<SEC-DOCUMENT>0000902664-25-005057.txt : 20251114
<SEC-HEADER>0000902664-25-005057.hdr.sgml : 20251114
<ACCEPTANCE-DATETIME>20251114162427
ACCESSION NUMBER:		0000902664-25-005057
CONFORMED SUBMISSION TYPE:	SCHEDULE 13G
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20251114
DATE AS OF CHANGE:		20251114

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			89bio, Inc.
		CENTRAL INDEX KEY:			0001785173
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				831114349
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-91200
		FILM NUMBER:		251486836

	BUSINESS ADDRESS:	
		STREET 1:		655 MONTGOMERY STREET
		STREET 2:		SUITE 1500
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94111
		BUSINESS PHONE:		(415) 432-9270

	MAIL ADDRESS:	
		STREET 1:		655 MONTGOMERY STREET
		STREET 2:		SUITE 1500
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94111

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Pentwater Capital Management LP
		CENTRAL INDEX KEY:			0001425851
		ORGANIZATION NAME:           	
		EIN:				000000000
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G

	BUSINESS ADDRESS:	
		STREET 1:		1001 10TH AVENUE SOUTH
		STREET 2:		SUITE 216
		CITY:			NAPLES
		STATE:			FL
		ZIP:			34102
		BUSINESS PHONE:		239-384-9750

	MAIL ADDRESS:	
		STREET 1:		1001 10TH AVENUE SOUTH
		STREET 2:		SUITE 216
		CITY:			NAPLES
		STATE:			FL
		ZIP:			34102
</SEC-HEADER>
<DOCUMENT>
<TYPE>SCHEDULE 13G
<SEQUENCE>1
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    <submissionType>SCHEDULE 13G</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <!-- Field: Pseudo-Tag; ID: Name; Data: Pentwater Capital Management LP -->
          <cik>0001425851</cik>
          <ccc>XXXXXXXX</ccc>
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      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



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  </headerData>
  <formData>
    <coverPageHeader>
      <securitiesClassTitle>Common Stock, par value $0.001 per share</securitiesClassTitle>
      <eventDateRequiresFilingThisStatement>09/30/2025</eventDateRequiresFilingThisStatement>
      <issuerInfo>
        <issuerCik>0001785173</issuerCik>
        <issuerName>89bio, Inc.</issuerName>
        <issuerCusip>282559103</issuerCusip>
        <issuerPrincipalExecutiveOfficeAddress>
          <com:street1>655 MONTGOMERY STREET</com:street1>
          <com:street2>SUITE 1500</com:street2>
          <com:city>SAN FRANCISCO</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>94111</com:zipCode>
        </issuerPrincipalExecutiveOfficeAddress>
      </issuerInfo>
      <designateRulesPursuantThisScheduleFiled>
        <designateRulePursuantThisScheduleFiled>Rule 13d-1(b)</designateRulePursuantThisScheduleFiled>
      </designateRulesPursuantThisScheduleFiled>
    </coverPageHeader>
    <coverPageHeaderReportingPersonDetails>


      <reportingPersonName>Pentwater Capital Management LP</reportingPersonName>
      <citizenshipOrOrganization>DE</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>0.00</soleVotingPower>
        <sharedVotingPower>0.00</sharedVotingPower>
        <soleDispositivePower>0.00</soleDispositivePower>
        <sharedDispositivePower>0.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>0.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
      <classPercent>0</classPercent>
      <typeOfReportingPerson>IA</typeOfReportingPerson>
      <typeOfReportingPerson>PN</typeOfReportingPerson>
      <comments>The information set forth on this cover page reflects information as of the date hereof. As of September 30, 2025, the Reporting Persons may have been deemed to beneficially own 11,750,000 shares of Common Stock (as defined in Item 2(a)), representing 7.9% of the outstanding shares of Common Stock as of such time.</comments>
    </coverPageHeaderReportingPersonDetails>
    <coverPageHeaderReportingPersonDetails>

      <reportingPersonName>Matthew Halbower</reportingPersonName>
      <citizenshipOrOrganization>X1</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>0.00</soleVotingPower>
        <sharedVotingPower>0.00</sharedVotingPower>
        <soleDispositivePower>0.00</soleDispositivePower>
        <sharedDispositivePower>0.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>0.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
      <classPercent>0</classPercent>
      <typeOfReportingPerson>HC</typeOfReportingPerson>
      <typeOfReportingPerson>IN</typeOfReportingPerson>
      <comments>The information set forth on this cover page reflects information as of the date hereof. As of September 30, 2025, the Reporting Persons may have been deemed to beneficially own 11,750,000 shares of Common Stock, representing 7.9% of the outstanding shares of Common Stock as of such time.</comments>
    </coverPageHeaderReportingPersonDetails>
    <items>
      <item1>
        <issuerName>89bio, Inc.</issuerName>
        <issuerPrincipalExecutiveOfficeAddress>655 Montgomery Street, Suite 1500, San Francisco, California 94111</issuerPrincipalExecutiveOfficeAddress>
      </item1>
      <item2>
        <filingPersonName>(i) Pentwater Capital Management LP (the "Investment Manager"), a Delaware limited partnership, and the investment adviser to certain funds (the "Pentwater Funds"), with respect to the shares of common stock, par value $0.001 per share ("Common Stock"), of 89bio, Inc., a Delaware corporation (the "Company"), directly held by the Pentwater Funds; and

(i) Mr. Matthew Halbower ("Mr. Halbower"), the sole shareholder of MCH PWCM Holdings Inc., the general partner of the Investment Manager, with respect to the shares of Common Stock directly held by the Pentwater Funds.

The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons."

The filing of this statement should not be construed as an admission that any of the foregoing persons or any Reporting Person is, for the purposes of Section 13 of the Securities and Exchange Act of 1934, the beneficial owner of the securities reported herein.</filingPersonName>
        <principalBusinessOfficeOrResidenceAddress>The address of the business office of each of the Reporting Persons is 1001 10th Avenue South, Suite 216, Naples, FL 34102.</principalBusinessOfficeOrResidenceAddress>
        <citizenship>The Investment Manager is a Delaware limited partnership. Mr. Halbower is a citizen of the United States.</citizenship>
      </item2>
      <item3>
        <notApplicableFlag>N</notApplicableFlag>
        <typeOfPersonFiling>IA</typeOfPersonFiling>
        <typeOfPersonFiling>HC</typeOfPersonFiling>
      </item3>
      <item4>
        <amountBeneficiallyOwned>The information required by Item 4(a) is set forth in Row 9 and the comment box of the cover page for each of the Reporting Persons and is incorporated herein by reference.

The percentage set forth in this Schedule 13G as of September 30, 2025 is calculated based upon an aggregate of 148,492,428 shares of Common Stock outstanding as of September 16, 2025, as reported in Exhibit 2.1 to the Company's Current Report on Form 8-K, filed with the Securities and Exchange Commission on September 18, 2025.</amountBeneficiallyOwned>
        <classPercent>0%</classPercent>
        <numberOfSharesPersonHas>
          <solePowerOrDirectToVote>The information required by Item 4(c)(i) is set forth in Row 5 and the comment box of the cover page for each of the Reporting Persons and is incorporated herein by reference.</solePowerOrDirectToVote>
          <sharedPowerOrDirectToVote>The information required by Item 4(c)(ii) is set forth in Row 6 and the comment box of the cover page for each of the Reporting Persons and is incorporated herein by reference.</sharedPowerOrDirectToVote>
          <solePowerOrDirectToDispose>The information required by Item 4(c)(iii) is set forth in Row 7 and the comment box of the cover page for each of the Reporting Persons and is incorporated herein by reference.</solePowerOrDirectToDispose>
          <sharedPowerOrDirectToDispose>The information required by Item 4(c)(iv) is set forth in Row 8 and the comment box of the cover page for each of the Reporting Persons and is incorporated herein by reference.</sharedPowerOrDirectToDispose>
        </numberOfSharesPersonHas>
      </item4>
      <item5>
        <notApplicableFlag>N</notApplicableFlag>
        <classOwnership5PercentOrLess>Y</classOwnership5PercentOrLess>
      </item5>
      <item6>
        <notApplicableFlag>N</notApplicableFlag>
        <ownershipMoreThan5PercentOnBehalfOfAnotherPerson>As of the date hereof, not applicable. As of September 30, 2025, see Item 2(a); the Pentwater Funds have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the shares of Common Stock reported herein.</ownershipMoreThan5PercentOnBehalfOfAnotherPerson>
      </item6>
      <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 acquired and are held in the ordinary course of business and 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>
    <exhibitInfo>Exhibit 99.1: Joint Filing Agreement</exhibitInfo>
    <signatureInformation>
      <reportingPersonName>Pentwater Capital Management LP</reportingPersonName>
      <signatureDetails>
        <signature>/s/ Matthew Halbower</signature>
        <title>By: MCH PWCM Holdings Inc., General Partner, By: Matthew Halbower, Chief Executive Officer</title>
        <date>11/14/2025</date>
      </signatureDetails>
    </signatureInformation>
    <signatureInformation>
      <reportingPersonName>Matthew Halbower</reportingPersonName>
      <signatureDetails>
        <signature>/s/ Matthew Halbower</signature>
        <title>Matthew Halbower, Individually</title>
        <date>11/14/2025</date>
      </signatureDetails>
    </signatureInformation>
  </formData>

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<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>p25-2394exhibit99.htm
<DESCRIPTION>JOINT FILING AGREEMENT
<TEXT>
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<P STYLE="font: bold 11pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">EXHIBIT 99.1</P>

<P STYLE="font: bold 11pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">JOINT ACQUISITION STATEMENT<BR>
PURSUANT TO RULE 13d-1(k)</P>

<P STYLE="font: 11pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.5in">The undersigned acknowledge
and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments
to this statement on Schedule 13G shall be filed on behalf of each of the undersigned without the necessity of filing additional joint
acquisition statements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the
completeness and accuracy of the information concerning him or it contained therein, but shall not be responsible for the completeness
and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information
is inaccurate.</P>

<P STYLE="font: 11pt Times New Roman, Times, Serif; margin: 0">DATED: November 14, 2025</P>

<P STYLE="font: 11pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 11pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
    <P STYLE="font: 11pt Times New Roman, Times, Serif; margin: 0">PENTWATER CAPITAL MANAGEMENT LP</P>
    <P STYLE="font: 11pt Times New Roman, Times, Serif; margin: 0">By: MCH PWCM Holdings Inc., General Partner</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 9%; padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="width: 43%; padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="width: 48%; padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">By:&nbsp;&nbsp;<U>/s/ Matthew Halbower&#9;</U></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">Name:&nbsp;&nbsp;Matthew Halbower</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">Title:&nbsp;&nbsp;&nbsp;&nbsp;Chief Executive Officer</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt"><U>/s/ Matthew Halbower&#9;</U></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="text-transform: uppercase">Matthew Halbower</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 11pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 11pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 11pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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