Pro Forma Financial Information The Company acquired Avient Protective Materials (“Dyneema”) on September 1, 2022 (the “Acquisition Date”) and sold the Distribution segment on November 1, 2022. EBITDA Margins (1) 5.4% 11.5% 16.2% 2006 2018 2022PF $142 $408 $592 2006 2018 2022PF 2006 figures exclude joint venture results 2022 pro forma for the acquisition of Avient Protective Materials Adj. Three Months Ended December 31, 2022 2021 Reconciliation to Condensed Consolidated Statements of Income $ EPS(1) $ EPS(1) Net (loss) income from continuing operations attributable to Avient shareholders $ (17.0) $ (0.19) $ 11.2 $ 0.12 Special items, after tax (Attachment 3) 38.3 0.42 23.9 0.26 Amortization expense, after-tax 14.6 0.16 11.3 0.12 Adjusted net income / EPS $ 35.9 $ 0.39 $ 46.4 $ 0.50 Year Ended December 31, 2022 2021 Reconciliation to Condensed Consolidated Statements of Income $ EPS(1) $ EPS(1) Net income from continuing operations attributable to Avient shareholders $ 82.8 $ 0.90 $ 151.8 $ 1.65 Special items, after tax (Attachment 3) 116.2 1.26 50.0 0.54 Amortization expense, after-tax 49.0 0.53 44.9 0.49 Adjusted net income / EPS $ 248.0 $ 2.69 $ 246.7 $ 2.68 (1) Per share amounts may not recalculate from figures presented herein due to rounding 1 Three Months Ended December 31, Year Ended December 31, Reconciliation to EBITDA and Adjusted EBITDA 2022 2021 2022 2021 Net (loss) income from continuing operations – GAAP $ (16.6) $ 10.3 $ 83.1 $ 151.6 Income tax (benefit) expense (60.8) 17.1 (19.3) 51.9 Interest expense 49.4 17.5 119.8 75.2 Depreciation and amortization from continuing operations 48.6 38.0 162.5 145.1 EBITDA $ 20.6 $ 82.9 $ 346.1 $ 423.8 Special items, before income tax 104.3 20.5 194.0 57.1 Interest expense included in special items (16.0) — (26.0) — Depreciation and amortization included in special items (1.5) (1.6) (5.5) (1.7) APM pro forma adjustments - 2021 — 30.4 — 120.5 APM pro forma adjustments - 8 months 2022* — — 83.1 — Adjusted EBITDA $ 107.4 $ 132.2 $ 591.7 $ 599.7 * Pro forma adjustment for January - August 2022 APM results (period before Avient ownership).

Runners 1. Venting 1. Draft Angle 1.

On December 1, 2023, Mr. Kunkle — 4,022(1) 321,750(1) 643,500(1) — — — — — — 28,875(2) 231,000(2) 462,000(2) — — — — — 2/17/2023 — — — 7,083(3) 21,250(3) — 42.93 269,117 11/1/2023 — — — (4) (4) — 42.93 95,223 11/1/2023 — — — (4) (4) — 52.64 27,135 11/1/2023 — — — (4) (4) — 42.27 5,130 2/17/2023 — — — — — 6,300(6) — 270,459 11/1/2023 — — — — — (7) — 151,675 11/1/2023 — — — — — (7) — 69,605 11/1/2023 — — — — — (7) — 15,354 R.M. Patterson was our First PEO from January 1 - December 1.

Avient acquired the Clariant Color business on July 1, 2020 (the “Acquisition Date”). We are Avient. 6 BETTER TOGETHER: POLYONE AND CLARIANT COLOR Key Financial Data 2021 Sales $4.8 billion 2021 EBITDA $581 million 87% of EBITDA from specialty applications 2021 PE RF O RM AN CE $80 $85 2020 2021 $0.52 $0.58 2020 2021 Q4 2021 PERFORMANCE (TOTAL COMPANY) 8 Sales Adjusted Operating Income $997 $1,202 2020 2021 + 21% Adjusted EPS + 6% + 12% (in millions) (in millions) $308 $429 2020PF 2021 $1.93 $3.05 2020PF 2021 FULL YEAR 2021 PERFORMANCE (TOTAL COMPANY) 9 Sales Adjusted Operating Income $3,783 $4,819 2020PF 2021 + 27% Adjusted EPS + 39% + 58% (in millions) (in millions) (1) Financial information is pro forma to include a full year of Clariant Color business (1) (1) (1) FULL YEAR 2021 SEGMENT PERFORMANCE 10 CAI $2,043 $2,402 Sales ($ in millions) SEM Distribution $226 $303 Operating Income + 18% + 34% $1,110 $1,631 Sales $70 $93 Operating Income + 47% + 33% (1) $709 $919 Sales $94 $132 Operating Income + 30% + 40% (1) Financial information is pro forma to include a full year of Clariant Color business (1) Full Year 2020 (Pro forma) $3,783 $308 Sustainable Solutions 147 19% 60 Healthcare 143 28% 30 Composites 58 43% 29 Growth in Asia / LATAM 107 21% 26 Other 543 30% 58 Sub-total $4,781 26% $511 Wage Inflation and Overtime (39) Other Supply Chain Costs (15) COVID Response Applications (22) (12) Synergies 44 FX, Incentives, Other Employee Costs 60 (60) Full Year 2021 $4,819 27% $429 FULL YEAR 2021 SALES AND OPERATING INCOME (TOTAL COMPANY) 11 Sales Growth Rate Adjusted Operating Income$ millions (1) Financial information is pro forma to include a full year of Clariant Color business (1) Adjusted EBITDA 12 Full Year 2020 (Pro forma) $ 457 Demand 135 $ millions CAI: Price / Mix 158 Inflation (120) SEM: Price / Mix 84 Inflation (65) Distribution: Price / Mix 318 Inflation (304) Net Price Benefit 71 Wage Inflation and Overtime (39) Other Supply Chain Costs (15) COVID Response Applications (12) Synergies 44 Incentives, FX, Other Employee Costs (60) Full Year 2021 $ 581    (1) Financial information is pro forma to include a full year of Clariant Color business (1) • Demand impact driven by growth in key focus areas: sustainable solutions, healthcare, composites and growth in Asia / LATAM • Price increases more than offset raw material and supply chain impacts FULL YEAR 2021 EBITDA BRIDGE SPECIALTY EBITDA MARGIN EXPANSION 13 CAI (1) 2018-2020 financial information is pro forma to include a full year of Clariant Color business 15.3% 15.2% 16.2% 17.0% 2018 2019 2020 2021 14.8% 15.2% 17.6% 17.8% 2018 2019 2020 2021 (1) SEM • Record margins in 2021 despite unprecedented supply chain challenges • Continued portfolio transformation to high-growth end markets and sustainable solutions • Clariant Color synergy realization • Investments in composites and outdoor high performance applications drove growth and mix improvements • Acquisition of Clariant Color business significantly expanded presence in healthcare, packaging and consumer end markets • Strength of portfolio – double-digit annual EBITDA growth since acquisition • $54 million of synergies realized in 2021 • Acquisition completed on July 1, 2020 for $1.45 billion. OUR VALUATION VERSUS PEERS Avient Specialty Formulators Other Chemical/Specialty Companies 5.4 8.5 10.1 10.0 15.7 15.0 14.2 12.7 10.2 25.0 19.7 17.7 13.2 12.3 10.0 9.9 8.9 8.5 8.3 6.6 A vi en t (2 01 1) A vi en t (2 01 6) A vi en t (2 02 1) A vi en t (T o da y) R P M K W R P P G A V Y F U L A L B E C L H X L A S H F M C B N R E M N U N V R C E S C L H U N Historic Multiple SUMMARY: WHY INVEST IN AVIENT?

TPEE AND TPU FILM MANUFACTURER H O T M E L T A D H E S I V E F I L M • Anti-phenol yellowing after storage • Keep natural color of product • No impact on melt flow ability • Prevented the appearance quality from yellowing after storage • Had no negative impact on the product’s mechanical properties • Extended the shelf life and durability of the product CesaTM Anti-phenolic Yellowing Additive KEY REQUIREMENTS WHY AVIENT AVIENT SOLUTION FUNCTIONALITY + CONVENIENCE LEARN MORE Avient Corporation 1 https://www.avient.com/products/polymer-additives Slide 1: TPEE and TPU Film MANUFACTURER

No. 0514.01) 12/11/2023 Page 1 of 1 SCOPE OF ACCREDITATION TO ISO/IEC 17025:2017 AVIENT CORPORATION – ANALYTICAL SOLUTIONS 33587 Walker Road Avon Lake, OH 44012 Stephanie Mims Phone: 440 930 3499 MECHANICAL Valid To: September 30, 2025 Certificate Number: 0514.01 In recognition of the successful completion of the A2LA evaluation process, accreditation is granted to this laboratory to perform the following rubber and plastics tests: Test Description Test Method or Standard Brittleness Temperature (Impact) ASTM D746; ISO 812 Charpy Impact ISO 179-1 Color Determination by Spectrophotometer ASTM D2244, E1331; ISO 7724 Conditioning of Plastics for Testing ASTM D618; ISO 291 Deflection Temperature Under Flexural Load ASTM D648; ISO 75-1, -2 Durometer Hardness (Shore A and D) ASTM D2240; ISO 7619-1 Flexural Properties ASTM D790; ISO 178 Flow Rate (Extrusion Plastometer) ASTM D1238 (Procedures A and B); ISO 1133 Impact Resistance (Izod) ASTM D256; ISO 180 Instrumented Impact ASTM D3763; ISO 6603-2 Specific Gravity/Density ASTM D792 (Method A); ISO 1183-1 Specular Gloss ASTM D523; ISO 2813 Tackiness of Interior Materials BO 061-01 Tear Resistance ASTM D624, D1004; ISO 34 Tensile Properties ASTM D412 (Method A), D638, D882; ISO 37, 527-1, -2, -3, -4, -5 Xenon-Arc Exposure Testing ASTM D2565, G155; SAE J1885 (Withdrawn January 2008), J1960 (Withdrawn January 2008), J2412, J2527; BO-116-01 For the tests to which this accreditation applies, please refer to the laboratory’s Mechanical Scope of Accreditation.

Pro Forma Financial Information The Company acquired Avient Protective Materials (“Dyneema”) on September 1, 2022 (the “Acquisition Date”) and sold the Distribution segment on November 1, 2022. To provide comparable results, the company references “pro forma” financial metrics, which include the business results of Avient Protective Materials for periods prior to the Acquisition Date, as if the transaction occurred on January 1, 2021 and reflect Distribution as a discontinued operation. GUIDANCE (TOTAL COMPANY) 11 14.8% 15.8% Guidance Actual Adjusted EBITDA Margin % Better-than-expected margins driven by: • Resilient demand for composites and sustainable solutions which improved mix of higher margin applications • Deceleration of raw material inflation • Cost reduction activities Q1 EBITDA BRIDGE (TOTAL COMPANY) 12 $ millions CAI: Price / Mix 19) Inflation (4) SEM: Price / Mix 6) Inflation (4) Net Price Benefit 17) Wage and Energy Inflation (13) Cost Reductions 8) FX (6) Q1 2023 Actual $134) Adjusted EBITDA Q1 2022 Pro Forma $ 176) Demand (48) • Weak demand conditions in-line with previous expectations • Pricing continues to cover inflation of raw materials, wages and energy U.S. & Canada 40% EMEA 38% Asia 17% Latin America 5% Q1 2023 SEGMENT, END MARKET AND GEOGRAPHY GEOGRAPHY REVENUESEGMENT FINANCIALS Consumer 18% Packaging 23% Healthcare 7% Industrial 16% Building and Construction 10% Defense 6%Telecommunications 4% Energy 5% END MARKET REVENUE (1) Total company sales and adjusted EBITDA of $846M and $134M, respectively, include intercompany sales eliminations and corporate costs $537M $91M $310M $64M Sales EBITDA Specialty Engineered Materials Color Additives and Inks $134M$846M (1) 13 Transportation 11% Q1 2023 SALES BY REGION Yo Y C H A N G E ( E X C L .

Pro Forma Financial Information The Company acquired Avient Protective Materials (“Dyneema”) on September 1, 2022 (the “Acquisition Date”) and sold the Distribution segment on November 1, 2022. To provide comparable results, the company references “pro forma” financial metrics, which include the business results of Avient Protective Materials for periods prior to the Acquisition Date, as if the transaction occurred on January 1, 2021 and reflect Distribution as a discontinued operation. GUIDANCE (TOTAL COMPANY) 7 14.8% 15.8% Guidance Actual Adjusted EBITDA Margin % Better-than-expected margins driven by: • Resilient demand for composites and sustainable solutions which improved mix of higher margin applications • Deceleration of raw material inflation • Cost reduction activities Q1 EBITDA BRIDGE (TOTAL COMPANY) 8 $ millions CAI: Price / Mix 19) Inflation (4) SEM: Price / Mix 6) Inflation (4) Net Price Benefit 17) Wage and Energy Inflation (13) Cost Reductions 8) FX (6) Q1 2023 Actual $134) Adjusted EBITDA Q1 2022 Pro Forma $ 176) Demand (48) • Weak demand conditions in-line with previous expectations • Pricing continues to cover inflation of raw materials, wages and energy U.S. & Canada 40% EMEA 38% Asia 17% Latin America 5% Q1 2023 SEGMENT, END MARKET AND GEOGRAPHY GEOGRAPHY REVENUESEGMENT FINANCIALS Consumer 18% Packaging 23% Healthcare 7% Industrial 16% Building and Construction 10% Defense 6%Telecommunications 4% Energy 5% END MARKET REVENUE (1) Total company sales and adjusted EBITDA of $846M and $134M, respectively, include intercompany sales eliminations and corporate costs $537M $91M $310M $64M Sales EBITDA Specialty Engineered Materials Color Additives and Inks $134M$846M (1) 9 Transportation 11% Q1 2023 SALES BY REGION Yo Y C H A N G E ( E X C L .

Pro Forma Financial Information The Company acquired Avient Protective Materials (“Dyneema”) on September 1, 2022 (the “Acquisition Date”) and sold the Distribution segment on November 1, 2022. To provide comparable results, the company references “pro forma” financial metrics, which include the business results of Avient Protective Materials for periods prior to the Acquisition Date, as if the transaction occurred on January 1, 2021 and reflect Distribution as a discontinued operation. Avient 2011, 2018 and 2021 multiples reflect trailing 12 months EBITDA at December 31. 28 EV / 2023E EBITDA 6.5 8.5 11.0 10.8 16.1 15.5 14.1 14.0 10.3 21.0 19.0 14.3 12.1 11.8 11.7 11.5 9.7 20 11 20 18 20 21 20 23 R PM AV Y PP G KW R FU L EC L H XL SC L C E FM C AS H H U N EM N Avient Historic Multiple Avient Specialty Formulators Other Specialty / Chemical Companies AP P E N DI X 30 Performance Additives 16% Pigments 12% TiO2 10% Dyestuffs 2% Polyethylene 11% Nylon 6% Polypropylene 5% Styrenic Block Copolymer 5% Other Raw Materials 33% ~40% hydrocarbon based (Grey shaded materials are hydrocarbon based, includes portion of “Other Raw Materials”) Non-hydrocarbon based materials 2022 pro forma results for the acquisition of Avient Protective Materials RAW MATERIAL BASKET SEGMENT DATA U.S. & Canada 40% EMEA 37% Asia 18% Latin America 5% 2022 PRO FORMA SEGMENT, END MARKET AND GEOGRAPHY GEOGRAPHY REVENUESEGMENT FINANCIALS Consumer 20% Packaging 24% Industrial 15% Building and Construction 10% Telecommunications 4% Energy 4% Defense 6% END MARKET REVENUE $2,355M $402M $1,300M $272M Sales EBITDA Specialty Engineered Materials Color Additives and Inks $592M$3,653M (1) Transportation 9% Healthcare 8% 32 (1) Total company sales and adjusted EBITDA of $3,653M and $592M, respectively, include intercompany sales eliminations and corporate costs 2022 REVENUE | $2 .4 BILLION US & Canada 34% EMEA 38% Asia 20% Latin America 8% END MARKET REGION 33 Packaging 34% Consumer 21% Healthcare 8% Industrial 15% Transportation 8% Building & Construction 11% Telecommunications 1% Energy 2% COLOR, ADDITIVES & INKS 2022 PRO FORMA REVENUE | $1 .3 BILLION US & Canada 52% EMEA 35% Asia 13% 34 Packaging 5% Consumer 19% Healthcare 8%Industrial 16% Transportation 10% Telecommunications 10% Energy 9% Defense 15% Building & Construction 8% END MARKET REGION SPECIALTY ENGINEERED MATERIALS Packaging 32% Consumer 27% Healthcare 8% Industrial 14% Building & Construction 5% Telecommunications 3% Energy 1% Defense 1% Asia (18% of sales) Transportation 9% 2022 PROFORMA AVIENT REGIONAL SALES Packaging 27% Consumer 14% Healthcare 5% Industrial 17% Building & Construction 10% Energy 5% Defense 8% EMEA (37% of sales)Transportation 11% Packaging 13% Consumer 24% Healthcare 12% Industrial 15% Building & Construction 13% Energy 5% Defense 5% US & Canada (40% of sales) Transportation 7% Packaging 56% Consumer 23% Healthcare 4% Industrial 7% Building & Construction 4% Telecommunications 1% LATAM (5% of sales) Transportation 5% Telecommunications 3% Telecommunications 6% 35 BY END MARKET Reconciliation of Non-GAAP Financial Measures (Unaudited) (Dollars in millions, except for per share data) Senior management uses comparisons of adjusted net income from continuing operations attributable to Avient shareholders and diluted adjusted earnings per share (EPS) from continuing operations attributable to Avient shareholders, excluding special items, to assess performance and facilitate comparability of results.

The company noted that third quarter 2024 GAAP EPS includes $0.07 of special items (see Attachment 3) and $0.16 of intangible amortization expense (see Attachment 1). You are advised to consult any further disclosures we make on related subjects in our reports on Form 10-Q, 8-K and 10-K that we provide to the Securities and Exchange Commission. 5 Investor Relations Contact: Giuseppe (Joe) Di Salvo Vice President, Treasurer and Investor Relations Avient Corporation +1 440-930-1921 giuseppe.disalvo@avient.com Media Contact: Kyle G. Rose Vice President, Corporate Communications Avient Corporation +1 440-930-3162 kyle.rose@avient.com 6 Attachment 1 Avient Corporation Summary of Condensed Consolidated Statements of Income (Unaudited) (In millions, except per share data) Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Sales $ 815.2 $ 753.7 $ 2,493.9 $ 2,423.8 Operating income 77.2 34.3 243.7 153.7 Net income from continuing operations attributable to Avient shareholders 38.2 5.1 121.2 48.0 Diluted earnings per share from continuing operations attributable to Avient shareholders $ 0.41 $ 0.06 $ 1.32 $ 0.52 Senior management uses comparisons of adjusted net income from continuing operations attributable to Avient shareholders and diluted adjusted earnings per share (EPS) from continuing operations attributable to Avient shareholders, excluding special items, to assess performance and facilitate comparability of results.