| Symbol | Relationship | Date | Transaction | Cost | # Shares | Value($) | Total Shares | Form 4 |
| ATRC | Director | Feb 23, 2011 | Option Exercise | $0.57 | 11,315 | 6,450 | 210,056 | Feb 25, 2011, 12:12 PM |
| ATRC | Director | Feb 23, 2011 | Sale | $10.34 | 11,315 | 116,948 | 198,741 | Feb 25, 2011, 12:12 PM |
| Symbol | Relationship | Date | Transaction | Value($) |
| ATRC | Director | Feb 23, 2011 | Option Exercise | 6,450 |
| ATRC | Director | Feb 23, 2011 | Sale | 116,948 |