<SEC-DOCUMENT>0001222526-17-000008.txt : 20171218
<SEC-HEADER>0001222526-17-000008.hdr.sgml : 20171218
<ACCEPTANCE-DATETIME>20171218133404
ACCESSION NUMBER:		0001222526-17-000008
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20171128
FILED AS OF DATE:		20171218
DATE AS OF CHANGE:		20171218

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			WOLTOSZ WALTER S
		CENTRAL INDEX KEY:			0001222526

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32046
		FILM NUMBER:		171261006

	MAIL ADDRESS:	
		STREET 1:		42505 10TH ST. WEST
		CITY:			LANCASTER
		STATE:			CA
		ZIP:			93534

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SIMULATIONS PLUS INC
		CENTRAL INDEX KEY:			0001023459
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER INTEGRATED SYSTEMS DESIGN [7373]
		IRS NUMBER:				954595609
		FISCAL YEAR END:			0831

	BUSINESS ADDRESS:	
		STREET 1:		42505 10TH STREET WEST
		CITY:			LANCASTER
		STATE:			CA
		ZIP:			93534-7059
		BUSINESS PHONE:		661-723-7723

	MAIL ADDRESS:	
		STREET 1:		42505 10TH STREET WEST
		CITY:			LANCASTER
		STATE:			CA
		ZIP:			93534-7059
</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>2017-11-28</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001023459</issuerCik>
        <issuerName>SIMULATIONS PLUS INC</issuerName>
        <issuerTradingSymbol>SLP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001222526</rptOwnerCik>
            <rptOwnerName>WOLTOSZ WALTER S</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>42505 10TH ST. WEST</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LANCASTER</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>93534</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman and CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Simulations Plus, Inc. common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-11-28</value>
                <footnoteId id="F2"/>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>G</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>90000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>15.9</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5520916</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Adjusted close on Nov 28, 2017 when shares were finally transferred to Auburn University. Irrevocable gift instructions were sent to brokerage account on November 8, 2017 when closing price was $16.55.</footnote>
        <footnote id="F2">Irrevocable instructions for annual gift to Auburn University were sent to brokerage firm on November 8, but shares did not transfer until November 28.</footnote>
    </footnotes>

    <remarks>Annual gift from shareholders to Auburn University Foundation to meet donation commitments for various university programs and facilities. Forgot to file and then had problems with Edgar filing website.</remarks>

    <ownerSignature>
        <signatureName>Walter S Woltosz</signatureName>
        <signatureDate>2017-12-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Virginia E Woltosz</signatureName>
        <signatureDate>2017-12-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
