Ticker · CUSIP 002121101
Holders (tracked)
11
Combined shares
7,341,880
Combined value
$129.88M
Last close
$27.55
Quarter
2025Q4
Price · 1Y$27.55+12.01 (+77.26%)H $27.55 · L $15.10 · Avg Vol 808K
Tracked holders · last 8 quarters
-1 vs previous quarter over the last 8.
Price is +55.7% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
23 events
- AQR Capital Management trimmed2026-02-17−3,852 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) added2026-02-17+67,227 shares · 2025Q4Position
- T. Rowe Price trimmed2026-02-17−36,437 shares · 2025Q4Position
- Wellington Management trimmed2026-02-17−34,146 shares · 2025Q4Position
- +370,444 shares · 2025Q4Position
- Ken Griffin (Citadel Advisors) trimmed2026-02-17−198,777 shares · 2025Q4Position
- Two Sigma Investments added2026-02-17+50,488 shares · 2025Q4Position
- D.E. Shaw & Co. exited2026-02-17−14,242 shares · 2025Q4Position
- Renaissance Technologies trimmed2026-02-12−252,053 shares · 2025Q4Position
- Norges Bank (Norway SWF) opened position2026-02-10+26,272 shares · 2025Q4Position
- Ken Fisher (Fisher Asset Mgmt) added2026-02-09+4,875 shares · 2025Q4Position
- Mario Gabelli (GAMCO) added2026-02-05+750 shares · 2025Q4Position
- −404,209 shares · 2025Q3Position
- AQR Capital Management added2025-11-14+377 shares · 2025Q3Position
- Two Sigma Investments added2025-11-14+110,082 shares · 2025Q3Position
- D.E. Shaw & Co. trimmed2025-11-14−7,098 shares · 2025Q3Position
- T. Rowe Price added2025-11-14+68,210 shares · 2025Q3Position
- Wellington Management added2025-11-14+588,922 shares · 2025Q3Position
- Izzy Englander (Millennium Mgmt) added2025-11-14+51,718 shares · 2025Q3Position
- Renaissance Technologies trimmed2025-11-13−113,119 shares · 2025Q3Position
- Norges Bank (Norway SWF) exited2025-11-13−26,272 shares · 2025Q3Position
- Mario Gabelli (GAMCO) trimmed2025-11-12−2,000 shares · 2025Q3Position
- Ken Fisher (Fisher Asset Mgmt) trimmed2025-11-12−5,258 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of ATEN…
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) | 2020Q1 | $6.81 | +304.8% | $1.2M |
| Renaissance Technologies | 2016Q1 | $9.94 | +177.2% | $58.8M |
| T. Rowe Price | 2016Q4 | $13.89 | +98.3% | $42.3M |
| Ken Fisher (Fisher Asset Mgmt) | 2022Q2 | $14.36 | +91.8% | $2.1M |
| Paul Tudor Jones (Tudor Investment) | 2016Q3 | $14.76 | +86.6% | $10.2M |
| AQR Capital Management | 2016Q1 | $15.66 | +75.9% | $1.1M |
| Norges Bank (Norway SWF) | 2022Q4 | $16.13 | +70.8% | $724K |
| Two Sigma Investments | 2016Q1 | $16.21 | +70.0% | $20.2M |
| Wellington Management | 2016Q3 | $17.30 | +59.2% | $55.7M |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $17.48 | +57.6% | $5.8M |
| Ken Griffin (Citadel Advisors) | 2016Q1 | $17.73 | +55.4% | $4.2M |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions2
- Paul Tudor Jones (Tudor Investment)+370,444$6.6M
- Norges Bank (Norway SWF)+26,272$465K
Added to4
- Izzy Englander (Millennium Mgmt)+67,227$1.2M
- Two Sigma Investments+50,488$893K
- Ken Fisher (Fisher Asset Mgmt)+4,875$86K
- Mario Gabelli (GAMCO)+750$13K
Trimmed5
- Renaissance Technologies−252,053$4.5M
- Ken Griffin (Citadel Advisors)−198,777$3.5M
- Wellington Management−34,146$604K
- AQR Capital Management−3,852$68K
- T. Rowe Price−36,437$645
Exited1
- D.E. Shaw & Co.−14,242$258K
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 12 | $146.3M |
| 2022Q2 | 12 | $207.8M |
| 2022Q3 | 12 | $223.3M |
| 2022Q4 | 14 | $289.9M |
| 2023Q1 | 13 | $260.5M |
| 2023Q2 | 12 | $249.2M |
| 2023Q3 | 10 | $256.2M |
| 2023Q4 | 10 | $230.5M |
| 2024Q1 | 10 | $229.7M |
| 2024Q2 | 13 | $258.3M |
| 2024Q3 | 11 | $71.7M |
| 2024Q4 | 13 | $97.5M |
| 2025Q1 | 12 | $108.2M |
| 2025Q2 | 13 | $135.1M |
| 2025Q3 | 12 | $134.1M |
| 2025Q4 | 11 | $129.9M |
Who owns ATEN
11 super-investors · 2025Q4
Tracked stake
7.34M
shares
Combined value
$130M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New2Added4Trim5
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Renaissance Technologies | 2.13M | $38M |
| 2 | Wellington Management | 2.02M | $36M |
| 3 | T. Rowe Price | 1.54M | $27M |
| 4 | Two Sigma Investments | 733.7K | $13M |
| 5 | Paul Tudor Jones Tudor Investment | 370.4K | $7M |
| 6 | Izzy Englander Millennium Mgmt | 212.1K | $4M |
| 7 | Ken Griffin Citadel Advisors | 152.0K | $3M |
| 8 | Ken Fisher Fisher Asset Mgmt | 74.6K | $1M |
| 9 | Mario Gabelli GAMCO | 42.8K | $756K |
| 10 | AQR Capital Management | 38.6K | $683K |
| 11 | Norges Bank Norway SWF | 26.3K | $465K |
Recent moves
20 transactions
- −34,146 · 2025Q4
- +67,227 · 2025Q4
- −3,852 · 2025Q4
- +370,444 · 2025Q4
- +50,488 · 2025Q4
- TRIMT. Rowe Price−36,437 · 2025Q4
- SOLDD.E. Shaw & Co.−14,242 · 2025Q4
- −198,777 · 2025Q4
- −252,053 · 2025Q4
- +26,272 · 2025Q4
- +4,875 · 2025Q4
- +750 · 2025Q4
- −404,209 · 2025Q3
- +51,718 · 2025Q3
- TRIMD.E. Shaw & Co.−7,098 · 2025Q3
- +68,210 · 2025Q3
- +110,082 · 2025Q3
- +588,922 · 2025Q3
- +377 · 2025Q3
- −113,119 · 2025Q3
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