MSC Certificate Place and date: For the issuing office: Shanghai, 12 June 2024 DNV - Business Assurance Building 9, No. 1591 Hongqiao Road, Changning DistrictShanghai China 200336 Zhu Hai Ming Management Representative Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid.

RTF Template Place and date: For the issuing office: Shanghai, 19 March, 2021 DNV GL - Business Assurance Suite A, Building 9, No.1591 Hongqiao Road, Changning District, Shanghai 200336, P.R.

MATERIAL DESCRIPTION BASE RESIN Trilliant™ HC2020 Copolyester Trilliant™ HC8910/8920 Polyketone/ABS blend Trilliant™ HC2120 Tritan Trilliant™ HC3120 PC Trilliant™ HC5210 PP Trilliant™ HC6010 PA6 Trilliant™ HC6610 PA66 Trilliant™ GRV-NP-110-W PA12 TRILLIANT™ HC THERMOPLASTICS • Chemically resistant replacement for FR PC/ABS, FR PC/PET & FR COPE, providing UL 94 Yellow Card V-0 flame rating at 1.5 mm, V-1 at 0.75 mm thicknesses for a broad color spectrum • Outperforms PC/ABS, PC/PET and COPE in resistance to common disinfectants • Retains tensile strength after 72-hour exposure to common hospital disinfectants, and shows better long-term chemical resistance as compared to PC blends and COPE • Exhibits good impact and temperature resistance • Available in natural grades, standard medical colors, or custom pre-colored products • Medical device housings • MRI, X-ray, CT scanner components • Surgical instruments such as staplers, dissectors, scissors • Auto-injector pen TRILLIANT™ HC ELECTRICALLY CONDUCTIVE FORMULATIONS • Consistent conductivity ensures repeatable part performance and minimizes failures related to inconsistent electrical conductivity • High flow and easy processing facilitate filling of thin wall parts and multiple cavity tools, which enable faster cycle times and lower per-unit part costs • Superior durability reduces breakage and resultant scrap related costs • Less tendency to flash results in improved appearance and less fluid retention in or on the tip, thus driving greater accuracy and less potential for cross-contamination • High strength produces parts with greater stiffness and warp resistance, again minimizing scrap-related costs • Conductive pipette tips TEST TEMS SPECIFIC GRAVITY MELT FLOW RATE (230OC, 2.16KG) TENSILE FLEXURAL FLEXURAL MODULUS IMPACT STRENGTH NOTCHED, IZOD SURFACE RESISTIVITY Method ASTM D-792 ASTM D-1238 ASTM D-638 ASTM D-790 ASTM D-790 ASTM D-256 ASTM D-257 Unit -- g/10min MPa MPa MPa J/m Ohms/sq.

ColorWorks innovation centers are specially designed to foster imagination and enable creative exploration of innovative solutions • Focus on customers’ sustainability initiatives through recyclability and post-consumer recycled materials for packaging applications • Supports 8-12% long-term revenue growth expectations across our sustainable solutions portfolio 8 2020 Pro forma $870 $69 Sustainable Solutions 66 37% 26 Healthcare 29 20% 7 Composites 12 36% 6 Growth in Asia / LATAM 47 39% 11 Other 190 48% 22 Sub-total $1,214 40% $141 COVID Response Applications (15) (8) FX Impact 36 4 Synergies 11 Incentives, Travel, Other Employee Costs (26) 2021 Actual $1,235 42% $122 Q2 2021 ORGANIC SALES AND OPERATING INCOME 9 (1) Financial information is pro forma to include a full year of Clariant Masterbatch business acquisition Sales Growth Rate Operating Income$ millions 10 Q2 2020PF Q2 2021 (2) Financial information is presented on a constant currency basis (1,2) (44% of total revenue) (56% of total revenue) Q2 END MARKET SALES PERFORMANCE +26% +38% +46% +103% +51% +9% +7% +67% Energy Telecom Building & Transportation Industrial Healthcare Packaging Consumer Q2 YEAR-OVER-YEAR EBITDA BRIDGE Q2 2020 Pro forma $ 106 Demand 69 11 EBITDA$ millions • Demand impact driven by growth in sustainable solutions and consumer products • Price increases more than offset raw material and supply chain impacts (1) Financial information is pro forma to include a full year of Clariant Masterbatch business acquisition CAI: Price / Mix 40 Inflation (32) SEM: Price / Mix 23 Inflation (18) Distribution: Price / Mix 81 Inflation (77) Net Price Benefit 17 Supply Chain Disruptions (14) COVID Response Applications (8) Synergies 11 Incentives, Travel, FX, Other (22) Q2 2021 Actual $ 159 Q1 2021 Actual $ 161 CAI: Price / Mix 32 Inflation (22) SEM: Price / Mix 15 Inflation (9) Distribution: Price / Mix 50 Inflation (48) Net Price Benefit 18 Supply Chain Disruptions (12) Demand / Seasonality (6) Other (2) Q2 2021 Actual $ 15912 EBITDA$ millions • Price increases more than offset raw material and freight inflation impacts • Demand impact driven by Q2 seasonality for the business Q1 TO Q2 SEQUENTIAL EBITDA BRIDGE Q 3 AN D FU LL Y EA R 2021 O U TLO O K $74 $98 $0.46 $0.68 ORGANIC GROWTH PROJECTIONS – Q3 14 Sales Adjusted Operating Income $925 $1,150 + 24% + 32% + 48% FULL YEAR GUIDANCE INCREASED 15 Sales Adj. Develop and implement solutions to end plastic waste while supporting AEPW $1.5B investment in key initiatives. 2030 SUSTAINABILITY TARGETS 20 2021 AVIENT INVESTOR DAY 21 • Investor Day to be held December 9, 2021 in New York, NY • Company will provide updates on its key growth drivers with a deep focus on sustainable solutions Revenue Growth Drivers Long-Term Growth Rate Sustainable Solutions 8–12% Healthcare 8–10% Composites / 5G 10% Growth in Asia / LATAM 5% Other (GDP growth) 2–3% Avient 6.5% • Senior leadership team to also present on Clariant MB integration, M&A opportunities and capital allocation priorities PEER COMPARISONS 22 As a specialty formulator, we don’t require significant capital investment, as compared to the base resin raw material suppliers we purchase from. APPENDIX Performance Additives Pigments TiO2 Dyestuffs 4%Polyethylene Nylon Polypropylene Other Raw Materials 29% Styrenic Block Copolymer ~1/3 hydrocarbon based (Grey shaded materials are hydrocarbon based, includes portion of “Other Raw Materials”) Non-hydrocarbon based materials 28 • In Q2 2021, several raw material markets experienced significant price inflation and tight inventory o Average cost of hydrocarbon based materials was up 45% year-over-year and 20% sequentially o Average cost of non-hydrocarbon based materials was up 10% year-over-year and 8% sequentially • Additionally, we experienced other supply chain challenges during Q2 related to raw material spot purchases, freight constraints and productivity loss as a result of these shortages Annual Purchases RAW MATERIAL AND SUPPLY CHAIN UPDATE Based on 2020 pro forma purchases, excludes Distribution business SEGMENT DATA U.S. & Canada 50% 26% Latin America 2021 YTD SEGMENT, END MARKET AND GEOGRAPHY 30 GEOGRAPHY REVENUESEGMENT FINANCIALS 23% Building and 9% END MARKET REVENUE (1) Total company sales and EBITDA of $2,398M and $320M, respectively, include intercompany sales eliminations and corporate costs All charts reflect YTD financials through June 30 $1,234M $228M $457M $87M $767M $48M Sales EBITDA Distribution Specialty Engineered Materials Color Additives and Inks $320M$2,398M 14% 34% 21% Building & 9% 2% Telecommunications C O L O R , A D D I T I V E S & I N K S 2021 YTD REVENUE | $1 .2 BILL ION 31% 42% 21% Latin America END MARKET REGION 31 S P E C I A LT Y E N G I N E E R E D M AT E R I A L S 28% Building & 2021 YTD REVENUE | $457 MILLION END MARKET 54% 26% REGION 32 DI S TR IBU T I ON 27% 22% Building and 81% Latin America END MARKET REGION K E Y S U P P L I ER S 2021 YTD REVENUE | $767 MILLION 33 TOTA L C O M PA N Y R E G I O N A L S A L E S BY END MARKET 30% 27%Healthcare Building & 2% Energy (16% of sales) 32% 13% 18% Building & (26% of sales) 34 25% 19% Building & US & Canada (50% of sales) 13% 40% 33% Building & LATAM (8% of sales) Reconciliation of Non-GAAP Financial Measures (Unaudited) (Dollars in millions, except for per share data) June 30, 2021 Reconciliation to Condensed Consolidated Statements of Income GAAP Special Adjusted Operating income $ 108.1 $ 14.2 $ 122.3 Income from continuing operations before income taxes $ 89.8 $ 14.2 $ 104.0 Income tax expense - GAAP (20.4) — (20.4) Income tax impact of special items — (3.4) (3.4) Tax adjustments — 0.9 0.9 Net income attributable to noncontrolling interests (0.6) — (0.6) Net income from continuing operations attributable to Avient shareholders $ 68.8 $ 11.7 $ 80.5 Net income / EPS $ 0.74 $ 0.13 $ 0.87 Weighted-average diluted shares 92.4 92.4 92.4 September 30, 2020 Reconciliation to Condensed Consolidated Statements of Income GAAP Special Adjusted Operating income $ 33.5 $ 40.4 $ 73.9 Income from continuing operations before income taxes $ 5.3 $ 50.0 $ 55.3 Income tax expense - GAAP (2.7) — (2.7) Income tax impact of special items — (12.7) (12.7) Tax adjustments — 3.0 3.0 Net income attributable to noncontrolling interests (0.9) — (0.9) Net income from continuing operations attributable to Avient shareholders $ 1.7 $ 40.3 $ 42.0 Net income / EPS $ 0.02 $ 0.44 $ 0.46 Weighted-average diluted shares 91.9 91.9 91.9 Three Months Ended Year Ended December 31, Reconciliation to Pro Forma Adjusted EBITDA 2021 March 31, 2021 June 30, 2020 2020 2019 Net income from continuing operations – GAAP $ 69.4 $ 79.7 $ 23.4 $ 133.8 $ 75.7 Income tax expense 20.4 22.9 7.9 5.2 33.7 Interest expense 19.5 19.3 16.2 74.6 59.5 Depreciation and amortization from continuing operations 33.8 37.1 20.9 115.0 78.1 EBITDA $ 143.1 $ 159.0 $ 68.4 $ 328.6 $ 247.0 Special items, before tax 14.2 2.4 2.4 66.2 61.7 Interest expense included in special items — — (0.5) (10.1) — Depreciation and amortization included in special items 1.4 (0.5) (1.2) (3.2) — Adjusted EBITDA $ 158.7 $ 160.9 $ 69.1 $ 381.6 $ 308.7 Clariant MB pro forma adjustments(1) — — 37.0 75.1 133.2 Pro forma adjusted EBITDA $ 158.7 $ 160.9 $ 106.1 $ 456.7 $ 441.9 (1) Pro forma adjustments for the periods prior to the acquisition date (July 1, 2020) and to give effects to the financing for the acquisition 1 Reconciliation of EBITDA by Segment Six Months Ended December 31, 2021 2020 2021 2020 2019 2018 Sales: Color, Additives and Inks $ 624.4 $ 226.8 $ 1,233.7 $ 483.3 $ 1,502.9 $ 1,003.8 Specialty Engineered Materials 240.6 158.8 457.1 344.1 708.8 745.7 Distribution 404.4 238.8 767.1 528.3 1,110.3 1,192.2 Corporate and eliminations (34.2) (15.3) (60.4) (35.1) (79.9) (79.0) Sales $ 1,235.2 $ 609.1 $ 2,397.5 $ 1,320.6 $ 3,242.1 $ 2,862.7 Operating income: Color, Additives and Inks $ 86.3 $ 32.3 $ 175.1 $ 180.8 $ 147.4 $ 158.5 Specialty Engineered Materials 37.3 17.0 71.5 94.4 83.7 72.3 Distribution 23.7 14.6 47.7 69.5 75.4 71.5 Corporate and eliminations (39.2) (25.9) (65.8) (155.4) (149.7) (123.7) Operating income $ 108.1 $ 38.0 $ 228.5 $ 189.3 $ 156.8 $ 178.6 Items below OI in Corporate: Other income, net $ 1.2 $ 9.5 $ 2.7 $ 24.3 $ 12.1 $ (12.9) Depreciation & amortization: Color, Additives and Inks $ 25.3 $ 10.6 $ 52.6 $ 75.1 $ 42.7 $ 44.3 Specialty Engineered Materials 8.1 7.6 15.9 30.0 29.5 23.2 Distribution 0.2 0.1 0.4 0.7 0.5 0.7 Corporate and eliminations 0.2 2.6 2.0 9.2 5.4 4.4 Depreciation & Amortization $ 33.8 $ 20.9 $ 70.9 $ 115.0 $ 78.1 $ 72.6 EBITDA: Color, Additives and Inks $ 111.6 $ 42.9 $ 227.7 $ 255.9 $ 190.1 $ 202.8 Specialty Engineered Materials 45.4 24.6 87.4 124.4 113.2 95.5 Distribution 23.9 14.7 48.1 70.2 75.9 72.2 Corporate and eliminations (39.0) (23.3) (63.8) (146.2) (144.3) (119.3) EBITDA $ 143.1 $ 68.4 $ 302.1 $ 328.6 $ 247.0 $ 238.3 EBITDA as a % of Sales: Color, Additives and Inks 17.9 % 18.9 % 18.5 % 17.0 % 18.9 % 19.4 % Specialty Engineered Materials 18.9 % 15.5 % 19.1 % 17.6 % 15.2 % 14.8 % Distribution 5.9 % 6.2 % 6.3 % 6.3 % 6.4 % 5.7 % 2 Reconciliation of Pro Forma EBITDA - Color, Additives and Inks Three Months Ended June 30, Six Months Ended Year Ended December 31, 2021 2020 2021 2020 2019 2018 Sales: Color, Additives and Inks $ 624.4 $ 226.8 $ 1,233.7 $ 1,502.9 $ 1,003.8 $ 1,046.5 Clariant MB pro forma adjustments(1) — 261.1 — 540.4 1,118.6 1,209.8 Pro forma sales $ 624.4 $ 487.9 $ 1,233.7 $ 2,043.3 $ 2,122.4 $ 2,256.3 Operating income: Color, Additives and Inks $ 86.3 $ 32.3 $ 175.1 $ 180.8 $ 147.4 $ 158.5 Clariant MB pro forma adjustments(1) — 22.0 — 45.0 72.9 80.3 Pro forma operating income $ 86.3 $ 54.3 $ 175.1 $ 225.8 $ 220.3 $ 238.8 Depreciation & amortization: Color, Additives and Inks $ 25.3 $ 10.6 $ 52.6 $ 75.1 $ 42.7 $ 44.3 Clariant MB pro forma adjustments(1) — 15.0 — 30.1 60.3 61.2 Pro forma depreciation & amortization $ 25.3 $ 25.6 $ 52.6 $ 105.2 $ 103.0 $ 105.5 EBITDA Color, Additives and Inks $ 111.6 $ 42.9 $ 227.7 $ 255.9 $ 190.1 $ 202.8 Clariant MB pro forma adjustments(1) — 37.0 — 75.1 133.2 141.5 Pro forma EBITDA $ 111.6 $ 79.9 $ 227.7 $ 331.0 $ 323.3 $ 344.3 Pro forma EBITDA as a % of Sales 17.9 % 16.4 % 18.5 % 16.2 % 15.2 % 15.3 % Three Months Ended June 30, 2020 Reconciliation of Pro Forma Adjusted Earnings per Share Avient Special Adjusted Clariant MB Pro Forma Pro Forma Adjusted Sales $ 609.1 $ — $ 609.1 $ 261.1 $ 870.2 Operating income $ 38.0 $ 9.0 $ 47.0 $ 22.0 $ 69.0 Interest expense, net (16.2) — (16.2) (5.3) (21.5) Other income, net 9.5 (6.6) 2.9 — 2.9 Income taxes (7.9) 0.2 (7.7) (3.8) (11.5) Net income attributable to noncontrolling interests (0.4) — (0.4) — (0.4) Net income from continuing operations attributable to Avient shareholders $ 23.0 $ 2.6 $ 25.6 $ 12.9 $ 38.5 Weighted average diluted shares 91.8 Pro forma adjusted EPS $ 0.42 3 December 31, 2020 Reconciliation of Pro Forma Adjusted Earnings per Share Avient Special Adjusted Clariant MB Pro Forma Pro Forma Adjusted Sales $ 3,242.1 $ — $ 3,242.1 $ 540.4 $ 3,782.5 Operating income $ 189.3 $ 73.7 $ 263.0 $ 45.0 $ 308.0 Interest expense, net (74.6) 10.1 (64.5) (18.1) (82.6) Other income, net 24.3 (17.6) 6.7 — 6.7 Income taxes (5.2) (41.4) (46.6) (6.2) (52.8) Net income attributable to noncontrolling interests (1.8) — (1.8) — (1.8) Net income from continuing operations attributable to Avient shareholders $ 132.0 $ 24.8 $ 156.8 $ 20.7 $ 177.5 Weighted average diluted shares 90.6 Impact to diluted shares from January 2020 equity offering 1.5 Pro forma weighted average diluted shares 92.1 Pro forma adjusted EPS $ 1.93 December 31, 2019 Reconciliation of Pro Forma Adjusted Earnings per Share Avient Special Adjusted Clariant MB Pro Forma Pro Forma Adjusted Sales $ 2,862.7 $ — $ 2,862.7 $ 1,118.6 $ 3,981.3 Operating income $ 156.8 $ 71.7 $ 228.5 $ 72.9 $ 301.4 Interest expense, net (59.5) — (59.5) (33.4) (92.9) Other income, net 12.1 (10.0) 2.1 — 2.1 Income taxes (33.7) (5.9) (39.6) (9.1) (48.7) Net income attributable to noncontrolling interests (0.2) — (0.2) — (0.2) Net income from continuing operations attributable to Avient shareholders $ 75.5 $ 55.8 $ 131.3 $ 30.4 $ 161.7 Weighted average diluted shares 77.7 Impact to diluted shares from January 2020 equity offering 15.3 Pro forma weighted average diluted shares 93.0 Pro forma adjusted EPS $ 1.74 4 AVNT Q2 2021 Earnings Presentation - Website NEW.pdf AVNT Q2 2021 Earnings Presentation - Website.pdf Final - 7.19 1158am Q2 21 IR Deck Version v2

Bergmann GmbH Adolf-Dambach-Str. 2-4 76571 Gaggenau c/o Avient ECCOH High Performance Solutions GmbH Oldendorfer Straße 9, 49324 Melle Produktion von technischen Thermoplasten

AQUARIUS™ SB - RED CONCENTRATE 9.

Certificate of Approval Certificate n°: FR079697-1 Contract n°: 15701960 Revision date: 22 February 2023 Laurent CROGUENNEC - President Local office: Bureau Veritas Certification France Le Triangle de l'Arche - 9 Cours du Triangle - 92937 Paris La Défense Further clarifications regarding the scope of this certificate the applicability of the management system requirements may be obtained by consulting the organization.

POLYONE FRANCE TOSSIAT 43, PLACE DE LA GARE 01250 TOSSIAT FRANCE Bureau Veritas Certification France certify that the Management System of the above organization has been audited and found to be in accordance with the requirements of the management system standard detailed below: Standard ISO 14001:2015 Scope of certification THE DESIGN AND MANUFACTURE OF COLOUR AND ADDITIVE CONCENTRATES FOR THERMOPLASTICS Certification/Recertification Cycle Start Date: 03 May 2023 Subject to the continued satisfactory operation of the organization’s Management System, this certificate expires on: 02 May 2026 Expiry date of previous cycle: NA Certification/Recertification Audit date: 08 March 2023 Original Cycle Start Date: 15 July 2011 Certificate n°: FR081968-1 File n°:15608678 Revision date:24 April 2023 Laurent CROGUENNEC - President Local Office: Bureau Veritas Certification France Le Triangle de l'Arche - 9 Cours du Triangle - 92937 Paris La Défense Further clarifications regarding the scope of this certificate the applicability of the management system requirements may be obtained by consulting the organization.

MSC Certificate Place and date: For the issuing office: Shanghai, 20 March 2024 DNV - Business Assurance Building 9, No. 1591 Hongqiao Road, Changning DistrictShanghai China 200336 Zhu Hai Ming Management Representative Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid.

Bergmann GmbH Adolf-Dambach-Str. 2-4 76571 Gaggenau c/o Avient ECCOH High Performance Solutions GmbH Oldendorfer Straße 9, 49324 Melle Produktion von technischen Thermoplasten