<SEC-DOCUMENT>0001144204-17-044233.txt : 20170818
<SEC-HEADER>0001144204-17-044233.hdr.sgml : 20170818
<ACCEPTANCE-DATETIME>20170818180109
ACCESSION NUMBER:		0001144204-17-044233
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20170816
FILED AS OF DATE:		20170818
DATE AS OF CHANGE:		20170818

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			KLEMP WALTER V
		CENTRAL INDEX KEY:			0000938419

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37758
		FILM NUMBER:		171041858

	MAIL ADDRESS:	
		STREET 1:		1415 WEST LOOP NORTH
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77055

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Moleculin Biotech, Inc.
		CENTRAL INDEX KEY:			0001659617
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				474671999
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2575 WEST BELLFORT
		STREET 2:		SUITE 333
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77054
		BUSINESS PHONE:		713-300-5160

	MAIL ADDRESS:	
		STREET 1:		2575 WEST BELLFORT
		STREET 2:		SUITE 333
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77054
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>v473535_4.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-08-16</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001659617</issuerCik>
        <issuerName>Moleculin Biotech, Inc.</issuerName>
        <issuerTradingSymbol>MBRX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000938419</rptOwnerCik>
            <rptOwnerName>KLEMP WALTER V</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O MOLECULIN BIOTECH, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>2575 WEST BELLFORT, SUITE 333</rptOwnerStreet2>
            <rptOwnerCity>HOUSTON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77054</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Executive Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-08-16</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>100000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.703</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>967724</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The reporting person entered into a private sale agreement for the shares of common stock set forth in the table. The 12,000 shares of common stock purchased by the reporting person on May 11, 2017 are a matching transaction under Section 16 of the Securities Exchange Act of 1934 with 12,000 shares of common stock sold by the reporting person as set forth in the table above. In Accordance with Section 16, the reporting person will disgorge to the issuer an aggregate short-swing profit of $10,716.</footnote>
        <footnote id="F2">In addition to the shares held directly by the reporting person, the reporting person is the majority shareholder and control person of Annamed, Inc. Annamed, Inc. holds 1,425,000 shares of Issuer common stock. The Pursuant to General Instruction 5(b)(iv) of Form 3, the amount set forth in the table represents the reporting person's proportionate interest in the Issuer common stock beneficially owned by Annamed, Inc.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Walter Klemp</signatureName>
        <signatureDate>2017-08-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
