<SEC-DOCUMENT>0001562180-20-005720.txt : 20200901
<SEC-HEADER>0001562180-20-005720.hdr.sgml : 20200901
<ACCEPTANCE-DATETIME>20200901160458
ACCESSION NUMBER:		0001562180-20-005720
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20200831
FILED AS OF DATE:		20200901
DATE AS OF CHANGE:		20200901

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Burwick David A
		CENTRAL INDEX KEY:			0001318320

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14092
		FILM NUMBER:		201154509

	MAIL ADDRESS:	
		STREET 1:		32 AUTUMN LANE
		CITY:			NEW CANAAN
		STATE:			CT
		ZIP:			06840

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BOSTON BEER CO INC
		CENTRAL INDEX KEY:			0000949870
		STANDARD INDUSTRIAL CLASSIFICATION:	MALT BEVERAGES [2082]
		IRS NUMBER:				043284048
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1226

	BUSINESS ADDRESS:	
		STREET 1:		ONE DESIGN CENTER PLACE
		STREET 2:		SUITE 850
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
		BUSINESS PHONE:		617-368-5056

	MAIL ADDRESS:	
		STREET 1:		ONE DESIGN CENTER PLACE
		STREET 2:		SUITE 850
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primarydocument.xml
<DESCRIPTION>PRIMARY DOCUMENT
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        <issuerName>BOSTON BEER CO INC</issuerName>
        <issuerTradingSymbol>SAM</issuerTradingSymbol>
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        <reportingOwnerId>
            <rptOwnerCik>0001318320</rptOwnerCik>
            <rptOwnerName>Burwick David A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE BOSTON BEER COMPANY, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>ONE DESIGN CENTER PLACE, SUITE 850</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02210</rptOwnerZipCode>
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            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>President and CEO</officerTitle>
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                <transactionPricePerShare>
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        <nonDerivativeTransaction>
            <securityTitle>
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            <transactionDate>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
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                    <value>100.00</value>
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                <transactionPricePerShare>
                    <value>874.65</value>
                    <footnoteId id="F6"/>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>400.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>876.29</value>
                    <footnoteId id="F7"/>
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                <transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
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            <transactionDate>
                <value>2020-08-31</value>
            </transactionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F1"/>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>387.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>878.83</value>
                    <footnoteId id="F8"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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                    <footnoteId id="F2"/>
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        <nonDerivativeTransaction>
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                <footnoteId id="F1"/>
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            <transactionAmounts>
                <transactionShares>
                    <value>613.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>880.20</value>
                    <footnoteId id="F9"/>
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                <transactionAcquiredDisposedCode>
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        <nonDerivativeTransaction>
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            <transactionDate>
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                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F1"/>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>980.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>880.80</value>
                    <footnoteId id="F10"/>
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                <transactionAcquiredDisposedCode>
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                <footnoteId id="F1"/>
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            <transactionAmounts>
                <transactionShares>
                    <value>378.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>881.97</value>
                    <footnoteId id="F11"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
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                <sharesOwnedFollowingTransaction>
                    <value>55598.00</value>
                    <footnoteId id="F2"/>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
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            <transactionDate>
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            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <transactionCode>S</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F1"/>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>877.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>883.13</value>
                    <footnoteId id="F12"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                <sharesOwnedFollowingTransaction>
                    <value>54721.00</value>
                    <footnoteId id="F2"/>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common</value>
            </securityTitle>
            <transactionDate>
                <value>2020-08-31</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>365.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>885.39</value>
                    <footnoteId id="F13"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>54356.00</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common</value>
            </securityTitle>
            <transactionDate>
                <value>2020-08-31</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>100.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>884.87</value>
                    <footnoteId id="F14"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>54256.00</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>80.525</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2020-08-31</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5000.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2011-05-25</value>
            </exerciseDate>
            <expirationDate>
                <value>2021-05-24</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5000.00</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on July 29, 2020.</footnote>
        <footnote id="F10">The price shown is the weighted average sale price for the transactions reported on this line. The range of sale prices for the 980 shares is from $880.51 to $881.20. The Filing Person will provide full information regarding the number of shares sold at each separate price upon request of the SEC, the Registrant, or a shareholder of the Registrant.</footnote>
        <footnote id="F11">The price shown is the weighted average sale price for the transactions reported on this line. The range of sale prices for the 378 shares is from $881.51 to $882.45. The Filing Person will provide full information regarding the number of shares sold at each separate price upon request of the SEC, the Registrant, or a shareholder of the Registrant.</footnote>
        <footnote id="F12">The price shown is the weighted average sale price for the transactions reported on this line. The range of sale prices for the 877 shares is from $882.67 to $883.56. The Filing Person will provide full information regarding the number of shares sold at each separate price upon request of the SEC, the Registrant, or a shareholder of the Registrant.</footnote>
        <footnote id="F13">The price shown is the weighted average sale price for the transactions reported on this line. The range of sale prices for the 365 shares is from $883.75 to $884.65. The Filing Person will provide full information regarding the number of shares sold at each separate price upon request of the SEC, the Registrant, or a shareholder of the Registrant.</footnote>
        <footnote id="F14">The price shown is the weighted average sale price for the transactions reported on this line. The range of sale prices for the 100 shares is from $884.82 to $885.41. The Filing Person will provide full information regarding the number of shares sold at each separate price upon request of the SEC, the Registrant, or a shareholder of the Registrant.</footnote>
        <footnote id="F2">The shares reported include 32,062 shares of restricted stock subject to vesting conditions.</footnote>
        <footnote id="F3">The price shown is the weighted average sale price for the transactions reported on this line. The range of sale prices for the 400 shares is from $870.11 to $870.53. The Filing Person will provide full information regarding the number of shares sold at each separate price upon request of the SEC, the Registrant, or a shareholder of the Registrant.</footnote>
        <footnote id="F4">The price shown is the weighted average sale price for the transactions reported on this line. The range of sale prices for the 200 shares is from $872.03 to $872.33. The Filing Person will provide full information regarding the number of shares sold at each separate price upon request of the SEC, the Registrant, or a shareholder of the Registrant.</footnote>
        <footnote id="F5">The price shown is the weighted average sale price for the transactions reported on this line. The range of sale prices for the 200 shares is from $873.43 to $874.32. The Filing Person will provide full information regarding the number of shares sold at each separate price upon request of the SEC, the Registrant, or a shareholder of the Registrant.</footnote>
        <footnote id="F6">The price shown is the weighted average sale price for the transactions reported on this line. The range of sale prices for the 100 shares is from $874.65 to $874.65. The Filing Person will provide full information regarding the number of shares sold at each separate price upon request of the SEC, the Registrant, or a shareholder of the Registrant.</footnote>
        <footnote id="F7">The price shown is the weighted average sale price for the transactions reported on this line. The range of sale prices for the 400 shares is from $875.80 to $876.78. The Filing Person will provide full information regarding the number of shares sold at each separate price upon request of the SEC, the Registrant, or a shareholder of the Registrant.</footnote>
        <footnote id="F8">The price shown is the weighted average sale price for the transactions reported on this line. The range of sale prices for the 387 shares is from $878.11 to $878.99. The Filing Person will provide full information regarding the number of shares sold at each separate price upon request of the SEC, the Registrant, or a shareholder of the Registrant.</footnote>
        <footnote id="F9">The price shown is the weighted average sale price for the transactions reported on this line. The range of sale prices for the 613 shares is from $879.46 to $880.40. The Filing Person will provide full information regarding the number of shares sold at each separate price upon request of the SEC, the Registrant, or a shareholder of the Registrant.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Michael G. Andrews under POA for the benefit of David A. Burwick</signatureName>
        <signatureDate>2020-09-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
