WELLINGTON MANAGEMENT GROUP LLP
Position in AMSC — American Superconductor Corp /De/
CIK 902219
Boston, MA
Position in AMSC
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$3,538,478
-$20,172,740 QoQ
Shares Held
85,244
-78.6% QoQ
Ownership
0.176%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#61
of 276 holders
Holding Since
Dec 2024
5 quarters on record
Voting authority
Sole 0%
Shared 67%
None 33%
Common Shares in AMSC Over Time
Shares Held
Position Value (USD)
Position in Specialty Industrial Machinery
Industrials · as of Jun 30, 2026WELLINGTON MANAGEMENT GROUP LLP holds $8,649,039,471 across 31 Specialty Industrial Machinery names. AMSC ranks #27 (0.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ETN |
Eaton Corp plc
|
6,827,266 | $2,909,234,585 | |
| 2 | EMR |
Emerson Electric Co
|
8,464,091 | $1,211,634,624 | |
| 3 | AME |
Ametek Inc/
|
2,994,077 | $724,386,987 | |
| 4 | PH |
Parker-Hannifin Corp
|
681,600 | $666,686,587 | |
| 5 | RRX |
Regal Rexnord Corp
|
2,584,056 | $615,496,293 | |
| 6 | GEV |
GE Vernova Inc.
|
383,942 | $451,078,096 | |
| 7 | DOV |
DOVER Corp
|
1,740,986 | $390,468,338 | |
| 8 | CMI |
Cummins Inc
|
495,047 | $353,072,470 |
All Filings in AMSC
Export CSV
5 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $3,538,478 | 85,244 | Shares | Defined | 2026-08-14 | |
| 2025-09-30 | $23,711,218 | 399,246 | Shares | Defined | 2025-11-14 | |
| 2025-06-30 | $15,834,999 | 431,589 | Shares | Defined | 2025-08-14 | |
| 2025-03-31 | $5,245,596 | 289,173 | Shares | Defined | 2025-05-13 | |
| 2024-12-31 | $11,360,093 | 461,230 | Shares | Defined | 2025-02-12 | |
| No filing history on record for this holder in this stock. | ||||||