<SEC-DOCUMENT>0001250853-17-000110.txt : 20171227
<SEC-HEADER>0001250853-17-000110.hdr.sgml : 20171227
<ACCEPTANCE-DATETIME>20171227181218
ACCESSION NUMBER:		0001250853-17-000110
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20171227
FILED AS OF DATE:		20171227
DATE AS OF CHANGE:		20171227

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Cola Mark
		CENTRAL INDEX KEY:			0001698162

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38015
		FILM NUMBER:		171276847

	MAIL ADDRESS:	
		STREET 1:		3900 PASEO DEL SOL
		CITY:			SANTA FE
		STATE:			NM
		ZIP:			87507

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SIGMA LABS, INC.
		CENTRAL INDEX KEY:			0000788611
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS MANUFACTURING INDUSTRIES [3990]
		IRS NUMBER:				820404220
		STATE OF INCORPORATION:			NV
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3900 PASEO DEL SOL
		CITY:			SANTE FE
		STATE:			NM
		ZIP:			87507
		BUSINESS PHONE:		(505) 438-2576

	MAIL ADDRESS:	
		STREET 1:		3900 PASEO DEL SOL
		CITY:			SANTE FE
		STATE:			NM
		ZIP:			87507

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FRAMEWAVES INC
		DATE OF NAME CHANGE:	20010130

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MESSIDOR LTD
		DATE OF NAME CHANGE:	20010122
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-12-27</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000788611</issuerCik>
        <issuerName>SIGMA LABS, INC.</issuerName>
        <issuerTradingSymbol>SGLB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001698162</rptOwnerCik>
            <rptOwnerName>Cola Mark</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3900 PASEO DEL SOL</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SANTA FE</rptOwnerCity>
            <rptOwnerState>NM</rptOwnerState>
            <rptOwnerZipCode>87507</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President and CTO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-12-22</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>7874</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.25</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Spouse</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>160080</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By The Mark and Amanda Cola Revocable Trust, U/A August 31, 2012</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.21 to $3.28, inclusive. The reporting person undertakes to provide to Sigma Labs, Inc., any security holder of Sigma Labs, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (1) to this Form 4.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Mark Cola</signatureName>
        <signatureDate>2017-12-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
