American Superconductor Corporation (AMSC)
Nasdaq: AMSC · Motors & Generators · Devens, MA · filing with the SEC since 1996
Grade6.5
◀ Past 6.1● Present 6.3▶ Future 7.3
Who owns American Superconductor Corporation
As filed with the SECHolders of 5% or more
1
Blackrock, Inc. holds 7.1% of Common Stock, as its SCHEDULE 13G/A filed Apr 17, 2025 says.
Directors and officers
8
report now, of 14 people on the record since 2006. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 1 named at left.
Holders of 5% or moreshare of the class, as filed
Blackrock, Inc.
SCHEDULE 13G/A · filed Apr 17, 2025 · Common Stock · 8.7% in Feb 5, 2025
Vanguard Capital Management
SCHEDULE 13G/A · filed Jul 31, 2026 · Common Stock · reported falling below 5%, from 5% in Apr 29, 2026
Baillie Gifford & Co
SCHEDULE 13G/A · filed Feb 12, 2025 · Ordinary Shares · reported falling below 5%, from 5.5% in Nov 4, 2024
The Vanguard Group
SCHEDULE 13G/A · filed Mar 26, 2026 · Common Stock · reported falling below 5%, from 7.4% in Jan 30, 2026
What AMSC reports owning in othersstakes of 5% or more, and other ties
Other ties the annual report names
Comtrafo Industria de Transformadores Eletricos S.A. (Comtrafo)
A company bought · acquisition · Dec 2025 · owns, named in the 10-K filed May 27, 2026
Megatran Acquisition
A company bought · acquisition · Jul 2024 · owns, named in the 10-K filed May 27, 2026
Megatran
A company bought · acquisition · owns, named in the 10-K filed May 27, 2026
NWL Pacific Inc. Co., LTD
A company bought · acquisition, investee · owns, named in the 10-K filed May 27, 2026
16 subsidiaries in 9 countries, from the list filed with the 10-K filed May 27, 2026.
Insider tradesForm 4
25sales
0purchases
23sales on a scheduled plan
4people selling
$7.8Msold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Sep 30, 2025 to Sep 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Sep 30, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window4 of 14 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Mcgahn Daniel P | Chairman, President and CEO | 12 | $5.3M | 12 | 0 | $0 |
| Kosiba John W Jr | SVP, CFO & Treasurer | 11 | $2.3M | 11 | 0 | $0 |
| Dambier Laura A. | director | 1 | $200,000 | 0 | 0 | $0 |
| Oliver David R Jr | director | 1 | $0 | 0 | 0 | $0 |