Portolan Capital Management, LLC
Position in AMSC — American Superconductor Corp /De/
CIK 1350290
BOSTON, MA
Position in AMSC
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$1,216,824
-$8,790,454 QoQ
Shares Held
29,314
-90.1% QoQ
Ownership
0.061%
of shares outstanding
% of Portfolio
0.05%
of 13F equity value
Holder Rank
#97
of 276 holders
Holding Since
Dec 2020
3 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in AMSC Over Time
Shares Held
Position Value (USD)
Position in Specialty Industrial Machinery
Industrials · as of Jun 30, 2026Portolan Capital Management, LLC holds $87,688,206 across 6 Specialty Industrial Machinery names. AMSC ranks #6 (1.4% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | RRX |
Regal Rexnord Corp
|
137,498 | $32,750,648 | |
| 2 | GTES |
Gates Industrial Corp Ltd.
|
641,587 | $17,945,188 | |
| 3 | GHM |
Graham Corp
|
136,925 | $16,949,945 | |
| 4 | CXT |
Crane NXT, Co.
|
271,524 | $13,891,167 | |
| 5 | GNRC |
Generac Holdings Inc.
|
16,852 | $4,934,434 | |
| 6 | AMSC |
American Superconductor Corp /De/
This page
|
29,314 | $1,216,824 |
All Filings in AMSC
Export CSV
3 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $1,216,824 | 29,314 | Shares | Sole | 2026-08-14 | |
| 2026-03-31 | $10,007,278 | 295,636 | Shares | Sole | 2026-05-15 | |
| 2020-12-31 | $3,909,617 | 166,935 | Shares | Sole | 2021-02-16 | |
| No filing history on record for this holder in this stock. | ||||||