Ticker · CUSIP 00215F107
Holders (tracked)
6
Combined shares
906,443
Combined value
$20.67M
Last close
$28.23
Quarter
2025Q4
Price · 1Y$28.23+11.52 (+68.90%)H $29.62 · L $13.27 · Avg Vol 54K
Tracked holders · last 8 quarters
Flat over the last 8 quarters.
Price is +23.8% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
11 events
- Ken Griffin (Citadel Advisors) trimmed2026-02-17−53,849 shares · 2025Q4Position
- D.E. Shaw & Co. trimmed2026-02-17−14,303 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−82,740 shares · 2025Q4Position
- T. Rowe Price trimmed2026-02-17−1,300 shares · 2025Q4Position
- Renaissance Technologies trimmed2026-02-12−1,973 shares · 2025Q4Position
- Mario Gabelli (GAMCO) trimmed2026-02-05−25,506 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) added2025-11-14+12,882 shares · 2025Q3Position
- T. Rowe Price added2025-11-14+648 shares · 2025Q3Position
- D.E. Shaw & Co. trimmed2025-11-14−6,223 shares · 2025Q3Position
- Renaissance Technologies trimmed2025-11-13−17,800 shares · 2025Q3Position
- Mario Gabelli (GAMCO) added2025-11-12+6,715 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of ATNI…
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 |
|---|---|---|---|---|
| Mario Gabelli (GAMCO) | 2024Q2 | $17.53 | +61.0% | $1.5M |
| D.E. Shaw & Co. | 2016Q2 | $22.83 | +23.6% | $11.6M |
| Ken Griffin (Citadel Advisors) | 2016Q3 | $24.98 | +13.0% | $465K |
| Izzy Englander (Millennium Mgmt) | 2016Q2 | $25.15 | +12.3% | $2.0M |
| T. Rowe Price | 2016Q2 | $45.85 | -38.4% | $329K |
| Renaissance Technologies | 2016Q2 | $64.78 | -56.4% | $9.7M |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions0
—
Added to0
—
Trimmed6
- Izzy Englander (Millennium Mgmt)−82,740$1.9M
- Ken Griffin (Citadel Advisors)−53,849$1.2M
- Mario Gabelli (GAMCO)−25,506$582K
- D.E. Shaw & Co.−14,303$326K
- Renaissance Technologies−1,973$45K
- T. Rowe Price−1,300$30
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 6 | $2.34B |
| 2022Q2 | 7 | $113.5M |
| 2022Q3 | 8 | $90.8M |
| 2022Q4 | 7 | $106.0M |
| 2023Q1 | 7 | $93.4M |
| 2023Q2 | 5 | $80.8M |
| 2023Q3 | 6 | $67.9M |
| 2023Q4 | 5 | $88.0M |
| 2024Q1 | 7 | $78.7M |
| 2024Q2 | 10 | $55.3M |
| 2024Q3 | 8 | $42.8M |
| 2024Q4 | 8 | $23.8M |
| 2025Q1 | 7 | $24.1M |
| 2025Q2 | 6 | $18.6M |
| 2025Q3 | 6 | $16.3M |
| 2025Q4 | 6 | $20.7M |
Who owns ATNI
6 super-investors · 2025Q4
Tracked stake
906.4K
shares
Combined value
$21M
% of shares outstanding
—
shares-out unknown
Quarter action mix
Trim6
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | D.E. Shaw & Co. | 412.5K | $9M |
| 2 | Renaissance Technologies | 344.1K | $8M |
| 3 | Izzy Englander Millennium Mgmt | 70.3K | $2M |
| 4 | Mario Gabelli GAMCO | 51.4K | $1M |
| 5 | Ken Griffin Citadel Advisors | 16.5K | $375K |
| 6 | T. Rowe Price | 11.7K | $266K |
Recent moves
20 transactions
- TRIMT. Rowe Price−1,300 · 2025Q4
- TRIMD.E. Shaw & Co.−14,303 · 2025Q4
- −53,849 · 2025Q4
- −82,740 · 2025Q4
- −1,973 · 2025Q4
- −25,506 · 2025Q4
- +12,882 · 2025Q3
- TRIMD.E. Shaw & Co.−6,223 · 2025Q3
- +648 · 2025Q3
- −17,800 · 2025Q3
- +6,715 · 2025Q3
- TRIMT. Rowe Price−123 · 2025Q2
- −22,584 · 2025Q2
- +6,482 · 2025Q2
- TRIMD.E. Shaw & Co.−4,421 · 2025Q2
- −3,900 · 2025Q2
- +10,253 · 2025Q2
- −99,973 · 2025Q1
- −42,360 · 2025Q1
- +4,732 · 2025Q1
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