<SEC-DOCUMENT>0001346824-26-000002.txt : 20260107
<SEC-HEADER>0001346824-26-000002.hdr.sgml : 20260107
<ACCEPTANCE-DATETIME>20260107165314
ACCESSION NUMBER:		0001346824-26-000002
CONFORMED SUBMISSION TYPE:	SCHEDULE 13G
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20260107
DATE AS OF CHANGE:		20260107

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Disc Medicine, Inc.
		CENTRAL INDEX KEY:			0001816736
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				851612845
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-91633
		FILM NUMBER:		26516340

	BUSINESS ADDRESS:	
		STREET 1:		321 ARSENAL STREET, SUITE 101
		CITY:			WATERTOWN
		STATE:			MA
		ZIP:			02472
		BUSINESS PHONE:		(617) 674-9274

	MAIL ADDRESS:	
		STREET 1:		321 ARSENAL STREET, SUITE 101
		CITY:			WATERTOWN
		STATE:			MA
		ZIP:			02472

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Gemini Therapeutics, Inc. /DE
		DATE OF NAME CHANGE:	20210209

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FS Development Corp.
		DATE OF NAME CHANGE:	20200702

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			RA CAPITAL MANAGEMENT, L.P.
		CENTRAL INDEX KEY:			0001346824
		ORGANIZATION NAME:           	
		EIN:				830406777
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G

	BUSINESS ADDRESS:	
		STREET 1:		200 BERKELEY STREET, 18TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		617-778-2500

	MAIL ADDRESS:	
		STREET 1:		200 BERKELEY STREET, 18TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	RA CAPITAL MANAGEMENT, LLC
		DATE OF NAME CHANGE:	20051213
</SEC-HEADER>
<DOCUMENT>
<TYPE>SCHEDULE 13G
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/schedule13g" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>SCHEDULE 13G</submissionType>
	    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001346824</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>





    </filerInfo>
  </headerData>

  <formData>
    <coverPageHeader>
	      <securitiesClassTitle>Common Stock, $0.0001 par value per share</securitiesClassTitle>
      <eventDateRequiresFilingThisStatement>12/30/2025</eventDateRequiresFilingThisStatement>
      <issuerInfo>
        <issuerCik>0001816736</issuerCik>        <issuerName>DISC MEDICINE, INC.</issuerName>        <issuerCusip>254604101</issuerCusip>
        <issuerPrincipalExecutiveOfficeAddress>
          <com:street1>321 ARSENAL STREET, SUITE 101</com:street1>
                    <com:city>WATERTOWN</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02472</com:zipCode>
        </issuerPrincipalExecutiveOfficeAddress>
      </issuerInfo>

	        <designateRulesPursuantThisScheduleFiled>
	   				        <designateRulePursuantThisScheduleFiled>Rule 13d-1(c)</designateRulePursuantThisScheduleFiled>
		      </designateRulesPursuantThisScheduleFiled>

    </coverPageHeader>

	    <coverPageHeaderReportingPersonDetails>




    <reportingPersonName>RA Capital Management, L.P.</reportingPersonName>



		 <citizenshipOrOrganization>DE</citizenshipOrOrganization>

      <reportingPersonBeneficiallyOwnedNumberOfShares>
                <soleVotingPower>0.00</soleVotingPower>
                          <sharedVotingPower>2228924.00</sharedVotingPower>
                          <soleDispositivePower>0.00</soleDispositivePower>
                         <sharedDispositivePower>2228924.00</sharedDispositivePower>
             </reportingPersonBeneficiallyOwnedNumberOfShares>

              <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>2228924.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>


     	    <classPercent>5.9</classPercent>




	  	  	  	  <typeOfReportingPerson>IA</typeOfReportingPerson>

	        <typeOfReportingPerson>PN</typeOfReportingPerson>









    </coverPageHeaderReportingPersonDetails>
	    <coverPageHeaderReportingPersonDetails>




    <reportingPersonName>Peter Kolchinsky </reportingPersonName>



		 <citizenshipOrOrganization>X1</citizenshipOrOrganization>

      <reportingPersonBeneficiallyOwnedNumberOfShares>
                <soleVotingPower>0.00</soleVotingPower>
                          <sharedVotingPower>2228924.00</sharedVotingPower>
                          <soleDispositivePower>0.00</soleDispositivePower>
                         <sharedDispositivePower>2228924.00</sharedDispositivePower>
             </reportingPersonBeneficiallyOwnedNumberOfShares>

              <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>2228924.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>


     	    <classPercent>5.9</classPercent>







	        <typeOfReportingPerson>HC</typeOfReportingPerson>



	        <typeOfReportingPerson>IN</typeOfReportingPerson>




    </coverPageHeaderReportingPersonDetails>
	    <coverPageHeaderReportingPersonDetails>




    <reportingPersonName>Rajeev Shah</reportingPersonName>



		 <citizenshipOrOrganization>X1</citizenshipOrOrganization>

      <reportingPersonBeneficiallyOwnedNumberOfShares>
                <soleVotingPower>0.00</soleVotingPower>
                          <sharedVotingPower>2228924.00</sharedVotingPower>
                          <soleDispositivePower>0.00</soleDispositivePower>
                         <sharedDispositivePower>2228924.00</sharedDispositivePower>
             </reportingPersonBeneficiallyOwnedNumberOfShares>

              <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>2228924.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>


     	    <classPercent>5.9</classPercent>







	        <typeOfReportingPerson>HC</typeOfReportingPerson>



	        <typeOfReportingPerson>IN</typeOfReportingPerson>




    </coverPageHeaderReportingPersonDetails>
	    <coverPageHeaderReportingPersonDetails>




    <reportingPersonName>RA Capital Healthcare Fund, L.P.</reportingPersonName>



		 <citizenshipOrOrganization>DE</citizenshipOrOrganization>

      <reportingPersonBeneficiallyOwnedNumberOfShares>
                <soleVotingPower>0.00</soleVotingPower>
                          <sharedVotingPower>2228924.00</sharedVotingPower>
                          <soleDispositivePower>0.00</soleDispositivePower>
                         <sharedDispositivePower>2228924.00</sharedDispositivePower>
             </reportingPersonBeneficiallyOwnedNumberOfShares>

              <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>2228924.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>


     	    <classPercent>5.9</classPercent>





	        <typeOfReportingPerson>PN</typeOfReportingPerson>









    </coverPageHeaderReportingPersonDetails>

    <items>
      <item1>
        <issuerName>DISC MEDICINE, INC.</issuerName>
        <issuerPrincipalExecutiveOfficeAddress>321 ARSENAL STREET, SUITE 101, WATERTOWN, MA, 02472.</issuerPrincipalExecutiveOfficeAddress>
      </item1>

      <item2>
        <filingPersonName>The names of the persons filing this report (collectively, the "Reporting Persons") are:

RA Capital Management, L.P. ("RA Capital")
Peter Kolchinsky ("Dr. Kolchinsky")
Rajeev Shah ("Mr. Shah")
RA Capital Healthcare Fund, L.P. (the "Fund")

The Reporting Persons expressly disclaim status as a "group" for purposes of this Schedule 13G.</filingPersonName>        <principalBusinessOfficeOrResidenceAddress>The address of the principal business office of each of the Reporting Persons is:

c/o RA Capital Management, L.P., 200 Berkeley Street, 18th Floor, Boston MA 02116</principalBusinessOfficeOrResidenceAddress>        <citizenship>RA Capital and the Fund are Delaware limited partnerships.
Dr. Kolchinsky and Mr. Shah are United States citizens.
</citizenship>      </item2>

        <item3>
		        <notApplicableFlag>Y</notApplicableFlag>

      </item3>



    <item4>
    <amountBeneficiallyOwned>Row 9 of each Reporting Person's cover page to this Schedule 13G sets forth the aggregate number of shares of common stock of the Issuer beneficially owned by such Reporting Person and is incorporated by reference.

The Fund directly holds 2,228,924 shares of the Issuer's common stock.

RA Capital Healthcare Fund GP, LLC is the general partner of the Fund. The general partner of RA Capital is RA Capital Management GP, LLC, of which Dr. Kolchinsky and Mr. Shah are the controlling persons. RA Capital serves as investment adviser for the Fund and may be deemed a beneficial owner, for purposes of Section 13(d) of the Act, of any securities of the Issuer held by the Fund. The Fund has delegated to RA Capital the sole power to vote and the sole power to dispose of all securities held in the Fund's portfolio, including the shares of the Issuer's common stock reported herein. Because the Fund has divested voting and investment power over the reported securities it holds and may not revoke that delegation on less than 61 days' notice, the Fund disclaims beneficial ownership of the securities it holds for purposes of Section 13(d) of the Act. As managers of RA Capital, Dr. Kolchinsky and Mr. Shah may be deemed beneficial owners, for purposes of Section 13(d) of the Act, of any securities of the Issuer beneficially owned by RA Capital. RA Capital, Dr. Kolchinsky, and Mr. Shah disclaim beneficial ownership of the securities reported in this Schedule 13G other than for the purpose of determining their obligations under Section 13(d) of the Act, and the filing of this Schedule 13G shall not be deemed an admission that either RA Capital, Dr. Kolchinsky, or Mr. Shah is the beneficial owner of such securities for any other purpose.</amountBeneficiallyOwned>    <classPercent>Row 11 of each Reporting Person's cover page to this Schedule 13G sets forth the percentages of shares of common stock of the Issuer beneficially owned by such Reporting Person and is incorporated by reference. Such percentage is based upon 37,750,162 shares of common stock outstanding as of October 31, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission (the "SEC") on November 6, 2025.</classPercent>
      <numberOfSharesPersonHas>
        <solePowerOrDirectToVote>Row 5 of each Reporting Person's cover page to this Schedule 13G sets forth the sole power to vote or to direct the vote of securities of the Issuer beneficially owned by such Reporting Person and is incorporated by reference.</solePowerOrDirectToVote>
        <sharedPowerOrDirectToVote>Row 6 of each Reporting Person's cover page to this Schedule 13G sets forth the shared power to vote or to direct the vote of securities of the Issuer beneficially owned by such Reporting Person and is incorporated by reference.</sharedPowerOrDirectToVote>
        <solePowerOrDirectToDispose>Row 7 of each Reporting Person's cover page to this Schedule 13G sets forth the sole power to dispose or to direct the disposition of securities of the Issuer beneficially owned by such Reporting Person and is incorporated by reference.</solePowerOrDirectToDispose>
        <sharedPowerOrDirectToDispose>Row 8 of each Reporting Person's cover page to this Schedule 13G sets forth the shared power to dispose or to direct the disposition of securities of the Issuer beneficially owned by such Reporting Person and is incorporated by reference.</sharedPowerOrDirectToDispose>
      </numberOfSharesPersonHas>
    </item4>


        <item5>
	          <notApplicableFlag>Y</notApplicableFlag>


    </item5>


        <item6>
	  	  <notApplicableFlag>Y</notApplicableFlag>
		        </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 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>RA Capital Management, L.P.</reportingPersonName>

      <signatureDetails>
        <signature>/s/ Peter Kolchinsky</signature>
        <title>By Peter Kolchinsky, Authorized Signatory</title>
        <date>01/07/2026</date>
      </signatureDetails>

    </signatureInformation>
	     <signatureInformation>
      <reportingPersonName>Peter Kolchinsky </reportingPersonName>

      <signatureDetails>
        <signature>/s/ Peter Kolchinsky</signature>
        <title>Peter Kolchinsky</title>
        <date>01/07/2026</date>
      </signatureDetails>

    </signatureInformation>
	     <signatureInformation>
      <reportingPersonName>Rajeev Shah</reportingPersonName>

      <signatureDetails>
        <signature>/s/ Rajeev Shah</signature>
        <title>Rajeev Shah</title>
        <date>01/07/2026</date>
      </signatureDetails>

    </signatureInformation>
	     <signatureInformation>
      <reportingPersonName>RA Capital Healthcare Fund, L.P.</reportingPersonName>

      <signatureDetails>
        <signature>/s/ Peter Kolchinsky</signature>
        <title>By RA Capital Healthcare Fund GP, LLC, its General Partner, By Peter Kolchinsky, Manager</title>
        <date>01/07/2026</date>
      </signatureDetails>

    </signatureInformation>



  </formData>


    </edgarSubmission>
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</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>ex-99-01072026_090121.htm
<DESCRIPTION>JOINT FILING AGREEMENT
<TEXT>
<!DOCTYPE html PUBLIC "-//IETF//DTD HTML//EN">
<html><head><title>ex-99-01072026_090121.htm</title></head><body style="margin-top:0;font-family:Times New Roman; font-size:10pt; color:#000000">
<p style="margin:0px" align="right"><b>EXHIBIT 99.1</b></p>
<p style="margin:0px" align="right"><br></p>
<p style="margin:0px" align="center"><b>JOINT FILING AGREEMENT</b></p>
<p style="margin:0px"><br></p>
<p style="margin:0px" align="justify">This Joint Filing Agreement, dated as of January 7, 2026, is by and among RA Capital Management, L.P., Peter Kolchinsky, Rajeev Shah and RA Capital Healthcare Fund, L.P. (the foregoing are collectively referred to herein as the <font style="font-family:Arial Unicode MS,Times New Roman">&ldquo;</font>Filers<font style="font-family:Arial Unicode MS,Times New Roman">&rdquo;</font>). </p>
<p style="margin:0px" align="justify"><br></p>
<p style="margin:0px" align="justify">Each of the Filers may be required to file with the United States Securities and Exchange Commission a statement on Schedule 13G and/or 13D with respect to the common stock, $0.0001 par value per share of Disc Medicine, Inc. beneficially owned by them from time to time.</p>
<p style="margin:0px" align="justify"><br></p>
<p style="margin:0px" align="justify">Pursuant to and in accordance with Rule 13(d)(1)(k) promulgated under the Securities Exchange Act of 1934, as amended, the Filers hereby agree to file a single statement on Schedule 13G and/or 13D (and any amendments thereto) on behalf of each of such parties, and hereby further agree to file this Joint Filing Agreement as an exhibit to such statement, as required by such rule.</p>
<p style="margin:0px" align="justify"><br></p>
<p style="margin:0px" align="justify">This Joint Filing Agreement may be terminated by any of the Filers upon one week<font style="font-family:Arial Unicode MS,Times New Roman">&rsquo;</font>s prior written notice or such lesser period of notice as the Filers may mutually agree.</p>
<p style="margin:0px"><br></p>
<p style="margin:0px">Executed and delivered as of the date first above written.</p>
<p style="margin:0px"><br></p>
<p style="margin:0px"><br></p>
<p style="margin:0px"><b>RA CAPITAL MANAGEMENT, L.P.</b></p>
<p style="margin:0px"><br></p>
<p style="margin-top:0px; margin-bottom:-2px; width:48px; float:left">By:</p>
<p style="margin:0px; text-indent:-2px"><u>/s/ Peter Kolchinsky</u></p>
<p style="margin-top:0px; margin-bottom:-2px; text-indent:48px; width:96px; clear:left; float:left">Name:</p>
<p style="margin:0px; padding-left:48px; text-indent:-2px">Peter Kolchinsky</p>
<p style="margin-top:0px; margin-bottom:-2px; text-indent:48px; width:96px; clear:left; float:left">Title:</p>
<p style="margin:0px; padding-left:48px; text-indent:-2px">Authorized Signatory</p>
<p style="margin:0px; clear:left"><br></p>
<p style="margin:0px"><br></p>
<p style="margin:0px"><b>PETER KOLCHINSKY</b></p>
<p style="margin:0px"><br></p>
<p style="margin:0px"><u>/s/ Peter Kolchinsky</u></p>
<p style="margin:0px"><br></p>
<p style="margin:0px"><br></p>
<p style="margin:0px"><b>RAJEEV SHAH</b></p>
<p style="margin:0px"><br></p>
<p style="margin:0px"><u>/s/ Rajeev Shah</u></p>
<p style="margin:0px"><br></p>
<p style="margin:0px"><br></p>
<p style="margin:0px"><b>RA CAPITAL HEALTHCARE FUND, L.P.</b></p>
<p style="margin:0px"><br></p>
<p style="margin-top:0px; margin-bottom:-2px; width:48px; float:left">By:</p>
<p style="margin:0px; text-indent:-2px">RA Capital Healthcare Fund GP, LLC</p>
<p style="margin-top:0px; margin-bottom:-2px; width:48px; clear:left; float:left">Its:</p>
<p style="margin:0px; text-indent:-2px">General Partner</p>
<p style="margin:0px; clear:left"><br></p>
<p style="margin-top:0px; margin-bottom:-2px; width:48px; float:left">By:</p>
<p style="margin:0px; text-indent:-2px"><u>/s/ Peter Kolchinsky</u></p>
<p style="margin-top:0px; margin-bottom:-2px; text-indent:48px; width:96px; clear:left; float:left">Name:</p>
<p style="margin:0px; padding-left:48px; text-indent:-2px">Peter Kolchinsky</p>
<p style="margin-top:0px; margin-bottom:-2px; text-indent:48px; width:96px; clear:left; float:left">Title:</p>
<p style="margin:0px; padding-left:48px; text-indent:-2px">Manager</p>
<p style="margin:0px; clear:left"><br></p>
<p style="margin:0px"><br></p>
<p style="margin-top:0px; margin-bottom:13.333px"><br></p>
<p style="margin-top:0px; margin-bottom:13.333px"><br></p>
</body></html>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
