Ticker · CUSIP 046433108
Holders (tracked)
14
Combined shares
2,477,670
Combined value
$134.39M
Last close
$76.97
Quarter
2025Q4
Price · 1Y$76.97+55.21 (+253.72%)H $81.35 · L $20.03 · Avg Vol 669K
Tracked holders · last 8 quarters
+3 vs previous quarter over the last 8.
Price is +41.9% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
23 events
- T. Rowe Price added2026-02-17+1,422 shares · 2025Q4Position
- D.E. Shaw & Co. trimmed2026-02-17−388,637 shares · 2025Q4Position
- +96,386 shares · 2025Q4Position
- Two Sigma Investments trimmed2026-02-17−27,699 shares · 2025Q4Position
- AQR Capital Management added2026-02-17+2,998 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) added2026-02-17+14,092 shares · 2025Q4Position
- Steve Cohen (Point72) opened position2026-02-17+497,260 shares · 2025Q4Position
- Ken Griffin (Citadel Advisors) added2026-02-17+165,312 shares · 2025Q4Position
- Renaissance Technologies trimmed2026-02-12−111,580 shares · 2025Q4Position
- Ken Fisher (Fisher Asset Mgmt) trimmed2026-02-09−4,638 shares · 2025Q4Position
- Mario Gabelli (GAMCO) added2026-02-05+6,800 shares · 2025Q4Position
- −6,000 shares · 2025Q4Position
- −213,209 shares · 2025Q3Position
- Two Sigma Investments trimmed2025-11-14−59,742 shares · 2025Q3Position
- D.E. Shaw & Co. added2025-11-14+33,462 shares · 2025Q3Position
- T. Rowe Price added2025-11-14+1,415 shares · 2025Q3Position
- AQR Capital Management added2025-11-14+17,213 shares · 2025Q3Position
- Izzy Englander (Millennium Mgmt) trimmed2025-11-14−337,733 shares · 2025Q3Position
- Steve Cohen (Point72) exited2025-11-14−34,224 shares · 2025Q3Position
- Renaissance Technologies trimmed2025-11-13−180,300 shares · 2025Q3Position
- First Eagle Investment Management added2025-11-12+14,000 shares · 2025Q3Position
- Mario Gabelli (GAMCO) trimmed2025-11-12−300 shares · 2025Q3Position
- Ken Fisher (Fisher Asset Mgmt) trimmed2025-11-12−21,022 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of ATRO…
Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.
| Investor | First in | Cost basis | Return | Position value today |
|---|---|---|---|---|
| Ken Fisher (Fisher Asset Mgmt) | 2019Q3 | $13.03 | +490.8% | $4.7M |
| First Eagle Investment Management | 2021Q2 | $15.83 | +386.3% | $17.7M |
| Renaissance Technologies | 2016Q1 | $18.89 | +307.6% | $4.1M |
| Two Sigma Investments | 2016Q3 | $18.97 | +305.6% | $2.6M |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $20.92 | +267.9% | $27.8M |
| T. Rowe Price | 2024Q4 | $24.07 | +219.7% | $1.4M |
| Paul Tudor Jones (Tudor Investment) | 2016Q1 | $25.36 | +203.5% | $7.4M |
| D.E. Shaw & Co. | 2017Q1 | $25.78 | +198.6% | $38.0M |
| AQR Capital Management | 2016Q1 | $29.10 | +164.5% | $19.9M |
| Mario Gabelli (GAMCO) | 2016Q1 | $33.31 | +131.1% | $2.1M |
| Steve Cohen (Point72) | 2021Q4 | $52.22 | +47.4% | $38.3M |
| Ken Griffin (Citadel Advisors) | 2016Q3 | $53.97 | +42.6% | $1.9M |
| Ken Griffin (Citadel Advisors) | 2016Q3 | $53.97 | +42.6% | $1.9M |
| Ken Griffin (Citadel Advisors) | 2016Q3 | $53.97 | +42.6% | $1.9M |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions2
- Steve Cohen (Point72)+497,260$27.0M
- Paul Tudor Jones (Tudor Investment)+96,386$5.2M
Added to5
- Ken Griffin (Citadel Advisors)+165,312$9.0M
- Izzy Englander (Millennium Mgmt)+14,092$764K
- Mario Gabelli (GAMCO)+6,800$369K
- AQR Capital Management+2,998$163K
- T. Rowe Price+1,422$77
Trimmed5
- D.E. Shaw & Co.−388,637$21.1M
- Renaissance Technologies−111,580$6.1M
- Two Sigma Investments−27,699$1.5M
- First Eagle Investment Management−6,000$325K
- Ken Fisher (Fisher Asset Mgmt)−4,638$252K
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 9 | $39.6M |
| 2022Q2 | 9 | $28.1M |
| 2022Q3 | 8 | $20.9M |
| 2022Q4 | 10 | $27.2M |
| 2023Q1 | 14 | $41.2M |
| 2023Q2 | 10 | $53.0M |
| 2023Q3 | 14 | $45.5M |
| 2023Q4 | 12 | $55.0M |
| 2024Q1 | 13 | $57.3M |
| 2024Q2 | 14 | $64.8M |
| 2024Q3 | 14 | $24.5M |
| 2024Q4 | 13 | $34.0M |
| 2025Q1 | 14 | $72.5M |
| 2025Q2 | 13 | $110.4M |
| 2025Q3 | 11 | $101.3M |
| 2025Q4 | 14 | $134.4M |
Who owns ATRO
14 super-investors · 2025Q4
Tracked stake
2.48M
shares
Combined value
$134M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New2Added7Trim5
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Steve Cohen Point72 | 497.3K | $27M |
| 2 | D.E. Shaw & Co. | 493.4K | $27M |
| 3 | Izzy Englander Millennium Mgmt | 360.6K | $20M |
| 4 | Ken Griffin Citadel Advisors | 315.8K | $17M |
| 5 | AQR Capital Management | 258.2K | $14M |
| 6 | First Eagle Investment Management | 230.3K | $12M |
| 7 | Paul Tudor Jones Tudor Investment | 96.4K | $5M |
| 8 | Ken Fisher Fisher Asset Mgmt | 60.6K | $3M |
| 9 | Renaissance Technologies | 53.0K | $3M |
| 10 | Two Sigma Investments | 33.3K | $2M |
| 11 | Mario Gabelli GAMCO | 27.3K | $1M |
| 12 | Ken Griffin Citadel Advisors | 24.7K | $1M |
| 13 | T. Rowe Price | 17.9K | $971K |
| 14 | Ken Griffin Citadel Advisors | 8.8K | $477K |
Recent moves
20 transactions
- TRIMD.E. Shaw & Co.−388,637 · 2025Q4
- +96,386 · 2025Q4
- +165,312 · 2025Q4
- +1,422 · 2025Q4
- +14,092 · 2025Q4
- +497,260 · 2025Q4
- −27,699 · 2025Q4
- +2,998 · 2025Q4
- −111,580 · 2025Q4
- −4,638 · 2025Q4
- +6,800 · 2025Q4
- −6,000 · 2025Q4
- −213,209 · 2025Q3
- −34,224 · 2025Q3
- +1,415 · 2025Q3
- −59,742 · 2025Q3
- +33,462 · 2025Q3
- −337,733 · 2025Q3
- +17,213 · 2025Q3
- −180,300 · 2025Q3
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