Cesa™ Low Retention Additives Cesa™ Low Retention Additives enable olefinic surfaces to easily repel water and fluids when at room temperature. These additives minimize the need to apply secondary coatings in order to achieve the same performance. KEY CHARACTERISTICS • Eliminates secondary coating operations • Easily delivers the last drop out of a container • Reduces residual content • Reduces production costs • Won’t impact visual clarity • Non-PFAS formulations available APPLICATIONS Cesa Low Retention Additives are suitable for any olefinic application that would benefit from the ability to repel water or fluids, including: • Labware, including pipette tips • Monofilaments • Industrial fixtures • Woven fibers • Platform mats • Molded optical lenses • Medical devices • Extruded films • Carpet fibers • Textiles PRODUCT BULLETIN

FX +8.5% FX -0.4% Total Avient +8.1% Note: Regional Sales Percentages exclude impact of foreign exchange COLOR, ADDITIVES & INKS SEGMENT (Q3 2024 PERFORMANCE VS Q3 2023) $487 $522 Q3 23 Q3 24 $89 $97 Q3 23 Q3 24 Sales Adjusted EBITDA (in millions) (in millions) Sales Adjusted EBITDA 7 + 7% (+8% excluding FX) + 9% (+11% excluding FX) 18.3% +40 bps *18.7% * * Adjusted EBITDA Margin % • Sales growth driven by winning new product specifications in consumer & packaging, strong underlying demand in healthcare and improving demand in building & construction • Favorable mix and raw material deflation contributed to EBITDA margin expansion SPECIALTY ENGINEERED MATERIALS SEGMENT (Q3 2024 PERFORMANCE VS Q3 2023) $268 $295 Q3 23 Q3 24 $51 $57 Q3 23 Q3 24 Sales Adjusted EBITDA (in millions) (in millions) Sales Adjusted EBITDA 8 • Sales growth driven by restocking in healthcare & consumer end markets and strong underlying demand for composite applications used in building & construction, energy and defense end markets • Favorable mix contributed to EBITDA margin expansion + 10% (+10% excluding FX) + 12% (+13% excluding FX) 19.0% +40 bps *19.4% * * Adjusted EBITDA Margin % 2024 G U IDA N CE FY 2024 GUIDANCE Previous (Aug 6) Current Adjusted EPS $2.55 to $2.70 $2.63 to $2.67 Adjusted EBITDA $515 to $540 million $525 to $530 million Interest Expense $105 million $104 million Adjusted Effective Tax Rate 23% to 25% 23% to 25% Capital Expenditures & Investment in S/4 Hana ~$140 million ~$140 million 10 11 • Investor Day to be held December 4, 2024 at the NYSE, beginning at 10AM • The focus will be to do a deep dive on the Company’s strategy • Registration and microsite will be available in early November 2024 AVIENT INVESTOR DAY AP P EN D IX 18 Performance Additives 15% Pigments 13% TiO2 9% Dyestuffs 2% Polyethylene 10%Nylon 5% Polypropylene 4% Styrenic Block Copolymer 4% Other Raw Materials 38% ~40% hydrocarbon based (Grey shaded materials are hydrocarbon based, includes portion of “Other Raw Materials”) Non-hydrocarbon based materials RAW MATERIAL BASKET SEGMENT DATA U.S. & Canada 41% EMEA 36% Asia 18% Latin America 5% 2023 SEGMENT, END MARKET AND GEOGRAPHY GEOGRAPHY REVENUESEGMENT FINANCIALS Consumer 19% Packaging 23%Industrial 16% Building and Construction 9% Telecommunications 4% Energy 5% Defense 7% END MARKET REVENUE $2,007M $358M $1,138M $224M Sales EBITDA Specialty Engineered Materials Color Additives and Inks $502M$3,143M (1) Transportation 10% Healthcare 7% 20 (1) Total company sales and adjusted EBITDA of $3,143M and $502M, respectively, include intercompany sales eliminations and corporate costs 2023 REVENUE | $2 .0 B ILL ION US & Canada 34% EMEA 37% Asia 21% Latin America 8% END MARKET REGION 21 Packaging 34% Consumer 21% Healthcare 8% Industrial 15% Transportation 9% Building & Construction 10% Telecommunications 1% Energy 2% COLOR, ADDITIVES & INKS 2023 REVENUE | $1 .1 B ILL ION US & Canada 52% EMEA 35% Asia 13% 22 Packaging 5% Consumer 16% Healthcare 6%Industrial 16% Transportation 12% Telecommunications 9% Energy 10% Defense 18% Building & Construction 8% END MARKET REGION SPECIALTY ENGINEERED MATERIALS Packaging 32% Consumer 26% Healthcare 9% Industrial 13% Building & Construction 6% Telecommunications 2% Energy 2% Defense 1% Asia (18% of sales) Transportation 9% 2023 AVIENT REGIONAL SALES Packaging 25% Consumer 13% Healthcare 5% Industrial 18% Building & Construction 9% Energy 5% Defense 8% EMEA (36% of sales)Transportation 13% Packaging 13% Consumer 22% Healthcare 10% Industrial 16% Building & Construction 12% Energy 6% Defense 8% US & Canada (41% of sales) Transportation 9% Packaging 59% Consumer 22% Healthcare 2% Industrial 8% Building & Construction 4% LATAM (5% of sales) Transportation 5% Telecommunications 4% Telecommunications 4% 23 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. In addition, operating income before the effect of special items is a component of Avient’s annual incentive plans and is used in debt covenant computations. Three Months Ended September 30, 2024 2023 Reconciliation to Condensed Consolidated Statements of Income $ EPS(1) $ EPS(1) Net income from continuing operations attributable to Avient shareholders $ 38.2 $ 0.41 $ 5.1 $ 0.06 Special items, after-tax 6.6 0.07 32.0 0.35 Amortization expense, after-tax 15.0 0.16 15.2 0.16 Adjusted net income / EPS $ 59.8 $ 0.65 $ 52.3 $ 0.57 (1) Per share amounts may not recalculate from figures presented herein due to rounding Three Months Ended September 30, Reconciliation to EBITDA and Adjusted EBITDA: 2024 2023 Net income from continuing operations – GAAP $ 38.7 $ 5.1 Income tax expense (benefit) 11.3 (0.1) Interest expense, net 26.9 30.3 Depreciation & amortization 45.1 46.4 EBITDA from continuing operations $ 122.0 $ 81.7 Special items, before tax 9.7 43.2 Interest expense included in special items (1.3) (2.2) Depreciation & amortization included in special items (0.4) — Adjusted EBITDA $ 130.0 $ 122.7 Adjusted EBITDA as a percent of sales 15.9 % 16.3 % 1 Three Months Ended September 30, 2024 2023 Sales: Color, Additives and Inks $ 521.5 $ 486.5 Specialty Engineered Materials 294.6 267.9 Corporate (0.9) (0.7) Sales $ 815.2 $ 753.7 Operating income: Color, Additives and Inks $ 75.5 $ 64.5 Specialty Engineered Materials 36.4 30.3 Corporate (34.7) (60.5) Operating income $ 77.2 $ 34.3 Depreciation & amortization: Color, Additives and Inks $ 21.9 $ 24.6 Specialty Engineered Materials 20.7 20.5 Corporate 2.5 1.3 Depreciation & amortization $ 45.1 $ 46.4 Earnings before interest, taxes, depreciation and amortization (EBITDA): Color, Additives and Inks $ 97.4 $ 89.1 Specialty Engineered Materials 57.1 50.8 Corporate (32.2) (59.2) Other (expense) income, net (0.3) 1.0 EBITDA from continuing operations $ 122.0 $ 81.7 Special items, before tax 9.7 43.2 Interest expense included in special items (1.3) (2.2) Depreciation & amortization included in special items (0.4) — Adjusted EBITDA $ 130.0 $ 122.7 Adjusted EBITDA as a percent of sales: Color, Additives and Inks 18.7 % 18.3 % Specialty Engineered Materials 19.4 % 19.0 % 2 Year Ended December 31, 2023 Operating income: Color, Additives and Inks $ 259.9 Specialty Engineered Materials 142.5 Corporate (205.6) Operating income $ 196.8 Depreciation & amortization: Color, Additives and Inks $ 98.3 Specialty Engineered Materials 81.5 Corporate 9.0 Depreciation & amortization $ 188.8 Earnings before interest, taxes, depreciation and amortization (EBITDA): Color, Additives and Inks $ 358.2 Specialty Engineered Materials 224.0 Corporate (196.6) Other income, net 5.8 EBITDA from continuing operations 391.4 Special items, before tax 114.6 Interest expense included in special items (2.3) Depreciation & amortization included in special items (1.9) Adjusted EBITDA $ 501.8 3 Avient Q3 Earnings Webcast Slides w_Appendix and Non-GAAP.pdf 2024 AVNT Q3 Webcast Slides w non-GAAP.pdf Q3 Avient Webcast Slides with Non-GAAP Recs.pdf Appendix Slides for webcast.pdf IR Deck - AVNT-2024.09.30 - 10.30.24 3PM (002).pdf Attachment

What is the range of liquid addition rate? Avient can provide support and assistance on every aspect of liquid color and additive processing.

In addition, this material can be used in tools originally constructed for halogenated materials with no rework required. Additional advantages of these TPEs include: • Highly flame retardant without the inclusion of halogens • Low temperature flexibility • Excellent processability • Good abrasion resistance • Excellent colorability • Operating temperatures from -50° C to +100° C • All grades meet UL94-V0 at 1.5 mm • All grades pass IEC 60695-2-12 Glow Wire Flammability Index (GWFI) at 960°C

ColorMatrix™ rePrize™ is a patent- protected, liquid formulation IV builder designed for addition to the extrusion process during the manufacture of rPET. ColorMatrix rePrize is a very reactive additive and any changes to the extruder temperatures and parameters will have an effect on melt viscosity of the polymer and also the finished article.

COLORMATRIX™ OXYGEN SCAVENGER PRODUCT FAMILY Amosorb™ and Amosorb™ SolO2 active oxygen scavengers ColorMatrix™ Amosorb™ additives are oxygen scavenging polyester concentrates that create an active barrier against the ingress of oxygen through the walls of PET containers. These ready-to-use technologies offer extended shelf life capabilities and the flexibility to manage the additional demands of rPET usage, resin compatibility and flexibility, sustainability, light- weighting, aesthetics, market seasonality and carbonated oxygen sensitive beverages.

Higher levels of acetaldehyde; off-taste in water ColorMatrix™ Triple A™ Acetaldehyde Scavenger Additive to control levels of acetaldehyde within the preform, allowing for higher levels of rPET to be used. Color degradation; product protection ColorMatrix™ Ultimate™ UV Light Barrier APR/EPBP approved additive to block ultraviolet light transmission Protects the product and brand integrity during storage, transportation and in the retail environment, maintaining product quality and enhancing shelf life.

PRODUCT BULLETIN Cesa™ Nox A4R Additives for Recycling Polyolefin Antioxidant for Enhanced Recycling RECYCLED MATERIAL IN A CHANGING MARKET Legislation globally is driving change towards increased quantities of post-consumer recycled materials (PCR), further encouraged by the implementation of usage targets and new tariffs. It is a specialized antioxidant additive that stabilizes polyolefins during processing—preventing the typical defects like discoloration, gels, and black spots—during initial, and future conversion steps and recycling loops.

In addition, to make brass machinable, lead is typically added, introducing environmental and health risks. Don Houston of API said, “In addition to all these drawbacks, brass valves have to be joined to plastic piping with steel fittings.

By applying our technology and experience, we can help you to enhance these materials with color, additives and fibers. With the help of select colorants, fiber reinforcements and additives, we customize these polymers to meet the demanding requirements of our customers’ applications.