Company: ACCO
Filing Date: 2025-03-28
Form Type: DEFA14A
Source: 0000950170-25-046401
Chunk: 1

Company: ACCO BRANDS Corp
Filing Date: 2025-03-28
Form: DEFA14A
Chunk 1
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 e-mail copies of your proxy materials are provided on the reverse side of this Notice. STOCKHOLDERS ARE CORDIALLY INVITED TO ATTEND THE ANNUAL MEETING.

The Securities and Exchange Commission rules permit us to make our proxy materials availab le to our stockholders via the Internet. Material for this annual meeting and future meetings may be requested by one of the following methods:

| INTERNET  | To view your proxy materials online, go to https://web.viewproxy.com/ACCO/2025. Have your    11-digit Virtual Control Number (located below) available when you access the website and follow the instructions.                                                                                                     |
| TELEPHONE | Call 1-877-777-2857        TOLL FREE                                                                                                                                                                                                                                                                                |
| E-MAIL    | By e-mail at: requests@viewproxy.com* If requesting material by e-mail, please send a blank e-mail with the company name and your 11-digit Virtual Control Number (located below) in the subject line. No other requests, instructions, or other inquiries should be included with your e-mail requesting material. |

You must use the 11-digit Virtual Control Number located in the box below.

| VIRTUAL CONTROL NUMBER |

<div align='center'>ACCO BRANDS CORPORATIONFour Corporate Drive
Lake Zurich, IL 60047

PROXY MATERIALS AVAILABLE TO VIEW OR RECEIVE

The following proxy materials are available to you for review at:https://web.viewproxy.com/ACCO/2025</div>

Proxy Statement

2024 Annual Report on Form 10-K

<div align='center'>ACCESSING YOUR PROXY MATERIALS ONLINE

Have this notice available when you request a paper copy of the proxy materials or
to vote your proxyelectronically.

You must reference your Virtual Control Number to vote by Internet or
request a paper copy of the proxy materials.

You may vote your proxy when you view the material on the Internet.
You will be asked to follow the prompts to vote yourshares.

Your electronic vote authorizes the named proxies to vote your shares in the same manner as if you marked, signed, dated, and returned the proxy card.

REQUESTING A PAPER COPY OF THE PROXY MATERIALS

By telephone please call 1-877-777-2857
or
By logging ontohttps://web.viewproxy.com/ACCO/2025or
By e-mail at:requests@viewproxy.com

Please include the company name and your Virtual Control Number in the e-mail subject line.</