# EDGAR Filing Document

**Accession Number:** 0000712034
**File Stem:** 0001193125-26-285461
**Filing Date:** 2026-6
**Character Count:** 42448
**Document Hash:** 20fb6f666b410db7cd13f74b4161652c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-285461.hdr.sgml**: 20260626

**ACCESSION NUMBER**: 0001193125-26-285461

**CONFORMED SUBMISSION TYPE**: 11-K

**PUBLIC DOCUMENT COUNT**: 34

**CONFORMED PERIOD OF REPORT**: 20251231

**FILED AS OF DATE**: 20260626

**DATE AS OF CHANGE**: 20260626

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ACCO BRANDS Corp
- **CENTRAL INDEX KEY:** 0000712034
- **STANDARD INDUSTRIAL CLASSIFICATION:** BLANKBOOKS, LOOSELEAF BINDERS & BOOKBINDING & RELATED WORK [2780]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 362704017
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 11-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-08454
- **FILM NUMBER:** 261129240

**BUSINESS ADDRESS:**
- **STREET 1:** FOUR CORPORATE DRIVE
- **CITY:** LAKE ZURICH
- **STATE:** IL
- **ZIP:** 60047
- **BUSINESS PHONE:** 847-541-9500

**MAIL ADDRESS:**
- **STREET 1:** FOUR CORPORATE DRIVE
- **CITY:** LAKE ZURICH
- **STATE:** IL
- **ZIP:** 60047

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ACCO BRANDS CORP
- **DATE OF NAME CHANGE:** 20050817

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ACCO WORLD CORP
- **DATE OF NAME CHANGE:** 19830106

?xml version='1.0' encoding='ASCII'? 11-K

[**<u>**Table of Contents**</u>**](#toc_page)

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM** 11-K

⌧ **ANNUAL REPORT PURSUANT TO SECTION 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934** 

**For the fiscal year ended** **December 31,** 2025

**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**

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[**<u>**Table of Contents**</u>**](#toc_page)

**ACCO BRANDS CORPORATION 401(k) PLAN**

**Financial Statements**

**December 31, 2025 and 2024**

**<u>**TABLE OF CONTENTS**</u>**

---

| | |
|:---|:---|
| &nbsp;&nbsp;[<u>Report of Independent Registered Public Accounting Firm</u>](#report_of_independent_accounting_firm) | &nbsp;&nbsp;[<u>1</u>](#report_of_independent_accounting_firm) |
| &nbsp;&nbsp;Financial Statements: |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[<u>Statements of Net Assets Available for Benefits</u>](#net_assets_available_benefits) | &nbsp;&nbsp;[<u>2</u>](#net_assets_available_benefits) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[<u>Statement of Changes in Net Assets Available for Benefits</u>](#changes_net_assets_available_benefits) | &nbsp;&nbsp;[<u>3</u>](#changes_net_assets_available_benefits) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[<u>Notes to Financial Statements</u>](#notes_to_financial_statements) | &nbsp;&nbsp;[<u>4</u>](#notes_to_financial_statements) |
| &nbsp;&nbsp;Supplemental Schedule: |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[<u>Schedule H, Line 4(i) – Schedule of Assets (Held at End of Year)</u>](#schedule_h_line_4i) | &nbsp;&nbsp;[<u>13</u>](#schedule_h_line_4i) |
| &nbsp;&nbsp;[<u>Index to Exhibits</u>](#index_to_exhibits) | &nbsp;&nbsp;[<u>14</u>](#index_to_exhibits) |
| &nbsp;&nbsp;[<u>Signatures</u>](#signatures) | &nbsp;&nbsp;[<u>15</u>](#signatures) |

---

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[**<u>**Table of Contents**</u>**](#toc_page)

Report of Independent Registered Public Accounting Firm

Administrative Committee, Plan Participants and Plan Administrator

&nbsp;&nbsp;&nbsp;&nbsp;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, 2025 and 2024, the related statement of changes in net assets available for benefits for the year ended December 31, 2025, 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, 2025 and 2024, and the changes in net assets available for benefits for the year ended December 31, 2025, in conformity with accounting principles generally accepted in the United States of America.

**Basis for Opinion**

These financial statements are the responsibility of the Plan's management. Our responsibility is to express an opinion on the Plan's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) ("PCAOB") and are required to be independent with respect to the Plan in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Plan's internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

**Supplemental Information**

The supplemental Schedule H, Line 4(i) – Schedule of Assets (Held at End of Year) as of December 31, 2025 has been subjected to audit procedures performed in conjunction with the audit of the Plan's financial statements. The supplemental schedule is the responsibility of the Plan's management. Our audit procedures included determining whether the information presented in the supplemental schedule reconciles to the financial statements or the underlying accounting and other records, as applicable, and performing procedures to test the completeness and accuracy of the information presented in the supplemental schedule. In forming our opinion on the supplemental schedule, we evaluated whether the supplemental schedule, including its form and content, is presented in conformity with the Department of Labor's Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. In our opinion, the supplemental schedule is fairly stated in all material respects in relation to the financial statements as a whole.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/Crowe LLP

We have served as the Plan's auditor since 2005.

Chicago, Illinois

June 26, 2026

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[**<u>**Table of Contents**</u>**](#toc_page)

**ACCO BRANDS CORPORATION 401(K) PLAN**

**Statements of Net Assets Available for Benefits**

**December 31, 2025 and 2024**

---

| | | |
|:---|:---|:---|
|  | **December 31,** | **December 31,** |
|  | **2025** | **2024** |
| **Assets** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Investments, at fair value | $362961322 | $349914502 |
| &nbsp;&nbsp;&nbsp;&nbsp;Investments, at contract value | 24904776 | 26700887 |
| &nbsp;&nbsp;&nbsp;&nbsp;Receivables: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Employer contribution | 52359 | 83199 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Employee contribution |  | 17026 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Notes receivable from participants | 4489995 | 5023073 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total receivables | 4542354 | 5123298 |
| **Net Assets Available for Benefits** | $392408452 | $381738687 |

---

See accompanying notes to financial statements

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[**<u>**Table of Contents**</u>**](#toc_page)

**ACCO BRANDS CORPORATION 401(K) PLAN**

**Statement of Changes in Net Assets Available for Benefits**

**Year Ended December 31, 2025**

---

| | |
|:---|:---|
| **Additions to net assets attributed to:** |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Investment income: |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Dividend and interest income | $9416746 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net appreciation in fair value of investments | 44272353 |
| &nbsp;&nbsp;&nbsp;&nbsp;Interest income on notes receivables from participants | 346210 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Contributions: |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Participant | 9351582 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Employer | 5969353 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rollovers | 161652 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total contributions | 15482587 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total additions | 69517896 |
| **Deductions from net assets attributed to:** |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Benefits paid to participants | 58623603 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Administrative fees and other | 224528 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total deductions | 58848131 |
| **Net increase** | 10669765 |
| **Net assets available for benefits:** |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Beginning of year | 381738687 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;End of year | $392408452 |

---

See accompanying notes to financial statements

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[**<u>**Table of Contents**</u>**](#toc_page)

**ACCO BRANDS CORPORATION 401(K) PLAN**

**Notes to Financial Statements**

**December 31, 2025 and 2024**

------

**NOTE 1. Description of the Plan**

The following description of the ACCO Brands Corporation 401(k) Plan ("the Plan") is provided for general information purposes only. For a complete description of the Plan, participants should refer to the specific provisions of the Plan document or to the Prospectus/Summary Plan Description, each of which is available from the plan administrator at Four Corporate Drive, Lake Zurich, Illinois 60047.

<u>General</u>: ACCO Brands Corporation ("the Company" or "ACCO") established the Plan as of August 16, 2005, in order to provide for participation by certain employees of ACCO who are paid on a salaried, hourly or commission basis. Generally, all employees of the Company are immediately eligible to participate in the Plan. In connection with the closure of the Sidney, New York location on October 18, 2024, Sidney Union Employees are no longer eligible to participate in the Plan, effective as of the closure of that facility.

The Plan is a defined contribution plan. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974 ("ERISA"). Fidelity Management Trust Company serves as trustee of the Plan and performs certain record keeping and administrative functions for the Plan.

<u>Significant features of the Plan are as follows</u>:

<u>Contributions</u>: Each participant may elect to contribute on a pre-tax basis up to 50% of eligible compensation. A participant's pre-tax contributions may not exceed the dollar amount provided by the Internal Revenue Code ("the Code"), which was $23,500 for 2025.

The Plan also permits each participant to make after-tax contributions, including Roth 401(k) contributions, to the Plan. However, total pre-tax and after-tax contributions generally may not exceed 50% of the participant's total eligible compensation.

Generally, participants over 50 years of age may elect up to 25% of eligible compensation as either an additional pre-tax catch-up contribution or Roth 401(k) catch-up contribution, which was limited by the Code to $7,500 in 2025. In accordance with Securing a Strong Retirement Act 2.0 ("SECURE 2.0"), a participant who attains ages 60 to 63 may make an enhanced "super" catch-up contribution equal to the greater of $10,000 or 150% of the regular catch-up contribution limitation. After-tax contributions and catch-up contributions shall not exceed 75% of eligible compensation.

In addition to the ability to make simultaneous tax deferred and after-tax contributions, the Plan also allows for a participant's contributions to automatically continue on an after-tax basis once the pre-tax contribution limit has been reached for that year. Participants, who elect to continue contributing to the Plan on an after-tax basis, will contribute at the same pre-tax contribution percentage that was in effect when the limit was reached for that year. In determining the amount of pre-tax and after-tax contributions allowed under the Plan, annual compensation limits are imposed by the Code.

(continued)

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[**<u>**Table of Contents**</u>**](#toc_page)

**ACCO BRANDS CORPORATION 401(K) PLAN**

**Notes to Financial Statements**

**December 31, 2025 and 2024**

------

New hires who do not decline enrollment in the Plan within 90 days after first becoming eligible to join the Plan, will be automatically enrolled in the Plan and a pre-tax contribution of 6% will be deducted from the participant's pay and invested in the T. Rowe Price Retirement fund designed for the participant's age group.

The Company contributes on behalf of each eligible participant, an amount equal to 100% of the participant's contribution up to 6% of eligible compensation. The amount of any Company matching contributions is subject to certain limitations of the Code. In 2010, the Plan became a safe harbor 401(k) plan.

The Plan permits the acceptance of an account balance from another tax-qualified plan or certain individual retirement accounts by means of a direct rollover.

<u>Participant Accounts</u>: Each participants account is credited with the participant's contributions, allocated Company contributions, and allocated investment income (loss), and is reduced administrative expenses and participant withdrawals. Allocations are based on participant earnings or account balances, as defined. The benefit to which a participant is entitled is the benefit that can be provided from the participant's vested balance.

<u>Investment Elections</u>: Participants may direct the investment of their accounts among the investment options offered by the Plan. Subject to Plan policies (including restrictions on excessive short-term trading and blackout periods), participants may change their investment elections and transfer all or a portion of their account balances among available funds on a daily basis. The Plan currently offers, in addition to the ACCO Brands Common Stock Fund, a Fully Benefit-Responsive Synthetic Guaranteed Investment Contract (the "SGIC"), and various other collective investment and mutual funds as investment options for participants. Participants can also make investments outside those offered under the Plan and allocate their assets over a potentially wider array of investment options through a self-directed brokerage account. Those investment options include, but are not limited to, common stock, mutual funds, and cash.

<u>Vesting</u>: Participants are always 100% vested in their own contributions as well as any investment earnings on those contributions. Company safe harbor and non-safe harbor matching contributions, as well as any investment earnings on those contributions, are 100% vested immediately.

<u>Notes Receivable from Participants</u>: The current minimum amount a participant can borrow is $1,000 for a principal residence loan and $500 for a general-purpose loan. The maximum amount a participant may borrow is the lesser of (1) an amount which, when added to the highest outstanding balance under the Plan loans during the previous 12 months, does not exceed $50,000, or (2) one-half of the participant's vested account balances.

The term of any loan shall not exceed five years, unless the loan is related to the purchase of the participant's principal residence. Principal residence loans must be repaid within ten years. Participants can have up to three loans outstanding at any one time, one of which may be a principal residence loan.

Each loan bears a rate of interest equal to the prime rate as reported by Thomson Reuters, as of the last business day of the month prior to the month in which the loan is made. Each loan must be collateralized by a portion of the participant's account balance and documented by a promissory note payable to the trustee, which is invested in the loan fund. Repayment is made by payroll deductions for so long as the participant is employed by the Company and

(continued)

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[**<u>**Table of Contents**</u>**](#toc_page)

**ACCO BRANDS CORPORATION 401(K) PLAN**

**Notes to Financial Statements**

**December 31, 2025 and 2024**

------

thereafter by regular installment payments. Loan repayments are invested in accordance with the participant's investment election in effect at the time of repayment. A one-time loan setup fee of $50 is paid by the participant and is deducted from the participant's account at the time the loan is processed.

<u>Distributions and Withdrawals</u>: Benefits are payable from a participant's account under the Plan's provisions, upon a participant's death, retirement or other termination of employment in a lump sum or in installment payments. The Plan also permits withdrawals to be made by participants who have incurred a "hardship" as defined in the Plan. In addition, certain in-service withdrawals are permitted pursuant to Secure 2.0, including those for emergency personal expenses, domestic abuse victims and disaster relief, as well as withdrawals after attainment of age 59½.

<u>Administrative Expenses</u>: Investment management expenses incurred by the Plan are netted against earnings prior to allocation to participant accounts. Transaction charges (for loan and certain benefit payment transactions), short-term trading fees and certain record-keeper fees are paid by the Plan by reducing the balances of those participants initiating the transactions. Fees incurred in the administration of the Plan, such as audit fees, legal fees and investment advisory fees, have been paid by the Plan.

<u>Plan Termination</u>: Although it has expressed no intent to do so, the Company has the right under the Plan to discontinue its contributions at any time and the Board of Directors of the Company may terminate the Plan at any time subject to the provisions of ERISA and its related regulations.

**NOTE 2. Summary of Significant Accounting Policies**

<u>Basis of Accounting</u>: The accompanying financial statements of the Plan have been prepared on the accrual basis of accounting.

<u>Investment Valuation and Income Recognition</u>: The Plan's investments are stated at fair value (see Note 3), other than the SGIC, which is presented at contract value (see Note 6).

Contract value represents contributions made to the contract, plus earnings, less participant withdrawals and administrative expenses. Participants in fully benefit-responsive contracts may ordinarily direct the withdrawal or transfer of all or a portion of their investment at contract value. The Plan holds a direct interest in such contracts through its investment in the SGIC.

Dividend income is recorded on the ex-dividend date. Interest income is recorded on an accrual basis. Purchases and sales of securities are recorded on a trade-date basis. Net appreciation (depreciation) includes the Plan's gains and losses on investments bought and sold as well as held during the year.

<u>Use of Estimates</u>: The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires the Plan's management to make estimates and assumptions that affect certain amounts reported in the financial statements and disclosures, and actual results could differ from those estimates.

<u>Risks and Uncertainties</u>: The Plan invests in mutual funds, collective investment funds, the SGIC, and Company common stock. Investment options for the self-directed brokerage accounts include, but are not limited to, common

(continued)

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[**<u>**Table of Contents**</u>**](#toc_page)

**ACCO BRANDS CORPORATION 401(K) PLAN**

**Notes to Financial Statements**

**December 31, 2025 and 2024**

------

stock, mutual funds, and cash. These investments are exposed to various risks, such as interest rate, liquidity, market, and credit risks. Due to the level of risk associated with certain investments and the sensitivity of certain fair value estimates to changes in valuation assumptions, it is at least reasonably possible that changes in the values of investments will occur in the near term and that such changes could materially affect the amounts reported in the Statement of Net Assets Available for Benefits and participants' individual account balances.

<u>Payments of Benefits</u>: Benefits are recorded when paid.

<u>Notes Receivable from Participants</u>: Notes receivable from participants are reported at their unpaid principal balance plus any accrued but unpaid interest, with no allowance for credit losses, as repayments of principal and interest are generally received through payroll deductions and the notes are collateralized by the participants' account balances.

**NOTE 3. Investment Valuation Measurements**

Fair value is the price that would be received by the Plan for an asset or paid by the Plan to transfer a liability (an exit price) in an orderly transaction between market participants on the measurement date in the Plan's principal or most advantageous market for the asset or liability. Fair value measurements are determined by maximizing the use of observable inputs and minimizing the use of unobservable inputs when measuring fair value. The hierarchy places the highest priority on unadjusted quoted market prices in active markets for identical assets or liabilities (level 1 measurements) and gives the lowest priority to unobservable inputs (level 3 measurements). The three levels of inputs within the fair value hierarchy are defined as follows:

Level 1: Quoted prices (unadjusted) of identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date.

Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

Level 3: Significant unobservable inputs that reflect a reporting entity's own assumptions about the assumptions that market participants would use in pricing an asset or liability.

In some cases, a valuation technique used to measure fair value may include inputs from multiple levels of the fair value hierarchy. The lowest level of significant input determines the placement of the entire fair value measurement in the hierarchy.

The following descriptions of the valuation methods and assumptions used by the Plan to estimate the fair value of investments apply to investments held directly by the Plan.

*Mutual funds and common stock*: The fair values of mutual funds and common stock investments are determined by obtaining quoted prices on nationally recognized securities exchanges (level 1 inputs).

(continued)

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[**<u>**Table of Contents**</u>**](#toc_page)

**ACCO BRANDS CORPORATION 401(K) PLAN**

**Notes to Financial Statements**

**December 31, 2025 and 2024**

------

*Self-directed brokerage accounts:* These accounts provide the opportunity to invest in a broad range of investment options including, but not limited to, common stock, mutual funds, and cash. The fair values of investments in common stock and mutual funds are determined by obtaining quoted prices on nationally recognized securities exchanges (level 1 inputs).

*Collective investment funds:* The fair values of the Plan's interest in the collective investment funds (the "CIFs") are based upon the net asset value ("NAV") of investments. The per unit NAV of the CIFs are calculated at the end of each day that the New York Stock Exchange or the NASDAQ are open as of the close of regular trading depending on the CIF. Contributions to and withdrawals from the CIFs are based on the NAV per unit as calculated at the end of each day.

Participant-directed withdrawals may be made at any time without penalty, regardless of their frequency or amount, however participant-directed withdrawals may not be transferred to a competing fund for 90 days after withdrawal. A competing fund is an investment option available under the Plan that is primarily comprised of high-quality fixed income securities.

The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the Plan believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

The following tables set forth by level, within the fair value hierarchy, the Plan's assets as of December 31, 2025 and 2024 that are measured at fair value on a recurring basis:

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Fair Value Measurements** | **Fair Value Measurements** | **Fair Value Measurements** | **Fair Value Measurements** |
|  | **as of December 31, 2025** | **as of December 31, 2025** | **as of December 31, 2025** | **as of December 31, 2025** |
| **Description** | **Level 1** | **Level 2** | **Level 3** | **Total** |
| Mutual funds | $121450854 | $— | $— | $121450854 |
| Company stock | 1224536 |  |  | 1224536 |
| Self-directed brokerage accounts | 3473631 |  |  | 3473631 |
| Investments measured at net asset value:<sup>(1)</sup> |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Collective investment funds |  |  |  | 236812301 |
| Total assets in the fair value hierarchy | $126149021 | $— | $— | $362961322 |

---

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Fair Value Measurements** | **Fair Value Measurements** | **Fair Value Measurements** | **Fair Value Measurements** |
|  | **as of December 31, 2024** | **as of December 31, 2024** | **as of December 31, 2024** | **as of December 31, 2024** |
| **Description** | **Level 1** | **Level 2** | **Level 3** | **Total** |
| Mutual funds | $159103464 | $— | $— | $159103464 |
| Company stock | 1749759 |  |  | 1749759 |
| Self-directed brokerage accounts | 2986779 |  |  | 2986779 |
| Investments measured at net asset value:<sup>(1)</sup> |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Collective investment funds |  |  |  | 186074500 |
| Total assets in the fair value hierarchy | $163840002 | $— | $— | $349914502 |

---

(1)Certain investments that are measured at fair value using the net asset value per share practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in these tables are intended to permit reconciliation of the fair value hierarchy to the line "Investments, at fair value" presented in the Statements of Net Assets Available for Benefits.

(continued)

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[**<u>**Table of Contents**</u>**](#toc_page)

**ACCO BRANDS CORPORATION 401(K) PLAN**

**Notes to Financial Statements**

**December 31, 2025 and 2024**

------

**NOTE 4. Tax Status**

The Internal Revenue Service (the "IRS") has determined and informed the Company by letter dated September 26, 2013 that the Plan is designed in accordance with applicable sections of the Internal Revenue Code (the "Code").

Although the Plan has been amended since receiving the determination letter, Plan management believes that the Plan is designed and being operated in compliance with the applicable requirements of the Code. Therefore, no provision for income taxes has been included in the Plan's financial statements.

Accounting principles generally accepted in the U. S. require plan management to evaluate tax positions taken by the Plan and recognize a tax liability if the Plan has taken an uncertain position that more likely than not would not be sustained upon examination by the Department of Labor or the IRS. The plan administrator has analyzed the tax positions taken by the Plan, and has concluded that as of December 31, 2025 and 2024, there are no uncertain positions taken or expected to be taken that would require recognition of a liability (or asset) or disclosure in the financial statements. The Plan is subject to routine audits by taxing jurisdictions; however, there are currently no audits for any tax periods in progress. The plan administrator believes it is no longer subject to income tax examinations for years prior to 2022.

**NOTE 5. Party-in-Interest Transactions**

Parties-in-interest are defined under Department of Labor regulations as any fiduciary of the Plan, any party rendering service to the Plan, the employer and certain others.

Certain Plan investments are shares of registered investment companies (mutual funds) managed by Fidelity Investments, an affiliate of Fidelity Management Trust Company. Fidelity Management Trust Company is the trustee as defined by the Plan. Accordingly, these investments qualify as party-in-interest investments. Professional fees and administrative fees paid by the Plan in 2025 also qualify as party-in-interest transactions. The investment in ACCO Brands Corporation common stock ("ACCO stock"), including dividends, is also a party-in-interest investment. As of December 31, 2025 and 2024, the value of the ACCO stock held by the Plan within the ACCO Brands Common Stock Fund was $1,222,525 and $1,747,813, respectively, and the number of shares held was 327,755 and 332,917, respectively.

Participants in the Plan are permitted to borrow funds from their vested balance as described in "Note 1. Description of the Plan." These transactions qualify as party-in-interest transactions. Actual fees paid by the Plan for investment advisory and consulting services, also qualify as party-in-interest transactions and are included in administrative expenses in the accompanying financial statements.

**NOTE 6. Fully Benefit-Responsive Synthetic Guaranteed Investment Contract**

The Plan holds a SGIC, which consists of units of participation in the Prudential Core Intermediate Bond Fund (a collective trust fund, the "Collective Trust") managed by Prudential Trust Company and a wrapper contract issued by Prudential Insurance Company of America (the "Wrapper").

(continued)

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**ACCO BRANDS CORPORATION 401(K) PLAN**

**Notes to Financial Statements**

**December 31, 2025 and 2024**

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Participants may ordinarily direct the withdrawal or transfer of all or a portion of their investments from the SGIC at contract value due to the contract value guarantee provided to the Plan under the Wrapper. There are no reserves against the contract value for credit risk of the issuer or otherwise.

There are no events that limit the ability of the Plan to transact at contract value as long as the contract remains in force. The investment contract does specify events, which may result in a termination. Such events include Plan termination or merger, early retirement incentive, layoffs, etc. Termination of the contract would cause distributions to be payable at fair value. In addition, Prudential may not cause the contract to be terminated at an amount other than contract value. Currently, management believes that the occurrence of an event that would cause the Plan to transact contract distributions at less than contract value is not probable.

The crediting interest rate of the contract is based upon an agreed-upon formula with the issuer, as defined in the contract agreement, but cannot be less than zero. The interest rates are reviewed on a semi-annual basis and are updated per the contract. The key factors that influence future interest crediting rates could include the following: the level of market interest rates; the amount and timing of participant contributions; transfers and withdrawals into/out of the contracts; and the duration of the underlying investments backing the contracts**.**

The fair value of the Wrapper is based upon a comparison of the cost of the Wrapper and current re-bid prices for a similar wrapper contract as of the financial statement date (level 3 inputs). The value of the Wrapper was determined to be zero as of December 31, 2025 and 2024.

**NOTE 7. Reconciliation of Financial Statements to Form 5500**

The following is a reconciliation of net assets available for benefits per the financial statements compared to the Form 5500:

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| | | |
|:---|:---|:---|
|  | **December 31,** | **December 31,** |
|  | **2025** | **2024** |
| Net assets available for benefits per financial statements | $392408452 | $381738687 |
| Deemed distributions for participant loans | (155595) | (217820) |
| &nbsp;&nbsp;&nbsp;&nbsp;Net assets available for benefits per the Form 5500 | $392252857 | $381520867 |

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| | |
|:---|:---|
|  | **Year Ended** |
|  | **December 31, 2025** |
| Increase in net assets available for benefits per the financial statements | $10669765 |
| Deemed distribution of participant loans at end of year | (155595) |
| Deemed distribution of participant loans at beginning of year | 217820 |
| Net income per the Form 5500 | $10731990 |

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**NOTE 8. Subsequent Events**

Plan management has evaluated subsequent events for recognition and disclosure through June 26, 2026, the date these financial statements were issued, and has determined, that other than plan amendments effective January 1, 2026 described below, that no events have occurred subsequent to December 31, 2025 that would require recognition or disclosure in the financial statements.

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**ACCO BRANDS CORPORATION 401(K) PLAN**

**Notes to Financial Statements**

**December 31, 2025 and 2024**

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Effective January 1, 2026, in accordance with the requirements of Section 603 of SECURE 2.0, any participant whose prior-year wages exceed $150,000 must designate catch-up and super-catch-up contributions as Roth elective deferrals. Additionally, the Company contributes on behalf of each eligible participant, an amount equal to 100% of the participant's contribution up to 4% of eligible compensation.

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**SUPPLEMENTAL SCHEDULE**

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ACCO BRANDS CORPORATION 401(K) PLAN

Schedule H, Line 4(i) - Schedule of Assets (Held at End of Year)

December 31, 2025

Name of plan sponsor: ACCO Brands Corporation

Employer identification number: 36-2704017

Three-digit plan number: 002

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| | | | | |
|:---|:---|:---|:---|:---|
|  |  | (c) |  |  |
|  | (b) | Description of Investment |  |  |
|  | Identity of Issue, | Including Maturity Date, |  | (e) |
|  | Borrower, Lessor | Rate of Interest, Collateral, | (d) | Current |
| (a) | or Similar Party | Par or Maturity Value | Cost | Value |
|  |  | **<u>Mutual Funds</u>** |  |  |
|  | Columbia | Columbia Small Cap Value Fund II I3 | \*\* | $3782453 |
|  | Dimensional Fund Advisors | DFA Global Real Estate Securities Portfolio | \*\* | 208414 |
|  | Dodge & Cox | Dodge & Cox International Stock Fund | \*\* | 1193999 |
| \* | Fidelity Investments | Fidelity Contrafund Class K6 | \*\* | 48585839 |
| \* | Fidelity Investments | Fidelity Emerging Markets Fund Class K | \*\* | 1693679 |
| \* | Fidelity Investments | Fidelity Global ex U.S. Index Fund | \*\* | 1837205 |
| \* | Fidelity Investments | Fidelity Government Money Market Fund | \*\* | 1575 |
| \* | Fidelity Investments | Fidelity Mid Cap Index Fund | \*\* | 1735594 |
| \* | Fidelity Investments | Fidelity Small Cap Growth K6 Fund | \*\* | 11088222 |
| \* | Fidelity Investments | Fidelity Small Cap Index Fund | \*\* | 789838 |
| \* | Fidelity Investments | Fidelity U.S. Bond Index Fund | \*\* | 2287282 |
|  | Hartford | Hartford Strategic Income Fund Class R6 | \*\* | 1355217 |
|  | PIMCO | PIMCO Total Return Fund Institutional Class | \*\* | 6403181 |
|  | PIMCO | PIMCO Commodity Real Return Strategy Fund Institutional Class | \*\* | 395458 |
|  | T. Rowe Price | T. Rowe Price Capital Appreciation Fund I Class | \*\* | 29783190 |
|  | T. Rowe Price | T. Rowe Price Value Fund I Class | \*\* | 3967048 |
|  | Vanguard | Vanguard International Growth Fund Admiral Shares | \*\* | 6342660 |
|  |  | **<u>Collective Investment Funds</u>** |  |  |
|  | Northern Trust | NT S&P 500 Index | \*\* | 41859113 |
|  | T. Rowe Price | T. Rowe Price Retirement Balanced Trust (Class F) | \*\* | 1958580 |
|  | T. Rowe Price | T. Rowe Price Retirement 2005 Trust (Class F) | \*\* | 1472197 |
|  | T. Rowe Price | T. Rowe Price Retirement 2010 Trust (Class F) | \*\* | 1498958 |
|  | T. Rowe Price | T. Rowe Price Retirement 2015 Trust (Class F) | \*\* | 2955226 |
|  | T. Rowe Price | T. Rowe Price Retirement 2020 Trust (Class F) | \*\* | 6665075 |
|  | T. Rowe Price | T. Rowe Price Retirement 2025 Trust (Class F) | \*\* | 23761138 |
|  | T. Rowe Price | T. Rowe Price Retirement 2030 Trust (Class F) | \*\* | 41273580 |
|  | T. Rowe Price | T. Rowe Price Retirement 2035 Trust (Class F) | \*\* | 37580250 |
|  | T. Rowe Price | T. Rowe Price Retirement 2040Trust (Class F) | \*\* | 27766835 |
|  | T. Rowe Price | T. Rowe Price Retirement 2045 Trust (Class F) | \*\* | 21895485 |
|  | T. Rowe Price | T. Rowe Price Retirement 2050 Trust (Class F) | \*\* | 12783196 |
|  | T. Rowe Price | T. Rowe Price Retirement 2055 Trust (Class F) | \*\* | 9957514 |
|  | T. Rowe Price | T. Rowe Price Retirement 2060 Trust (Class F) | \*\* | 5385154 |
|  |  | **<u>Fully Benefit-Responsive Synthetic Investment Contract</u>** |  |  |
|  | Prudential Ins. Co. of America | Wrapper contract #GA-62068 | \*\* |  |
|  | Prudential Trust Company | Core Intermediate Bond Fund | \*\* | 24904776 |
|  |  | **<u>Common Stock</u>** |  |  |
| \* | ACCO Brands Corporation | ACCO Brands Common Stock | \*\* | 1224536 |
|  |  | **<u>Self-Directed Brokerage Accounts</u>** |  |  |
| \* | Securities Held by Fidelity | Various | \*\* | 3473631 |
|  |  | **<u>Participant Loans</u>** |  |  |
| \* | Participant Loans | 3.25% - 9.00%, various maturity dates (latest maturity date July 31, 2035) | \*\* | 4334400 |
|  |  |  |  | $392200498 |

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\* Denotes party-in-interest.

\*\* Participant-directed investment, cost basis disclosure not required.

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**INDEX TO EXHIBITS**

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| | |
|:---|:---|
| &nbsp;&nbsp;**Exhibit Number** | &nbsp;&nbsp;**Description** |
| &nbsp;&nbsp;23.1 | &nbsp;&nbsp;[<u>Consent of Independent Registered Public Accounting Firm - Crowe LLP\*</u>](acco-ex23_1.htm) |

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\* Filed herewith

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**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the Committee, which administers the Plan has duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized.

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| | | | |
|:---|:---|:---|:---|
|  |  | ACCO Brands Corporation 401(k) Plan | ACCO Brands Corporation 401(k) Plan |
| Date: | June 26, 2026 | By: | /s/ James M. Dudek, Jr. |
|  |  |  | James M. Dudek, Jr. |
|  |  |  | Senior Vice President, Corporate Controller and Chief Accounting Officer |

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## Exhibit 23.1

**Exhibit 23.1**

**CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM**

We consent to the incorporation by reference in Registration Statements No. 333-157726 and No. 333-127626 on Form S-8 of ACCO Brands Corporation of our report dated June 26, 2026 appearing in this Annual Report on Form 11-K of ACCO Brands Corporation 401(k) Plan for the year ended December 31, 2025.

/s/Crowe LLP

Chicago, Illinois

June 26, 2026

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