Enhanced customer focus 2. Play bigger and bolder in high growth markets and portfolios supported by secular trends to create product platforms of scale 2. Staying close to our customers to help them navigate the uncertain environment and execute their respective plans 2.

POLYMER FAMILY MATERIAL PRODUCT NAME PRODUCT TYPE DOSAGE Polyolefin PEAN698413 CESA Antimicro SE 99-58 Silver 2–7.5% Polyolefin PEAN698432 CESA Antimicro J8146 Zinc 1–4% Polypropylene PPA0698636 CESA Antimicro J8259 Zinc 1–4% Nylon ABA0820032 CESA Antimicro ABA0820032 Silver 2–7.5% Polyester NBAN698441 CESA Antimicro S58441 Silver 2–7.5% Polycarbonate NCAN820009 CESA Antimicro NCAN820009 Silver 2–7.5% TPU RUA0698433 CESA Antimicro J8843 Zinc 1–4% Styrenic SLA0820011 CESA Antimicro SLA0820011 Zinc 1–4%

Lin 41,772 (2) — 41,772 * Kim Ann Mink 22,431 (2) — 22,431 * Ernest Nicolas 8,810 — 8,810 * Kerry J. Avient also makes available executive physicals to all Named Executive Officers (used by all Named Executive Officers). 2022 GRANTS OF PLAN-BASED AWARDS Grant Date Estimated Future Payouts Under Non-Equity Incentive Plan Awards Estimated Future Payouts Under Equity Incentive Plan Awards All Other Awards: Shares of or Units Exercise or Base Price of Option ($/Sh) (i) Grant Date Fair Value of Stock and Option (j) Threshold Target Maximum Threshold (f) Target (g) — 150,497(1) 1,504,973(1) 3,009,946(1) — — — — — — 215,000(2) 1,720,000(2) 3,440,000(2) — — — — — 2/14/2022 — — — 44,900(3) 134,700(3) — 52.64 2,006,642 2/14/2022 — — — — — 38,150(4) — 2,008,216 — 42,509(1) 425,086(1) 850,172(1) — — — — — — 35,625(2) 285,000(2) 570,000(2) — — — — — 2/14/2022 — — — 7,4333) 22,300(3) — 52.64 332,206 2/14/2022 — — — — — 6,350(4) — 334,264 — 31,169(1) 311,688(1) 623,376(1) — — — — — — 25,500(2) 204,000(2) 408,000(2) — — — — — 2/14/2022 — — — 5,333(3) 16,000(3) — 52.64 238,354 2/14/2022 — — — — — 4,550(4) — 239,512 — 31,641(1) 316,408(1) 632,816(1) — — — — — — 28,875(2) 231,000(2) 462,000(2) — — — — — 2/14/2022 — — — 6,017(3) 18,050(3) — 52.64 268,893 2/14/2022 — — — — — 5,150(4) — 271,096 — 34,459(1) 344,594(1) 689,188(2) — — — — — — 25,500(2) 204,000(2) 408,000(2) — — — — — 2/14/2022 — — — 5,333(3) 16,000(3) — 52.64 238,354 2/14/2022 — — — — — 4,550(4) — 239,512 Estimated Future Payouts Under Non-Equity Incentive Plan Awards (columns (c), (d) and (e)) (1) 2022 Annual Incentive Program Opportunities. PROXY STATEMENT 2023 | Annual Meeting of Shareholders 77 OUTSTANDING EQUITY AWARDS AT 2022 FISCAL YEAR-END Option Awards Stock Awards Grant Date Exercisable Unexercise- able (1) Unearned (1) Exercise Price Expiration Date Shares or Units of Stock that have not Vested (2) Market Value of Shares or Units of Stock that have not Vested Unearned Shares, Units or Other Rights that have not Vested (3) Market or Payout Value of Unearned Shares, Units or Other Rights that have not Vested 2/10/2020 — — — — — 59,071 1,994,237 — — 2/08/2021 — — — — — 46,178 1,558,969 — — 2/14/2022 — — — — — 39,116 1,320,556 — — 5/15/2014 — — — — — — — 58,845 1,986,607 2/14/2018 31,516 — — 41.89 2/14/2028 — — — — 2/11/2019 51,150 — — 31.54 2/11/2029 — — — — 2/10/2020 57,516 57,517 — 31.48 2/10/2030 — — — — 2/08/2021 59,233 118,467 — 42.27 2/08/2031 — — — — 2/14/2022 — — 134,700 52.64 2/14/2032 — — — — 8/24/2020 — — — — — 42,202 1,424,740 — — 2/08/2021 — — — — — 7,100 239,696 — — 2/14/2022 — — — — — 6,513 219,879 — — 2/08/2021 9,066 18,134 — 42.27 2/08/2031 — — — — 2/14/2022 — — 22,300 52.64 2/14/2032 — — — — 2/10/2020 — — — — — 6,764 228,353 — — 2/08/2021 — — — — — 5,274 178,050 — — 2/14/2022 — — — — — 4,667 157,558 — — 2/04/2015 9,200 — — 38.27 2/4/2025 — — — — 2/15/2017 13,250 — — 34.10 2/15/2027 — — — — 2/14/2018 11,050 — — 41.89 2/14/2028 — — — — 2/11/2019 18,200 — — 31.54 2/11/2029 — — — — 2/10/2020 13,100 6,550 — 31.48 2/10/2030 — — — — 2/08/2021 6,716 13,434 — 42.27 2/08/2031 — — — — 2/14/2022 — — 16,000 52.64 2/14/2032 — — — — 2/20/2020 — — — — — 7,302 246,516 — — 2/08/2021 — — — — — 5,639 190,373 — — 2/14/2022 — — — — — 5,282 178,320 — — 2/15/2017 12,100 — — 34.10 2/15/2027 — — — — 2/14/2018 11,500 — — 41.89 2/14/2028 — — — — 2/11/2019 19,250 — — 31.54 2/11/2029 — — — — 2/10/2020 14,133 7,067 — 31.48 2/10/2030 — — — — 2/08/2021 7,216 14,434 — 42.27 2/08/2031 — — — — 2/14/2022 — — 18,050 52.64 2/14/2032 — — — — 2/10/2020 — — — — — 6,605 222,985 — — 2/08/2021 — — — — — 5,274 178,050 — — 2/14/2022 — — — — — 4,667 157,558 — — 2/11/2014 2,400 — — 35.07 2/11/2024 — — — — 2/04/2015 2,500 — — 38.27 2/4/2025 — — — — 2/10/2016 10,400 — — 24.98 2/10/2026 — — — — 2/15/2017 10,100 — — 34.10 2/15/2027 — — — — 2/14/2018 10,400 — — 41.89 2/14/2028 — — — — 2/11/2019 17,150 — — 31.54 2/11/2029 — — — — 2/10/2020 12,800 6,400 — 31.48 2/10/2030 — — — — 2/08/2021 6,716 13,434 — 42.27 2/08/2031 — — — — 2/14/2022 — — 16,000 52.64 2/14/2032 — — — — (1) Amounts in these columns represent stock-settled SARs that vest in one-third increments, with each one-third increment vesting on the later of (a) the first, second and third anniversary of the grant date, respectively and (b) the achievement of a stock price hurdle (based on Avient’s closing stock price and sustained for thirty consecutive trading days) applicable to that increment.

ECert.QECertificate Page 1 of 2 Validity of this certificate is based on the successful completion of the periodic surveillance audits of the management system defined by the above scope and is contingent upon prompt,written notification to ABS Quality Evaluations, Inc. of significant changes to the management system or components thereof. IATF 16949:2016 The Quality Management System is applicable to: Certificate No: 38972 Effective Date: 04 September 2018 Expiration Date: 03 September 2021 Issue Date: 31 December 2018 IATF No: 0328156 Alex Weisselberg, President DESIGN AND MANUFACTURE OF CUSTOM PVC PLASTISOL AND PVC SLUSH MOLD POWDER (WITH ADDITIONAL FACILITIES LISTED ON ATTACHED ANNEX) Certificate Of Conformance has been assessed by ABS Quality Evaluations, Inc. and found to be in conformance with the requirements set forth by: Page 2 of 2 ABS Quality Evaluations PolyOne Corporation IATF 16949:2016 Certificate Of Conformance ANNEX At Below Facilities: Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation.

1400 Ravello Drive, Katy, TX, 77449-5164, USA - TEL: +1 281-396-1000. www.dnv.com Page 1 of 2 MANAGEMENT SYSTEM CERTIFICATE Certificate no.: 11229-2006-CHN-IATF IATF Certificate No: 0573810 Valid: 21 May 2025 – 20 May 2028 This is to certify that the management system of PolyOne - Suzhou, China EM Sector, 77 Shenggang Street, Suzhou Industrial Park, Suzhou, Jiangsu, China 215024 (USI: CF4943) and, if applicable, the remote supporting locations as mentioned in the Appendix accompanying this Certificate has been found to conform to the Quality Management System standard: IATF 16949:2016 This certificate is valid for the following scope: DESIGN AND MANUFACTURE OF PLASTIC COMPOUNDING MATERIAL EXCLUSION: NONE http://www.dnv.com Certificate no.: 11229-2006-CHN-IATF IATF Certificate No: 0573810 Place and date: Katy, TX, 22 May 2025 Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. ACCREDITED UNIT: DNV Business Assurance USA Inc., 1400 Ravello Drive, Katy, TX, 77449-5164, USA - TEL: +1 281-396-1000. www.dnv.com Page 2 of 2 Appendix to Certificate PolyOne - Suzhou, China Remote Support Locations included in the certification are as follows: Site Name Site Address RSL Activities Certification Body Avient China Co., Ltd.

ECert - 2023-01-13T114926.191.pdf Page 1 of 2 Validity of this certificate is based on the successful completion of the periodic surveillance audits of the management system defined by the above scope and is contingent upon prompt,written notification to ABS Quality Evaluations, Inc. of significant changes to the management system or components thereof. WITH ADDITIONAL FACILITIES LISTED ON ATTACHED ANNEX) Certificate Of Conformance has been assessed by ABS Quality Evaluations, Inc. and found to be in conformance with the requirements set forth by: Page 2 of 2 ABS Quality Evaluations Avient Corporation ISO 13485:2016 Certificate Of Conformance ANNEX At Below Facilities: Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation.

Page 1 of 2 ABS Quality Evaluations IATF 16949:2016 Certificate Of Conformance ANNEX Certificate No: IATF No: 38972 0422162 Avient Corporation Engineered Materials Division At Below Facilities: Facility: Corporate 33587 Walker Road Avon Lake, OH 44012 U.S.A. Page 2 of 2

ECert - 2020-11-17T151438.723.pdf Page 1 of 2 Validity of this certificate is based on the successful completion of the periodic surveillance audits of the management system defined by the above scope and is contingent upon prompt,written notification to ABS Quality Evaluations, Inc. of significant changes to the management system or components thereof. IATF 16949:2016 The Quality Management System is applicable to: Certificate No: 58976 Effective Date: 08 February 2019 Expiration Date: 09 August 2022 Revision Date: 17 November 2020 IATF No: 0349837 Dominic Townsend, President DESIGN AND MANUFACTURE OF THERMOPLASTIC COMPOUNDS (WITH ADDITIONAL FACILITIES LISTED ON ATTACHED ANNEX) Certificate Of Conformance has been assessed by ABS Quality Evaluations, Inc. and found to be in conformance with the requirements set forth by: Page 2 of 2 ABS Quality Evaluations Avient Corporation IATF 16949:2016 Certificate Of Conformance ANNEX At Below Facilities: Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation.

Any translations of this document shall be used for reference only.) 1/2 Certificate of Approval AWARDED TO PolyOne France Tossiat Route de la vavrette, 01250, Tossiat - France IATF USI: LWZS4P Bureau Veritas Certification certify that the Quality Management System of the above organisation has been audited and found to be in accordance with the requirements of IATF 16949 - FIRST EDITION and the applicable customer specific requirements SCOPE Design and manufacturing PERMITTED EXCLUSION(S) None PRODUCT(S) DELIVERED colour with additive concentrates for thermoplastic resins and speciality compounds obtained by mixing and extrusion https://e-cer.bureauveritas.com/68LJQE0ZV0CO6I7YW0YSXOUMV9WWROQPHPI2AOHRRLFFVRAVTFVZGXKWIE3TOWLTTKEWCPQB9UNAPXHH6T0HXOMUEDVYPRPJLEXBBTKQYPBRICYOKY143TECQ5UMHGA3JX Date Of Certification: 11 December 2024 Date Of Expiration: 10 December 2027 IATF Certificate N°: 0558656 Bureau Veritas Certification Certificate No: FR094003 - IATF Revision: 1 For Bureau Veritas Certification Holding, Tour ALTO, 4 place des saisons, 92400 COURBEVOIE – France (The official document is in English. Any translations of this document shall be used for reference only.) 2/2 Appendix to the Certificate of Approval AWARDED TO PolyOne France Tossiat Route de la vavrette, 01250, Tossiat - France IATF USI: LWZS4P REMOTE SUPPORT FUNCTION(S) NAME ADDRESS SCOPE AVIENT LUXEMBOURG 19, Route de bastogne, 9638, Pommerloch - Luxembourg IATF USI: GAZS9A Purchasing, Logistics, Supplier Management PolyOne Europe Logistics 7 Rue bleriot, 4460, Grace-Hollogne - Belgium IATF USI: P4WA4Y Warehousing Polyone Poland Ul. wschdnia 6, 99-300, Kutno - Poland IATF USI: C4W5ZL Logistics https://e-cer.bureauveritas.com/68LJQE0ZV0CO6I7YW0YSXOUMV9WWROQPHPI2AOHRRLFFVRAVTFVZGXKWIE3TOWLTTKEWCPQB9UNAPXHH6T0HXOMUEDVYPRPJLEXBBTKQYPBRICYOKY143TECQ5UMHGA3JX 2024-12-13T10:07:11+0100 Authenticity and Integrity

Certificate of Registration 9001:2015 MSP 9001:2015–MSP-ANAB-US (2.0) Page 1 of 2 Certificate of Registration of Quality Management System to ISO 9001:2015 The National Standards Authority of Ireland certifies that: Colorant Chromatics Ab Kroklundsvagen 346 AX-22 320 Odkarby Aland Finland has been assessed and deemed to comply with the requirements of the above standard in respect of the scope of operations given below: The Design, Manufacture and Sales of Fluoropolymer Color Concentrates and Compounds Additional sites covered under this multi-site certification are listed on the Annex (File No. 19.2540/C) Approved by: Geraldine LarkinChief Executive Officer Approved by: Lisa Greenleaf Operations Manager Registration Number: 19.2540/C Certification Granted: May 15, 1997 Effective Date: Oct 20, 2018 Expiry Date: Oct 19, 2021 National Standards Authority of Ireland, 20 Trafalgar Square, Nashua, New Hampshire, NH 03063, USA T +1 603 882 4412 9001:2015–MSP-ANAB-US (2.0) Page 2 of 2 Annex to Certificate Number: 19.2540/C Scope of Registration: The Design, Manufacture and Sales of Fluoropolymer Color Concentrates and Compounds Activity Location Central Management Group, Design, Manufacture Colorant Chromatics Kroklundsvagen 346 AX-22 320 Odkarby Aland Finland File No.: 19.2540/C Headquarters, Sales, Distribution Colorant Chromatics Europe B.V.