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    <div style="text-align: center; margin-top: 4.4pt; font-family: 'Times New Roman', Times, serif; font-size: 18pt; font-weight: bold;">UNITED STATES</div>

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    <div style="text-align: center; margin-top: 13.2pt; font-family: 'Times New Roman', Times, serif; font-size: 12pt; font-weight: bold;">CURRENT REPORT</div>

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    <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 8pt;">&#160;</div>

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            <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</div>
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    <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 8pt;">&#160;</div>

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            <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">&#160;</div>
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    <td style="width: 4%; vertical-align: top;">
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    <td style="width: 92%; vertical-align: top;">
            <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">Pre-commencement communication pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</div>
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    <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 8pt;">&#160;</div>

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            <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">&#160;</div>
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    <td style="width: 4%; vertical-align: top;">
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    <td style="width: 92%; vertical-align: top;">
            <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">Pre-commencement communication pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</div>
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    <div style="text-align: left; margin-top: 18pt; margin-bottom: 6pt; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">Securities registered pursuant to Section 12(b) of the Act:</div>

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      <div style="text-align: justify; margin-top: 12pt; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17
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    <div style="text-align: justify; margin-top: 12pt; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for
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    <div><br />
    </div>

    <div style="text-align: left; text-indent: 36pt; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">On December 16, 2021, James W. Brown, executive vice president of the registrant, provided notice to the registrant of his retirement,
      effective as of December 31, 2021, as an officer of the registrant.&#160; In connection with his retirement as an officer of the registrant, Mr. Brown also provided notice to the registrant&#8217;s affiliate Valhi, Inc. (&#8220;Valhi&#8221;) of his retirement as an officer
      of Valhi as of December 31, 2021.</div>

    <div><br />
    </div>

    <div style="text-align: left; text-indent: 36pt; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">As previously reported by the registrant, Mr. Brown retired as chief financial officer of the registrant and Valhi as of June 1, 2021.</div>

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    <div style="text-align: center; font-family: 'Times New Roman', Times, serif; font-size: 10pt; font-weight: bold;">SIGNATURE</div>

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    </div>

    <div><br />
    </div>

    <div style="text-align: justify; text-indent: 36pt; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its
      behalf by the undersigned hereunto duly authorized.</div>

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            <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 10pt; font-variant: small-caps; font-weight: bold;">KRONOS WORLDWIDE, INC.</div>
          </td>

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    <td style="width: 47.41%; vertical-align: top;">&#160;</td>

    <td style="width: 52.59%; vertical-align: top;" colspan="2">
            <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">(Registrant)</div>
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    <td style="width: 52.59%; vertical-align: top;" colspan="2">&#160;</td>

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    <td style="width: 52.59%; vertical-align: top;" colspan="2">&#160;</td>

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    <td style="width: 52.59%; vertical-align: top;" colspan="2">&#160;</td>

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    <td style="width: 52.59%; vertical-align: top;" colspan="2">&#160;</td>

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    <td style="width: 47.41%; vertical-align: top;">
            <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">Date:&#160; December 21, 2021</div>
          </td>

    <td style="width: 5.37%; vertical-align: top;">
            <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">By:</div>
          </td>

    <td style="width: 47.22%; vertical-align: top; border-bottom: #000000 2px solid;">
            <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 10pt;">/s/ Tim C. Hafer</div>
          </td>

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    <td style="width: 5.37%; vertical-align: top;">&#160;</td>

    <td style="width: 47.22%; vertical-align: top;">
            <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 10pt; font-style: italic;">Tim C. Hafer,</div>
            <div style="text-align: left; font-family: 'Times New Roman', Times, serif; font-size: 10pt; font-style: italic;">Senior Vice President and Chief Financial Officer</div>
          </td>

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{"company-data": {"conformed-name": "KRONOS WORLDWIDE INC", "cik": "0001257640", "assigned-sic": "2810", "irs-number": "760294959", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-31763", "film-number": "211509439"}, "business-address": {"street1": "5430 LBJ FREEWAY", "street2": "SUITE 1700", "city": "DALLAS", "state": "TX", "zip": "75240-2620", "phone": "9722331700"}, "mail-address": {"street1": "5430 LBJ FREEWAY", "street2": "SUITE 1700", "city": "DALLAS", "state": "TX", "zip": "75240-2620"}, "former-company": {"former-conformed-name": "KRONOS INC", "date-changed": "20030730"}}
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
FORM
8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934
Date of report (Date of earliest event reported):
December 16, 2021
Kronos Worldwide, Inc.
(Exact Name of Registrant as Specified in Charter)
Delaware
1-31763
76-0294959
(State or Other Jurisdiction
of Incorporation)
(Commission
File Number)
(I.R.S. Employer
Identification No.)
5430 LBJ Freeway
,
Suite 1700
,
Dallas
,
Texas
75240-2620
(Address of Principal Executive Offices, and Zip Code)
Registrant's Telephone Number, Including Area Code
(
972
)
233-1700
(Former Name or Former Address, if Changed Since Last
        Report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant
      under any of the following provisions (
see
General Instruction A.2.):
☐
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐
Pre-commencement communication pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐
Pre-commencement communication pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of the Act:
Title of each class
Trading Symbol(s)
Name of each exchange on which registered
Common Stock
KRO
New York Stock Exchange
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17
        CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).
Emerging growth company
☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for
      complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.
☐
Item 5.02
Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.
On December 16, 2021, James W. Brown, executive vice president of the registrant, provided notice to the registrant of his retirement,
      effective as of December 31, 2021, as an officer of the registrant.  In connection with his retirement as an officer of the registrant, Mr. Brown also provided notice to the registrant's affiliate Valhi, Inc. ("Valhi") of his retirement as an officer
      of Valhi as of December 31, 2021.
As previously reported by the registrant, Mr. Brown retired as chief financial officer of the registrant and Valhi as of June 1, 2021.
SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its
      behalf by the undersigned hereunto duly authorized.
KRONOS WORLDWIDE, INC.
(Registrant)
Date:  December 21, 2021
By:
/s/ Tim C. Hafer
Tim C. Hafer,
Senior Vice President and Chief Financial Officer