<SEC-DOCUMENT>0001085146-25-005947.txt : 20251014
<SEC-HEADER>0001085146-25-005947.hdr.sgml : 20251014
<ACCEPTANCE-DATETIME>20251014151432
ACCESSION NUMBER:		0001085146-25-005947
CONFORMED SUBMISSION TYPE:	SCHEDULE 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20251014
DATE AS OF CHANGE:		20251014

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MAC Copper Ltd
		CENTRAL INDEX KEY:			0001950246
		STANDARD INDUSTRIAL CLASSIFICATION:	METAL MINING [1000]
		ORGANIZATION NAME:           	01 Energy & Transportation
		EIN:				000000000
		STATE OF INCORPORATION:			Y9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-94097
		FILM NUMBER:		251391465

	BUSINESS ADDRESS:	
		STREET 1:		3RD FLOOR
		STREET 2:		44 ESPLANADE, ST
		CITY:			ST. HELIER
		STATE:			Y9
		ZIP:			JE4 9WG
		BUSINESS PHONE:		8176989901

	MAIL ADDRESS:	
		STREET 1:		3RD FLOOR
		STREET 2:		44 ESPLANADE, ST
		CITY:			ST. HELIER
		STATE:			Y9
		ZIP:			JE4 9WG

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Metals Acquisition Ltd
		DATE OF NAME CHANGE:	20221011

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Fourth Sail Capital LP
		CENTRAL INDEX KEY:			0001803158
		ORGANIZATION NAME:           	
		EIN:				000000000
		STATE OF INCORPORATION:			E9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		OGIER GLOBAL (CAYMAN) LIMITED
		STREET 2:		89 NEXUS WAY
		CITY:			CAMANA BAY GRAND CAYMAN
		STATE:			E9
		ZIP:			KY1-9009
		BUSINESS PHONE:		646-355-2764

	MAIL ADDRESS:	
		STREET 1:		10 MARKET STREET
		STREET 2:		#754
		CITY:			GRAND CAYMAN
		STATE:			E9
		ZIP:			KY1-9006
</SEC-HEADER>
<DOCUMENT>
<TYPE>SCHEDULE 13G/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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    <previousAccessionNumber>0001085146-25-002899</previousAccessionNumber>
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        <filerCredentials>
          <!-- Field: Pseudo-Tag; ID: Name; Data: Fourth Sail Capital LP -->
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          <ccc>XXXXXXXX</ccc>
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      <amendmentNo>1</amendmentNo>
      <securitiesClassTitle>Orginary Shares</securitiesClassTitle>
      <eventDateRequiresFilingThisStatement>09/30/2025</eventDateRequiresFilingThisStatement>
      <issuerInfo>
        <issuerCik>0001950246</issuerCik>
        <issuerName>MAC Copper Ltd</issuerName>
        <issuerCusip>G60409110</issuerCusip>
        <issuerPrincipalExecutiveOfficeAddress>
          <com:street1>3RD FLOOR</com:street1>
          <com:street2>44 ESPLANADE, ST</com:street2>
          <com:city>ST. HELIER</com:city>
          <com:stateOrCountry>Y9</com:stateOrCountry>
          <com:zipCode>JE4 9WG</com:zipCode>
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      </issuerInfo>
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        <designateRulePursuantThisScheduleFiled>Rule 13d-1(c)</designateRulePursuantThisScheduleFiled>
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      <reportingPersonName>Fourth Sail Capital LP</reportingPersonName>
      <citizenshipOrOrganization>E9</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
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        <sharedVotingPower>82462034.00</sharedVotingPower>
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        <sharedDispositivePower>82462034.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>82462034.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
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    <coverPageHeaderReportingPersonDetails>

      <reportingPersonName>Fourth Sail Discovery LLC</reportingPersonName>
      <citizenshipOrOrganization>DE</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
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        <sharedVotingPower>88983.00</sharedVotingPower>
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        <sharedDispositivePower>88983.00</sharedDispositivePower>
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      <typeOfReportingPerson>OO</typeOfReportingPerson>
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    <coverPageHeaderReportingPersonDetails>

      <reportingPersonName>Fourth Sail Long Short LLC</reportingPersonName>
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      <reportingPersonBeneficiallyOwnedNumberOfShares>
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      </reportingPersonBeneficiallyOwnedNumberOfShares>
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    <coverPageHeaderReportingPersonDetails>

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      <citizenshipOrOrganization>DE</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
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        <sharedVotingPower>82462034.00</sharedVotingPower>
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        <sharedDispositivePower>82462034.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>82462034.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
      <classPercent>0.78</classPercent>
      <typeOfReportingPerson>OO</typeOfReportingPerson>
    </coverPageHeaderReportingPersonDetails>
    <coverPageHeaderReportingPersonDetails>

      <reportingPersonName>Tordesilhas Capital Gestora De Recursos Ltda</reportingPersonName>
      <citizenshipOrOrganization>D5</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
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        <sharedVotingPower>82462034.00</sharedVotingPower>
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        <sharedDispositivePower>82462034.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>82462034.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
      <classPercent>0.78</classPercent>
      <typeOfReportingPerson>OO</typeOfReportingPerson>
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    <coverPageHeaderReportingPersonDetails>

      <reportingPersonName>Ariel Merenstein</reportingPersonName>
      <citizenshipOrOrganization>X1</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>0.00</soleVotingPower>
        <sharedVotingPower>82462034.00</sharedVotingPower>
        <soleDispositivePower>0.00</soleDispositivePower>
        <sharedDispositivePower>82462034.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>82462034.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
      <classPercent>0.78</classPercent>
      <typeOfReportingPerson>IN</typeOfReportingPerson>
    </coverPageHeaderReportingPersonDetails>
    <items>
      <item1>
        <issuerName>MAC Copper Ltd</issuerName>
        <issuerPrincipalExecutiveOfficeAddress>3RD FLOOR, 44 ESPLANADE, ST, ST. HELIER, JERSEY JE4 9WG</issuerPrincipalExecutiveOfficeAddress>
      </item1>
      <item2>
        <filingPersonName>Fourth Sail Capital LP

Fourth Sail Discovery LLC

Fourth Sail Long Short LLC

Fourth Sail Capital US LP

Tordesilhas Capital Gestora De Recursos Ltda

Ariel Merenstein</filingPersonName>
        <principalBusinessOfficeOrResidenceAddress>Grand Pavilion Com. Centre
Second floor, Suite13
West Bay Road, Grand Cayman, George Town
GRAND CAYMAN, Cayman Islands
KY1-1202</principalBusinessOfficeOrResidenceAddress>
        <citizenship>Fourth Sail Capital LP - CAYMAN ISLANDS

Fourth Sail Discovery LLC - DELAWARE

Fourth Sail Long Short LLC - DELAWARE

Fourth Sail Capital US LP - DELAWARE

Tordesilhas Capital Gestora De Recursos Ltda - BRAZIL

Ariel Merenstein - UNITED STATES</citizenship>
      </item2>
      <item3>
        <notApplicableFlag>Y</notApplicableFlag>
      </item3>
      <item4>
        <amountBeneficiallyOwned>82,462,034</amountBeneficiallyOwned>
        <classPercent>0.78</classPercent>
        <numberOfSharesPersonHas>
          <solePowerOrDirectToVote>Fourth Sail Capital LP - 0

Fourth Sail Discovery LLC - 0

Fourth Sail Long Short LLC - 0

Fourth Sail Capital US LP - 0

Tordesilhas Capital Gestora De Recursos Ltda - 0

Ariel Merenstein - 0</solePowerOrDirectToVote>
          <sharedPowerOrDirectToVote>Fourth Sail Capital LP - 82,462,034

Fourth Sail Discovery LLC - 88,983

Fourth Sail Long Short LLC - 557,582

Fourth Sail Capital US LP - 82,462,034

Tordesilhas Capital Gestora De Recursos Ltda - 82,462,034

Ariel Merenstein - 82,462,034</sharedPowerOrDirectToVote>
          <solePowerOrDirectToDispose>Fourth Sail Capital LP - 0

Fourth Sail Discovery LLC - 0

Fourth Sail Long Short LLC - 0

Fourth Sail Capital US LP - 0

Tordesilhas Capital Gestora De Recursos Ltda - 0

Ariel Merenstein - 0</solePowerOrDirectToDispose>
          <sharedPowerOrDirectToDispose>Fourth Sail Capital LP - 82,462,034

Fourth Sail Discovery LLC - 88,983

Fourth Sail Long Short LLC - 557,582

Fourth Sail Capital US LP - 82,462,034

Tordesilhas Capital Gestora De Recursos Ltda - 82,462,034

Ariel Merenstein - 82,462,034</sharedPowerOrDirectToDispose>
        </numberOfSharesPersonHas>
      </item4>
      <item5>
        <notApplicableFlag>N</notApplicableFlag>
        <classOwnership5PercentOrLess>Y</classOwnership5PercentOrLess>
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      <item6>
        <notApplicableFlag>Y</notApplicableFlag>
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      <item7>
        <notApplicableFlag>Y</notApplicableFlag>
      </item7>
      <item8>
        <notApplicableFlag>Y</notApplicableFlag>
      </item8>
      <item9>
        <notApplicableFlag>Y</notApplicableFlag>
      </item9>
      <item10>
        <notApplicableFlag>N</notApplicableFlag>
        <certifications>By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.</certifications>
      </item10>
    </items>
    <signatureInformation>
      <reportingPersonName>Fourth Sail Capital LP</reportingPersonName>
      <signatureDetails>
        <signature>Thiago Doria</signature>
        <title>Authorized Person</title>
        <date>09/30/2025</date>
      </signatureDetails>
    </signatureInformation>
    <signatureInformation>
      <reportingPersonName>Fourth Sail Discovery LLC</reportingPersonName>
      <signatureDetails>
        <signature>Thiago Doria</signature>
        <title>Authorized Person</title>
        <date>09/30/2025</date>
      </signatureDetails>
    </signatureInformation>
    <signatureInformation>
      <reportingPersonName>Fourth Sail Long Short LLC</reportingPersonName>
      <signatureDetails>
        <signature>Thiago Doria</signature>
        <title>Authorized Person</title>
        <date>09/30/2025</date>
      </signatureDetails>
    </signatureInformation>
    <signatureInformation>
      <reportingPersonName>Fourth Sail Capital US LP</reportingPersonName>
      <signatureDetails>
        <signature>Thiago Doria</signature>
        <title>Authorized Person</title>
        <date>09/30/2025</date>
      </signatureDetails>
    </signatureInformation>
    <signatureInformation>
      <reportingPersonName>Tordesilhas Capital Gestora De Recursos Ltda</reportingPersonName>
      <signatureDetails>
        <signature>Tahiana Azevedo</signature>
        <title>Authorized Person</title>
        <date>09/30/2025</date>
      </signatureDetails>
    </signatureInformation>
    <signatureInformation>
      <reportingPersonName>Ariel Merenstein</reportingPersonName>
      <signatureDetails>
        <signature>Thiago Doria</signature>
        <title>Attorney in fact</title>
        <date>09/30/2025</date>
      </signatureDetails>
    </signatureInformation>
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</DOCUMENT>
</SEC-DOCUMENT>
