Company: THS
Filing Date: 2025-03-03
Form Type: PRER14A
Source: 0001320695-25-000014
Chunk: 1

Company: TreeHouse Foods, Inc.
Filing Date: 2025-03-03
Form: PRER14A
Chunk 1
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|                                           |     |           |     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            5 |     | Stockholder proposal to implement a simple majority vote requirement in our governance documents.                                                |     |                |     | FOR                       |     |             |     | Page78 |
|                                           |     |           |     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Stockholders may also act on any other business properly presented to the meeting. |     |                                                                                                                                                  |     |                |     |                           |     |             |     |        |

Similar to last year, we will conduct our 2025 Annual Meeting in a virtual format with no physical in-person meeting. Stockholders attending the virtual meeting will be afforded the same rights and opportunities to participate as they would at an in-person meeting. Stockholders can attend the 2025 Annual Meeting by visiting www.virtualshareholdermeeting.com/THS2025 where you will be able to listen to the meeting live, submit questions and vote.

This Notice of the 2025 Annual Meeting and Proxy Statement contain details of the business to be conducted at the upcoming Annual Meeting. For more information about registering to attend the Annual Meeting, please refer to the Summary of the Annual Meeting section in the accompanying proxy statement. On or about March 14, 2025, we will distribute our 2025 Proxy Statement (“Proxy Statement”), our 2024 Annual Report (“Annual Report”), and a proxy card to our stockholders.

On behalf of our Board, we thank you for your continued support and investment in TreeHouse Foods, Inc.

#### Kristy N. Waterman
EVP, Chief Human Resources Officer, General Counsel & Corporate Secretary

February 27, 2025

### IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS FOR THE
<div align='center'>ANNUAL MEETING OF STOCKHOLDERS TO BE HELD ON APRIL 24, 2025

Our proxy materials include this Proxy Statement, a proxy card and our Annual Report and are available free of charge at www.proxyvote.com.</div>

| Table of Contents |

| Proxy Statement Summary                                                |     |  1 |
| Environmental, Social and Governance                                   |     |  9 |
| Corporate Governance                                                   |     | 14 |
| Board Structure                                                        |     | 14 |
| Board Practices, Processes and Policies                                |     | 17 |
| The Board’s Role and Responsibilities                                  |