Company: KRO
Filing Date: 2025-03-31
Form Type: DEFA14A
Source: 0000059255-25-000013
Chunk: 0

Company: KRONOS WORLDWIDE INC
Filing Date: 2025-03-31
Form: DEFA14A
Chunk 0
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<div align='center'>**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**</div>

| Filed by Registrant:                        | ý |
| Filed by a Party other than the Registrant: | ☐ |

<div align='center'>**Check the appropriate box: ☐ Preliminary Proxy Statement**</div>

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

<div align='center'>**☐ Definitive Proxy Statement**</div>

| ý | Definitive Additional Materials |

| ☐ | Soliciting Material Pursuant to § 240.14a‑12 |

<div align='center'>**Kronos Worldwide, Inc. (Name of Registrant as Specified in Its Charter) (Name of Person(s) Filing Proxy Statement, if other than the Registrant) Payment of Filing Fee (Check the appropriate box):**</div>

| ý | No fee required.                                                                                     |
| ☐ | Fee paid previously with preliminary materials.                                                      |
| ☐ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11. |

Important Notice Regarding the Internet Availability of Proxy Materials for the Annual Meeting of Stockholders to be held on May 14, 2025 5430 LBJ Freeway, Suite 350, Dallas, Texas 75240-2620

STOCKHOLDERS ARE CORDIALLY INVITED TO ATTEND THE ANNUAL MEETING AND VOTE IN PERSON. To the Stockholders of Kronos Worldwide: Notice is hereby given that the Annual Meeting of Stockholders of Kronos Worldwide, Inc. will be held on May 14, 2025 at Three Lincoln Centre Conference Center, 5430 LBJ Freeway, Suite 350, Dallas,Texas 75240-2620 for the following purposes:

| 1. | Director Nominees: |

| 01 – James M. Buch      | 02 – Loretta J. Feehan   | 03 – John E. Harper     | 04 – Kevin B. Kramer  |
| 05 – Meredith W. Mendes | 06 – Cecil H. Moore, Jr. |