<SEC-DOCUMENT>0000899243-19-022541.txt : 20190827
<SEC-HEADER>0000899243-19-022541.hdr.sgml : 20190827
<ACCEPTANCE-DATETIME>20190827193458
ACCESSION NUMBER:		0000899243-19-022541
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20190816
FILED AS OF DATE:		20190827
DATE AS OF CHANGE:		20190827

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Pfeiffer Wendy
		CENTRAL INDEX KEY:			0001786612

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35662
		FILM NUMBER:		191058896

	MAIL ADDRESS:	
		STREET 1:		C/O QUALYS, INC.
		STREET 2:		919 E. HILLSDALE BOULEVARD
		CITY:			FOSTER CITY
		STATE:			CA
		ZIP:			94404

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			QUALYS, INC.
		CENTRAL INDEX KEY:			0001107843
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		IRS NUMBER:				770534145
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		919 E. HILLSDALE BLVD.
		CITY:			FOSTER CITY
		STATE:			CA
		ZIP:			94404
		BUSINESS PHONE:		650-801-6100

	MAIL ADDRESS:	
		STREET 1:		919 E. HILLSDALE BLVD.
		CITY:			FOSTER CITY
		STATE:			CA
		ZIP:			94404

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	QUALYS INC
		DATE OF NAME CHANGE:	20000225
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>doc3.xml
<DESCRIPTION>FORM 3 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2019-08-16</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001107843</issuerCik>
        <issuerName>QUALYS, INC.</issuerName>
        <issuerTradingSymbol>QLYS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001786612</rptOwnerCik>
            <rptOwnerName>Pfeiffer Wendy</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O QUALYS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>919 E. HILLSDALE BLVD.</rptOwnerStreet2>
            <rptOwnerCity>FOSTER CITY</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94404</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <remarks>Exhibit 24 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ Bruce Posey, by Power of Attorney for Wendy M. Pfeiffer</signatureName>
        <signatureDate>2019-08-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>attachment1.htm
<DESCRIPTION>EX-24 DOCUMENT
<TEXT>
<HTML>
<HEAD>
</HEAD>
<BODY>
<PRE>
                               POWER OF ATTORNEY

       The undersigned, as a Section 16 reporting person of Qualys, Inc.
(the "Company"), hereby constitutes and appoints Bruce Posey, as the
undersigned's true and lawful attorney-in-fact to:

       1.  complete and execute Forms 3, 4 and 5 and other forms and all
           amendments thereto as such attorney-in-fact shall in his discretion
           determine to be required or advisable pursuant to Section 16 of the
           Securities Exchange Act of 1934 (as amended) and the rules and
           regulations promulgated thereunder, or any successor laws and
           regulations, as a consequence of the undersigned's ownership,
           acquisition or disposition of securities of the Company; and

       2.  do all acts necessary in order to file such forms with the SEC, any
           securities exchange or national association, the Company and such
           other person or agency as the attorney-in-fact shall deem
           appropriate.

       The undersigned hereby ratifies and confirms all that said attorney-in-
fact and agents shall do or cause to be done by virtue hereof.  The undersigned
acknowledges that the foregoing attorney-in-fact, in serving in such capacity at
the request of the undersigned, is not assuming, nor is the Company assuming,
any of the undersigned's responsibilities to comply with Section 16 of the
Securities Exchange Act of 1934 (as amended).

       This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
Company and the foregoing attorney-in-fact.

       IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 22nd day of August, 2019.


                                         Signature:     /s/ Wendy M. Pfeiffer
                                                   -----------------------------
                                         Print Name: Wendy M. Pfeiffer





</PRE>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
