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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">UNITED STATES</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">SECURITIES AND EXCHANGE COMMISSION</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">Washington, D.C.&#160;&#160; 20549</div>

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<div style="FONT-SIZE: 14pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">FORM 8-K</div>

<div style="FONT-SIZE: 14pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">CURRENT REPORT</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">Date of Report (Date of the earliest event reported)</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">May 21, 2015</div>

<div style="FONT-SIZE: 18pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-VARIANT: small-caps; FONT-WEIGHT: bold; TEXT-ALIGN: center; MARGIN-TOP: 18pt">Kronos Worldwide, Inc.</div>

<div style="MARGIN-BOTTOM: 18pt; FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(Exact name of registrant as specified in its charter)</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">Delaware</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">1-31763</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">76-0294959</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(Commission</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">File Number)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(IRS Employer</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">Identification No.)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">5430 LBJ Freeway, Suite 1700, Dallas, Texas</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">75240-2697</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center; MARGIN-TOP: 12pt">Registrant's telephone number, including area code</div>

<div style="MARGIN-BOTTOM: 12pt; FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">(972) 233-1700</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: center">(Former name or former address, if changed since last report.)</div>
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<div style="MARGIN-BOTTOM: 12pt; FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left; MARGIN-TOP: 24pt">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):</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</div>
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<td style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; VERTICAL-ALIGN: top; FONT-WEIGHT: bold; WIDTH: 72pt; align: right">Item 1.01</td>
<td style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; VERTICAL-ALIGN: top; FONT-WEIGHT: bold; TEXT-ALIGN: left; WIDTH: auto">Entry into a Material Definitive Agreement.</td>
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<td style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; VERTICAL-ALIGN: top; FONT-WEIGHT: bold; WIDTH: 72pt; align: right">Item 2.03</td>
<td style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; VERTICAL-ALIGN: top; FONT-WEIGHT: bold; TEXT-ALIGN: left; WIDTH: auto">Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.</td>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify; TEXT-INDENT: 36pt">On May 21, 2015, the registrant, Deutsche Bank AG New York Branch ("<font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-STYLE: italic">DB</font>"), as administrative agent under the registrant's Credit Agreement dated as of February 18, 2014 ("<font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-STYLE: italic">Credit Agreement</font>"), and the lenders a party thereto entered into the First Amendment to Credit Agreement (the "<font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-STYLE: italic">First</font>&#160;<font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-STYLE: italic">Amendment</font>").&#160; At the time of the First Amendment, an aggregate $346,500,000.00 principal amount was outstanding under the Credit Agreement.&#160; As a result of the First Amendment:</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; COLOR: #000000; TEXT-ALIGN: left; MARGIN-LEFT: 72pt">(a)</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; COLOR: #000000; TEXT-ALIGN: justify; TEXT-INDENT: 72pt">the applicable margin on outstanding LIBOR-based borrowings under the Credit Agreement was reduced from 3.75% to 3.00%, and the applicable margin on outstanding Base Rate-based borrowings under the Credit Agreement was reduced from 2.75% to 2.00%; and</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; COLOR: #000000; TEXT-ALIGN: justify; TEXT-INDENT: 72pt">in the event the registrant elects to call all or any portion of the outstanding principal amount under the Credit Agreement, as amended, within six months of the effective date of the First Amendment, the registrant shall pay a call premium in the amount of 1.00% of the aggregate principal amount so prepaid.</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify; TEXT-INDENT: 36pt">The description herein of the First Amendment is qualified in its entirety, and the terms thereof are incorporated herein, by reference to the First Amendment to Credit Agreement dated May 21, 2015 among the registrant, Deutsche Bank AG New York Branch, as Administrative Agent, and the lenders a party thereto, filed as Exhibit 10.1 to this Form 8-K.</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify; TEXT-INDENT: 36pt">The First Amendment is incorporated herein by reference to provide information regarding its terms. The First Amendment is not intended to provide any other factual information about the matters covered therein.&#160; The First Amendment contains representations and warranties the parties thereto made to, and solely for, the benefit of each other and not for the benefit of any other party.&#160; Accordingly, investors and stockholders should not rely on those representations and warranties as characterizations of the actual state of the facts, since they were made only as of the date of the First Amendment and the closing, and may merely reflect agreed-upon allocation of risk among the parties to the First Amendment.&#160;&#160; Moreover, information concerning the subject matter of those representations and warranties may change subsequent to the date of the First Amendment or the closing.&#160;&#160;</div>

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<td style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; VERTICAL-ALIGN: top; FONT-WEIGHT: bold; TEXT-ALIGN: left; WIDTH: auto">Financial Statements and Exhibits.</td>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Exhibits</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">10.1</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">First Amendment to Credit Agreement dated May 21, 2015 among the registrant, Deutsche Bank AG New York Branch, as Administrative Agent, and the lenders a party thereto.</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left; TEXT-INDENT: 36pt">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="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-VARIANT: small-caps; FONT-WEIGHT: bold; TEXT-ALIGN: left">KRONOS WORLDWIDE, INC.</div>
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<div style="TEXT-ALIGN: left"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">By:</font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 5.22pt">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">&#160;</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">/s/ Gregory M. Swalwell</font></font></div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">Date:&#160; May 21, 2015</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-STYLE: italic; TEXT-ALIGN: left; MARGIN-LEFT: 26.1pt">Gregory M. Swalwell</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">INDEX TO EXHIBITS</div>

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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center">Item No.</div>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: left">First Amendment to Credit Agreement dated May 21, 2015 among the registrant, Deutsche Bank AG New York Branch, as Administrative Agent, and the lenders a party thereto.</div>
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C.   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 the earliest event reported)
May 21, 2015
Kronos Worldwide, Inc.
(Exact name of registrant as specified in its charter)
Delaware
1-31763
76-0294959
(State or other jurisdiction of incorporation)
(Commission
File Number)
(IRS Employer
Identification No.)
5430 LBJ Freeway, Suite 1700, Dallas, Texas
75240-2697
(Address of principal executive offices)
(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 communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 1.01
Entry into a Material Definitive Agreement.
Item 2.03
Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.
On May 21, 2015, the registrant, Deutsche Bank AG New York Branch ("
DB
"), as administrative agent under the registrant's Credit Agreement dated as of February 18, 2014 ("
Credit Agreement
"), and the lenders a party thereto entered into the First Amendment to Credit Agreement (the "
First
Amendment
").  At the time of the First Amendment, an aggregate $346,500,000.00 principal amount was outstanding under the Credit Agreement.  As a result of the First Amendment:
(a)
the applicable margin on outstanding LIBOR-based borrowings under the Credit Agreement was reduced from 3.75% to 3.00%, and the applicable margin on outstanding Base Rate-based borrowings under the Credit Agreement was reduced from 2.75% to 2.00%; and
(b)
in the event the registrant elects to call all or any portion of the outstanding principal amount under the Credit Agreement, as amended, within six months of the effective date of the First Amendment, the registrant shall pay a call premium in the amount of 1.00% of the aggregate principal amount so prepaid.
The description herein of the First Amendment is qualified in its entirety, and the terms thereof are incorporated herein, by reference to the First Amendment to Credit Agreement dated May 21, 2015 among the registrant, Deutsche Bank AG New York Branch, as Administrative Agent, and the lenders a party thereto, filed as Exhibit 10.1 to this Form 8-K.
The First Amendment is incorporated herein by reference to provide information regarding its terms. The First Amendment is not intended to provide any other factual information about the matters covered therein.  The First Amendment contains representations and warranties the parties thereto made to, and solely for, the benefit of each other and not for the benefit of any other party.  Accordingly, investors and stockholders should not rely on those representations and warranties as characterizations of the actual state of the facts, since they were made only as of the date of the First Amendment and the closing, and may merely reflect agreed-upon allocation of risk among the parties to the First Amendment.   Moreover, information concerning the subject matter of those representations and warranties may change subsequent to the date of the First Amendment or the closing.
Item 9.01
Financial Statements and Exhibits.
(d)
Exhibits
Item No.
Exhibit Index
10.1
First Amendment to Credit Agreement dated May 21, 2015 among the registrant, Deutsche Bank AG New York Branch, as Administrative Agent, and the lenders a party thereto.
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)
By:
/s/ Gregory M. Swalwell
Date:  May 21, 2015
Gregory M. Swalwell
Executive Vice President and
Chief Financial Officer
INDEX TO EXHIBITS
Item No.
Exhibit Index
10.1
First Amendment to Credit Agreement dated May 21, 2015 among the registrant, Deutsche Bank AG New York Branch, as Administrative Agent, and the lenders a party thereto.