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RHUMBLINE ADVISERS

Position in AMSC — American Superconductor Corp /De/

CIK 1115418 BOSTON, MA

Position in AMSC

as of Jun 30, 2026 · filed Aug 12, 2026
Position Value
$2,638,873
+$618,604 QoQ
Shares Held
63,572
+6.5% QoQ
Ownership
0.131%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#70
of 276 holders
Holding Since
Mar 2020
22 quarters on record
Voting authority Sole 27% Shared 0% None 73%

Common Shares in AMSC Over Time

Shares Held

Position Value (USD)

Position in Specialty Industrial Machinery

Industrials · as of Jun 30, 2026

RHUMBLINE ADVISERS holds $2,495,931,332 across 55 Specialty Industrial Machinery names. AMSC ranks #42 (0.1% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in AMSC

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22 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $2,638,873 63,572
2026-03-31 $2,020,269 59,683
2025-12-31 $1,660,404 57,693
2025-09-30 $4,182,540 70,425
2025-06-30 $2,244,033 61,162
2025-03-31 $891,998 49,173
2024-12-31 $1,259,060 51,119
2024-09-30 $1,192,106 50,513
2024-06-30 $1,082,395 46,276
2024-03-31 $18,751 1,388
2023-12-31 $15,462 1,388
2023-09-30 $10,479 1,388
2023-06-30 $8,688 1,388
2022-03-31 $272,133 35,760
2021-12-31 $390,243 35,868
2021-09-30 $532,505 36,523
2021-06-30 $611,136 35,143
2021-03-31 $713,711 37,643
2020-12-31 $906,728 38,716
2020-09-30 $415,431 28,690
2020-06-30 $214,412 26,373
2020-03-31 $124,417 22,704