Ticker · CUSIP 030111207
Holders (tracked)
16
Combined shares
4,349,158
Combined value
$125.17M
Last close
$39.72
Quarter
2025Q4
Price · 1Y$39.72+21.31 (+115.75%)H $66.68 · L $17.52 · Avg Vol 1.1M
Tracked holders · last 8 quarters
+3 vs previous quarter over the last 8.
Price is +38.0% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
21 events
- Ken Griffin (Citadel Advisors) added2026-02-17+322,892 shares · 2025Q4Position
- D.E. Shaw & Co. trimmed2026-02-17−309,555 shares · 2025Q4Position
- Two Sigma Investments added2026-02-17+199,948 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−44,414 shares · 2025Q4Position
- Steve Cohen (Point72) added2026-02-17+44,234 shares · 2025Q4Position
- T. Rowe Price trimmed2026-02-17−121,488 shares · 2025Q4Position
- +251,642 shares · 2025Q4Position
- Wellington Management exited2026-02-17−399,246 shares · 2025Q4Position
- AQR Capital Management trimmed2026-02-17−22,786 shares · 2025Q4Position
- Renaissance Technologies trimmed2026-02-12−184,000 shares · 2025Q4Position
- Baillie Gifford & Co added2026-01-23+79,509 shares · 2025Q4Position
- −260,121 shares · 2025Q3Position
- Two Sigma Investments trimmed2025-11-14−1,227 shares · 2025Q3Position
- Izzy Englander (Millennium Mgmt) trimmed2025-11-14−129,305 shares · 2025Q3Position
- Wellington Management trimmed2025-11-14−32,343 shares · 2025Q3Position
- AQR Capital Management trimmed2025-11-14−139 shares · 2025Q3Position
- Steve Cohen (Point72) trimmed2025-11-14−12,436 shares · 2025Q3Position
- D.E. Shaw & Co. added2025-11-14+619,059 shares · 2025Q3Position
- T. Rowe Price added2025-11-14+368,479 shares · 2025Q3Position
- Renaissance Technologies opened position2025-11-13+323,989 shares · 2025Q3Position
- Baillie Gifford & Co trimmed2025-10-31−25,347 shares · 2025Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of AMSC…
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 |
|---|---|---|---|---|
| Baillie Gifford & Co | 2020Q3 | $15.77 | +151.9% | $59.9M |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $19.15 | +107.4% | $3.1M |
| AQR Capital Management | 2019Q3 | $23.66 | +67.9% | $5.8M |
| Steve Cohen (Point72) | 2023Q2 | $25.32 | +56.9% | $1.3M |
| Steve Cohen (Point72) | 2023Q2 | $25.32 | +56.9% | $1.3M |
| Paul Tudor Jones (Tudor Investment) | 2024Q2 | $28.83 | +37.8% | $10.0M |
| Paul Tudor Jones (Tudor Investment) | 2024Q2 | $28.83 | +37.8% | $10.0M |
| Paul Tudor Jones (Tudor Investment) | 2024Q2 | $28.83 | +37.8% | $10.0M |
| Two Sigma Investments | 2017Q1 | $28.87 | +37.6% | $12.8M |
| D.E. Shaw & Co. | 2017Q2 | $35.15 | +13.0% | $17.6M |
| D.E. Shaw & Co. | 2017Q2 | $35.15 | +13.0% | $17.6M |
| Renaissance Technologies | 2016Q1 | $37.51 | +5.9% | $5.6M |
| Ken Griffin (Citadel Advisors) | 2016Q3 | $40.42 | -1.7% | $13.4M |
| Ken Griffin (Citadel Advisors) | 2016Q3 | $40.42 | -1.7% | $13.4M |
| Ken Griffin (Citadel Advisors) | 2016Q3 | $40.42 | -1.7% | $13.4M |
| T. Rowe Price | 2021Q4 | $56.48 | -29.7% | $10.9M |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions1
- Paul Tudor Jones (Tudor Investment)+251,642$7.2M
Added to4
- Ken Griffin (Citadel Advisors)+322,892$9.3M
- Two Sigma Investments+199,948$5.8M
- Baillie Gifford & Co+79,509$2.3M
- Steve Cohen (Point72)+44,234$1.3M
Trimmed5
- D.E. Shaw & Co.−309,555$8.9M
- Renaissance Technologies−184,000$5.3M
- Izzy Englander (Millennium Mgmt)−44,414$1.3M
- AQR Capital Management−22,786$656K
- T. Rowe Price−121,488$3K
Exited1
- Wellington Management−399,246$23.7M
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 7 | $32.2M |
| 2022Q2 | 10 | $17.8M |
| 2022Q3 | 8 | $13.3M |
| 2022Q4 | 9 | $10.3M |
| 2023Q1 | 9 | $12.5M |
| 2023Q2 | 11 | $17.9M |
| 2023Q3 | 9 | $26.9M |
| 2023Q4 | 8 | $40.4M |
| 2024Q1 | 10 | $60.7M |
| 2024Q2 | 13 | $159.6M |
| 2024Q3 | 11 | $86.0M |
| 2024Q4 | 11 | $80.7M |
| 2025Q1 | 14 | $60.1M |
| 2025Q2 | 15 | $148.8M |
| 2025Q3 | 13 | $251.3M |
| 2025Q4 | 16 | $125.2M |
Who owns AMSC
16 super-investors · 2025Q4
Tracked stake
4.35M
shares
Combined value
$125M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New3Added7Trim6
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Baillie Gifford & Co | 1.51M | $43M |
| 2 | D.E. Shaw & Co. | 443.1K | $13M |
| 3 | Ken Griffin Citadel Advisors | 337.7K | $10M |
| 4 | Two Sigma Investments | 321.6K | $9M |
| 5 | Ken Griffin Citadel Advisors | 320.6K | $9M |
| 6 | Ken Griffin Citadel Advisors | 282.4K | $8M |
| 7 | T. Rowe Price | 274.8K | $8M |
| 8 | Paul Tudor Jones Tudor Investment | 251.6K | $7M |
| 9 | AQR Capital Management | 146.0K | $4M |
| 10 | Renaissance Technologies | 140.0K | $4M |
| 11 | D.E. Shaw & Co. | 95.8K | $3M |
| 12 | Izzy Englander Millennium Mgmt | 78.1K | $2M |
| 13 | Steve Cohen Point72 | 77.5K | $2M |
| 14 | Steve Cohen Point72 | 33.1K | $953K |
| 15 | Paul Tudor Jones Tudor Investment | 32.0K | $921K |
| 16 | Paul Tudor Jones Tudor Investment | 8.0K | $230K |
Recent moves
20 transactions
- +251,642 · 2025Q4
- −22,786 · 2025Q4
- +322,892 · 2025Q4
- −399,246 · 2025Q4
- +199,948 · 2025Q4
- −44,414 · 2025Q4
- TRIMT. Rowe Price−121,488 · 2025Q4
- TRIMD.E. Shaw & Co.−309,555 · 2025Q4
- +44,234 · 2025Q4
- −184,000 · 2025Q4
- +79,509 · 2025Q4
- −260,121 · 2025Q3
- −12,436 · 2025Q3
- +368,479 · 2025Q3
- +619,059 · 2025Q3
- −129,305 · 2025Q3
- −32,343 · 2025Q3
- −1,227 · 2025Q3
- −139 · 2025Q3
- +323,989 · 2025Q3
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