Ticker · CUSIP 00507W206
Holders (tracked)
5
Combined shares
1,327,071
Combined value
$1.80M
Last close
—
Quarter
2025Q4
Tracked holders · last 8 quarters
-1 vs previous quarter over the last 8.
SEC event timeline
10 events
- Ken Griffin (Citadel Advisors) exited2026-02-17−126,615 shares · 2025Q413F
- Two Sigma Investments trimmed2026-02-17−24,601 shares · 2025Q413F
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−23,097 shares · 2025Q413F
- Steve Cohen (Point72) opened position2026-02-17+10,295 shares · 2025Q413F
- AQR Capital Management exited2026-02-17−16,805 shares · 2025Q413F
- Renaissance Technologies added2026-02-12+102,154 shares · 2025Q413F
- Izzy Englander (Millennium Mgmt) trimmed2025-11-14−38,572 shares · 2025Q313F
- AQR Capital Management trimmed2025-11-14−60,414 shares · 2025Q313F
- Two Sigma Investments added2025-11-14+187,748 shares · 2025Q313F
- Renaissance Technologies added2025-11-13+79,129 shares · 2025Q313F
Insider activity
No insider transactions in the last 30 days.
Who moved on this name in 2025Q4
13F transactions reported for the latest quarter, grouped by direction.
New positions1
- Steve Cohen (Point72)+10,295$14K
Added to1
- Renaissance Technologies+102,154$139K
Trimmed2
- Two Sigma Investments−24,601$33K
- Izzy Englander (Millennium Mgmt)−23,097$31K
Exited2
- Ken Griffin (Citadel Advisors)−126,615$203K
- AQR Capital Management−16,805$27K
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 5 | $4.3M |
| 2022Q2 | 8 | $3.4M |
| 2022Q3 | 8 | $5K |
| 2022Q4 | 8 | $13.3M |
| 2023Q1 | 8 | $7.7M |
| 2023Q2 | 7 | $15.1M |
| 2023Q3 | 5 | $11.5M |
| 2023Q4 | 4 | $9.0M |
| 2024Q1 | 5 | $15.2M |
| 2024Q2 | 7 | $15.3M |
| 2024Q3 | 7 | $1.5M |
| 2024Q4 | 6 | $472K |
| 2025Q1 | 5 | $271K |
| 2025Q2 | 6 | $1.5M |
| 2025Q3 | 6 | $2.1M |
| 2025Q4 | 5 | $1.8M |
Who owns ATNM
5 super-investors · 2025Q4
Tracked stake
1.33M
shares
Combined value
$2M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New1Added1Trim2Sold1
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Izzy Englander Millennium Mgmt | 601.6K | $818K |
| 2 | Renaissance Technologies | 390.8K | $531K |
| 3 | Two Sigma Investments | 209.7K | $285K |
| 4 | Ken Griffin Citadel Advisors | 114.7K | $156K |
| 5 | Steve Cohen Point72 | 10.3K | $14K |
Recent moves
20 transactions
- −126,615 · 2025Q4
- −23,097 · 2025Q4
- −16,805 · 2025Q4
- −24,601 · 2025Q4
- +10,295 · 2025Q4
- +102,154 · 2025Q4
- −38,572 · 2025Q3
- +187,748 · 2025Q3
- −60,414 · 2025Q3
- +79,129 · 2025Q3
- +13,970 · 2025Q2
- +663,269 · 2025Q2
- +46,545 · 2025Q2
- SOLDT. Rowe Price−12,785 · 2025Q2
- +151,901 · 2025Q2
- −117,454 · 2025Q1
- +46,545 · 2025Q1
- +12,785 · 2025Q1
- −132,800 · 2025Q1
- −59,608 · 2024Q4
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