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ESSEX INVESTMENT MANAGEMENT CO LLC
- As of  06/06/25, 11:49:52 AM:   140 Insider Transactions.

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Buy/Sell* 1 Yr Return** Filed Date Subject Symbol Pct Owned Details
S 2012-06-08 16:48:17.0 Crumbs Bake Shop CRMB 4.5% view
S 2012-01-11 16:16:33.0 Crumbs Bake Shop CRMB 10.8% view
B 2011-08-10 09:25:35.0 57th Street General Acquisition Corp n/a 17.39% view
B -32.08% 2010-01-25 16:31:51.0 GSE SYSTEMS INC GVP 5.36% view
B 221.13% 2010-01-25 16:18:33.0 LECROY CORP LCRY 6.76% view
B 138.75% 2010-01-25 16:10:24.0 AMTECH SYSTEMS INC ASYS 8.11% view
B -10.76% 2010-01-25 16:07:30.0 TRANSCEND SERVICES INC TRCR 7.42% view
B -36.50% 2010-01-25 16:05:09.0 BioScrip BIOS 5.52% view
B 4.84% 2008-01-31 10:05:44.0 TRANSCEND SERVICES INC TRCR 6.16% view
B -60.47% 2008-01-31 10:05:02.0 AMTECH SYSTEMS INC ASYS 5.51% view
B -74.70% 2008-01-31 10:04:32.0 LECROY CORP LCRY 5.92% view
B -21.21% 2007-02-06 08:37:34.0 INTERACTIVE INTELLIGENCE INC ININ 5.38% view
S 2006-04-24 00:00:00.0 CYNOSURE INC CYNO 9.13% view
B -8.13% 2006-02-09 00:00:00.0 CYNOSURE INC CYNO 9.13% view
B 29.97% 2006-02-09 00:00:00.0 MWI Veterinary Supply MWIV 5.63% view
S 2006-02-09 00:00:00.0 MARCHEX INC MCHX 5.59% view
B 32.88% 2005-05-11 00:00:00.0 MARCHEX INC MCHX 7.045% view
B 32.88% 2005-05-11 00:00:00.0 MARCHEX INC MCHX 4.81% view
B 0.63% 2005-05-11 00:00:00.0 JUPITERMEDIA CORP JUPM 3.37% view
B 0.63% 2005-05-11 00:00:00.0 JUPITERMEDIA CORP JUPM 5.42% view
B -55.56% 2005-04-19 00:00:00.0 CITADEL SECURITY SOFTWARE INC cdss 5.04% view
B 22.72% 2005-04-19 00:00:00.0 MICROS SYSTEMS INC MCRS 5.78% view
B 22.72% 2005-04-19 00:00:00.0 MICROS SYSTEMS INC MCRS 4.0% view
B 61.88% 2005-04-19 00:00:00.0 COLDWATER CREEK INC CWTR 6.38% view
S 2005-04-19 00:00:00.0 COLDWATER CREEK INC CWTR 2.78% view
B 2005-04-19 00:00:00.0 CAPTIVA SOFTWARE CORP CPTV 9.98% view
S 2004-04-12 00:00:00.0 MCDATA CORP MCDT 10.967% view
S 2004-04-12 00:00:00.0 MCDATA CORP MCDT 8.49% view
S 2004-02-20 00:00:00.0 CACHE INC CACH 5.51% view
S 2004-02-20 00:00:00.0 MARTEK BIOSCIENCES CORP MATK 8.02% view
S 2004-02-20 00:00:00.0 MICROMUSE INC MUSE 6.27% view
S 2004-02-20 00:00:00.0 MARTEN TRANSPORT LTD MRTN 8.83% view
S 2004-02-20 00:00:00.0 INTRADO INC TRDO 6.42% view
S 2004-02-20 00:00:00.0 MICROSTRATEGY INC MSTR 5.34% view
S 2004-02-20 00:00:00.0 MERIX CORP MERX 7.14% view
S 2004-02-20 00:00:00.0 MCDATA CORP MCDT 11.17% view
S 2004-02-20 00:00:00.0 COLDWATER CREEK INC CWTR 5.61% view
S 2004-02-20 00:00:00.0 MAGMA DESIGN AUTOMATION INC LAVA 5.91% view
S 2004-02-20 00:00:00.0 QUEST SOFTWARE INC QSFT 6.03% view
B -37.21% 2004-02-02 00:00:00.0 CACHE INC CACH 5.51% view
B -17.50% 2004-02-02 00:00:00.0 MARTEK BIOSCIENCES CORP MATK 8.02% view
S 2004-02-02 00:00:00.0 MICROMUSE INC MUSE 6.27% view
B 32.91% 2004-02-02 00:00:00.0 MARTEN TRANSPORT LTD MRTN 8.83% view
B 2004-02-02 00:00:00.0 INTRADO INC TRDO 6.42% view
B 19.52% 2004-02-02 00:00:00.0 MICROSTRATEGY INC MSTR 5.34% view
B -65.23% 2004-02-02 00:00:00.0 MERIX CORP MERX 7.14% view
B -51.87% 2004-02-02 00:00:00.0 MCDATA CORP MCDT 11.17% view
B 84.14% 2004-02-02 00:00:00.0 COLDWATER CREEK INC CWTR 5.61% view
B -51.82% 2004-02-02 00:00:00.0 MAGMA DESIGN AUTOMATION INC LAVA 5.91% view
B -16.66% 2004-02-02 00:00:00.0 QUEST SOFTWARE INC QSFT 6.03% view
B 151.88% 2003-01-14 00:00:00.0 MARTEK BIOSCIENCES CORP MATK 6.79% view
S 2003-01-14 00:00:00.0 OSI SYSTEMS INC OSIS 9.02% view
B 0.11% 2003-01-14 00:00:00.0 MCDATA CORP MCDT 6.88% view
S 2002-12-09 00:00:00.0 OSI SYSTEMS INC OSIS 11.28% view
B 19.03% 2002-11-07 00:00:00.0 OSI SYSTEMS INC OSIS 15.0% view
S 2002-10-15 00:00:00.0 OSI SYSTEMS INC OSIS 14.2% view
B 0.52% 2002-09-05 00:00:00.0 OSI SYSTEMS INC OSIS 14.34% view
S 2002-08-16 00:00:00.0 OSI SYSTEMS INC OSIS 13.54% view
B -0.97% 2002-08-16 00:00:00.0 OSI SYSTEMS INC OSIS 14.9% view
B -0.97% 2002-08-16 00:00:00.0 OSI SYSTEMS INC OSIS 14.11% view
S 2002-08-15 00:00:00.0 OSI SYSTEMS INC OSIS 13.95% view
B -37.05% 2002-04-10 00:00:00.0 OSI SYSTEMS INC OSIS 13.97% view
S 2002-03-08 00:00:00.0 AMERICAN SCIENCE & ENGINEERING INC ASE 11.11% view
S 2002-03-08 00:00:00.0 OSI SYSTEMS INC OSIS 13.41% view
S 2002-02-11 00:00:00.0 AMERICAN SCIENCE & ENGINEERING INC ASE 14.52% view
B -15.99% 2002-02-11 00:00:00.0 OSI SYSTEMS INC OSIS 13.55% view
B 2002-01-10 00:00:00.0 VIISAGE TECHNOLOGY INC VISG 11.17% view
B 4.64% 2002-01-10 00:00:00.0 CALIFORNIA PIZZA KITCHEN INC CPKI 5.65% view
B 2002-01-10 00:00:00.0 SPECIALTY LABORATORIES sp 11.0% view
B 2002-01-10 00:00:00.0 AMERICAN SCIENCE & ENGINEERING INC ASE 14.57% view
B -25.80% 2002-01-10 00:00:00.0 WEBSENSE INC WBSN 9.86% view
B -1.15% 2002-01-10 00:00:00.0 OSI SYSTEMS INC OSIS 13.2% view
B 2001-11-14 00:00:00.0 MED medc 10.38% view
B -0.93% 2001-02-14 00:00:00.0 SUNRISE ASSISTED LIVING INC SRZ 5.94% view
B -68.89% 2001-02-14 00:00:00.0 PECO II INC PIII 7.39% view
B -55.80% 2001-02-14 00:00:00.0 CEPHEID cphd 9.23% view
S 2000-05-10 00:00:00.0 ESPEED INC ESPD 11.17% view
B -60.85% 2000-04-10 00:00:00.0 ESPEED INC ESPD 16.93% view
B -52.92% 2000-02-14 00:00:00.0 ESPEED INC ESPD 14.35% view
B -25.77% 2000-02-02 00:00:00.0 MIPS TECHNOLOGIES INC MIPS 6.43% view
B 2000-02-02 00:00:00.0 Z TEL TECHNOLOGIES INC ZTEL 5.52% view
B -81.43% 2000-02-02 00:00:00.0 NETOPIA INC NTPA 6.66% view
S 2000-02-02 00:00:00.0 MICROMUSE INC MUSE 7.55% view
B -66.21% 2000-02-02 00:00:00.0 DIGITAL INSIGHT CORP DGIN 7.63% view
S 2000-01-10 00:00:00.0 RAVISENT TECHNOLOGIES INC XEDA 10.32% view
S 2000-01-10 00:00:00.0 NET2PHONE INC NTOP 11.69% view
B -55.84% 2000-01-10 00:00:00.0 ESPEED INC ESPD 10.81% view
B 1999-12-15 00:00:00.0 RAVISENT TECHNOLOGIES INC XEDA 12.22% view
B 1999-12-15 00:00:00.0 NET2PHONE INC NTOP 17.74% view
S 1999-11-09 00:00:00.0 RAVISENT TECHNOLOGIES INC XEDA 10.11% view
S 1999-10-12 00:00:00.0 RAVISENT TECHNOLOGIES INC XEDA 11.79% view
S 1999-10-08 00:00:00.0 NET2PHONE INC NTOP 11.35% view
B 1999-09-10 00:00:00.0 RAVISENT TECHNOLOGIES INC XEDA 12.74% view
B 1999-09-10 00:00:00.0 NET2PHONE INC NTOP 11.35% view
S 1999-02-05 00:00:00.0 BRIGHT HORIZONS FAMILY SOLUTIONS INC BFAM 10.09% view
B 1999-01-08 00:00:00.0 ADVANCE PARADIGM INC ADVP 8.61% view
B -76.27% 1999-01-08 00:00:00.0 ADVANTAGE LEARNING SYSTEMS INC RLRN 5.91% view
S 1999-01-08 00:00:00.0 MICROMUSE INC MUSE 10.08% view
B -33.50% 1999-01-08 00:00:00.0 DIGITAL RIVER INC DRIV 7.73% view
S 1999-01-08 00:00:00.0 BRIGHT HORIZONS FAMILY SOLUTIONS INC BFAM 10.89% view
B 1998-12-11 00:00:00.0 MICROMUSE INC MUSE 10.21% view
B -30.69% 1998-12-11 00:00:00.0 BRIGHT HORIZONS FAMILY SOLUTIONS INC BFAM 11.28% view
S 1998-11-09 00:00:00.0 BRIGHT HORIZONS FAMILY SOLUTIONS INC BFAM 11.26% view
B -29.98% 1998-10-08 00:00:00.0 BRIGHT HORIZONS FAMILY SOLUTIONS INC BFAM 12.87% view
B -24.44% 1998-09-10 00:00:00.0 BRIGHT HORIZONS FAMILY SOLUTIONS INC BFAM 12.8% view
S 1998-08-10 00:00:00.0 RIT TECHNOLOGIES LTD RITT 11.23% view
S 1998-08-10 00:00:00.0 EVOLVING SYSTEMS INC EVOL 3.73% view
B -27.35% 1998-08-10 00:00:00.0 BRIGHT HORIZONS FAMILY SOLUTIONS INC BFAM 12.62% view
S 1998-07-08 00:00:00.0 RIT TECHNOLOGIES LTD RITT 11.72% view
B -55.02% 1998-07-08 00:00:00.0 EVOLVING SYSTEMS INC EVOL 10.58% view
B -81.87% 1998-06-09 00:00:00.0 RIT TECHNOLOGIES LTD RITT 12.27% view
B -88.51% 1998-05-07 00:00:00.0 RIT TECHNOLOGIES LTD RITT 12.23% view
B -82.34% 1998-01-29 00:00:00.0 RIT TECHNOLOGIES LTD RITT 7.98% view
B 1998-01-29 00:00:00.0 BIOTIME INC BTIM 5.11% view
B -62.87% 1998-01-29 00:00:00.0 RADIANT SYSTEMS INC RADS 5.93% view
B 100.00% 1998-01-29 00:00:00.0 OSTEOTECH INC OSTE 7.61% view
B -55.65% 1998-01-29 00:00:00.0 OMTOOL LTD OMTL 5.87% view
S 1998-01-29 00:00:00.0 I STAT CORPORATION STAT 8.38% view
B -83.03% 1998-01-29 00:00:00.0 NATURAL MICROSYSTEMS CORP NMSS 6.83% view
S 1998-01-29 00:00:00.0 METZLER GROUP INC NCI 6.77% view
S 1998-01-29 00:00:00.0 COMPUTER TASK GROUP INC CTG 7.63% view
S 1997-09-10 00:00:00.0 METZLER GROUP INC NCI 10.18% view
B 1997-08-13 00:00:00.0 I STAT CORPORATION STAT 10.4% view
S 1997-08-13 00:00:00.0 METZLER GROUP INC NCI 10.2% view
B 4.49% 1997-07-10 00:00:00.0 METZLER GROUP INC NCI 10.25% view
B 1997-03-19 00:00:00.0 ALPHA 1 BIOMEDICALS INC RGRX 5.92% view
S 1997-03-10 00:00:00.0 HARMONIC LIGHTWAVES INC HLIT 4.94% view
B -66.48% 1997-01-10 00:00:00.0 CYMER INC CYMI 6.16% view
B 10.49% 1997-01-10 00:00:00.0 COMPUTER HORIZONS CORP CHRZ 7.78% view
S 1997-01-10 00:00:00.0 HARMONIC LIGHTWAVES INC HLIT 12.19% view
B 1997-01-10 00:00:00.0 PUMA TECHNOLOGY INC PUMA 7.94% view
B 1997-01-10 00:00:00.0 VERITY INC VRTY 7.94% view
B -56.10% 1997-01-10 00:00:00.0 DIGITAL MICROWAVE CORP STXN 5.84% view
B -2.82% 1997-01-10 00:00:00.0 MAGAININ PHARMACEUTICALS INC GENR 4.08% view
B 48.20% 1997-01-10 00:00:00.0 CITRIX SYSTEMS INC CTXS 57.0% view
B 1997-01-10 00:00:00.0 PREMIERE TECHNOLOGIES INC PTEK 3.21% view
B 1997-01-10 00:00:00.0 SEROLOGICALS CORP SERO 5.53% view
B 1997-01-10 00:00:00.0 COMPUTER TASK GROUP INC CTG 8.94% view
B -35.02% 1996-12-11 00:00:00.0 HARMONIC LIGHTWAVES INC HLIT 13.31% view
B 1996-12-11 00:00:00.0 AMX CORP AMXC n/a view
* Institutions do not report transaction buy/sell types directly. To help members better understand the transactions, this column is filled by InsiderCow's best-effort interpretations.
** Since most institutions are long investors, only returns for long transactions are shown here.