Ticker · CUSIP 03211Q200
Holders (tracked)
4
Combined shares
604,678
Combined value
$1.81M
Last close
$2.04
Quarter
2025Q4
Price · 1Y$2.04+0.50 (+32.47%)H $4.73 · L $1.47 · Avg Vol 594K
Position opened
Tracked holders · last 8 quarters
+2 vs previous quarter over the last 8.
Price is -31.8% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
6 events
- +318,000 shares · 2025Q4Position
- Two Sigma Investments added2026-02-17+85,283 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−6,033 shares · 2025Q4Position
- Renaissance Technologies opened position2026-02-12+158,200 shares · 2025Q4Position
- +18,697 shares · 2025Q3Position
- Two Sigma Investments added2025-11-14+9,570 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of AMPG…
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 Griffin (Citadel Advisors) | 2023Q1 | $2.89 | -29.4% | $649K |
| Two Sigma Investments | 2025Q2 | $2.91 | -29.8% | $236K |
| Renaissance Technologies | 2021Q2 | $2.98 | -31.6% | $323K |
| Izzy Englander (Millennium Mgmt) | 2021Q2 | $4.57 | -55.4% | $26K |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions2
- Ken Griffin (Citadel Advisors)+318,000$951K
- Renaissance Technologies+158,200$473K
Added to1
- Two Sigma Investments+85,283$255K
Trimmed1
- Izzy Englander (Millennium Mgmt)−6,033$18K
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2021Q2 | 3 | $852K |
| 2021Q3 | 2 | $442K |
| 2021Q4 | 1 | $784K |
| 2022Q1 | 2 | $137K |
| 2022Q2 | 1 | $35K |
| 2023Q1 | 1 | $57K |
| 2023Q2 | 3 | $400K |
| 2023Q3 | 3 | $292K |
| 2023Q4 | 3 | $212K |
| 2024Q1 | 3 | $189K |
| 2024Q2 | 3 | $146K |
| 2024Q3 | 2 | $34K |
| 2024Q4 | 1 | $60K |
| 2025Q2 | 1 | $44K |
| 2025Q3 | 2 | $191K |
| 2025Q4 | 4 | $1.8M |
Who owns AMPG
4 super-investors · 2025Q4
Tracked stake
604.7K
shares
Combined value
$2M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New2Added1Trim1
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Ken Griffin Citadel Advisors | 318.0K | $951K |
| 2 | Renaissance Technologies | 158.2K | $473K |
| 3 | Two Sigma Investments | 115.8K | $346K |
| 4 | Izzy Englander Millennium Mgmt | 12.7K | $38K |
Recent moves
20 transactions
- +318,000 · 2025Q4
- +85,283 · 2025Q4
- −6,033 · 2025Q4
- +158,200 · 2025Q4
- +9,570 · 2025Q3
- +18,697 · 2025Q3
- +20,961 · 2025Q2
- −11,600 · 2025Q1
- −11,347 · 2024Q4
- −11,253 · 2024Q3
- TRIMBlackRock−8,246 · 2024Q2
- −23,600 · 2024Q2
- −13,285 · 2024Q1
- TRIMBlackRock−372 · 2024Q1
- −9,745 · 2023Q4
- TRIMBlackRock−186 · 2023Q4
- −15,449 · 2023Q3
- TRIMBlackRock−651 · 2023Q3
- NEWBlackRock+16,586 · 2023Q2
- +96,279 · 2023Q2
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