LABORATORY EQUIPMENT MANUFACTURER P C R W E L L P L A T E S • Very high level of TiO2 to prevent “cross-talk” between the wells during the qPCR fluorescence testing procedure • Minimized background phosphorescence caused by agglomeration of TiO2 and/or oxidized (stressed) polystyrene • Preservation of polystyrene grade properties • Change control of formulation and manufacturing process • Robust product quality from batch to batch • Developed optimally dispersed, ready-to-use white formulation that maintains adequate signal transmission, as well as minimizing “cross-talk” and background phosphorescence • Optimized the use of general purpose polystyrene (GPPS) for a good balance between melt flow and other physical properties, such as stiffness • Provided comprehensive change control of raw materials and formulation, with a robust manufacturing process and quality control under a third party ISO 13485:2016 certified QMS Mevopur Healthcare Colorants and Formulations – pre-colored solution WHY AVIENT?

Avient corporation first quarter 2024 results and 2024 financial guidance AVIENT CORPORATION F I R S T Q U A R T E R 2 0 2 4 R E S U L T S A N D 2 0 2 4 F I N A N C I A L G U I D A N C E (NYSE: AVNT) M AY 7 , 2 0 2 4 DISCLAIMER Forward-Looking Statements Certain statements contained in or incorporated by reference into this presentation constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995.

Das geistige Eigentum von Avient ist zu respektieren (d. h.

Ezcabarte calle H Nº3 Oricain, Navarra 31194 Facility: Avient Corporation - Phan Thong 700/848 Moo 1,Tambol Phan Thong Amata City Chonburi Industrial Estate Phan Thong, Chonburi 20160 Thailand Activity: Manufacture of Masterbatches, Additives, ECCOH, and Compounds for Pigmenting Thermoplastic Activity: Design and Manufacture of Colorants and Additives for Plastics Facility: Avient Corporation - Pogliano, Italy Via Lainate 26 20005, Pogliano Milanese, Milano Facility: Avient Corporation - Randburg, South Africa 329 Tungsten Rd, Strydompark Randburg, Gauteng 2194 South Africa Activity: Manufacture of Colour and Additive Concentrates, Thermoplastic Resins and Specialty Compounds Activity: Manufacture of Masterbatches Facility: NEU Specialty Engineered Materials, LLC 15 Corporate Drive North Haven, CT 06473 Facility: Avient Corporation - Norwalk, OH 80 North West Street Norwalk, OH 44857 Activity: Compound, Supply, and Prototyping Services of Thermoplastics Activity: Design and Manufacture of Colorants and Additives for Plastics Page 8 of 10 Facility: Avient Corporation - Sant Andreu, Spain Crta.

Ezcabarte calle H Nº3 Oricain, Navarra 31194 Facility: Avient Corporation - Phan Thong 700/848 Moo 1,Tambol Phan Thong Amata City Chonburi Industrial Estate Phan Thong, Chonburi 20160 Thailand Activity: Manufacture of Masterbatches, Additives, ECCOH, and Compounds for Pigmenting Thermoplastic Activity: Design and Manufacture of Colorants and Additives for Plastics Facility: Avient Corporation - Pogliano, Italy Via Lainate 26 20005, Pogliano Milanese, Milano Facility: Avient Corporation - Randburg, South Africa 329 Tungsten Rd, Strydompark Randburg, Gauteng 2194 South Africa Activity: Design and Manufacture of Colour and Additive Concentrates, Activity: Manufacture of Masterbatches Facility: NEU Specialty Engineered Materials, LLC 15 Corporate Drive North Haven, CT 06473 Facility: Avient Corporation - Norwalk, OH 80 North West Street Norwalk, OH 44857 Activity: Compound, Supply, and Prototyping Services of Thermoplastics Activity: Design and Manufacture of Colorants and Additives for Plastics Page 8 of 10 Facility: Avient Corporation - Sant Andreu, Spain Crta.

Only naturally balanced runner systems (“H” pattern) are recommended. 3.

Ezcabarte calle H Nº3 Oricain, Navarra 31194 Facility: Avient Corporation - Phan Thong 700/848 Moo 1,Tambol Phan Thong Amata City Chonburi Industrial Estate Phan Thong, Chonburi 20160 Thailand Activity: Manufacture of Masterbatches, Additives, ECCOH, and Compounds for Pigmenting Thermoplastic Facility: Avient Corporation - Pogliano, Italy Via Lainate 26 20005, Pogliano Milanese, Milano Facility: Avient Corporation - Randburg, South Africa 329 Tungsten Rd, Strydompark Randburg, Gauteng 2194 South Africa Activity: Manufacture of Colour and Additive Concentrates, Thermoplastic Resins and Specialty Compounds Activity: Manufacture of Masterbatches Facility: NEU Specialty Engineered Materials, LLC 15 Corporate Drive North Haven, CT 06473 Facility: Avient Corporation - Norwalk, OH 80 North West Street Norwalk, OH 44857 Activity: Compound, Supply, and Prototyping Services of Thermoplastics Activity: Design and Manufacture of Colorants and Additives for Plastics Page 8 of 10 Facility: Avient Corporation - Sant Andreu, Spain Crta.

No. 1, Qihang Industry Park, Haoxiang Road, Shajing Town, Baoan, Shenzhen, Guangdong, China 518104 has been found to conform to the Quality Management System standard: GB/T 19001-2016 / ISO 9001:2015 This certificate is valid for the following scope: Development and Manufacture of Masterbatch, Pigment Concentration, Plastisol; Manufacture of Plastic Compounding Material http://www.dnv.com/assurance 证书制作地点及日期: 证书认可签发机构: 上海, 2024年10月 10日 DNV - Business Assurance 中国上海市长宁区虹桥路1591号9号楼A座 邮编: 200336 电话: +86 21 32799000 朱海明 管理代表 未履行认证协议中规定条款会导致此证书失效，获证组织必须定期接受监督审核并经审核合格此证书方继续有效。 获得认可的单位: DNV Business Assurance B.V., Zwolseweg 1, 2994 LB, Barendrecht, Netherlands - TEL: +31(0)102922689. www.dnv.com/assurance 本证书信息可在国家认证认可监督管理委员会官方网站（WWW.CNCA.GOV.CN） 上查询 管理体系认证证书 证书号码: 3033-2006-AQ-RGC-RvA 首次签发日期: 2018年11月 07日 有效期限: 2024年11月 08日 – 2027年11月 07日 兹证明 普立万聚合体（深圳）有限公司 中国广东省深圳市宝安区沙井镇蚝乡路启航工业园1号 518104 统一社会信用代码：9144030076498189X0 质量管理体系符合 : GB/T 19001-2016 / ISO 9001:2015标准 此证书对下列范围有效: 色母粒，色浆，增塑溶胶的开发和制造；塑料改性材料的制造 http://www.dnv.com/assurance WWW.CNCA.GOV.CN）上查询

FEARON Richard H. POWELL William H. Lin, William H.

Types T-29 : Standard Modulus. T-49 : High Modulus. AP : 15% higher tenacity than T-29.