market demand remains steady  Strong N. America steel sales; Europe remains soft  Environmental & Infrastructure sales up 1% YoY and up 35% sequentially Operating Performance  Strong operating margin at 17.4% of sales, up 200 basis points sequentially Second Quarter Summary  Stable market demand in High-Temperature Technologies - Seasonal maintenance outages in Q3 for foundry  Similar project activity levels in Environmental & Infrastructure Third Quarter Outlook $257M $224M $251M Q2 ’24 Q1 ’25 Q2 ’25 +12% $45M $34M $44M Q2 ’24 Q1 ’25 Q2 ’25 +27% Operating income and operating margin exclude special items

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10 Balance Sheet and Capital Deployment Cash Flow and Capital Deployment Q2 ’25Q2 ’24 $320M$316MCash, Cash Equivalents, and Short-Term Investments $374M$222MAvailable Revolver $694M$538MTotal Liquidity Liquidity 1.7X EBITDA Net Leverage Ratio Debt and Leverage $675M $663M Q2 ’24 Q2 ’25 -2% Net Debt EBITDA excludes special items Q2 ‘25Q2 ‘24 $63M$50MCash from Operations $29M$20MCapital Expenditures $34M$30MFree Cash Flow Second Quarter 2025 $22MDividends & Share Repurchases

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11  Modest increase in Consumer & Specialties sales sequentially - Growth initiatives drive a sequential increase in Household & Personal Care - Similar sales in Specialty Additives  Engineered Solutions sales similar sequentially  Uncertainty around tariff policies and potential end market impacts  Stronger second half vs. first half for sales, operating income, and cash flow Third Quarter Outlook $525M-$535M Sales ~$75M Operating Income ~$1.45 EPS

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Douglas T. Dietrich Chairman and Chief Executive Officer

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13 17th Annual Sustainability Report Delivered world-class safety performance Achieved 11 of 12 environmental targets ahead of schedule Deep engagement with our communities around the world 66% of new products have a sustainable profile Visit mineralstech.com/sustainability to download a copy

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16 Reconciliation Net Income and Diluted EPS Excluding Special Items The information set forth in the Analyst Presentation presents financial measures of the Company that exclude certain special items, and are therefore not in accordance with GAAP. The following is a presentation of the Company’s non-GAAP net income, operating income and EBITDA, excluding special items, and free cash flow for the quarterly periods ended June 29, 2025, March 30, 2025 and June 30, 2024 and the six month periods ended June 29, 2025 and June 30, 2024 and a reconciliation to GAAP net income (loss), operating income (loss) and EBITDA, and cash flow from operations, respectively, for such periods. The Company’s management believes these non-GAAP measures provide meaningful supplemental information regarding its performance as inclusion of such special items are not indicative of the ongoing operating results and thereby affect the comparability of results between periods. The Company feels inclusion of these non-GAAP measures also provides consistency in its financial reporting and facilitates investors’ understanding of historic operating trends. Six Months EndedQuarter Ended(millions of dollars, except per share data) Jun. 30,Jun. 29,Jun. 30,Mar. 30,Jun. 29, 20242025202420252025 66.4 $(98.6)$19.7 $(144.0)$45.4 $Net income (loss) attributable to MTI 6.2%*3.6%*8.6%% of sales Special items: 30.0 215.0 30.0 215.0 0.0 Provision for litigation reserve and credit losses 0.0 11.3 0.0 5.5 5.8 Restructuring and other items 0.0 (5.6)0.0 0.0 (5.6)Gain on sale of assets, net 6.3 7.0 4.2 2.8 4.2 Litigation expenses (0.8)(43.8)(0.3)(42.9)(0.9)Related tax effects on special items 101.985.353.636.448.9Net income attributable to MTI, excluding special items 9.5%$8.4%$9.9%$7.4%$9.2%$% of sales 3.15 $2.69$1.65 $1.14 $1.55 $Diluted earnings per share, excluding special items * Percentage not meaningful

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17 Reconciliation Segment Operating Income Excluding Special Items Six Months EndedQuarter Ended(millions of dollars) Jun. 30,Jun. 29,Jun. 30,Mar. 30,Jun. 29, 20242025202420252025 Segment Operating Income (Loss) 85.9 $61.5 $43.9 $27.5 $34.0 $Consumer & Specialties Segment 83.2 80.4 44.7 33.6 46.8 Engineered Solutions Segment (43.3)(227.4)(38.0)(221.2)(6.2)Unallocated Corporate Expenses 125.8 $(85.5)$50.6 $(160.1)$74.6 $MTI Consolidated Special Items 0.0 $5.8 $0.0 $2.5 $3.3 $Consumer & Specialties Segment 0.0 (2.3)0.0 0.8 (3.1)Engineered Solutions Segment 36.3 224.2 34.2 220.0 4.2 Unallocated Corporate Expenses 36.3 $227.7 $34.2 $223.3 $4.4 $MTI Consolidated Segment Operating Income, Excluding Special Items 85.9 $67.3 $43.9 $30.0 $37.3 $Consumer & Specialties Segment 83.2 78.1 44.7 34.4 43.7 Engineered Solutions Segment (7.0)(3.2)(3.8)(1.2)(2.0)Unallocated Corporate Expenses 162.1 $142.2 $84.8 $63.2 $79.0 $MTI Consolidated 15.1%13.9%15.7%12.9%14.9%% of Sales

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18 Reconciliation Adjusted EBITDA Excluding Special Items Six Months EndedQuarter Ended(millions of dollars) Jun. 30,Jun. 29,Jun. 30,Mar. 30,Jun. 29, 20242025202420252025 66.4 $(98.6)$19.7 $(144.0)$45.4 $Net income (loss) attributable to MTI Add back: 47.5 45.5 24.0 23.522.0 Depreciation, depletion and amortization expense 29.8 27.8 14.9 14.213.6 Interest expense, net (3.3)(2.3)(1.9)(1.2)(1.1)Equity in earnings of affiliates, net of tax 2.1 1.9 1.2 1.00.9 Net income attributable to non-controlling interests 29.5 (18.2)15.6 (32.1)13.9 Provision (benefit) for taxes on income 172.0 (43.9)73.5 (138.6)94.7 EBITDA Add special items: 30.0215.030.0215.00.0Provision for litigation reserve and credit losses 0.011.30.05.55.8Restructuring and other items 0.0(5.6)0.00.0(5.6)Gain on sale of assets, net 6.37.0$4.22.84.2Litigation expenses 208.3$183.8107.7$84.7$99.1 $Adjusted EBITDA 19.4%18.0%19.9%17.2%18.7%% of sales

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19 Reconciliation Free Cash Flow Six Months EndedQuarter Ended(millions of dollars) Jun. 30,Jun. 29,Jun. 30,Mar. 30,Jun. 29, 20242025202420252025 106.0 $58.5 $50.1 $(4.4)$62.9 $Cash flow from operations 36.7 47.4 20.2 18.329.1 Capital expenditures 69.3 $11.1 $29.9 $(22.7)$33.8 $Free cash flow

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