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Amercn Supercond (AMSC)
NASDAQ
$42.11-$3.22 (-7.10%)
Price as of Jun 23, 2026 5:57 PM EDT- $2.2BMarket Cap
- 39.81%1-Year Change
- Specialty Industrial MachineryIndustry
Amercn Supercond (AMSC)
$42.11-$3.22 (-7.10%)
Top Holders
Institutional
Mutual Funds
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
BLACKROCK, INC. | 8.35% | 4.0M | +232,247 (+5.83%) | Mar 31, 2026 |
VANGUARD GROUP INC | 7.39% | 3.5M | +576,831 (+16.36%) | Dec 31, 2025 |
BLACKROCK FUNDING, INC. /DE | 7.19% | 3.4M | +707,110 (+20.63%) | Dec 31, 2024 |
BLACKROCK INC. | 5.33% | 2.5M | +1.8M (+70.67%) | Jun 30, 2024 |
N/A | 4.28% | 2.0M | +2.0M (+100.00%) | Mar 31, 2026 |
BAILLIE GIFFORD & CO | 3.03% | 1.4M | -59,422 (-4.11%) | Mar 31, 2026 |
STATE STREET CORP | 2.64% | 1.3M | +68,978 (+5.47%) | Mar 31, 2026 |
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
VANGUARD INDEX FUNDS | 4.18% | 2.0M | +142,373 (+7.14%) | Mar 31, 2026 |
iSHARES TRUST | 3.55% | 1.7M | +44,172 (+2.61%) | Mar 31, 2026 |
OBERWEIS FUNDS | 1.70% | 812,700 | 0 (0.00%) | Mar 31, 2026 |
VANGUARD HORIZON FUNDS | 1.60% | 762,777 | +301,765 (+39.56%) | Mar 31, 2026 |
TIAA-CREF FUNDS | 1.15% | 547,772 | -1,162 (-0.21%) | Jan 31, 2026 |
Capitol Series Trust | 1.07% | 510,000 | 0 (0.00%) | Jan 31, 2026 |
FIRST TRUST EXCHANGE-TRADED FUND II | 1.06% | 505,041 | +134,658 (+26.66%) | Mar 31, 2026 |
Current Ownership Distribution
- Institutions394.1M (77.14%)
- Mutual Funds113.7M (22.26%)
- Insiders3.1M (0.60%)
- Other0 (0.00%)
Insider Transactions
- 0.60% (3.1M)Current InsiderOwnership (%, shares)
- 0Number of InsiderBuying (last 12 months)
- $0.00Amount of InsiderBuying (last 12 months)
- 5Number of InsiderSelling (last 12 months)
- $262.9MAmount of InsiderSelling (last 12 months)
Insider Name & Title | Type | Date
| Transaction Value | Shares | Share Price | Shares After Transactions |
|---|---|---|---|---|---|---|
Dambier Laura A. | Sell | Jun 11, 2026 | $150,520.00 | 4,000 | $37.63 | 14,992 |
McGahn Daniel P Chairman, President and CEO | Sell | Jun 08, 2026 | $206,614.39 | 4,992 | $41.39 | 1.2M |
McGahn Daniel P Chairman, President and CEO | Sell | Jun 08, 2026 | $197,381.19 | 4,678 | $42.19 | 1.1M |
Littlefield Barbara G. | Award | Apr 03, 2026 | $0.00 | 3,116 | $0.00 | 35,427 |
Donnelly Terence Robert | Award | Apr 03, 2026 | $0.00 | 2,665 | $0.00 | 2,665 |
House Arthur H | Award | Apr 03, 2026 | $0.00 | 3,116 | $0.00 | 51,779 |
OLIVER DAVID R JR | Award | Apr 03, 2026 | $0.00 | 3,116 | $0.00 | 63,823 |
Dambier Laura A. | Award | Apr 03, 2026 | $0.00 | 3,116 | $0.00 | 18,992 |
OLIVER DAVID R JR | Sell | Feb 24, 2026 | $6,820.00 | 200 | $34.10 | 60,707 |
House Arthur H | Sell | Aug 08, 2025 | $494,081.61 | 9,703 | $50.92 | 48,663 |
House Arthur H | Exempt | Aug 06, 2025 | $0.00 | 9,703 | $0.00 | 0 |
House Arthur H | Exempt | Aug 06, 2025 | $65,980.40 | 9,703 | $6.80 | 58,366 |
McGahn Daniel P Chairman, President and CEO | Sell | Aug 04, 2025 | $4.0M | 73,105 | $54.26 | 1.2M |
Kosiba John W JR SVP, CFO & Treasurer | Sell | Aug 04, 2025 | $1.9M | 34,260 | $54.34 | 368,630 |
McGahn Daniel P Chairman, President and CEO | Sell | Aug 04, 2025 | $1.5M | 27,743 | $55.11 | 1.2M |
Kosiba John W JR SVP, CFO & Treasurer | Sell | Aug 04, 2025 | $867,733.61 | 15,740 | $55.13 | 352,890 |
Kosiba John W JR SVP, CFO & Treasurer | Sell | Aug 04, 2025 | $543,924.18 | 9,843 | $55.26 | 0 |
McGahn Daniel P Chairman, President and CEO | Sell | Jun 11, 2025 | $351,696.70 | 12,315 | $28.56 | 1.3M |
McGahn Daniel P Chairman, President and CEO | Sell | Jun 11, 2025 | $14,545.00 | 500 | $29.09 | 1.3M |
McGahn Daniel P Chairman, President and CEO | Sell | Jun 06, 2025 | $244,670.13 | 7,689 | $31.82 | 1.3M |
McGahn Daniel P Chairman, President and CEO | Sell | May 27, 2025 | $626,052.33 | 24,506 | $25.55 | 1.4M |
Kosiba John W JR SVP, CFO & Treasurer | Sell | May 27, 2025 | $258,021.77 | 10,097 | $25.55 | 454,179 |
McGahn Daniel P Chairman, President and CEO | Sell | May 27, 2025 | $2.6M | 98,149 | $26.60 | 1.3M |
Donnelly Terence Robert | Award | May 27, 2025 | $0.00 | 2,112 | $0.00 | 2,112 |
Kosiba John W JR SVP, CFO & Treasurer | Sell | May 27, 2025 | $1.1M | 39,903 | $26.61 | 414,276 |
Kosiba John W JR SVP, CFO & Treasurer | Sell | May 20, 2025 | $290,529.68 | 11,860 | $24.50 | 464,276 |
McGahn Daniel P Chairman, President and CEO | Sell | May 20, 2025 | $313,877.79 | 12,815 | $24.49 | 1.4M |
House Arthur H | Award | Apr 03, 2025 | $0.00 | 2,639 | $0.00 | 48,663 |
Dambier Laura A. | Award | Apr 03, 2025 | $0.00 | 2,639 | $0.00 | 15,876 |
Littlefield Barbara G. | Award | Apr 03, 2025 | $0.00 | 2,639 | $0.00 | 32,311 |