Company: AVNT
Filing Date: 2025-06-17
Form Type: 11-K
Source: 0001122976-25-000044
Chunk: 0

Company: AVIENT CORP
Filing Date: 2025-06-17
Form: 11-K
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549
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#### FORM 11-K
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(Mark One)

| ý |     | ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |

#### For the fiscal year ended December 31, 2024

#### OR
| ¨ |     | TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |

#### For the transition period from

#### to
#### .

#### Commission file number 1-16091
A. Full title of the plan and the address of the plan, if different from that of the issuer named below:

#### Avient Retirement Savings Plan
B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:

#### Avient Corporation

#### 33587 Walker Road

#### Avon Lake, Ohio 44012

#### Avient Retirement Savings Plan
<div align='center'>Table of Contents</div>

| Report of Independent Registered Public Accounting Firm                  |     |  1 |
| Audited Financial Statements                                             |     |    |
| Statements of Net Assets Available for Benefits                          |     |  3 |
| Statement of Changes in Net Assets Available for Benefits                |     |  4 |
| Notes to Financial Statements                                            |     |  5 |
| Supplemental Schedules                                                   |     |    |
| Schedule H, Line 4(a) – Schedule of Delinquent Participant Contributions |     | 11 |
| Schedule H, Line 4(i) – Schedule of Assets (Held at End of Year)         |     | 12 |
| Exhibit Index                                                            |     | 13 |
| Signature                                                                |     | 14 |

<div align='center'>Report of Independent Registered Public Accounting Firm</div>

To the Plan Administrator and Plan Participants

Avient Retirement Savings Plan

Avon Lake, Ohio

#### Opinion on the Financial Statements
We have audited the accompanying statements of net assets available for benefits of Avient Retirement Savings Plan (the “Plan”) as of December 31, 2024 and 2023, the related statement of changes in net assets available for benefits for the year ended December 31, 2024, and the related notes (