Company: ACCO
Filing Date: 2025-06-20
Form Type: 11-K
Source: 0000950170-25-088224
Chunk: 0

Company: ACCO BRANDS Corp
Filing Date: 2025-06-20
Form: 11-K
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

FORM 11-K

| x | 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 001-08454

| A. | Full title of the plan and the address of the plan, if different from that of the issuer named below: |

ACCO Brands Corporation 401(k) Plan

| B. | Name of issuer of the securities held pursuant to the plan and the address of its principal executive office: |

ACCO Brands Corporation Four Corporate Drive Lake Zurich, Illinois 60047

ACCO BRANDS CORPORATION 401(k) PLAN Financial Statements December 31, 2024 and 2023 TABLE OF CONTENTS

| Report of Independent Registered Public Accounting Firm          |  1 |
| Financial Statements:                                            |    |
| Statements of Net Assets Available for Benefits                  |  2 |
| Statement of Changes in Net Assets Available for Benefits        |  3 |
| Notes to Financial Statements                                    |  4 |
| Supplemental Schedule:                                           |    |
| Schedule H, Line 4(i) – Schedule of Assets (Held at End of Year) | 13 |
| Index to Exhibits                                                | 14 |
| Signatures                                                       | 15 |

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

Administrative Committee, Plan Participants and Plan Administrator

of the ACCO Brands Corporation 401(k) Plan

Lake Zurich, Illinois

Opinion on the Financial Statements

We have audited the accompanying statements of net assets available for benefits of the ACCO Brands Corporation 401(k) 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 (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 2024 and 2023, and the changes in net assets available for benefits for the