Ticker · CUSIP 45113Y203
Holders (tracked)
3
Combined shares
123,595
Combined value
$213.8K
Last close
—
Quarter
2025Q4
Tracked holders · last 8 quarters
Flat over the last 8 quarters.
SEC event timeline
5 events
- Ken Griffin (Citadel Advisors) trimmed2026-02-17−12,651 shares · 2025Q4Position
- Two Sigma Investments trimmed2026-02-17−1,111 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) added2026-02-17+31,932 shares · 2025Q4Position
- +29,166 shares · 2025Q3Position
- Two Sigma Investments opened position2025-11-14+12,613 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions0
—
Added to1
- Izzy Englander (Millennium Mgmt)+31,932$55K
Trimmed2
- Ken Griffin (Citadel Advisors)−12,651$22K
- Two Sigma Investments−1,111$2K
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q4 | 3 | $232K |
| 2023Q1 | 4 | $89K |
| 2023Q2 | 5 | $17K |
| 2023Q3 | 2 | $131 |
| 2023Q4 | 4 | $41K |
| 2024Q1 | 1 | $43 |
| 2024Q2 | 1 | $38K |
| 2024Q3 | 1 | $53K |
| 2024Q4 | 2 | $325K |
| 2025Q2 | 1 | $231K |
| 2025Q3 | 3 | $353K |
| 2025Q4 | 3 | $214K |
Who owns AMBR
3 super-investors · 2025Q4
Tracked stake
123.6K
shares
Combined value
$214K
% of shares outstanding
—
shares-out unknown
Quarter action mix
Added1Trim2
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Izzy Englander Millennium Mgmt | 61.1K | $106K |
| 2 | Ken Griffin Citadel Advisors | 51.0K | $88K |
| 3 | Two Sigma Investments | 11.5K | $20K |
Recent moves
19 transactions
- −12,651 · 2025Q4
- −1,111 · 2025Q4
- +31,932 · 2025Q4
- +29,166 · 2025Q3
- +12,613 · 2025Q3
- −22,500 · 2025Q1
- +22,500 · 2024Q4
- SOLDBlackRock−11 · 2024Q2
- −38,143 · 2024Q1
- TRIMBlackRock−12 · 2024Q1
- TRIMBlackRock−13 · 2023Q4
- −17,460 · 2023Q3
- −9,300 · 2023Q2
- +15,700 · 2023Q1
- TRIMBlackRock−27 · 2023Q1
- −60,241 · 2023Q1
- NEWBlackRock+63 · 2022Q4
- +60,241 · 2022Q4
- +49,203 · 2022Q4
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