Simplex Trading, LLC
- SEC CIK
- 0001488542
- Latest filing
- Aug 12, 2026
ATRA holding history
Atara Biotherapeutics, Inc. in every 13F filed by Simplex Trading, LLC, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.
ATRA overviewAll 13F holders of ATRAFull Q2 2026 holdings
- Shares (Q1 2024)
- 0
- Sold out in Q1 2024
- Value
- $0
- % of portfolio
- 0.0%
- Quarters held
- 12
- Since Q1 2021
| Quarter | Shares | Value | % of portfolio | Share change | Action | All holders |
|---|---|---|---|---|---|---|
| Q1 2024 | 0 | $0 | 0.0% | −6,432−100.0% | Sold out | Holders |
| Q4 2023 | 6,432 | $3.00K | <0.1% | −88,542−93.2% | Reduced | Holders |
| Q3 2023 | 94,974 | $140.0K | <0.1% | +49,710+109.8% | Added | Holders |
| Q2 2023 | 45,264 | $72.0K | <0.1% | +32,113+244.2% | Added | Holders |
| Q1 2023 | 13,151 | $38.0K | <0.1% | +12,092+1,141.8% | Added | Holders |
| Q4 2022 | 1,059 | $3.00K | <0.1% | −292−21.6% | Reduced | Holders |
| Q3 2022 | 1,351 | $5.00K | <0.1% | −5,967−81.5% | Reduced | Holders |
| Q2 2022 | 7,318 | $57.0K | <0.1% | −18,474−71.6% | Reduced | Holders |
| Q1 2022 | 25,792 | $239.0K | <0.1% | +21,702+530.6% | Added | Holders |
| Q4 2021 | 4,090 | $64.0K | <0.1% | +3,315+427.7% | Added | Holders |
| Q3 2021 | 775 | $12.0K | <0.1% | +100+14.8% | Added | Holders |
| Q2 2021 | 675 | $10.0K | <0.1% | +357+112.3% | Added | Holders |
| Q1 2021 | 318 | $4.00K | <0.1% | – | – | Holders |
Livermore's 13F data starts with Q1 2021, so Q1 2021 has no change from the previous quarter.