Company: KRO
Filing Date: 2025-03-25
Form Type: DEF 14A
Source: 0001257640-25-000009
Chunk: 64

Company: KRONOS WORLDWIDE INC
Filing Date: 2025-03-25
Form: DEF 14A
Chunk 64
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 extent allowed by applicable law, the agents will vote in their discretion on any substitute director nominee and other matter that may properly come before the Meeting and any adjournment or postponement thereof.

<div align='center'>PLEASE SIGN, DATE AND MAIL THIS PROXY CARD PROMPTLY IN THE ENCLOSED ENVELOPE.

SEE REVERSE SIDE.

PLEASE DETACH ALONG PERFORATED LINE AND MAIL IN THE ENVELOPE PROVIDED.

Important Notice Regarding the Availability of Proxy Materials for theAnnual Stockholder Meeting to Be Held on May 14, 2025.

The proxy statement and annual report to stockholders(including Kronos Worldwide’s Annual Report on

Form 10-K for the fiscal year ended December 31, 2024) are available athttps://web.viewproxy.com/KronosWorldwide/2025.</div>

| ​The Board recommends a vote FOR all nominees listed and FOR Proposal 2. |     | PLEASE MARK YOUR VOTE IN BLUE 
 OR BLACK INK AS SHOWN HERE    | ⌧ |

1. Director Nominees:

| ​                      | FOR | WITHHOLD |   | ​                        | FOR | WITHHOLD |
| 01 – James M. Buch     | ◻   | ◻        | ​ | 05 – Meredith W. Mendes  | ◻   | ◻        |
| 02 – Loretta J. Feehan | ◻   | ◻        | ​ | 06 – Cecil H. Moore, Jr. | ◻   | ◻        |
| 03 – John E. Harper    | ◻   | ◻        | ​ | 07 – Michael S. Simmons  | ◻   | ◻        |
| 04 – Kevin B. Kramer   | ◻   | ◻        | ​ | 08 – R. Gerald Turner    | ◻   | ◻        |
| ​                      | ​   | ​        | ​ | ​                        | ​   | ​        |

| ​                                                                                                    | ​ | ​ | ​ |                                                                                                                                                                                                                                                                                                                                                                                    |                |      | ​ |
| 2. Nonbinding advisory vote approving named executive officer compensation.◻ FOR ◻ AGAINST ◻ ABSTAIN |   |   |   | 3. In their discretion, the proxies are authorized to vote upon such other business as may properly come before the Meeting and any adjournment or postponement thereof.                                                                                                                                                                                                           |                |      |