<SEC-DOCUMENT>0001104659-18-027869-index.html : 20180427
<SEC-HEADER>0001104659-18-027869.hdr.sgml : 20180427
<ACCEPTANCE-DATETIME>20180427172456
ACCESSION NUMBER:		0001104659-18-027869
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		5
FILED AS OF DATE:		20180427
DATE AS OF CHANGE:		20180427
EFFECTIVENESS DATE:		20180427

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			VASCO DATA SECURITY INTERNATIONAL INC
		CENTRAL INDEX KEY:			0001044777
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER INTEGRATED SYSTEMS DESIGN [7373]
		IRS NUMBER:				364169320
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24389
		FILM NUMBER:		18785655

	BUSINESS ADDRESS:	
		STREET 1:		1901 SOUTH MYERS ROAD
		STREET 2:		SUITE 210
		CITY:			OAKBROOK TERRACE
		STATE:			IL
		ZIP:			60181
		BUSINESS PHONE:		6309328844

	MAIL ADDRESS:	
		STREET 1:		1919 S HIGHLAND AVE
		STREET 2:		STE 118 C
		CITY:			LOMBARD
		STATE:			IL
		ZIP:			60148
</SEC-HEADER>
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<TYPE>DEFA14A
<SEQUENCE>1
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<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: a18-12251_2defa14a.htm

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<SEQUENCE>2
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<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g122512cci001.gif

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<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g122512cai001.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g122512cai001.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g122512cgi001.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g122512cgi001.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g122512cei001.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g122512cei001.gif

</DOCUMENT>
</SEC-DOCUMENT>