<SEC-DOCUMENT>0000201772-19-000004-index.html : 20190207
<SEC-HEADER>0000201772-19-000004.hdr.sgml : 20190207
<ACCEPTANCE-DATETIME>20190207135659
ACCESSION NUMBER:		0000201772-19-000004
CONFORMED SUBMISSION TYPE:	13F-HR/A
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20181231
FILED AS OF DATE:		20190207
DATE AS OF CHANGE:		20190207
EFFECTIVENESS DATE:		20190207

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ESSEX INVESTMENT MANAGEMENT CO LLC
		CENTRAL INDEX KEY:			0000201772
		IRS NUMBER:				004260191
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1130

	FILING VALUES:
		FORM TYPE:		13F-HR/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	028-00878
		FILM NUMBER:		19574566

	BUSINESS ADDRESS:	
		STREET 1:		125 HIGH STREET
		STREET 2:		SUITE 1803
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
		BUSINESS PHONE:		6174824870

	MAIL ADDRESS:	
		STREET 1:		125 HIGH STREET
		STREET 2:		SUITE 1803
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ESSEX INVESTMENT MANAGEMENT CO INC
		DATE OF NAME CHANGE:	19920929
</SEC-HEADER>
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<TYPE>13F-HR/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
Document 1 - file: primary_doc.html

Document 1 - RAW XML: primary_doc.xml

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<DOCUMENT>
<TYPE>INFORMATION TABLE
<SEQUENCE>2
<FILENAME>essex13f2018q4amend1.xml
<TEXT>
Document 2 - file: essex13f2018q4amend1.html

Document 2 - RAW XML: essex13f2018q4amend1.xml

</DOCUMENT>
</SEC-DOCUMENT>