-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 W0CEvBZYbDDN8wCyTcnp7Qw5g141d1g9oiuhNkWKaJQFYCTYGcebJUpoYAmuAVwa
 h5WiJ1Bb3rv4wk9uef2qJA==

<SEC-DOCUMENT>0001181431-05-047928.txt : 20050819
<SEC-HEADER>0001181431-05-047928.hdr.sgml : 20050819
<ACCEPTANCE-DATETIME>20050819132613
ACCESSION NUMBER:		0001181431-05-047928
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050817
FILED AS OF DATE:		20050819
DATE AS OF CHANGE:		20050819

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PANACOS PHARMACEUTICALS, INC.
		CENTRAL INDEX KEY:			0001040017
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				113238476
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		134 COOLIDGE AVE
		CITY:			WATERTOWN
		STATE:			MA
		ZIP:			02472
		BUSINESS PHONE:		617-926-1551

	MAIL ADDRESS:	
		STREET 1:		134 COOLIDGE AVE
		CITY:			WATERTOWN
		STATE:			MA
		ZIP:			02472

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	V I TECHNOLOGIES INC
		DATE OF NAME CHANGE:	19980209

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MARSHALL PEYTON J
		CENTRAL INDEX KEY:			0001212229

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24241
		FILM NUMBER:		051038001

	BUSINESS ADDRESS:	
		STREET 1:		C/O EPIX MEDICAL INC
		STREET 2:		71 ROGERS ST
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142
		BUSINESS PHONE:		6172506000

	MAIL ADDRESS:	
		STREET 1:		C/O EPIX MEDICAL INC
		STREET 2:		71 ROGERS ST
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>rrd89996.xml
<DESCRIPTION>PEYTON MARSHALL 8 17 05 FORM 3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2005-08-17</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001040017</issuerCik>
        <issuerName>PANACOS PHARMACEUTICALS, INC.</issuerName>
        <issuerTradingSymbol>PANC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001212229</rptOwnerCik>
            <rptOwnerName>MARSHALL PEYTON J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PANACOS PHARMACEUTICALS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>134 COOLIDGE AVENUE</rptOwnerStreet2>
            <rptOwnerCity>WATERTOWN</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02472</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle>Chief Financial Officer</officerTitle>
            <otherText>Secretary and Treasurer</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <ownerSignature>
        <signatureName>/s/ Peyton J. Marshall,  Ph.D.</signatureName>
        <signatureDate>2005-08-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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