AMSC · Insider trading · 13F holders · Congress trades
American Superconductor Corp (AMSC)
Who is buying and selling AMSC: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 14
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 0
AMSC at a glance
- No open-market insider purchases or sales of AMSC were filed in the last 90 days.
- 14 13F filers hold AMSC among their 50 largest positions, worth $164.1M combined. The biggest bets by portfolio weight are AWM Investment Company, Inc. (3.4%), Palisades Investment Partners, LLC (1.9%) and Telemark Asset Management, LLC (1.8%). In their latest 13Fs, 0 managers opened a new position and 3 added to one.
- No member of Congress has disclosed a trade in AMSC.
AMSC insider trading
No open-market insider purchases or sales of AMSC were filed in the last 90 days.
Who owns AMSC? Hedge funds and superinvestors
14 13F filers hold AMSC among their 50 largest positions, worth $164.1M combined. The biggest bets by portfolio weight are AWM Investment Company, Inc. (3.4%), Palisades Investment Partners, LLC (1.9%) and Telemark Asset Management, LLC (1.8%). In their latest 13Fs, 0 managers opened a new position and 3 added to one.
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Oberweis Asset Management Inc/Mutual fund manager | 0.8% | $41.0M | 987,500 | +16.2% shares | Q2 2026 |
| AWM Investment Company, Inc.Hedge fund | 3.4% | $39.5M | 951,604 | +18.7% shares | Q2 2026 |
| Telemark Asset Management, LLCHedge fund | 1.8% | $24.9M | 600,000 | +0.0% shares | Q2 2026 |
| Ranger Investment Management, L.P.Institutional asset manager | 1.1% | $16.8M | 405,266 | — | Q2 2026 |
| Beau Ventures, LLcWealth manager | 1.0% | $11.1M | 380,893 | -0.0% shares | Q3 2026 |
| Brown Capital Management LLCMutual fund manager | 1.3% | $7.0M | 239,521 | +251.4% shares | Q3 2026 |
| Palisades Investment Partners, LLCInstitutional asset manager | 1.9% | $6.5M | 156,720 | +2.7% shares | Q2 2026 |
| Essex Investment Management Co LLCAsset manager | 0.9% | $6.0M | 205,382 | -7.5% shares | Q3 2026 |
| GMT Capital CorpHedge fund | 0.2% | $4.5M | 108,066 | +0.0% shares | Q2 2026 |
| Lumbard & Kellner, LLCWealth manager | 0.9% | $3.1M | 74,139 | +0.6% shares | Q2 2026 |
| Covestor LtdWealth manager | 1.0% | $1.7M | 41,348 | — | Q2 2026 |
| Virtus Advisers, LLCAsset manager | 0.5% | $1.2M | 28,501 | +3.8% shares | Q2 2026 |
| nVerses Capital, LLCHedge fund | 0.8% | $494K | 11,909 | — | Q2 2026 |
| Morgan Dempsey Capital Management LLCWealth manager | 0.2% | $366K | 8,819 | +3.6% shares | Q2 2026 |
Each manager counts with its latest 13F (Q3 2026: 3, Q2 2026: 11). Screen AMSC in the grand portfolio →
AMSC stock trades by members of Congress
No member of Congress has disclosed a trade in AMSC.
AMSC questions and answers
Are insiders buying AMSC stock?
No open-market insider purchases or sales of AMSC were filed in the last 90 days.
Which hedge funds own AMSC?
14 13F filers hold AMSC among their 50 largest positions, worth $164.1M combined. The biggest bets by portfolio weight are AWM Investment Company, Inc. (3.4%), Palisades Investment Partners, LLC (1.9%) and Telemark Asset Management, LLC (1.8%). In their latest 13Fs, 0 managers opened a new position and 3 added to one.
Has Congress traded AMSC?
No member of Congress has disclosed a trade in AMSC.
Who is the largest holder of AMSC?
Among 13F filers, Oberweis Asset Management Inc/ reports the largest AMSC position, $41.0M (987,500 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is AWM Investment Company, Inc.'s: 3.4% of its portfolio.
Cite or share this
Free to use with a link back. The data updates every filing day.