-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 WTq1PI3k4r/sXZP/qADSTx0pJjD5NnVacUO+pPBZ2IOh+FiC0hN0NTvj8vTImZ1j
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<SEC-DOCUMENT>0000919574-10-002742.txt : 20100325
<SEC-HEADER>0000919574-10-002742.hdr.sgml : 20100325
<ACCEPTANCE-DATETIME>20100325172643
ACCESSION NUMBER:		0000919574-10-002742
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100323
FILED AS OF DATE:		20100325
DATE AS OF CHANGE:		20100325

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SALVATORE MUOIO
		CENTRAL INDEX KEY:			0001259267

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-30865
		FILM NUMBER:		10705303

	MAIL ADDRESS:	
		STREET 1:		C/O S. MUOIO & CO. LLC
		STREET 2:		509 MADISON AVENUE SUITE 406
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SOAPSTONE NETWORKS INC.
		CENTRAL INDEX KEY:			0001094895
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		IRS NUMBER:				020493372
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		296 CONCORD ROAD
		STREET 2:		SUITE 308
		CITY:			BILLERICA
		STATE:			MA
		ZIP:			01821
		BUSINESS PHONE:		978 715-2337

	MAIL ADDRESS:	
		STREET 1:		296 CONCORD ROAD
		STREET 2:		SUITE 308
		CITY:			BILLERICA
		STATE:			MA
		ZIP:			01821

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	AVICI SYSTEMS INC
		DATE OF NAME CHANGE:	20000516

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			S. MUOIO & CO. LLC
		CENTRAL INDEX KEY:			0001138996

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-30865
		FILM NUMBER:		10705304

	BUSINESS ADDRESS:	
		STREET 1:		509 MADISON AVE SUITE 406
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
		BUSINESS PHONE:		212-297-2555

	MAIL ADDRESS:	
		STREET 1:		509 MADISON AVENUE
		STREET 2:		SUITE 406
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

	FORMER NAME:	
		FORMER CONFORMED NAME:	S MUOIO & CO LLC
		DATE OF NAME CHANGE:	20010420
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>p1085065.xml
<DESCRIPTION>MUOIO/SOAPSTONE
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-03-23</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001094895</issuerCik>
        <issuerName>SOAPSTONE NETWORKS INC.</issuerName>
        <issuerTradingSymbol>SOAP.PK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001138996</rptOwnerCik>
            <rptOwnerName>S. MUOIO &amp; CO. LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>509 MADISON AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 406</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001259267</rptOwnerCik>
            <rptOwnerName>SALVATORE MUOIO</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O S. MUOIO &amp; CO. LLC</rptOwnerStreet1>
            <rptOwnerStreet2>509 MADISON AVENUE, SUITE 406</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-03-23</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>75000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.77</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2382828</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-03-24</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>97603</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.76</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2480431</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">These securities are held in the accounts of several investment partnerships and investment funds (collectively, the &quot;Investment Vehicles&quot;) for which S. Muoio &amp; Co.
LLC (&quot;SMC&quot;) serves as either general partner or investment manager.  Salvatore Muoio is the managing member of SMC.  SMC and Mr. Muoio may be deemed to
beneficially own the securities held by the Investment Vehicles by virtue of SMC's position as general partner or investment manager of the Investment Vehicles and
Mr. Muoio's status as the managing member of SMC.</footnote>
    </footnotes>

    <remarks>(+)  Each of the Reporting Person and the joint filer (individually, each a &quot;Reporting Person&quot; and collectively, the &quot;Reporting Persons&quot;) disclaims beneficial ownership of the reported securities except to the extent of his or its pecuniary interest therein.  The Reporting Persons affirmatively disclaim being a &quot;group&quot; for purposes of Section 16 of the Securities Exchange Act of 1934, as amended.</remarks>

    <ownerSignature>
        <signatureName>S. Muoio &amp; Co. LLC(+), By: /s/ Salvatore Muoio, Managing Member</signatureName>
        <signatureDate>2010-03-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Salvatore Muoio(+)</signatureName>
        <signatureDate>2010-03-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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