Cesa Unify A4R is a compatibilizer additive for use with recycled polyolefins, which helps enhance circularity. Avient is leading the way in helping to support a more sustainable and circular economy through improved polyolefin recycling. To access Avient’s news library online, please visit www.avient.com/news.    

PolyOne’s collection of specialty solutions help customers gain a competitive advantage by incorporating innovative, high performance technology. OnCap™ Anti-Static Technology – Helps protect manikins and models from attracting unwanted dirt and debris so they will stay cleaner longer To access PolyOne’s news library online, please go to www.polyone.com/news.

NYSE: AVNT) is to be an innovator of materials solutions that help our customers succeed, while enabling a sustainable world.  In doing so, we innovate solutions that help our customers overcome their challenges or capitalize on opportunities provided by the fast-changing world and secular trends.  news library online, please visit www.avient.com/news

NYSE: AVNT) is to be an innovator of materials solutions that help our customers succeed, while enabling a sustainable world.  In doing so, we innovate solutions that help our customers overcome their challenges or capitalize on opportunities provided by the fast-changing world and secular trends.  news library online, please visit www.avient.com/news

DÜSSELDORF – April 16, 2018 – At Wire 2018 today, PolyOne announced its ECCOH™ non-halogen, highly flame-retardant polymers are helping wire and cable manufacturers meet new European Union (EU) construction product regulations (CPR). Photo Caption: ECCOH™ flame retardant, non-halogen materials from PolyOne help manufacturers meet CPR standards for fire safety. To access PolyOne’s news library online, please go to www.polyone.com/news.

Our Responsibility All Avient officers, associates, and third parties acting on behalf of Avient are responsible for understanding and complying with this Policy and each of them has an obligation to: • Be familiar with applicable aspects of the Policy and communicate them to subordinates • Ask questions if the Policy or action required to be taken in a particular situation is unclear • Properly manage and monitor business activities conducted through third parties • Be alert to indications or evidence of possible wrongdoing • Promptly report violations or suspected violations through appropriate channels ABAC Laws make it unlawful for any company or person to offer, promise, pay or authorize the payment of anything of value to any individual2 to help keep or secure business or obtain some other improper business advantage. Bribes may include: • Cash and cash equivalents (gift cards or gift certificates) • Gifts, entertainment and hospitality where is no clear business purpose or they are in excess of reasonable business needs • Payment of travel expenses or providing vacations • Paying a government official to ignore an applicable customs requirement or to accelerate a tax refund • Personal services, favors, loans • Offers of employment or other benefits to a family member or friend of the individual • Political party and candidate contributions • Charitable donations and sponsorships Other less obvious items can also be a violation. subject= http://avient.ethicspoint.com 5 Quick Reference: ABAC DOs AND DON’Ts DO ✓ Know that Avient prohibits any form of bribery and corruption and does not allow facilitation payments ✓ Be familiar with applicable aspects of our ABAC Policies and communicate them to subordinates and third parties ✓ Ask questions if the Policies or actions required to be taken are unclear ✓ Promptly report violations or suspected violations to your supervisor, the Legal Department or the Ethics Hotline ✓ Know that “value” is not necessarily measured in monetary terms ✓ Know that bribes can include the following: • Cash and cash equivalents (gift cards or gift certificates) • Gifts, entertainment and hospitality where there is no clear business purpose or they are in excess of business needs • Payment of travel expenses or vacations • Paying a government official to ignore an applicable customs requirement or to accelerate a tax refund • Personal services, favors, and loans • Offers of employment or other benefits to a family member or friend of the individual who has influence • Political party and candidate contributions • Charitable donations and sponsorships • Other less obvious items include in-kind contributions, investment opportunities and favorable or steered subcontracts ✓ Know that the prohibition applies whether an item would benefit the individual directly or another person, such as a family member, friend or business associate ✓ Keep books, records, and accounts in reasonable detail, and accurately and fairly reflect the transaction ✓ Conduct due diligence on agents, distributors, and other third parties prior to engagement and during the relationship and obtain Legal Department approval ✓ Properly manage and monitor business activities conducted through third-parties DON’T x Offer, promise, pay, or authorize the payment of anything of value to any government official and/or private sector employees to help Avient obtain or keep business or secure some other improper business advantage.

Avient Corporation (NYSE:AVNT) is an innovator of materials solutions to help our customers succeed, while enabling a sustainable world. Our deep materials science knowledge combined with our advanced processing expertise helps our customers meet their robust performance and form factor requirements. Our experienced scientists are focused on providing unique innovations to help our customers succeed.

– To help medical device manufacturers develop ways to address healthcare-associated infections (HAIs), PolyOne is launching two new PolyOne Collaborates to Help CelebriDucks Offer Safe Water Toys for Children PolyOne Helps PolyCase Win “Ammo of the Year” with Polymer-Based Ammunition

We also monitor earnings (defined as net income from continuing operations) before interest, taxes, depreciation and amortization (EBITDA) and adjusted EBITDA (EBITDA before the impact of special items) as a supplement to our GAAP measures. Three Months Ended December 31, 2023 2022 Reconciliation to Condensed Consolidated Statements of Income $ EPS(1) $ EPS(1) Net income (loss) from continuing operations attributable to Avient shareholders $ 27.8 $ 0.30 $ (17.0) $ (0.19) Special items, after tax (Attachment 3) 5.4 0.06 38.3 0.42 Amortization expense, after-tax 15.0 0.16 14.6 0.16 Adjusted net income / EPS $ 48.2 $ 0.52 $ 35.9 $ 0.39 (1) Per share amounts may not recalculate from figures presented herein due to rounding Year Ended December 31, 2023 2022 Reconciliation to Condensed Consolidated Statements of Income $ EPS(1) $ EPS(1) Net income from continuing operations attributable to Avient shareholders $ 75.8 $ 0.83 $ 82.8 $ 0.90 Special items, after tax (Attachment 3) 79.3 0.86 116.2 1.26 Amortization expense, after-tax 61.5 0.67 49.0 0.53 Adjusted net income / EPS $ 216.6 $ 2.36 $ 248.0 $ 2.69 (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 Pro Forma Adjusted EBITDA 2023 2022 2023 2022 Sales - GAAP $ 719.0 $ 790.4 $ 3,142.8 $ 3,396.9 Pro forma APM adjustments — — — 256.1 Pro forma adjusted sales $ 719.0 $ 790.4 $ 3,142.8 $ 3,653.0 Net income (loss) from continuing operations – GAAP $ 27.6 $ (16.6) $ 76.3 $ 83.1 Income tax (benefit) expense (7.0) (60.8) 11.0 (19.3) Interest expense 26.8 49.4 115.3 119.8 Depreciation and amortization from continuing operations 44.2 48.6 188.8 162.5 EBITDA from continuing operations $ 91.6 $ 20.6 $ 391.4 $ 346.1 Special items, before tax 22.4 104.3 114.6 194.0 Interest expense included in special items (0.1) (16.0) (2.3) (26.0) Depreciation and amortization included in special items — (1.5) (1.9) (5.5) Adjusted EBITDA $ 113.9 $ 107.4 $ 501.8 $ 508.6 APM pro forma adjustments - 8 months 2022* — — — 83.1 Pro forma adjusted EBITDA $ 113.9 $ 107.4 $ 501.8 $ 591.7 Pro forma adjusted EBITDA as a percent of sales 15.8 % 13.6 % 16.0 % 16.2 % * Pro forma adjustment for January - August 2022 APM results (period before Avient ownership). Three Months Ended Year Ended Reconciliation of Pro Forma Adjusted Earnings per Share December 31, 2022 Net (loss) income from continuing operations attributable to Avient shareholders $ (17.0) $ 82.8 Special items, after tax 38.3 116.2 Amortization expense, after-tax 14.6 49.0 Adjusted net income from continuing operations excluding special items 35.9 248.0 Pro forma adjustments* 2.5 13.6 APM pro forma amortization expense, after-tax* — 19.1 Pro forma adjusted net income from continuing operations attributable to Avient shareholders $ 38.4 $ 280.7 Weighted average diluted shares 91.7 92.2 Pro forma adjusted EPS - excluding special items pro forma for APM acquisition $ 0.42 $ 3.04 * Pro forma adjustment to reflect APM results for the period before Avient ownership including the impacts of debt financing and paydown of debt with net proceeds from the Distribution sale.

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