<SEC-DOCUMENT>0001222527-12-000003.txt : 20121220
<SEC-HEADER>0001222527-12-000003.hdr.sgml : 20121220
<ACCEPTANCE-DATETIME>20121220171126
ACCESSION NUMBER:		0001222527-12-000003
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20121220
FILED AS OF DATE:		20121220
DATE AS OF CHANGE:		20121220

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:		121278001

	MAIL ADDRESS:	
		STREET 1:		1220 W AVENUE J
		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
		STREET 2:		*
		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>2012-12-20</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 STREET 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>CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Simulations Plus, Inc. common stock</value>
                <footnoteId id="F5"/>
            </securityTitle>
            <transactionDate>
                <value>2012-12-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>68503</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>4.255</value>
                    <footnoteId id="F6"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6277909</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee stock options for Simulations Plus common stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>1.98</value>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2012-12-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>128000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.98</value>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2012-12-16</value>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <value>2014-12-16</value>
                <footnoteId id="F4"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Employee stock options for Simulations Plus common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>128000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>112000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Average price for options granted on three different dates at three different prices, each issued at 110% of the Market closing price on the date of the respective grants:
20,000 shares exercisable at $3.25 on 12/19/2012 from a total grant of 100,000 options on 12/19/2011
100,000 shares exercisable at $1.62 on 12/16/2012 from a total grant of 100,000 options on 12/16/2009
8,000 shares exercisable at $3.27 on 11/30/2011 from a total grant of 20,000 options on 11/30/2010</footnote>
        <footnote id="F2">Conversion of 128,000 options to 68,503 shares via cashless exercise.</footnote>
        <footnote id="F3">Three different option grants, each issued at 110% of the Market closing price on the date of the respective grants:
20,000 shares exercisable at $3.25 on 12/19/2012 from a total grant of 100,000 options on 12/19/2011
100,000 shares exercisable at $1.62 on 12/16/2012 from a total grant of 100,000 options on 12/16/2009
8,000 shares exercisable at $3.27 on 11/30/2011 from a total grant of 20,000 options on 11/30/2010</footnote>
        <footnote id="F4">Three different option grants, with expiration dates as follows:
20,000 shares exercisable at $3.25 on 12/19/2012 from a total grant of 100,000 on 12/19/2011, with an expiration date of 12/19/2016.
100,000 shares exercisable at $1.62 on 12/16/2012 from a total grant of 100,000 shares on 12/16/2009, with an expiration date of 12/16/2014.
8,000 shares exercisable at $3.27 on 11/30/2011 from a total grant of 20,000 shares on 11/30/2010, with an expiration date of 11/30/2015.</footnote>
        <footnote id="F5">From exercise of 128,000 employee stock options as described elsewhere on this Form 4.</footnote>
        <footnote id="F6">Average of Market high and low share prices for SLP common stock on 12/18/2012.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Walter S. Woltosz</signatureName>
        <signatureDate>2012-12-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
