| 2010-06-02 | Sale | Geron Corporation GERN | President and CEO | 37,748 0.0375% | $5.43 | $204,972 | -10.35% | |
| 2010-05-24 | Sale | Geron Corporation GERN | President and CEO | 9,342 0.0099% | $5.11 | $47,738 | +1.4% | |
| 2009-05-29 | Sale | Geron Corporation GERN | President and CEO | 11,656 0.0128% | $6.35 | $74,016 | -6.06% | |
| 2009-05-26 | Sale | Geron Corporation GERN | President and CEO | 93,338 0.106% | $6.75 | $630,032 | -8.35% | |
| 2009-01-05 | Sale | Geron Corporation GERN | President and CEO | 25,024 0.0291% | $4.90 | $122,618 | +27.8% | |
| 2008-01-04 | Sale | Geron Corporation GERN | President and CEO | 26,332 0.035% | $5.34 | $140,613 | -17.52% | |
| 2006-01-09 | Sale | Geron Corporation GERN | President and CEO | 12,320 0.0189% | $8.56 | $105,459 | -12.02% | |
| 2005-01-13 | Sale | Geron Corporation GERN | President and CEO | 14,283 0.0268% | $8.57 | $122,405 | +2.38% |