SONOCO PRODUCTS CO

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No. )

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

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Preliminary Proxy Statement

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Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

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Definitive Proxy Statement

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Definitive Additional Materials

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Soliciting Material under §240.14a-12

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Sonoco Products Company

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(Name of Registrant as Specified in Its Charter)

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(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

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No fee required.

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Fee paid previously with preliminary materials.

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Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

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1 North Second Street

Hartsville, South Carolina 29550 US

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LETTER FROM THE CHAIRMAN

OF OUR BOARD

TO OUR SHAREHOLDERS:

You are cordially invited to attend our Annual Meeting of Shareholders to be held at the Watson Theater, Coker University, 104 Campus Drive, Hartsville, South Carolina, on Wednesday, April 15, 2026, at 11:00 a.m. (Eastern Time).

We have enclosed a Notice of 2026 Annual Meeting of Shareholders and Proxy Statement that cover the details of matters to be presented at the meeting.

In addition to acting on the matters listed in the Notice of Annual Meeting of Shareholders, we will discuss the Company’s progress and you will be given an opportunity to ask questions of general interest to all shareholders.

We have also enclosed a copy of our 2025 Annual Report, which reviews the Company’s events of the past year and discusses strategy and the outlook for the future (or we delivered one copy of the Annual Report for all shareholders at your address).

We hope that you will come to the 2026 Annual Meeting of Shareholders in person; however, even if you plan to attend, we strongly encourage you to complete the enclosed proxy card or voting instruction form and return it in the enclosed business reply envelope. If you are a shareholder of record, you can also vote by telephone (if you live in the United States) or via the Internet. Instructions are shown on your proxy card. If you are a shareholder of record and for any reason you desire to revoke your proxy, you can do so at any time before the voting. Your vote is important and is greatly appreciated.

1 North Second Street

Hartsville, South Carolina 29550 US

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NOTICE OF 2026 ANNUAL MEETING

OF SHAREHOLDERS

MEETING INFORMATION

BALLOT PROPOSALS

VOTING

NOTICE OF 2026 ANNUAL MEETING OF SHAREHOLDERS

The enclosed proxy materials are being mailed on or about March 13, 2026, in connection with the solicitation by the Board of Directors of Sonoco Products Company of proxies to be used at the 2026 Annual Meeting of Shareholders (the “Annual Meeting”). We have enclosed a copy of the 2025 Annual Report or we have delivered a single copy of the Annual Report for all shareholders at your address. The Annual Report is not part of the proxy soliciting material.

It is important that your shares be represented and voted at the Annual Meeting. If you were a shareholder of record at the close of business on February 25, 2026, you can vote your shares electronically via the Internet, by telephone or by completing and returning the proxy card or voting instruction card if you requested paper proxy materials. Voting instructions are provided in the Notice of Internet Availability of Proxy Materials, or, if you requested printed materials, the instructions are printed on your proxy card and included in the accompanying proxy statement. You can revoke a proxy at any time prior to its exercise at the Annual Meeting by following the instructions in the proxy statement.

As a shareholder of record, you can elect to receive future Annual Reports and Proxy Statements electronically. Instructions are provided on the voting site if you vote via the Internet. Instructions also are provided if you electronically access your shareholder account, and you are not already receiving your Annual Meeting materials electronically. If you select electronic receipt, you will be notified via email by Continental Stock Transfer and Trust Company, our transfer agent, as to when the information will be available for your access. Your election to receive information electronically will remain in effect until you notify Continental Stock Transfer and Trust Company in writing (to Sonoco Products Company, c/o Continental Stock Transfer and Trust Company, 1 State Street Plaza, 30th Floor, New York, NY 10004 US) or by telephone (at 866-509-5584) that you wish to resume paper delivery by mail of these materials. If you own Sonoco shares through a broker, bank, or other nominee, please contact that institution regarding instructions about receiving Annual Meeting materials and other financial information electronically.