The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
| Date | Insider | Role | Action | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Apr 8, 2011 | GC Merger Corp. | 10% Owner | Buy(P) | 4.4M | — | — |
| Apr 8, 2011 | GC Merger Corp. | 10% Owner | Buy(P) | 16.2M | $76.33 | $1.2B |
| Apr 7, 2011 | GC Merger Corp. | 10% Owner | Buy(P) | 44.9M | — | — |
| Apr 6, 2011 | GC Merger Corp. | 10% Owner | Buy(P) | 3.9M | — | — |
| Apr 4, 2011 | Boudreaux Gail | Director | Disposed to issuer(D) | 15K | $43.90 | $659K |
| Apr 4, 2011 | Boudreaux Gail | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Boudreaux Gail | Director | Disposed to issuer(D) | 7K | $51.52 | $367K |
| Apr 4, 2011 | Fenton Dennis M | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Fenton Dennis M | Director | Tender(U) | 355 | $74.00 | $26K |
| Apr 4, 2011 | Fenton Dennis M | Director | Disposed to issuer(D) | 2K | $74.00 | $176K |
| Apr 4, 2011 | Fenton Dennis M | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Fenton Dennis M | Director | Disposed to issuer(D) | 7K | $51.52 | $367K |
| Apr 4, 2011 | Syron Richard F | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Syron Richard F | Director | Tender(U) | 5K | $74.00 | $371K |
| Apr 4, 2011 | Syron Richard F | Director | Disposed to issuer(D) | 2K | $74.00 | $176K |
| Apr 4, 2011 | Syron Richard F | Director | Disposed to issuer(D) | 15K | $58.50 | $878K |
| Apr 4, 2011 | Syron Richard F | Director | Disposed to issuer(D) | 15K | $69.34 | $1.0M |
| Apr 4, 2011 | Syron Richard F | Director | Disposed to issuer(D) | 15K | $62.16 | $932K |
| Apr 4, 2011 | Syron Richard F | Director | Disposed to issuer(D) | 8K | $68.48 | $514K |
| Apr 4, 2011 | Syron Richard F | Director | Disposed to issuer(D) | 8K | $58.66 | $440K |
| Apr 4, 2011 | Syron Richard F | Director | Disposed to issuer(D) | 7K | $51.52 | $367K |
| Apr 4, 2011 | Syron Richard F | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Burakoff Steven | Director | Disposed to issuer(D) | 2K | $74.00 | $176K |
| Apr 4, 2011 | Burakoff Steven | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Burakoff Steven | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Burakoff Steven | Director | Disposed to issuer(D) | 7K | $51.52 | $367K |
| Apr 4, 2011 | Carpenter Robert J | Director | Tender(U) | 32K | $74.00 | $2.4M |
| Apr 4, 2011 | Carpenter Robert J | Director | Disposed to issuer(D) | 2K | $74.00 | $176K |
| Apr 4, 2011 | Carpenter Robert J | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Carpenter Robert J | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Carpenter Robert J | Director | Disposed to issuer(D) | 18K | $32.52 | $585K |
| Apr 4, 2011 | Carpenter Robert J | Director | Disposed to issuer(D) | 15K | $58.50 | $878K |
| Apr 4, 2011 | Carpenter Robert J | Director | Disposed to issuer(D) | 15K | $62.16 | $932K |
| Apr 4, 2011 | Carpenter Robert J | Director | Disposed to issuer(D) | 8K | $68.48 | $514K |
| Apr 4, 2011 | Carpenter Robert J | Director | Disposed to issuer(D) | 7K | $51.52 | $367K |
| Apr 4, 2011 | Carpenter Robert J | Director | Disposed to issuer(D) | 8K | $58.66 | $440K |
| Apr 4, 2011 | Carpenter Robert J | Director | Disposed to issuer(D) | 15K | $62.98 | $945K |
| Apr 4, 2011 | Carpenter Robert J | Director | Disposed to issuer(D) | 2K | $53.47 | $107K |
| Apr 4, 2011 | Carpenter Robert J | Director | Disposed to issuer(D) | 1K | $41.51 | $42K |
| Apr 4, 2011 | Carpenter Robert J | Director | Disposed to issuer(D) | 9K | $43.90 | $395K |
| Apr 4, 2011 | Ende Eric J | Director | Disposed to issuer(D) | 2K | $74.00 | $176K |
| Apr 4, 2011 | Ende Eric J | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Ende Eric J | Director | Disposed to issuer(D) | 7K | $51.52 | $367K |
| Apr 4, 2011 | Ende Eric J | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Whitworth Ralph V | Director | Disposed to issuer(D) | 2K | $74.00 | $176K |
| Apr 4, 2011 | Whitworth Ralph V | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Whitworth Ralph V | Director | Tender(U) | 10.6M | $74.00 | $784.9M |
| Apr 4, 2011 | Whitworth Ralph V | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Whitworth Ralph V | Director | Disposed to issuer(D) | 7K | $51.52 | $367K |
| Apr 4, 2011 | Whitworth Ralph V | Director | Disposed to issuer(D) | 7K | $52.66 | $375K |
| Apr 4, 2011 | Cooney Charles L | Director | Tender(U) | 2K | $74.00 | $139K |
| Apr 4, 2011 | Cooney Charles L | Director | Tender(U) | 240 | $74.00 | $18K |
| Apr 4, 2011 | Cooney Charles L | Director | Tender(U) | 600 | $74.00 | $44K |
| Apr 4, 2011 | Cooney Charles L | Director | Tender(U) | 8K | $74.00 | $621K |
| Apr 4, 2011 | Cooney Charles L | Director | Disposed to issuer(D) | 4K | $76.01 | $302K |
| Apr 4, 2011 | Cooney Charles L | Director | Disposed to issuer(D) | 2K | $74.00 | $176K |
| Apr 4, 2011 | Cooney Charles L | Director | Option exercise(M) | 150 | — | $0 |
| Apr 4, 2011 | Cooney Charles L | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Cooney Charles L | Director | Option exercise(M) | 4K | — | $0 |
| Apr 4, 2011 | Cooney Charles L | Director | Option exercise(M) | 4K | — | $0 |
| Apr 4, 2011 | Cooney Charles L | Director | Option exercise(M) | 150 | — | $0 |
| Apr 4, 2011 | Cooney Charles L | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Cooney Charles L | Director | Disposed to issuer(D) | 7K | $51.52 | $367K |
| Apr 4, 2011 | Cooney Charles L | Director | Disposed to issuer(D) | 8K | $58.66 | $440K |
| Apr 4, 2011 | Cooney Charles L | Director | Disposed to issuer(D) | 2K | $53.47 | $107K |
| Apr 4, 2011 | Cooney Charles L | Director | Disposed to issuer(D) | 15K | $62.16 | $932K |
| Apr 4, 2011 | Cooney Charles L | Director | Disposed to issuer(D) | 15K | $58.50 | $878K |
| Apr 4, 2011 | Cooney Charles L | Director | Disposed to issuer(D) | 15K | $62.98 | $945K |
| Apr 4, 2011 | Cooney Charles L | Director | Disposed to issuer(D) | 1K | $41.51 | $42K |
| Apr 4, 2011 | Cooney Charles L | Director | Disposed to issuer(D) | 8K | $68.48 | $514K |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 281 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 287 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 255 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 208 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 198 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Disposed to issuer(D) | 2K | $74.00 | $176K |
| Apr 4, 2011 | Dzau Victor J | Director | Disposed to issuer(D) | 4K | $76.01 | $300K |
| Apr 4, 2011 | Dzau Victor J | Director | Tender(U) | 5K | $74.00 | $370K |
| Apr 4, 2011 | Dzau Victor J | Director | Tender(U) | 3K | $74.00 | $189K |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 2K | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 504 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 499 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 455 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 368 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 323 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 302 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 263 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Disposed to issuer(D) | 890 | $45.91 | $41K |
| Apr 4, 2011 | Dzau Victor J | Director | Disposed to issuer(D) | 1K | $45.96 | $46K |
| Apr 4, 2011 | Dzau Victor J | Director | Disposed to issuer(D) | 3K | $53.47 | $160K |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 208 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 281 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 499 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 255 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 263 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 504 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 198 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 287 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 368 | — | $0 |
| Apr 4, 2011 | Dzau Victor J | Director | Option exercise(M) | 302 | — | $0 |
Insider transactions sourced from SEC EDGAR Form 4 filings, normalized within minutes of acceptance. "Buy"/"Sell" mark open-market transactions (codes P/S), the tradeable signal. Awards, option exercises and tax-withholding are shown with their raw code. All data is public domain.
Issuer: Genzyme Corp, SEC CIK 0000732485. The symbol on a Form 4 is typed by the filer, so this page follows the issuer with the newest filing under GENZ and shows every filing by that issuer.
Coverage: Form 4 filings indexed 2006-01-02 → 2026-09-12. Earlier history is backfilling; this window widens as it deepens.
Programmatic access via the Arkolith API & MCP server (insider.transactions, insider.company).
Connected pages for GENZ