| 2024-06-04 | Sale | Geron Corporation GERN | Chairman, President and CEO | 600,000 0.1014% | $4.00 | $2.4M | +16.08% | |
| 2023-02-10 | Sale | Geron Corporation GERN | Chairman, President and CEO | 446,668 0.0818% | $3.00 | $1.34M | -23.26% | |
| 2023-02-09 | Sale | Geron Corporation GERN | Chairman, President and CEO | 446,666 0.0826% | $3.03 | $1.35M | -22.92% | |
| 2023-02-08 | Sale | Geron Corporation GERN | Chairman, President and CEO | 446,666 0.0828% | $3.08 | $1.38M | -23.44% | |
| 2013-04-01 | Geron Corporation GERN | President and CEO | 100,000 0.0731% | $1.03 | $103,000 | +100.91% | ||
| 2012-01-24 | Geron Corporation GERN | President and CEO | 150,000 0.1194% | $1.72 | $258,000 | -4.68% |