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GENZ - As of  04/30/25, 11:53:39 AM:   102 Insider Transactions.

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Buy/Sell* Filed Date Subject Symbol Acquirer Pct Owned Details
B 2011-04-13 17:00:23.0 GENZYME CORP GENZ SANOFI 90.0% view
S 2011-03-09 16:35:54.0 GENZYME CORP GENZ BlackRock Inc 4.77% view
B 2011-02-11 16:41:12.0 GENZYME CORP GENZ ICAHN CARL C 5.06% view
B 2011-02-10 16:51:37.0 GENZYME CORP GENZ GOLDMAN SACHS GROUP INC 6.8% view
B 2011-02-04 14:41:53.0 GENZYME CORP GENZ BlackRock Inc 5.66% view
S 2009-02-10 17:23:03.0 GENZYME CORP GENZ UBS GLOBAL ASSET MANAGEMENT AMERICAS INC 3.7% view
B 2008-02-14 09:16:24.0 GENZYME CORP GENZ Clearbridge Advisors 8.23% view
S 2008-02-13 11:34:59.0 GENZYME CORP GENZ MARSICO CAPITAL MANAGEMENT LLC 0.0% view
S 2008-02-13 10:43:02.0 GENZYME CORP GENZ SANDS CAPITAL MANAGEMENT 4.7% view
B 2008-02-11 08:49:56.0 GENZYME CORP GENZ UBS GLOBAL ASSET MANAGEMENT AMERICAS INC 6.6% view
B 2007-02-21 14:45:58.0 GENZYME CORP GENZ UBS GLOBAL ASSET MANAGEMENT AMERICAS INC 6.3% view
B 2007-02-14 11:25:19.0 GENZYME CORP GENZ SANDS CAPITAL MANAGEMENT 5.4% view
S 2007-02-14 11:11:32.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 3.22% view
B 2007-02-13 12:06:58.0 GENZYME CORP GENZ MARSICO CAPITAL MANAGEMENT LLC 7.0% view
B 2007-02-08 11:33:38.0 GENZYME CORP GENZ Clearbridge Advisors 7.66% view
B 2006-02-14 00:00:00.0 GENZYME CORP GENZ CAM North America 4.45% view
S 2006-02-14 00:00:00.0 GENZYME CORP GENZ MASSACHUSETTS FINANCIAL SERVICES CO 2.4% view
S 2006-01-10 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 7.01% view
S 2006-01-05 00:00:00.0 GENZYME CORP GENZ CITIGROUP INC 1.2% view
B 2005-02-14 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 12.103% view
S 2005-02-14 00:00:00.0 GENZYME CORP GENZ FMR CORP n/a view
B 2005-02-10 00:00:00.0 GENZYME CORP GENZ MASSACHUSETTS FINANCIAL SERVICES CO 6.22% view
B 2005-02-09 00:00:00.0 GENZYME CORP GENZ CITIGROUP INC 10.1% view
S 2004-02-17 00:00:00.0 GENZYME CORP GENZ FMR CORP n/a view
S 2004-02-12 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 10.583% view
S 2004-02-11 00:00:00.0 GENZYME CORP GENZ CITIGROUP INC 9.8% view
S 2003-07-11 00:00:00.0 GENZYME CORP GENZ KNOTT DAVID M 0.0% view
B 2003-06-30 00:00:00.0 GENZYME CORP GENZ KNOTT DAVID M 7.7% view
B 2003-06-04 00:00:00.0 GENZYME CORP GENZ GARDNER LEWIS ASSET MANAGEMENT L P 11.23% view
B 2003-02-13 00:00:00.0 GENZYME CORP GENZ GARDNER LEWIS ASSET MANAGEMENT L P 6.06% view
B 2003-02-12 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 14.0% view
B 2003-02-12 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 13.23% view
S 2003-02-11 00:00:00.0 GENZYME CORP GENZ MASSACHUSETTS FINANCIAL SERVICES CO 4.19% view
B 2003-02-04 00:00:00.0 GENZYME CORP GENZ CITIGROUP INC 10.9% view
S 2003-01-17 00:00:00.0 GENZYME CORP GENZ CITIGROUP INC 4.3% view
S 2002-10-09 00:00:00.0 GENZYME CORP GENZ MASSACHUSETTS FINANCIAL SERVICES CO 5.4% view
B 2002-07-10 00:00:00.0 GENZYME CORP GENZ CITIGROUP INC 11.4% view
B 2002-05-13 00:00:00.0 GENZYME CORP GENZ MASSACHUSETTS FINANCIAL SERVICES CO 10.5% view
B 2002-05-09 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 11.88% view
S 2002-04-08 00:00:00.0 GENZYME CORP GENZ HEALTHCARE VENTURES II LP 3.2% view
B 2002-03-08 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 11.46% view
S 2002-02-14 00:00:00.0 GENZYME CORP GENZ BALAZS ENDRE A 7.08% view
S 2002-02-14 00:00:00.0 GENZYME CORP GENZ DENLINGER JANET L 4.26% view
S 2002-02-12 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 3.86% view
B 2002-02-12 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 13.38% view
B 2002-02-12 00:00:00.0 GENZYME CORP GENZ MASSACHUSETTS FINANCIAL SERVICES CO 5.9% view
S 2002-02-04 00:00:00.0 GENZYME CORP GENZ CITIGROUP INC 5.2% view
B 2002-02-01 00:00:00.0 GENZYME CORP GENZ CITIGROUP INC 8.5% view
B 2001-03-27 00:00:00.0 GENZYME CORP GENZ BALAZS ENDRE A 7.12% view
B 2001-03-27 00:00:00.0 GENZYME CORP GENZ DENLINGER JANET L 4.92% view
B 2001-02-20 00:00:00.0 GENZYME CORP GENZ CITIGROUP INC 6.3% view
B 2001-02-20 00:00:00.0 GENZYME CORP GENZ CITIGROUP INC 7.4% view
S 2001-02-13 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 8.46% view
S 2001-02-13 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 8.04% view
S 2001-02-13 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 4.06% view
S 2001-02-12 00:00:00.0 GENZYME CORP GENZ BAUPOST GROUP LLC 0.0% view
S 2001-02-07 00:00:00.0 GENZYME CORP GENZ IRIDIAN ASSET MANAGEMENT LLC 5.0% view
S 2001-01-10 00:00:00.0 GENZYME CORP GENZ STATE OF WISCONSIN INVESTMENT BOARD 1.0% view
B 2000-11-15 00:00:00.0 GENZYME CORP GENZ GENZYME TRANSGENICS CORP 28.5% view
S 2000-10-10 00:00:00.0 GENZYME CORP GENZ CITIGROUP INC 5.0% view
B 2000-06-12 00:00:00.0 GENZYME CORP GENZ CITIGROUP INC 14.0% view
S 2000-05-10 00:00:00.0 GENZYME CORP GENZ FMR CORP n/a view
B 2000-02-14 00:00:00.0 GENZYME CORP GENZ CITIGROUP INC 8.0% view
S 2000-02-11 00:00:00.0 GENZYME CORP GENZ FMR CORP n/a view
S 2000-02-11 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 13.89% view
S 2000-02-11 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 7.15% view
S 2000-02-11 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 14.0% view
B 2000-02-11 00:00:00.0 GENZYME CORP GENZ BAUPOST GROUP LLC 9.83% view
B 2000-02-07 00:00:00.0 GENZYME CORP GENZ IRIDIAN ASSET MANAGEMENT LLC 5.5% view
B 2000-02-04 00:00:00.0 GENZYME CORP GENZ STATE OF WISCONSIN INVESTMENT BOARD 13.01% view
S 2000-01-10 00:00:00.0 GENZYME CORP GENZ AMERINDO INVESTMENT ADVISORS INC 0.11% view
S 1999-11-10 00:00:00.0 GENZYME CORP GENZ MORGAN J P & CO INC 2.29% view
B 1999-07-09 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 14.0% view
B 1999-03-10 00:00:00.0 GENZYME CORP GENZ FMR CORP n/a view
B 1999-02-22 00:00:00.0 GENZYME CORP GENZ MORGAN J P & CO INC 7.5% view
B 1999-02-16 00:00:00.0 GENZYME CORP GENZ HEALTHCARE VENTURES II LP 5.2% view
S 1999-02-12 00:00:00.0 GENZYME CORP GENZ AMERINDO INVESTMENT ADVISORS INC 5.31% view
S 1999-02-12 00:00:00.0 GENZYME CORP GENZ EQUITABLE COMPANIES INC 1.9% view
S 1999-02-09 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 7.46% view
S 1999-02-09 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 12.53% view
B 1999-01-08 00:00:00.0 GENZYME CORP GENZ STATE OF WISCONSIN INVESTMENT BOARD 10.5% view
S 1998-11-09 00:00:00.0 GENZYME CORP GENZ AMERINDO INVESTMENT ADVISORS INC 6.83% view
B 1998-03-10 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 12.68% view
B 1998-02-13 00:00:00.0 GENZYME CORP GENZ AMERINDO INVESTMENT ADVISORS INC 12.81% view
B 1998-02-13 00:00:00.0 GENZYME CORP GENZ EQUITABLE COMPANIES INC 5.9% view
B 1998-02-09 00:00:00.0 GENZYME CORP GENZ WELLINGTON MANAGEMENT CO LLP 9.9% view
S 1998-01-28 00:00:00.0 GENZYME CORP GENZ STATE OF WISCONSIN INVESTMENT BOARD 9.24% view
B 1997-12-08 00:00:00.0 GENZYME CORP GENZ AMERINDO INVESTMENT ADVISORS INC 11.08% view
B 1997-02-11 00:00:00.0 GENZYME CORP GENZ AMERICAN CENTURY COMPANIES INC 12.0% view
B 1997-02-11 00:00:00.0 GENZYME CORP GENZ AMERICAN CENTURY COMPANIES INC 12.0% view
B 1997-01-24 00:00:00.0 GENZYME CORP GENZ STATE OF WISCONSIN INVESTMENT BOARD 9.4% view
S 1997-01-14 00:00:00.0 GENZYME CORP GENZ SWISS BANK CORP 3.14% view
B 1996-12-23 00:00:00.0 GENZYME CORP GENZ SWISS BANK CORP 6.31% view
B 1996-12-18 00:00:00.0 GENZYME CORP GENZ SWISS BANK CORP 6.17% view
B 1996-09-03 00:00:00.0 GENZYME CORP GENZ SWISS BANK CORP 5.02% view
B 1996-02-15 00:00:00.0 GENZYME CORP GENZ BRINSON PARTNERS INC 5.4% view
B 1996-02-12 00:00:00.0 GENZYME CORP GENZ TWENTIETH CENTURY COMPANIES INC 7.0% view
B 1996-02-12 00:00:00.0 GENZYME CORP GENZ TWENTIETH CENTURY COMPANIES INC 6.7% view
S 1996-02-02 00:00:00.0 GENZYME CORP GENZ STATE OF WISCONSIN INVESTMENT BOARD 1.11% view
S 1996-02-02 00:00:00.0 GENZYME CORP GENZ STATE OF WISCONSIN INVESTMENT BOARD 5.51% view
B 1995-03-03 00:00:00.0 GENZYME CORP GENZ STATE OF WISCONSIN INVESTMENT BOARD 6.17% view
B 1995-02-14 00:00:00.0 GENZYME CORP GENZ HARRIS BRETALL SULLIVAN & SMITH INC 4.17% 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.