- Quarter end
- 31 Mar 2026
- the date the book describes
- Filed
- 18 May 2026
- latest of these filings; the earliest 12 May 2026
- Managers listing it
- 30
- at least, of 95 tracked, among listed positions
- Comparable managers
- 91
- filed both Q4 2025 and Q1 2026; 5 listed it in both
- Shares listed
- 4,510,438
- combined, among listed positions
- Reported value
- $301m
- combined, at the quarter end
AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.
Among the 91 comparable managers: 15 buyers (opened or added shares) and 16 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +617,596.
Managers listing ATRO in Q1 2026
30 of 30 holders
Largest increases and reductions, by shares
Increases
- Capital World Investorsnew position · 560,939 shares now+560,939
- Jane Street Group LLCexisting position · 201,091 shares now+190,568
- Two Sigma Investments LPexisting position · 216,727 shares now+183,424
- Renaissance Technologies LLCexisting position · 222,920 shares now+169,900
- D. E. Shaw & Co.existing position · 608,449 shares now+115,025
Reductions
- Citadel Advisors LLCexisting position · 96,424 shares now-219,376
- Millennium Management LLCexisting position · 220,023 shares now-140,571
- Marshall Wace LLPexisting position · 251,213 shares now-134,305
- Voloridge Investment Management LLCexisting position · 102,228 shares now-109,853
- First Eagle Investment Management LLCexisting position · 192,326 shares now-38,000
New positions and exits
New (3)
Exited (3)
- Squarepoint Ops LLCwas $3.5m
- Verition Fund Management LLCwas $2.0m
- Schonfeld Strategic Advisors LLCwas $1.2m
Ownership over time
Tracked managers listing it, at least.
| Quarter | Holders | Reported value | Buyers | Sellers |
|---|---|---|---|---|
| Q4 2014 | 1 | $213k | n.a. | n.a. |
| Q2 2015 | 1 | $51m | n.a. | n.a. |
| Q3 2015 | 1 | $35m | n.a. | n.a. |
| Q4 2015 | 2 | $45m | n.a. | n.a. |
| Q1 2016 | 3 | $55m | n.a. | n.a. |
| Q2 2016 | 1 | $46m | n.a. | n.a. |
| Q3 2016 | 1 | $63m | n.a. | n.a. |
| Q4 2016 | 1 | $55m | n.a. | n.a. |
| Q1 2017 | 1 | $51m | n.a. | n.a. |
| Q2 2017 | 1 | $47m | n.a. | n.a. |
| Q3 2017 | 1 | $45m | n.a. | n.a. |
| Q4 2017 | 1 | $59m | n.a. | n.a. |
| Q1 2018 | 1 | $51m | n.a. | n.a. |
| Q2 2018 | 1 | $48m | n.a. | n.a. |
| Q3 2018 | 1 | $55m | n.a. | n.a. |
| Q4 2018 | 1 | $43m | n.a. | n.a. |
| Q1 2019 | 1 | $45m | n.a. | n.a. |
| Q2 2019 | 4 | $66m | n.a. | n.a. |
| Q3 2019 | 2 | $50m | n.a. | n.a. |
| Q4 2019 | 2 | $37m | n.a. | n.a. |
| Q1 2020 | 1 | $221k | n.a. | n.a. |
| Q2 2020 | 2 | $588k | n.a. | n.a. |
| Q3 2020 | 2 | $756k | n.a. | n.a. |
| Q4 2020 | 2 | $7.8m | n.a. | n.a. |
| Q1 2021 | 1 | $7.3m | n.a. | n.a. |
| Q2 2021 | 3 | $11m | n.a. | n.a. |
| Q3 2021 | 2 | $4.9m | n.a. | n.a. |
| Q4 2021 | 1 | $1.1m | n.a. | n.a. |
| Q1 2022 | 2 | $6.8m | n.a. | n.a. |
| Q2 2022 | 2 | $6.6m | n.a. | n.a. |
| Q3 2022 | 2 | $5.3m | n.a. | n.a. |
| Q4 2022 | 2 | $6.5m | n.a. | n.a. |
| Q1 2023 | 1 | $4.5m | n.a. | n.a. |
| Q2 2023 | 4 | $25m | n.a. | n.a. |
| Q3 2023 | 3 | $20m | n.a. | n.a. |
| Q4 2023 | 3 | $22m | 2 | 1 |
| Q1 2024 | 3 | $23m | 2 | 1 |
| Q2 2024 | 2 | $18m | 1 | 1 |
| Q3 2024 | 2 | $19m | 2 | 0 |
| Q4 2024 | 3 | $21m | 2 | 1 |
| Q1 2025 | 3 | $25m | 1 | 2 |
| Q2 2025 | 6 | $37m | 4 | 2 |
| Q3 2025 | 5 | $42m | 3 | 2 |
| Q4 2025 | 5 | $28m | 17 | 14 |
| Q1 2026 | 8 | $120m | 15 | 16 |
| Q2 2026 | 5 | $74m | 15 | 17 |
Compare with…
Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.
ATRO and RTX →ATRO and BA →ATRO and TDG →Choose a stock to compare with ATRO →
How much of the picture this is
A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.
Which funds own ATRO, latest filings →Back to the 13F Explorer →