<SEC-DOCUMENT>0001171843-23-006686.txt : 20231103
<SEC-HEADER>0001171843-23-006686.hdr.sgml : 20231103
<ACCEPTANCE-DATETIME>20231102173814
ACCESSION NUMBER:		0001171843-23-006686
CONFORMED SUBMISSION TYPE:	SC 13D/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20231103
DATE AS OF CHANGE:		20231102
GROUP MEMBERS:		ROCCA & PARTNERS STICHTING ADMINISTRATIEKANTOOR AANDELEN SAN FAUSTIN
GROUP MEMBERS:		TECHINT HOLDINGS S.A R.L.

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			TENARIS SA
		CENTRAL INDEX KEY:			0001190723
		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL WORKS, BLAST FURNACES  ROLLING MILLS (COKE OVENS) [3312]
		IRS NUMBER:				000000000

	FILING VALUES:
		FORM TYPE:		SC 13D/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-78699
		FILM NUMBER:		231373794

	BUSINESS ADDRESS:	
		STREET 1:		26, BOULEVARD ROYAL, 4TH FLOOR
		CITY:			LUXEMBOURG
		STATE:			N4
		ZIP:			L-2449
		BUSINESS PHONE:		1-888-300-5432

	MAIL ADDRESS:	
		STREET 1:		26, BOULEVARD ROYAL, 4TH FLOOR
		CITY:			LUXEMBOURG
		STATE:			N4
		ZIP:			L-2449

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SAN FAUSTIN S.A.
		CENTRAL INDEX KEY:			0001429586
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			N4
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A

	BUSINESS ADDRESS:	
		STREET 1:		26, BOULEVARD ROYAL, GROUND FLOOR
		CITY:			LUXEMBOURG
		STATE:			N4
		ZIP:			L-2449
		BUSINESS PHONE:		(352) 2720-9600

	MAIL ADDRESS:	
		STREET 1:		26, BOULEVARD ROYAL, GROUND FLOOR
		CITY:			LUXEMBOURG
		STATE:			N4
		ZIP:			L-2449

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	San Faustin N.V.
		DATE OF NAME CHANGE:	20080312
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D/A
<SEQUENCE>1
<FILENAME>sc13da_110223.htm
<DESCRIPTION>FORM SC 13D/A
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>UNITED STATES</B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>SECURITIES AND EXCHANGE COMMISSION</B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>WASHINGTON, D.C. 20549</B></P>

<P STYLE="font-size: 10pt; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font-size: 10pt; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font-size: 10pt; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>SCHEDULE 13D</B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>Under the Securities Exchange Act of 1934</B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>(Amendment No. 5)*</B></P>

<P STYLE="font-size: 10pt; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0; border-bottom: Black 0.5pt solid">Tenaris S.A.</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">(Name of Issuer)</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0; border-bottom: Black 0.5pt solid">Ordinary Shares, $1.00 par value per share</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">(Title of Class of Securities)</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT STYLE="font-size: 10pt">88031
M 10 9</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">(CUSIP Number)</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<DIV STYLE="padding: 0in 0in 1pt; border-bottom: Black 0.5pt solid">

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">Fernando J. Mantilla, 26, Boulevard Royal, Ground Floor, L-2449 Luxembourg,
Grand-Duchy of Luxembourg</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">Telephone: +352 27209600</P>

</DIV>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">(Name, Address and Telephone number of Person Authorized to</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">Receive Notices and Communications)</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0; border-bottom: black 0.5pt solid">November 2<SUP>nd</SUP>, 2023</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">(Date of Event Which Requires Filing of this Statement)</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">If the filing person has previously filed a statement on Schedule 13G to
report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of &sect;&sect;240.13d&ndash;1(e),
240.13d&ndash;1(f) or 240.13d&ndash;1(g), check the following box. &#9744;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">Note: Schedules filed in paper format shall include a signed original and
five copies of the schedule, including all exhibits. See Rule 13d&ndash;7 for other parties to whom copies are to be sent.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which
would alter disclosures provided in a prior cover page.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">The information required on the remainder of this cover page shall not
be deemed to be &ldquo;filed&rdquo; for the purpose of section 18 of the Securities Exchange Act of 1934 (&ldquo;Act&rdquo;) or otherwise
subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: justify"></P>

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    <DIV STYLE="margin-top: 6pt; margin-bottom: 6pt; border-bottom: Black 4pt solid"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font-size: 10pt"><TR STYLE="vertical-align: top; text-align: left"><TD STYLE="width: 33%">&nbsp;</TD><TD STYLE="width: 34%; text-align: center">Page <!-- Field: Sequence; Type: Arabic; Name: PageNo -->1<!-- Field: /Sequence --> of 14</TD><TD STYLE="width: 33%; text-align: right">&nbsp;</TD></TR></TABLE></DIV>
    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: justify">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 35%; font-size: 10pt; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-top: Black 1pt dotted; width: 100%; border-bottom: Black 1pt dotted">
    <P STYLE="font-size: 10pt; margin: 0pt 0"></P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">CUSIP NO. 88031 M 10 9</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">&nbsp;</P></TD></TR>
  </TABLE>
<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0; text-indent: 0.5in; border-bottom: Black 0.5pt dashed">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">1.</TD><TD>NAMES OF REPORTING PERSONS</TD></TR></TABLE>

<P STYLE="font-size: 10pt; text-indent: -0.5in; margin: 0pt 0 0pt 0.5in">&nbsp;</P>

<P STYLE="font-size: 10pt; text-indent: 0in; margin: 0pt 0 0pt 0.5in">ROCCA &amp; PARTNERS STICHTING ADMINISTRATIEKANTOOR AANDELEN SAN
FAUSTIN</P>

<P STYLE="font-size: 10pt; text-indent: -0.5in; margin: 0pt 0 0pt 0.5in">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0 0pt 0.5in">I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-indent: 0.5in; margin: 0pt 0">00-0000000</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; border-top: Black 0.5pt dashed"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">2.</TD><TD>CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)</TD></TR></TABLE>

<P STYLE="font-size: 10pt; text-indent: 4.5in; margin: 0pt 0">(a) [&nbsp; &nbsp;]</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-indent: 4.5in; margin: 0pt 0">(b) [&nbsp; &nbsp;]</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SEC USE ONLY</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SOURCE OF FUNDS
(SEE INSTRUCTIONS):</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-indent: 35.4pt; margin: 0pt 0">N/A</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
TO &#9;ITEMS 2(d) OR 2(e): [ ]</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CITIZENSHIP OR PLACE OF ORGANIZATION</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; text-indent: 0.5in">THE NETHERLANDS</P>

<!-- Field: Rule-Page --><DIV STYLE="margin-top: 1pt; margin-bottom: 1pt; width: 100%"><DIV STYLE="font-size: 1pt; border-top: Black 0.5pt dashed">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font-size: 10pt; border-collapse: collapse">
  <TR>
    <TD ROWSPAN="4" STYLE="text-align: center; vertical-align: middle; width: 23%">
    <P STYLE="margin: 0pt 0; font-size: 10pt">NUMBER OF</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">SHARES</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">BENEFICIALLY</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">OWNED BY</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">EACH</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">REPORTING</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">PERSON</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">WITH:</P></TD>
    <TD STYLE="vertical-align: top; width: 77%">
    <P STYLE="font-size: 10pt; margin: 0pt 0">7.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER: 0</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&#9;</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>
    <P STYLE="font-size: 10pt; margin: 0pt 0">8.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER: 713,605,187</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&#9;</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>
    <P STYLE="font-size: 10pt; margin: 0pt 0">9.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER: 0</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&#9;</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>
    <P STYLE="font-size: 10pt; margin: 0pt 0">10.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER: 713,605,187</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P></TD></TR>
  </TABLE>
<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">11.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AGGREGATE AMOUNT
BENEFICIALLY OWNED BY EACH REPORTING</P>

<P STYLE="margin: 0pt; font-size: 10pt; text-indent: 0.48in">PERSON: 713,605,187</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">12.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CHECK BOX IF THE
AGGREGATE AMOUNT IN ROW (11) EXCLUDES</P>

<P STYLE="margin: 0pt; font-size: 10pt; text-indent: 0.48in">CERTAIN SHARES (SEE INSTRUCTIONS)</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; text-indent: 4.5in">[&nbsp; &nbsp;]</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">13.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW&nbsp;(11): 60.4%</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<DIV STYLE="padding: 1pt 0in; border-top: Black 0.5pt dashed; border-bottom: Black 0.5pt dashed">

<P STYLE="font-size: 10pt; margin: 0pt 0">14.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;TYPE OF REPORTING PERSON (SEE INSTRUCTIONS): HC</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

</DIV>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="margin: 0pt 0; font-size: 10pt"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 35%; font-size: 10pt; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-top: Black 1pt dotted; width: 100%; border-bottom: Black 1pt dotted">
    <P STYLE="font-size: 10pt; margin: 0pt 0"></P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">CUSIP NO. 88031 M 10 9</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">&nbsp;</P></TD></TR>
  </TABLE>
<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0; text-indent: 0.5in; border-bottom: Black 0.5pt dashed">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">1.</TD><TD>NAMES OF REPORTING PERSONS</TD></TR></TABLE>

<P STYLE="font-size: 10pt; text-indent: -0.5in; margin: 0pt 0 0pt 0.5in">&nbsp;</P>

<P STYLE="font-size: 10pt; text-indent: 0in; margin: 0pt 0 0pt 0.5in">SAN FAUSTIN S.A.</P>

<P STYLE="font-size: 10pt; text-indent: -0.5in; margin: 0pt 0 0pt 0.5in">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0 0pt 0.5in">I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-indent: 0.5in; margin: 0pt 0">00-0000000</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; border-top: Black 0.5pt dashed"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">2.</TD><TD>CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)</TD></TR></TABLE>

<P STYLE="font-size: 10pt; text-indent: 4.5in; margin: 0pt 0">(a) [&nbsp; &nbsp;]</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-indent: 4.5in; margin: 0pt 0">(b) [&nbsp; &nbsp;]</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SEC USE ONLY</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SOURCE OF FUNDS
(SEE INSTRUCTIONS):</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-indent: 35.4pt; margin: 0pt 0">N/A</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
TO &#9;ITEMS 2(d) OR 2(e): [ ]</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CITIZENSHIP OR PLACE OF ORGANIZATION</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; text-indent: 0.5in">GRAND DUCHY OF LUXEMBOURG</P>

<!-- Field: Rule-Page --><DIV STYLE="margin-top: 1pt; margin-bottom: 1pt; width: 100%"><DIV STYLE="font-size: 1pt; border-top: Black 0.5pt dashed">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font-size: 10pt; border-collapse: collapse">
  <TR>
    <TD ROWSPAN="4" STYLE="text-align: center; vertical-align: middle; width: 23%">
    <P STYLE="margin: 0pt 0; font-size: 10pt">NUMBER OF</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">SHARES</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">BENEFICIALLY</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">OWNED BY</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">EACH</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">REPORTING</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">PERSON</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">WITH:</P></TD>
    <TD STYLE="vertical-align: top; width: 77%">
    <P STYLE="font-size: 10pt; margin: 0pt 0">7.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER: 0</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&#9;</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>
    <P STYLE="font-size: 10pt; margin: 0pt 0">8.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER: 713,605,187</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&#9;</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>
    <P STYLE="font-size: 10pt; margin: 0pt 0">9.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER: 0</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&#9;</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>
    <P STYLE="font-size: 10pt; margin: 0pt 0">10.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER: 713,605,187</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P></TD></TR>
  </TABLE>
<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">11.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AGGREGATE AMOUNT
BENEFICIALLY OWNED BY EACH REPORTING</P>

<P STYLE="margin: 0pt; font-size: 10pt; text-indent: 0.48in">PERSON: 713,605,187</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">12.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CHECK BOX IF THE
AGGREGATE AMOUNT IN ROW (11) EXCLUDES</P>

<P STYLE="margin: 0pt; font-size: 10pt; text-indent: 0.48in">CERTAIN SHARES (SEE INSTRUCTIONS)</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; text-indent: 4.5in">[&nbsp; &nbsp;]</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">13.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW&nbsp;(11): 60.4%</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<DIV STYLE="padding: 1pt 0in; border-top: Black 0.5pt dashed; border-bottom: Black 0.5pt dashed">

<P STYLE="font-size: 10pt; margin: 0pt 0">14.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;TYPE OF REPORTING PERSON (SEE INSTRUCTIONS): CO</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

</DIV>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

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<P STYLE="margin: 0pt 0; font-size: 10pt">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 35%; font-size: 10pt; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-top: Black 1pt dotted; width: 100%; border-bottom: Black 1pt dotted">
    <P STYLE="font-size: 10pt; margin: 0pt 0"></P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">CUSIP NO. 88031 M 10 9</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">&nbsp;</P></TD></TR>
  </TABLE>
<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0; text-indent: 0.5in; border-bottom: Black 0.5pt dashed">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">1.</TD><TD>NAMES OF REPORTING PERSONS</TD></TR></TABLE>

<P STYLE="font-size: 10pt; margin: 0pt 0 0pt 0.5in">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; text-indent: 0.5in">TECHINT HOLDINGS S.&Agrave; R.L.</P>

<P STYLE="font-size: 10pt; margin: 0pt 0 0pt 0.5in">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0 0pt 0.5in">I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-indent: 0.5in; margin: 0pt 0">00-0000000</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt; border-top: Black 0.5pt dashed"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">2.</TD><TD>CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)</TD></TR></TABLE>

<P STYLE="font-size: 10pt; text-indent: 4.5in; margin: 0pt 0">(a) [&nbsp; &nbsp;]</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-indent: 4.5in; margin: 0pt 0">(b) [&nbsp; &nbsp;]</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SEC USE ONLY</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<DIV STYLE="padding: 1pt 0in 0in; border-top: Black 0.5pt dashed">

<P STYLE="font-size: 10pt; margin: 0pt 0">4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SOURCE OF FUNDS (SEE INSTRUCTIONS):</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

</DIV>

<P STYLE="font-size: 10pt; margin: 0pt 0; text-indent: 0.5in">N/A</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
TO &#9;ITEMS 2(d) OR 2(e): [ ]</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CITIZENSHIP OR PLACE OF ORGANIZATION</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; text-indent: 0.5in">GRAND DUCHY OF LUXEMBOURG</P>

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<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font-size: 10pt; border-collapse: collapse">
  <TR>
    <TD ROWSPAN="4" STYLE="text-align: center; vertical-align: middle; width: 23%">
    <P STYLE="margin: 0pt 0; font-size: 10pt">NUMBER OF</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">SHARES</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">BENEFICIALLY</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">OWNED BY</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">EACH</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">REPORTING</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">PERSON</P>
    <P STYLE="margin: 0pt 0; font-size: 10pt">WITH:</P></TD>
    <TD STYLE="vertical-align: top; width: 77%">
    <P STYLE="font-size: 10pt; margin: 0pt 0">7.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER: 713,605,187</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&#9;</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>
    <P STYLE="font-size: 10pt; margin: 0pt 0">8.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER:</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&#9;</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>
    <P STYLE="font-size: 10pt; margin: 0pt 0">9.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER: 713,605,187</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&#9;</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>
    <P STYLE="font-size: 10pt; margin: 0pt 0">10.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER:</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P></TD></TR>
  </TABLE>
<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">11.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AGGREGATE AMOUNT
BENEFICIALLY OWNED BY EACH REPORTING</P>

<P STYLE="margin: 0pt; font-size: 10pt; text-indent: 0.48in">PERSON: 713,605,187</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">12.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CHECK BOX IF THE
AGGREGATE AMOUNT IN ROW (11) EXCLUDES</P>

<P STYLE="margin: 0pt; font-size: 10pt; text-indent: 0.48in">CERTAIN SHARES (SEE INSTRUCTIONS)</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; text-indent: 4.5in">[&nbsp; &nbsp;]</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0; border-top: Black 0.5pt dashed">13.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW&nbsp;(11): 60.4%</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<DIV STYLE="padding: 1pt 0in; border-top: Black 0.5pt dashed; border-bottom: Black 0.5pt dashed">

<P STYLE="font-size: 10pt; margin: 0pt 0">14.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;TYPE OF REPORTING PERSON (SEE INSTRUCTIONS): CO</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

</DIV>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

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<P STYLE="margin: 0pt 0; font-size: 10pt"></P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">This Amendment No. 5 amends and supplements the Schedule 13D originally
filed on February 14<SUP>th</SUP>, 2011 (this &quot;Amendment No. 5&quot;), as further amended by Amendments No. 1, No. 2, No. 3 and No.
4, on behalf of RP STAK, SAN FAUSTIN and TECHINT HOLDINGS (as defined thereunder), relating to the Ordinary Shares, par value $1 per share
of Tenaris S.A. (the &ldquo;Ordinary Shares&rdquo;).</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">No changes occurred except on the following Items:</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-indent: 0in; margin: 0pt 0"><B>Item 2. Identity and Background</B></P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0 0pt 45pt">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">This Schedule 13D is being jointly filed by each of the following persons
pursuant to Rule 13d-1(k) (collectively, the &ldquo;Reporting Persons&rdquo;).</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 27pt">(a)</TD><TD STYLE="text-align: justify">ROCCA &amp; PARTNERS STICHTING ADMINISTRATIEKANTOOR AANDELEN SAN FAUSTIN (&ldquo;RP STAK&rdquo;)</TD></TR></TABLE>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0 0pt 45pt">Fascinatio Boulevard 764, 2909 VA Capelle aan den IJssel, The
Netherlands.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0 0pt 45pt">RP STAK is a private foundation (<I>stichting</I>) organized under
the laws of The Netherlands. No person or group of persons controls RP STAK.</P>

<P STYLE="font-size: 10pt; margin: 0pt 0 0pt 45pt"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 27pt">(b)</TD><TD STYLE="text-align: justify">SAN FAUSTIN S.A. (&ldquo;SAN FAUSTIN&rdquo;)</TD></TR></TABLE>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0 0pt 45pt">26, Boulevard Royal, Ground Floor, L-2449 Luxembourg.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0 0pt 45pt">SAN FAUSTIN is a <I>soci&eacute;t&eacute; anonyme</I> (public
limited liability company) organized under the laws of the Grand-Duchy of Luxembourg. RP STAK continues to control SAN FAUSTIN (i.e. it
continues to have the ability to influence matters affecting, or submitted to a vote of the shareholders of SAN FAUSTIN, including the
election of directors and the approval of certain corporate transactions and other matters concerning SAN FAUSTIN&rsquo;s policies).</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0 0pt 45pt">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 27pt">(c)</TD><TD STYLE="text-align: justify">TECHINT HOLDINGS S.&Agrave; R.L. (&ldquo;TECHINT HOLDINGS&rdquo;)</TD></TR></TABLE>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0 0pt 45pt">26, Boulevard Royal, Ground Floor, L-2449 Luxembourg.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0 0pt 45pt">TECHINT HOLDINGS is a <I>soci&eacute;t&eacute; &agrave; responsabilit&eacute;
limit&eacute;e</I> (private limited liability company) organized under the laws of the Grand-Duchy of Luxembourg. All of the shares of
TECHINT HOLDINGS are held by SAN FAUSTIN.</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">The name, residence or business address, present principal occupation or
employment (and the name, principal business and address of any corporation or other organization in which such employment is conducted)
and citizenship of each voting committee member, executive officer or director, as applicable, of each Reporting Person are set forth
in Schedule I and is incorporated into this Item 2 by reference.</P>

<P STYLE="font-size: 10pt; text-align: justify; text-indent: 0in; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">During the last five years, none of the Reporting Persons, nor, to the
knowledge of the Reporting Persons, none of the persons listed on Schedule I has (i) been convicted in a criminal proceeding (excluding
traffic violations or similar misdemeanors) or (ii) been a party to a civil proceeding of a judicial or administrative body of competent
jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of,
or prohibiting or mandating activities subject to federal or state securities laws or finding any violation with respect to such laws.</P>

<P STYLE="font-size: 10pt; text-align: justify; text-indent: 0in; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">Information with respect to each of the Reporting Persons is given solely
by such Reporting Person, and no Reporting Person assumes responsibility for the accuracy or completeness of information given by another
Reporting Person.</P>

<P STYLE="font-size: 10pt; text-indent: 0in; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; text-indent: -0.25in; margin: 0pt 0 0pt 0.25in"><B>Item 3. Source and Amount of Funds
or Other Consideration</B></P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">The events requiring the filing of this Amendment No. 5 did not involve
any transfer of funds or any kind of consideration. This filing is due to some minor changes in the composition of the Board of Directors
or executive officers, their residence or business address and/or their present principal occupation or employment of some of the Reporting
Persons.</P>

<P STYLE="font-size: 10pt; text-align: justify; text-indent: 0in; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">There were no changes in the holdings of Ordinary Shares of RP STAK, SAN
FAUSTIN and TECHINT HOLDINGS since such Reporting Persons filed their most recent Amendment No. 4 to Schedule 13D on June 28<SUP>th</SUP>,
2021.</P>

<P STYLE="font-size: 10pt; text-align: justify; text-indent: 0in; margin: 0pt 0">&nbsp;</P>

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<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: justify"></P>

<P STYLE="font-size: 10pt; text-indent: -0.25in; margin: 0pt 0 0pt 0.25in"><B>Item 4. Purpose of Transaction</B></P>

<P STYLE="font-size: 10pt; text-align: justify; text-indent: 0in; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">This filing of the Amendment No. 5 is due to some minor changes in the
composition of the Board of Directors or executive officers, their residence or business address and/or their present principal occupation
or employment, of some of the Reporting Persons.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">There were no changes in the holdings of Ordinary Shares of RP STAK, SAN
FAUSTIN and TECHINT HOLDINGS since such Reporting Persons filed their most recent Amendment No. 4 to Schedule 13D on June 28<SUP>th</SUP>,
2021. RP STAK continues to control SAN FAUSTIN (i.e. it continues to have the ability to influence matters affecting, or submitted to
a vote of the shareholders of SAN FAUSTIN, including the election of directors and the approval of certain corporate transactions and
other matters concerning SAN FAUSTIN&rsquo;s policies). Shares&nbsp;representing approximately 65% of SAN FAUSTIN&rsquo;S votes and 42%
of SAN FAUSTIN&rsquo;S capital are deposited with RP STAK.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-indent: 0in; margin: 0pt 0"><B>Item 5. Interest in Securities of the Issuer</B></P>

<P STYLE="font-size: 10pt; text-align: justify; text-indent: -42pt; margin: 0pt 0 0pt 42pt">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD>&nbsp;</TD><TD>(a) (b)</TD><TD STYLE="text-align: justify"><P STYLE="margin: 0pt; font-size: 10pt; text-align: justify; text-indent: 0pt">RP
STAK. See items (7) through (11) and (13) on page 2</P>
                                                               <P STYLE="margin: 0pt; font-size: 10pt; text-align: justify; text-indent: 0pt">SAN
FAUSTIN. See items (7) through (11) and (13) on page 3</P>
                                                               <P STYLE="margin: 0pt; font-size: 10pt; text-align: justify; text-indent: 0pt">TECHINT HOLDINGS. See items (7) through (11) and (13) on page 4</P>

</TD></TR>
                                                                                                                 <TR STYLE="vertical-align: top">
<TD>&nbsp;</TD><TD>&nbsp;</TD><TD STYLE="text-align: justify">&nbsp;</TD></TR>
                                                                                                                 <TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 27pt">(c)</TD><TD STYLE="text-align: justify">There have been no transactions in Ordinary Shares effected by the Reporting Persons or, to the best of
the Reporting Person's knowledge, any person or entity identified on Schedule I hereto, during the last 60 days.</TD></TR></TABLE>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 27pt">(d)</TD><TD>Not applicable.</TD></TR></TABLE>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 27pt">(e)</TD><TD STYLE="text-align: justify">Not applicable.</TD></TR></TABLE>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt"> <B>Item 7.</B> <B>Material to Be Filed as Exhibits</B></P>



<P STYLE="font-size: 10pt; text-indent: 0in; margin: 0pt 0"></P>

<P STYLE="font-size: 10pt; text-align: justify; text-indent: -0.25in; margin: 0pt 0 0pt 0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD>&nbsp;</TD><TD STYLE="text-align: center">Exhibit</TD><TD STYLE="text-align: justify">Description</TD></TR>
                                                                                                                 <TR STYLE="vertical-align: top">
<TD>&nbsp;</TD><TD STYLE="text-align: center">&nbsp;</TD><TD STYLE="text-align: justify">&nbsp;</TD></TR>
                                                                                                                 <TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="text-align: center; width: 0.75in">A</TD><TD STYLE="text-align: justify">Power of Attorney of ROCCA &amp; PARTNERS STICHTING ADMINISTRATIEKANTOOR AANDELEN SAN FAUSTIN dated October
31<SUP>st</SUP>, 2023.</TD></TR><TR STYLE="vertical-align: top">
<TD>&nbsp;</TD><TD STYLE="text-align: center">&nbsp;</TD><TD STYLE="text-align: justify">&nbsp;</TD></TR>
                                <TR STYLE="vertical-align: top">
<TD>&nbsp;</TD><TD STYLE="text-align: center">B</TD><TD STYLE="text-align: justify">Power
of Attorney of SAN FAUSTIN S.A., dated September 28<SUP>th</SUP>, 2023.</TD></TR>

<TR STYLE="vertical-align: top">
<TD>&nbsp;</TD><TD STYLE="text-align: center">&nbsp;</TD><TD STYLE="text-align: justify">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="text-align: center; width: 0.75in">C</TD><TD STYLE="text-align: justify">Power of Attorney of TECHINT HOLDINGS S.&agrave; r.l., dated September 28<SUP>th</SUP>, 2023.</TD></TR></TABLE>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0 0pt 42pt"></P>

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<P STYLE="margin: 0pt 0 0pt 42pt; font-size: 10pt; text-align: right">&nbsp;</P>

<P STYLE="margin: 0pt 0 0pt 42pt; font-size: 10pt; text-align: right">Schedule I</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>ROCCA &amp; PARTNERS STICHTING ADMINISTRATIEKANTOOR AANDELEN SAN FAUSTIN</B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B><U>MANAGEMENT</U></B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0 0pt 42pt"><B>&nbsp;</B></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font-size: 10pt; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 26%; border: Black 1pt solid; padding-left: 9pt; font-size: 10pt"><B>Manager</B></TD>
    <TD STYLE="width: 34%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.45pt; font-size: 10pt"><B>Residence or business address</B></TD>
    <TD STYLE="width: 25%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 4.15pt; font-size: 10pt"><B>Present Principal occupation</B></TD>
    <TD STYLE="width: 15%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt; font-size: 10pt"><B>Citizenship</B></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; padding-left: 9pt; font-size: 10pt">Earl Management (Netherlands) B.V.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.55pt; font-size: 10pt">Fascinatio Boulevard 764, 2909 VA Capelle aan den IJssel, The Netherlands</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 4.15pt; font-size: 10pt">Management Company</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt; font-size: 10pt">Dutch</TD></TR>
  </TABLE>
<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B><U>VOTING COMMITTEE</U></B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>&nbsp;</B></P>

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  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 26%; border: Black 1pt solid; font-size: 10pt"><B>Members</B></TD>
    <TD STYLE="width: 34%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.45pt; font-size: 10pt"><B>Residence or business address</B></TD>
    <TD STYLE="width: 26%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.6pt; font-size: 10pt"><B>Present principal occupation</B></TD>
    <TD STYLE="width: 14%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 5.35pt; font-size: 10pt"><B>Citizenship</B></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; font-size: 10pt">Paolo Rocca (Chairman)</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt">Av. Leandro N. Alem 1067, 29<SUP>th</SUP> floor, Buenos Aires, Argentina</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.6pt; font-size: 10pt">Chairman &amp; CEO of Tenaris S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; font-size: 10pt">Gianfelice Rocca </TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt">Via Monte Rosa 93, 20149 Milan, Italy</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.6pt; font-size: 10pt">Chairman of the Board of San Faustin S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; font-size: 10pt">Roberto Bonatti</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt">Viale Piave 4, 20129 Milan, Italy </TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.6pt; font-size: 10pt">Director of San Faustin S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; font-size: 10pt">Enrico Bonatti</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt">8th Floor, Farringdon Street, London, EC4A 4AB, United Kingdom</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.6pt; font-size: 10pt">Director of Tenaris Global Services (UK) Ltd.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt">Swiss</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; font-size: 10pt">Giovanni Sardagna</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt">Gravules-ch 10, 7522 La Punt Chamues-ch, Switzerland </TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.6pt; font-size: 10pt">Director of Investors&rsquo; relations of Tenaris S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; font-size: 10pt">Andres Pi&ntilde;eyro</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt">Calle Recoletos 23, 3rd floor, 28001 Madrid, Spain</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.6pt; font-size: 10pt">President of Meridium S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt">Argentine</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; font-size: 10pt">Lodovico Rocca</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt">Via Monte Rosa 93, 20149 Milan, Italy</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.6pt; font-size: 10pt">Vice-president of Techint E&amp;C, Uruguay</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt">Italian</TD></TR>
  </TABLE>
<P STYLE="font-size: 10pt; margin: 0pt 0 0pt 42pt">&nbsp;</P>

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<P STYLE="margin: 0pt 0 0pt 42pt; font-size: 10pt"></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>SAN FAUSTIN S.A.</B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B><U>BOARD OF DIRECTORS</U></B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0 0pt 42pt"><B>&nbsp;</B></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse; font-size: 10pt">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 27%; border: Black 1pt solid"><B>Name</B></TD>
    <TD STYLE="width: 33%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid"><B>Residence or business address</B></TD>
    <TD STYLE="width: 25%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 5.6pt"><B>Present principal occupation</B></TD>
    <TD STYLE="width: 15%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt"><B>Citizenship</B></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">Gianfelice Rocca</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Via Monte Rosa 93, 20149 Milan, Italy</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Chairman of the Board of San Faustin S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">Paolo Rocca</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Av. Leandro N. Alem 1067, 29<SUP>th</SUP> floor, Buenos Aires, Argentina</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Chairman &amp; CEO of Tenaris S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">Roberto Bonatti</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Viale Piave 4, 20129 Milan, Italy</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Director of San Faustin S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">Guido Bonatti</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Via Donizetti 57, Milan, Italy</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Financial Advisor</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">Nicola Drago</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">2, Ugo Bassi, 20159 Milan, Italy</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Vice-president of De Agostini SpA</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">Giorgio Alliata di Montereale</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">
    <P STYLE="font-size: 10pt; margin: 0pt 0">Carlos M. Della Paolera 299, 18<SUP>th</SUP> floor, Buenos Aires,</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">Argentina</P></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Economist</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">Bob Kneip</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">33, rue des Puits de Romain, L-8070, Bertrange, Luxembourg</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Vice-Chairman of Kneip Communication Luxembourg</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt">Luxembourger</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">Andres Pi&ntilde;eyro</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Calle Recoletos 23, 3rd floor, 28001 Madrid, Spain</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">President, Meridium S.A., Buenos Aires</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt">Argentine</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">Lodovico Rocca</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Via Monte Rosa 93, 20149 Milan, Italy</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Vice-president of Techint E&amp;C, Uruguay</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">Giovanni Sardagna</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Gravules-ch 10, 7522 La Punt Chamues-ch, Switzerland </TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Director of Investors&rsquo; relations of Tenaris S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">Paolo Bassetti</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Strada Principal&abreve; 216. Copsa Mare, Sibiu 557046, Romania&nbsp;</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Director of BEPA Investitii Consultor SRL, Bucarest, Romania</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt">Italian</TD></TR>
  </TABLE>
<P STYLE="font-size: 10pt; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B><U>OFFICERS</U></B></P>

<P STYLE="font-size: 10pt; margin: 0pt 0"><B>&nbsp;</B></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse; font-size: 10pt">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 27%; border: Black 1pt solid"><B>Name</B></TD>
    <TD STYLE="width: 32%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid"><B>Residence or business address</B></TD>
    <TD STYLE="width: 26%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid"><B>Present principal occupation</B></TD>
    <TD STYLE="width: 15%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt"><B>Citizenship</B></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">
    <P STYLE="font-size: 10pt; margin: 0pt 0"><B>Chairman of the Board</B></P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">Gianfelice Rocca</P></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Via Monte Rosa 93, 20149 Milan, Italy</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Chairman of the Board of San Faustin S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">
    <P STYLE="font-size: 10pt; margin: 0pt 0"><B>President</B></P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">Paolo Rocca</P></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Av. Leandro N. Alem 1067, 29<SUP>th</SUP> floor, Buenos Aires, Argentina</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Chairman &amp; CEO of Tenaris S.A. </TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">
    <P STYLE="font-size: 10pt; margin: 0pt 0"><B>Vice-president</B></P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">Giovanni Sardagna</P></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Gravules-ch 10, 7522 La Punt chamues-ch, Switzerland </TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Director of Investors&rsquo; relations of Tenaris S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 0.35pt">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">
    <P STYLE="font-size: 10pt; margin: 0pt 0"><B>Secretary of the Board of Directors and Chief Legal Officer</B></P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">Fernando Jorge Mantilla</P></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">
    <P STYLE="font-size: 10pt; margin: 0pt 0">Carlos M. Della Paolera 299, 16<SUP>th</SUP> floor, Buenos Aires,</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">Argentina</P></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Chief Legal Officer of San Faustin S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Argentine</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">
    <P STYLE="font-size: 10pt; margin: 0pt 0"><B>Assistant Secretary of the Board of Directors</B></P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">Mariana Pe&ntilde;a-Pinon</P></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">26, Boulevard Royal, Ground Floor, L-2449 Luxembourg </TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Legal Manager of San Faustin S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">French</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">
    <P STYLE="font-size: 10pt; margin: 0pt 0"><B>Chief Financial Officer</B></P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">Mario O. Lalla</P></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Av. Leandro N. Alem 1067, 28<SUP>th</SUP> floor, Buenos Aires, Argentina</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Chief Financial Officer of San Faustin S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Argentine</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">
    <P STYLE="font-size: 10pt; margin: 0pt 0"><B>General Manager </B></P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">Diego Fortunato</P></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">26, Boulevard Royal, Ground Floor, L-2449 Luxembourg</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">General Manager of San Faustin S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Italian</TD></TR>
  </TABLE>
<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>&nbsp;</B></P>

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<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: center"><B></B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>TECHINT HOLDINGS S.&agrave; r.l.</B></P>

<P STYLE="font-size: 10pt; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B><U>BOARD OF MANAGERS</U></B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0 0pt 42pt"><B>&nbsp;</B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0 0pt 42pt"><B>&nbsp;</B></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse; font-size: 10pt">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 25%; border: Black 1pt solid"><B>Name</B></TD>
    <TD STYLE="width: 33%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid"><B>Residence or business address</B></TD>
    <TD STYLE="width: 28%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid"><B>Present principal occupation</B></TD>
    <TD STYLE="width: 14%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid"><B>Citizenship</B></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">
    <P STYLE="font-size: 10pt; margin: 0pt 0">Gianfelice M. Rocca</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">(Chairman)</P></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Via Monte Rosa 93, 20149 Milan, Italy</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Chairman of the Board of San Faustin S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">
    <P STYLE="font-size: 10pt; margin: 0pt 0">Paolo Rocca</P>
    <P STYLE="font-size: 10pt; margin: 0pt 0">(Vice-chairman)</P></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Av. Leandro N. Alem 1067, 29<SUP>th</SUP> floor, Buenos Aires, Argentina</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Chairman &amp; CEO of Tenaris S.A. </TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Italian</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">Mario O. Lalla</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Av. Leandro N. Alem 1067, 28<SUP>th</SUP> floor, Buenos Aires, Argentina</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Chief Financial Officer of San Faustin S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Argentine</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">Alain Renard</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">74, Grand-Rue, L-1660 Luxembourg, Grand Duchy of Luxembourg</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Member of the Executive Committee of Atalux</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">French</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid">Diego Fortunato</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">26, Boulevard Royal, Ground Floor, L-2449 Luxembourg </TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">General Manager of San Faustin S.A.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid">Italian</TD></TR>
  </TABLE>
<P STYLE="font-size: 10pt; margin: 0pt 0 0pt 42pt">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0 0pt 42pt">&nbsp;</P>

<P STYLE="margin: 0pt 0 0pt 42pt; font-size: 10pt">&nbsp;</P>

<P STYLE="margin: 0pt 0 0pt 42pt; font-size: 10pt">&nbsp;</P>

<P STYLE="margin: 0pt 0 0pt 42pt; font-size: 10pt">&nbsp;</P>

<P STYLE="margin: 0pt 0 0pt 42pt; font-size: 10pt">&nbsp;</P>

<P STYLE="margin: 0pt 0 0pt 42pt; font-size: 10pt"></P>

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<P STYLE="margin: 0pt 0 0pt 42pt; font-size: 10pt">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><U>SIGNATURE</U></P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0; text-indent: 0.5in">After reasonable inquiry and to the best of my knowledge
and belief, I, Fernando J. Mantilla, attorney duly authorized by ROCCA &amp; PARTNERS STICHTING ADMINISTRATIEKANTOOR AANDELEN SAN FAUSTIN
to sign this statement, certify that the information set forth in this statement is true, complete and correct.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0; text-indent: 0.5in">Pursuant to Rule 13d-1(k)(1), the undersigned joins
in the filing of this Amendment No. 5 on his own behalf and on behalf of SAN FAUSTIN S.A. and TECHINT HOLDINGS S.&Agrave; R.L.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">November 2<SUP>nd</SUP>, 2023</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0; text-indent: 3in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse; font-size: 10pt">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 35%">&nbsp;</TD>
    <TD STYLE="text-align: center; width: 16%">&nbsp;</TD>
    <TD STYLE="text-align: center; width: 49%">/s/ Fernando J. Mantilla<BR>
Attorney-in-fact</TD></TR>
</TABLE>



<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><U>SIGNATURE</U></P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0; text-indent: 0.5in">After reasonable inquiry and to the best of my knowledge
and belief, I, Fernando J. Mantilla, attorney duly authorized by SAN FAUSTIN S.A. to sign this statement, certify that the information
set forth in this statement is true, complete and correct.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0; text-indent: 0.5in">Pursuant to Rule 13d - 1(k)(1), the undersigned joins
in the filing of this Amendment No. 5 on his own behalf and on behalf of ROCCA &amp; PARTNERS STICHTING ADMINISTRATIEKANTOOR AANDELEN
SAN FAUSTIN and TECHINT HOLDINGS S.&Agrave; R.L.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">November 2<SUP>nd</SUP>, 2023</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0; text-indent: 3in">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: justify; text-indent: 3in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse; font-size: 10pt">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 35%">&nbsp;</TD>
    <TD STYLE="text-align: center; width: 16%">&nbsp;</TD>
    <TD STYLE="text-align: center; width: 49%">/s/ Fernando J. Mantilla<BR>
Attorney-in-fact</TD></TR>
</TABLE>


<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0; text-indent: 3in">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: center">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: center">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: center"></P>

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<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: center">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><U>SIGNATURE</U></P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0; text-indent: 0.5in">After reasonable inquiry and to the best of my knowledge
and belief, I, Fernando J. Mantilla, attorney duly authorized by TECHINT HOLDINGS S.&Agrave; R.L. to sign this statement, certify that
the information set forth in this statement is true, complete and correct.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0; text-indent: 0.5in">Pursuant to Rule 13d-1(k)(1), the undersigned joins
in the filing of this Amendment No. 5 on his own behalf and on behalf of ROCCA &amp; PARTNERS STICHTING ADMINISTRATIEKANTOOR AANDELEN
SAN FAUSTIN and SAN FAUSTIN S.A.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">November 2<SUP>nd</SUP>, 2023</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0; text-indent: 3in">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: justify; text-indent: 3in">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: justify; text-indent: 3in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse; font-size: 10pt">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 35%">&nbsp;</TD>
    <TD STYLE="width: 16%; text-align: center">&nbsp;</TD>
    <TD STYLE="text-align: center; width: 49%">/s/ Fernando J. Mantilla<BR>
Attorney-in-fact</TD></TR>
  </TABLE>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: justify; text-indent: 3in"></P>


<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: justify; text-indent: 3in"></P>


<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0; text-indent: 3in">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 5pt 0pt 0">&nbsp;</P>

<P STYLE="margin: 0pt 5pt 0pt 0; font-size: 10pt; text-align: right">&nbsp;</P>

<P STYLE="margin: 0pt 5pt 0pt 0; font-size: 10pt; text-align: right">&nbsp;</P>

<P STYLE="margin: 0pt 5pt 0pt 0; font-size: 10pt; text-align: right">&nbsp;</P>

<P STYLE="margin: 0pt 5pt 0pt 0; font-size: 10pt; text-align: right"></P>

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<P STYLE="margin: 0pt 5pt 0pt 0; font-size: 10pt; text-align: right">&nbsp;</P>

<P STYLE="margin: 0pt 5pt 0pt 0; font-size: 10pt; text-align: right">Exhibit A</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 5pt 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>POWER OF ATTORNEY</B></P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">The undersigned, Jean-Paul Defesche, Director of Earl Management (Netherlands)
B.V., a private limited company organized under the laws of the Netherlands, sole Manager of ROCCA &amp; PARTNERS STICHTING ADMINISTRATIEKANTOOR
AANDELEN SAN FAUSTIN, a private foundation (Stichting) organized under the laws of the Netherlands, hereby constitutes and appoints <B>Fernando
J. Mantilla, Mario O. Lalla and Diego Fortunato</B>, each of them acting severally, as attorneys or attorney of the undersigned, to sign
on its behalf a Statement on Schedule 13G or 13D relating to the Common Stock of TENARIS S.A., including any agreements attached as exhibits
thereto, and to sign any or all amendments to such Statement, and to file the same, with all exhibits thereto, and other documents in
connection therewith, with the Securities and Exchange Commission of the United States of America, granting unto said attorneys or attorney,
and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about
the premises, hereby ratifying and confirming all that said attorneys or attorney may lawfully do or cause to be done by virtue hereof.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">By:</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">/s/ Jean-Paul Defesche</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">(on behalf of Earl Management (Netherlands) B.V.)</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">Dated: October 31<SUP>st</SUP>, 2023</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: right">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: right">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: right">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: right"></P>

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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: right">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: right">Exhibit B</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">[<I>LETTERHEAD OF SAN FAUSTIN S.A.</I>]</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>POWER OF ATTORNEY</B></P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">The undersigned, Alain Renard and Mariana Pe&ntilde;a-Pinon, Attorneys-in-fact
of SAN FAUSTIN S.A., a company organized under the laws of the Grand Duchy of Luxembourg, hereby constitutes and appoints <B>Fernando
J. Mantilla, Mario O. Lalla and Diego Fortunato</B>, each of them acting severally, as attorneys or attorney of the undersigned, to sign
on its behalf a Statement on Schedule 13G or 13D relating to the Common Stock of TENARIS S.A., including any agreements attached as exhibits
thereto, and to sign any or all amendments to such Statement, and to file the same, with all exhibits thereto, and other documents in
connection therewith, with the Securities and Exchange Commission of the United States of America, granting unto said attorneys or attorney,
and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about
the premises, hereby ratifying and confirming all that said attorneys or attorney may lawfully do or cause to be done by virtue hereof.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">By:</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse; font-size: 10pt">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 38%">
    <P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">/s/ Alain Renard</P>
    <P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">Attorney-in-fact</P></TD>
    <TD STYLE="width: 20%; text-align: center">&nbsp;</TD>
    <TD STYLE="width: 42%">
    <P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">/s/ Mariana Pe&ntilde;a-Pinon</P>
    <P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">Attorney-in-fact</P></TD></TR>
  </TABLE>
<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">Dated: September 28<SUP>th</SUP> , 2023.</P>

<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: right">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: right">&nbsp;</P>

<P STYLE="margin: 0pt 0; font-size: 10pt; text-align: right">&nbsp;</P>

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<P STYLE="font-size: 10pt; text-align: right; margin: 0pt 0">Exhibit C</P>

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<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">[<I>LETTERHEAD OF TECHINT HOLDINGS S.&Agrave; R.L.</I>]</P>

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<P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0"><B>POWER OF ATTORNEY</B></P>

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<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">The undersigned, Alain Renard and Mariana Pe&ntilde;a-Pinon, Attorneys-in-fact
of TECHINT HOLDINGS S.&Agrave; R.L., a company organized under the laws of the Grand Duchy of Luxembourg, hereby constitutes and appoints
<B>Fernando J. Mantilla and Mario O. Lalla and Diego Fortunato</B>, each of them acting severally, as attorneys or attorney of the undersigned,
to sign on its behalf a Statement on Schedule 13G or 13D relating to the Common Stock of TENARIS S.A., including any agreements attached
as exhibits thereto, and to sign any or all amendments to such Statement, and to file the same, with all exhibits thereto, and other documents
in connection therewith, with the Securities and Exchange Commission of the United States of America, granting unto said attorneys or
attorney, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done
in and about the premises, hereby ratifying and confirming all that said attorneys or attorney may lawfully do or cause to be done by
virtue hereof.</P>

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    <TD STYLE="width: 47%">
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    <P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">/s/ Alain Renard</P>
    <P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">Attorney-in-fact</P></TD>
    <TD STYLE="width: 16%; text-align: center">&nbsp;</TD>
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    <P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">/s/ Mariana Pe&ntilde;a-Pinon</P>
    <P STYLE="font-size: 10pt; text-align: center; margin: 0pt 0">Attorney-in-fact</P></TD></TR>
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<P STYLE="font-size: 10pt; text-align: justify; margin: 0pt 0">Dated: September 28<SUP>th</SUP>, 2023</P>

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