| Couchman Jonathan +2 co-filers10% owner · 54 transactions | — | 15.98M†as of Feb 2019 | — | 2.00M | — |
| Icahn Carl C +2 co-filers10% owner · 3 transactions | — | 13.43M | 13.07M | — | — |
| Couchman Jonathan +6 co-filers10% owner, See explanation of responses · 3 transactions | — | 9.44M†as of Aug 2020 | — | 506.3K | 77.1K |
| Couchman Jonathan +3 co-filers10% owner · 6 transactions | — | 7.74M†as of Aug 2021 | — | 652.7K | 107.5K |
| Buchalter Jeffrey HCEO & President, Director · 19 transactions | — | 529.3Kas of Jan 2010 | 469.4K | 65.0K | — |
| Levy Harold JDirector · 1 transaction | — | 216.5K†as of Feb 2010 | — | — | — |
| del Campo RalphCOO and Princ. Exec. Officer · 30 transactions | — | 204.6Kas of Sep 2011 | 209.7K | — | — |
| Read Randolph CDirector · 4 transactions | — | 200.0Kas of Jun 2023 | — | 200.0K | — |
| Tooman Craig AExec VP Finance, CFO · 31 transactions | — | 160.5Kas of Jun 2010 | 439.2K | 2.0K | 289.3K |
| Horak Ivan DEVP, R&D, CSO · 50 transactions | — | 138.5Kas of Apr 2011 | 549.4K | 3.0K | 367.3K |
| Dubin Glenn +4 co-filers10% owner · 16 transactions | — | 132.7K†as of Aug 2007 | — | 294.0K | — |
| Davit Paul StephenExec. Vice Pres. HR · 27 transactions | — | 109.3Kas of Jul 2011 | 82.5K | — | 2.8K |
| Bleznick JordanDirector · 1 transaction | — | 100.0Kas of Nov 2020 | — | 100.0K | — |
| Dubin Glenn +4 co-filers10% owner · 10 transactions | — | 81.6Kas of Mar 2007 | — | 111.6K | — |
| Buchbinder AbyVP, Clinical Development · 5 transactions | — | 79.2Kas of Jan 2013 | 15.7K | — | 2.7K |
| Rackear Andrew D.VP and General Counsel · 6 transactions | — | 78.0Kas of Jan 2013 | 24.7K | — | 5.4K |
| Conover CharlesSVP, R&D Program Management · 3 transactions | — | 74.8Kas of Jan 2013 | 12.3K | — | 25.0K |
| Stancic AnaExecutive VP, COO, PEO, CFO · 3 transactions | — | 70.0Kas of Jan 2012 | 70.0K | — | — |
| Dubin Glenn +5 co-filers10% owner · 12 transactions | — | 68.9Kas of Feb 2007 | — | 68.9K | — |
| Salisbury Robert CDirector · 19 transactions | — | 67.7Kas of Jul 2012 | 52.1K | 10.0K | — |
| Denner Alexander JDirector · 4 transactions | — | 60.6Kas of Jul 2012 | 60.6K | — | — |
| Classon Rolf ADirector · 20 transactions | — | 55.3Kas of Jul 2010 | 64.1K | 10.0K | 30.0K |
| Micati Victor PDirector · 12 transactions | — | 50.6Kas of Jul 2010 | 34.1K | 15.0K | — |
| Mulligan RichardDirector · 4 transactions | — | 49.1Kas of Jul 2012 | 49.1K | — | — |
| Hebard GeorgeInterim PEO and Interim COO, Director · 3 transactions | — | 43.2Kas of Nov 2012 | 38.2K | 5.0K | — |
| Lebuhn RobertDirector · 23 transactions | — | 42.2Kas of Sep 2013 | 92.1K | — | 92.4K |
| Ando GoranDirector · 10 transactions | — | 40.4Kas of Jul 2009 | 23.8K | 15.0K | — |
| Icahn Carl C10% owner · 7 transactions | — | 39.3Kas of Oct 2020 | — | 694.0K | — |
| Greenberger Lee MVP, Research · 2 transactions | — | 36.1Kas of Jan 2012 | 3.5K | — | — |
| Deuel ThomasDirector · 4 transactions | — | 32.2Kas of Jul 2012 | 32.2K | — | — |
| Young Richard ADirector · 5 transactions | — | 30.2Kas of Jul 2012 | 32.2K | — | 2.0K |
| Renfro Phillip MDirector · 18 transactions | — | 20.2Kas of Nov 2008 | 34.6K | 10.0K | 20.5K |
| Geltosky JohnDirector · 2 transactions | — | 18.8Kas of Jul 2008 | 18.8K | — | — |
| Daly TimothyVP, Controller and PAO · 1 transaction | — | 8.0Kas of Mar 2012 | 8.0K | — | — |
| Dubin Glenn +3 co-filers10% owner · 18 transactions | — | 7.3Kas of Apr 2007 | — | 65.6K | — |
| Ogden Mark LActing VP of Fin & Prin FO · 1 transaction | — | 4.0Kas of Feb 2011 | — | 2.0K | — |