Fuel economy requirements in some countries recently became much tougher, with failure to comply bringing serious financial penalties.

Page 3 • This presentation includes the use of both GAAP (generally accepted accounting principles) and non-GAAP financial measures. In certain cases throughout this presentation, we have presented GAAP and non-GAAP financial measures Use of Non GAAP Measures presentation, we have presented GAAP and non-GAAP financial measures adjusted to reflect full-year 2011 Pro forma results, including ColorMatrix A reconciliation of each non-GAAP financial measure with the most directly comparable GAAP financial measure is attached to this presentation which is posted on our website at www.polyone.com.

STAN-TONE HCC-29053 FINANCIAL GRAY

Looking forward, Avient’s Sustainable Sourcing Program is developing a framework to hold our partners accountable to improve upon their sustainable supply chain, including analyzing areas of risk such as quality, environmental, social, geopolitical financial, conflict minerals, and more.

Financials

Discuss with management and the independent auditor the financial information to be included in the Company’s Annual Report on Form 10-K, including the annual audited financial statements and the Company’s disclosures in “Management’s Discussion and Analysis of Financial Condition and Results of Operations”. 2. Discuss with management and the independent auditor the financial information to be included in the Company’s Quarterly Reports on Form 10-Q, including the quarterly financial statements and the Company’s disclosures in “Management’s Discussion and Analysis of Financial Condition and Results of Operations”. 3. Discuss the Company’s quarterly earnings press releases, including with respect to the use of any “pro forma” or “adjusted” financial information not presented in accordance with generally accepted accounting principles, as well as financial information and earnings guidance, if any, provided to investors, analysts, rating agencies or financial institutions. 5.

EPS – Q2 2025 $0.79 2025 financial guidance unchanged Non-GAAP financial measures have limitations as analytical tools and should not be considered in isolation from, or solely as alternatives to, financial measures prepared in accordance with GAAP. Below is a reconciliation of these non-GAAP financial measures to their most directly comparable financial measures calculated and presented in accordance with GAAP.

A reconciliation of each historical non-GAAP financial measure with the most directly comparable GAAP financial measure is attached to this presentation which is posted on our website at www.avient.com. EPS – Q2 2025 $0.79 2025 financial guidance unchanged Below is a reconciliation of these non-GAAP financial measures to their most directly comparable financial measures calculated and presented in accordance with GAAP.

A reconciliation of each historical non-GAAP financial measure with the most directly comparable GAAP financial measure is attached to this presentation which is posted on our website at www.avient.com. Non-GAAP financial measures have limitations as analytical tools and should not be considered in isolation from, or solely as alternatives to, financial measures prepared in accordance with GAAP. The presentation of these measures may be different from non-GAAP financial measures used by other companies.

A reconciliation of each historical non-GAAP financial measure with the most directly comparable GAAP financial measure is attached to this presentation which is posted on our website at www.avient.com. Non-GAAP financial measures have limitations as analytical tools and should not be considered in isolation from, or solely as alternatives to, financial measures prepared in accordance with GAAP. The presentation of these measures may be different from non-GAAP financial measures used by other companies.