<SEC-DOCUMENT>0001292814-25-004323.txt : 20251219
<SEC-HEADER>0001292814-25-004323.hdr.sgml : 20251219
<ACCEPTANCE-DATETIME>20251218192027
ACCESSION NUMBER:		0001292814-25-004323
CONFORMED SUBMISSION TYPE:	6-K
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20251231
FILED AS OF DATE:		20251219
DATE AS OF CHANGE:		20251218

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NATIONAL STEEL CO
		CENTRAL INDEX KEY:			0001049659
		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL WORKS, BLAST FURNACES & ROLLING & FINISHING MILLS [3310]
		ORGANIZATION NAME:           	04 Manufacturing
		EIN:				000000000
		STATE OF INCORPORATION:			D5
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		6-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14732
		FILM NUMBER:		251584635

	BUSINESS ADDRESS:	
		ADDRESS IS A NON US LOCATION: 	YES
		STREET 1:		BRIGADEIRO FARIA LIMA AVENUE, 3400
		STREET 2:		ITAIM BIBI - 19/20 FLOOR
		CITY:			SAO PAULO
		NON US STATE TERRITORY:  	SAO PAULO
		PROVINCE COUNTRY:   	D5
		ZIP:			04538-132
		BUSINESS PHONE:		55 11 3049-7585

	MAIL ADDRESS:	
		ADDRESS IS A NON US LOCATION: 	YES
		STREET 1:		BRIGADEIRO FARIA LIMA AVENUE, 3400
		STREET 2:		ITAIM BIBI - 19/20 FLOOR
		CITY:			SAO PAULO
		NON US STATE TERRITORY:  	SAO PAULO
		PROVINCE COUNTRY:   	D5
		ZIP:			04538-132
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<DIV><FONT size=1></FONT>&nbsp;</DIV>

<DIV align=center><FONT color=#000000 size=5 face="Times New Roman"><B>SECURITIES AND EXCHANGE COMMISSION </B></FONT></DIV>

<DIV align=center><FONT color=#000000 size=3 face="Times New Roman"><B>Washington, D.C. 20549 </B></FONT></DIV>

<DIV><FONT size=1></FONT>&nbsp;</DIV>

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<DIV><FONT size=1></FONT>&nbsp;</DIV>

<DIV align=center><FONT color=#000000 size=5 face="Times New Roman"><B>FORM 6-K</B></FONT></DIV>

<DIV><FONT size=1></FONT>&nbsp;</DIV>

<DIV align=center><FONT color=#000000 size=3 face="Times New Roman">Report of Foreign Private Issuer<BR>Pursuant to Rule 13a-16 or 15d-16 of the</FONT></DIV>

<DIV align=center><FONT color=#000000 size=3 face="Times New Roman">Securities Exchange Act of 1934</FONT></DIV>

<DIV><FONT size=1></FONT>&nbsp;</DIV>

<DIV align=center>

<DIV STYLE="text-align: center"><FONT color=#000000 size=3 face="Times New Roman"><B>For the month of December, 2025</B></FONT></DIV><FONT color=#000000 size=3 face="Times New Roman"><B>Commission File Number 1-14732 </B></FONT></DIV>

<DIV><FONT size=1></FONT>&nbsp;</DIV>

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<DIV><FONT size=1></FONT>&nbsp;</DIV>

<DIV align=center><FONT color=#000000 size=5 face="Times New Roman"><B>COMPANHIA SIDER&#218;RGICA NACIONAL </B></FONT></DIV>

<DIV align=center><FONT color=#000000 size=2 face="Times New Roman">(Exact name of registrant as specified in its charter) </FONT></DIV>

<DIV><FONT size=1></FONT>&nbsp;</DIV>

<DIV align=center></DIV>

<DIV align=center><FONT color=#000000 size=5 face="Times New Roman"><B>National Steel Company </B></FONT></DIV>

<DIV align=center><FONT color=#000000 size=2 face="Times New Roman">(Translation of Registrant's name into English)</FONT></DIV>

<DIV><FONT size=1></FONT>&nbsp;</DIV>

<DIV align=center><FONT color=#000000 size=3 face="Times New Roman"><B>Av. Brigadeiro Faria Lima 3400, 20&#186; andar<BR>S&#227;o Paulo, SP, Brazil<BR>04538-132 </B></FONT></DIV>

<DIV align=center><FONT color=#000000 size=2 face="Times New Roman">(Address of principal executive office)</FONT></DIV>

<DIV><FONT size=1></FONT>&nbsp;</DIV>

<P></P>

<DIV align=center><FONT color=#000000 size=3 face="Times New Roman">Indicate by check mark whether the registrant files or will file annual reports<BR>under cover Form 20-F or Form 40-F.&nbsp;</FONT> Form 20-F ___X___ Form 40-F _______

<P>&nbsp;<FONT size=3 face="Times New Roman, Times, Serif">Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934. </FONT>&nbsp;</P>Yes _______ No ___X____ </DIV>

<P></P>


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<P STYLE="text-align: center; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0; text-align: center"><B>COMPANHIA SIDER&Uacute;RGICA NACIONAL</B></P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0; text-align: center">Publicly-held company</P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0; text-align: center">CNPJ/MF No. 33.042.730/0001-04</P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0; text-align: center">NIRE 35.300.396.090</P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0 0 8pt; text-align: center"><B>MATERIAL FACT</B></P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0 0 8pt">&nbsp;</P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0 0 8pt; text-align: justify">Companhia Sider&uacute;rgica Nacional
(&quot;<U>Company</U>&quot; or &quot;<U>CSN</U>&quot;) (B3: CSNA3; NYSE: SID), in compliance with article 157, paragraph 4, of Law No.
6,404/1976 and CVM Resolution No. 44/2021, hereby informs its shareholders and the market in general, following the notice to the market
dated November 18, 2025, that the Company's Board of Directors approved, on this date, the disposal of shares issued by the concessionaire
of rail transportation service MRS Log&iacute;stica S.A. (&quot;<U>MRS</U>&quot;), representing up to a total of 11.17% of the capital
stock of MRS on this date, held by the Company, to CSN Minera&ccedil;&atilde;o S.A. (&ldquo;<U>CMIN</U>&rdquo;), a Company's subsidiary,
being up to 974,851 common shares, 2,673,312 class A preferred shares and 34,092,604 class B preferred shares, all book-entry and with
no par value (&ldquo;<U>MRS Shares</U>&rdquo;), for the total price of up to R$ 3,350,000,000.00 (three billion, three hundred and fifty
million Brazilian reais) (&quot;<U>MRS Disposal</U>&quot;), to be consummated through two transactions.</P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0 0 8pt; text-align: justify">Therefore, the Share Purchase Agreement
and Other Covenants was executed, on this date, between CSN and CMIN, pursuant to which the Company disposed to CMIN of 974,851 common
shares, 2,673,312 class A preferred shares and 27,333,064 class B preferred shares issued by MRS, representing 9.17% of the capital stock
of MRS, held by CSN, upon payment at sight of the total price of R$ 2,750,000,031.80 (two billion, seven hundred and fifty million, thirty-one
Brazilian reais and eighty Brazilian cents) (&ldquo;<U>First Transaction</U>&rdquo;).</P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0 0 8pt; text-align: justify">Additionally, as part of the MRS Disposal,
it is already approved the additional sale of 6.759.540 class B preferred shares, representing 2% of the capital stock of MRS, upon payment
at sight of the total price of R$ 599,999,968.20 (five hundred and ninety-nine million, nine hundred and ninety-nine thousand, nine hundred
and sixty-eight Brazilian reais and twenty Brazilian centavos) (&ldquo;<U>Second Transaction</U>&rdquo;) to be completed subject to the
fulfillment of conditions customary for transactions of this nature, including the obtaining of the required legal approvals.</P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0 0 8pt; text-align: justify">With the conclusion of the Second Transaction,
CSN will own 25,636,431 common shares, representing 13.69% of MRS's voting capital stock, and no preferred shares issued by MRS. All common
shares held by CSN will remain subject to the MRS's Shareholders' Agreement, entered into on November 25, 1996, as amended on October
23, 2000, March 11, 2002, November 25, 2003 and January 09, 2018.</P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0 0 8pt; text-align: justify">CSN undertakes to keep its shareholders
and the market in general duly informed about any relevant developments related to the MRS Disposal, in accordance with the applicable
legislation.</P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0 0 8pt; text-align: center">S&atilde;o Paulo, December 18, 2025.</P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0 0 8pt; text-align: center">&nbsp;</P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0; text-align: center"><B>Antonio Marco Campos Rabello</B></P>

<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0; text-align: center">Chief Financial and Investor Relations Officer</P>




<P STYLE="font: 11pt/107% Calibri, Helvetica, Sans-Serif; margin: 0 0 8pt; text-align: center">Companhia Sider&uacute;rgica Nacional</P>



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<P STYLE="text-align: center; margin-top: 0; margin-bottom: 0">&nbsp;</P>

<P STYLE="text-align: center; margin-top: 0; margin-bottom: 0">&nbsp;</P>

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<DIV align=center><FONT color=#000000 size=3 face="Times New Roman">SIGNATURE </FONT></DIV>

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<DIV><FONT size=1></FONT>&nbsp;</DIV>

<DIV style="TEXT-INDENT: 4%"><FONT color=#000000 size=3 face="Times New Roman">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, thereunto duly authorized. </FONT></DIV>

<DIV style="TEXT-INDENT: 4%"><FONT color=#000000 size=3 face="Times New Roman">Date:&nbsp;December 18, 2025</FONT></DIV>

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   <DIV align=left><FONT color=#000000 size=3 face="Times New Roman">COMPANHIA SIDER&#218;RGICA NACIONAL </FONT></DIV></TD></TR>

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   <DIV align=left><FONT color=#000000 size=2 face="Times New Roman">By:</FONT></DIV></TD>

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   <DIV align=center><FONT color=#000000 size=2 face="Times New Roman">/<SMALL>S</SMALL>/&nbsp;Benjamin Steinbruch </FONT></DIV>

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   <DIV align=left><FONT color=#000000 size=2 face="Times New Roman"><B>Benjamin Steinbruch </B></FONT></DIV>

   <DIV align=left><FONT color=#000000 size=2 face="Times New Roman"><B>Chief Executive Officer <BR><BR></B></FONT></DIV></TD></TR></TABLE></DIV>

<P>&nbsp;</P>

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   <DIV align=left><FONT color=#000000 size=2 face="Times New Roman">By:</FONT></DIV></TD>

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   <DIV align=center><FONT color=#000000 size=2 face="Times New Roman">/<SMALL>S</SMALL>/&nbsp;Antonio Marco Campos Rabello </FONT></DIV>

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   <DIV align=left><FONT color=#000000 size=2 face="Times New Roman"><B>Antonio Marco Campos Rabello</B></FONT></DIV>

   <DIV align=left><FONT color=#000000 size=2 face="Times New Roman"><B>Chief Financial and Investor Relations Officer<BR><BR></B></FONT></DIV></TD></TR></TABLE></DIV>

<DIV>&nbsp;</DIV>

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<DIV align=center><FONT color=#000000 size=3 face="Times New Roman"><B>FORWARD-LOOKING STATEMENTS </B></FONT></DIV>

<P align=justify><FONT size=2 face="Times New Roman, Times, Serif">This press release may contain forward-looking statements. These statements are statements that are not historical facts, and are based on management's current view and estimates of future economic circumstances, industry conditions, company performance and financial results. The words "anticipates", "believes", "estimates", "expects", "plans" and similar expressions, as they relate to the company, are intended to identify forward-looking statements. Statements regarding the declaration or payment of dividends, the implementation of principal operating and financing strategies and capital expenditure plans, the direction of future operations and the factors or trends affecting financial condition, liquidity or results of operations are examples of forward-looking statements. Such statements reflect the current views of management and are subject to a number of risks and uncertainties. There is no guarantee that the expected events, trends or results will actually occur. The statements are based on many assumptions and factors, including general economic and market conditions, industry conditions, and operating factors. Any changes in such assumptions or factors could cause actual results to differ materially from current expectations. </FONT></P>

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