| Symbol | Relationship | Date | Transaction | Cost | # Shares | Value($) | Total Shares | Form 4 |
| ATRA | SVP, GC & Secretary | Aug 16, 2022 | Sale | $5.03 | 3,430 | 17,269 | 133,432 | Aug 18, 2022, 06:21 PM |
| ATRA | SVP, GC & Secretary | May 17, 2022 | Sale | $5.32 | 3,223 | 17,134 | 134,641 | May 19, 2022, 05:20 PM |
| ATRA | SVP, GC & Secretary | Mar 01, 2022 | Sale | $9.86 | 2,577 | 25,400 | 138,070 | Mar 03, 2022, 07:02 PM |
| ATRA | SVP, GC & Secretary | Nov 16, 2021 | Sale | $17.12 | 2,124 | 36,356 | 87,540 | Nov 18, 2021, 05:53 PM |
| ATRA | SVP, GC & Secretary | Aug 17, 2021 | Sale | $12.53 | 2,080 | 26,067 | 89,664 | Aug 19, 2021, 07:35 PM |
| ATRA | SVP, GC & Secretary | May 18, 2021 | Sale | $14.55 | 5,681 | 82,659 | 91,744 | May 20, 2021, 04:32 PM |
| Symbol | Relationship | Date | Transaction | Value($) |
| ATRA | SVP, GC & Secretary | Aug 16, 2022 | Sale | 17,269 |
| ATRA | SVP, GC & Secretary | May 17, 2022 | Sale | 17,134 |
| ATRA | SVP, GC & Secretary | Mar 01, 2022 | Sale | 25,400 |
| ATRA | SVP, GC & Secretary | Nov 16, 2021 | Sale | 36,356 |
| ATRA | SVP, GC & Secretary | Aug 17, 2021 | Sale | 26,067 |
| ATRA | SVP, GC & Secretary | May 18, 2021 | Sale | 82,659 |