Company: KRO
Filing Date: 2025-03-25
Form Type: DEF 14A
Source: 0001257640-25-000009
Chunk: 63

Company: KRONOS WORLDWIDE INC
Filing Date: 2025-03-25
Form: DEF 14A
Chunk 63
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, at Kronos Worldwide, Inc., Three Lincoln Centre, 5430 LBJ Freeway, Suite 1700, Dallas, Texas 75240-2620, or call her at972.233.1700.

| ​ | ​                      |
| ​ | Kronos Worldwide, Inc. |
| ​ | ​                      |
| ​ | Dallas, Texas          |
| ​ | March 25, 2025         |

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#### Kronos Worldwide, Inc.Three Lincoln Centre5430 LBJ Freeway, Suite 1700Dallas, Texas 75240-2620​​
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<div align='center'>KRONOS WORLDWIDE, INC.

PROXY SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS OF KRONOS WORLDWIDE, INC.FOR THE ANNUAL MEETING OF STOCKHOLDERS—MAY 14, 2025</div>

The undersigned hereby appoints Michael S. Simmons, Jane R. Grimm and Tim C. Hafer, and each of them, proxy for the undersigned, with full power of substitution, to vote on behalf of the undersigned at the 2025 Annual Meeting of Stockholders (the“Meeting”) of Kronos Worldwide, Inc., a Delaware corporation (“Kronos Worldwide”), to be held at Three Lincoln Centre Conference Center, 5430 LBJ Freeway, Suite 350, Dallas, Texas 75240-2620 on Wednesday, May 14, 2025, at 10:00 a.m. (local time), and at any adjournment or postponement of the Meeting, all of the shares of common stock, par value $0.01 per share, of Kronos Worldwide standing in the name of the undersigned or that the undersigned may be entitled to vote on the proposals set forth, and in the manner directed, on this proxy card.

THIS PROXY AUTHORIZATION MAY BE REVOKED AS SET FORTH IN THE PROXY STATEMENT THAT ACCOMPANIED THIS PROXY CARD.

The agents named on this proxy card, if this card is properly executed, will vote in the manner directed on this card. If this card is properly executed but no direction is given with respect to the election of one or more nominees named on the reverse side of this card or proposal 2 (Say-on-Pay), the agents will vote“FOR”each such nominee for election as a director and“FOR”proposal 2. To the